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Sample records for circumferential thoracolumbar corrective

  1. Minimal Invasive Circumferential Management of Thoracolumbar Spine Fractures

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    S. Pesenti

    2015-01-01

    Full Text Available Introduction. While thoracolumbar fractures are common lesions, no strong consensus is available at the moment. Objectives. The aim of this study was to evaluate the results of a minimal invasive strategy using percutaneous instrumentation and anterior approach in the management of thoracolumbar unstable fractures. Methods. 39 patients were included in this retrospective study. Radiologic evaluation was based on vertebral and regional kyphosis, vertebral body height restoration, and fusion rate. Clinical evaluation was based on Visual Analogic Score (VAS. All evaluations were done preoperatively and at 1-year follow-up. Results. Both vertebral and regional kyphoses were significantly improved on postoperative evaluation (13° and 7° versus −1° and −9°  P<0.05, resp. as well as vertebral body height (0.92 versus 1.16, P<0.05. At 1-year follow-up, mean loss of correction was 1°. A solid fusion was visible in all the cases, and mean VAS was significantly reduced form 8/10 preoperatively to 1/10 at the last follow-up. Conclusion. Management of thoracolumbar fractures using percutaneous osteosynthesis and minimal invasive anterior approach (telescopic vertebral body prosthesis is a valuable strategy. Results of this strategy offer satisfactory and stable results in time.

  2. Early posterior spinal canal decompression and circumferential reconstruction of rotationally unstable thoracolumbar burst fractures with neurological deficit

    Institute of Scientific and Technical Information of China (English)

    ZHENG Guo-quan; WANG Yan; TANG Pei-fu; ZHANG Yong-gang; ZHANG Xue-song; GUO Yi-zhu; TAO Sheng

    2013-01-01

    Background Among the various treatments of neurologically involved unstable thoracolumbar burst fractures,the combination of anterior and posterior instrumentation provides the most stable reconstruction.However,the use of both approaches on a trauma patient may increase the morbidity.This study is a retrospective matched cohort study to evaluate the advantages of a single stage posterior approach for spinal canal decompression in combination with circumferential reconstruction by comparing the clinical and radiographic results.Methods From March 2005 to September 2009,patients with matched type spinal fracture,ages at surgery,and involved levels in our institute underwent either a single stage posterior approach (group one,n=12) or traditional combined approach (group two,n=14) for spinal canal decompression and circumferential reconstruction were reviewed.Pre-and post-operative X-ray films were reviewed and changes in Cobb angle of thoracolumbar spine were documented.Intra-operative,post-operative,and general complications were registered.Results The mean follow-up was (27.7±9.6) months (range,14 to 56 months) in group one and (29.2±7.4) months (range,20 to 60 months) in group two (P >0.05).The mean operation time was 214 minutes (range,186-327 minutes) in group one and 284 minutes (range,219-423 minutes) in group two (P <0.05).The average volume of intraoperative blood loss was 1856 ml (range,1250-3480 ml) in group one and 2453 ml (range,1600-3680 ml) in group two (P <0.05).There was no statistical difference between the groups one and two in average vertebral body height loss at the injured level and the average Cobb angle in sagittal plane before and immediately after surgery.Postoperatively,there was an epidural hematoma in one patient in group one and two patients in group two.Bony union after stabilization was obtained in all patients,without loosening or breakage of screws.Loss of correction (5°) was seen in 1 patient in group one at the 6th month

  3. Prediction of Deformity Correction by Pedicle Screw Instrumentation in Thoracolumbar Scoliosis Surgery

    Science.gov (United States)

    Kiriyama, Yoshimori; Yamazaki, Nobutoshi; Nagura, Takeo; Matsumoto, Morio; Chiba, Kazuhiro; Toyama, Yoshiaki

    In segmental pedicle screw instrumentation, the relationship between the combinations of pedicle screw placements and the degree of deformity correction was investigated with a three-dimensional rigid body and spring model. The virtual thoracolumbar scoliosis (Cobb’s angle of 47 deg.) was corrected using six different combinations of pedicle-screw placements. As a result, better correction in the axial rotation was obtained with the pedicle screws placed at or close to the apical vertebra than with the screws placed close to the end vertebrae, while the correction in the frontal plane was better with the screws close to the end vertebrae than with those close to the apical vertebra. Additionally, two screws placed in the convex side above and below the apical vertebra provided better correction than two screws placed in the concave side. Effective deformity corrections of scoliosis were obtained with the proper combinations of pedicle screw placements.

  4. The height of the osteotomy and the correction of the kyphotic angle in thoracolumbar kyphosis

    Institute of Scientific and Technical Information of China (English)

    HAO Chou-kuan; LI Wei-shi; CHEN Zhong-qiang

    2008-01-01

    Background This study investigated the relationship between the height of osteotomy and the correction of the kyphotic angle during posterior closing wedge osteotmy with instrumentation and the spinal osteotomy with cage inserting into the intervertebral gap and closing posteriorly by a single posterior approach in thoracolumbar kyphosis, and using this relationship as the basis of the preoperative design.Methods From April 1996 to June 2007, 30 thoracolumbar kyphosis patients with complete medical records and clear X-ray photograms have undergone operation. Of these 30 cases, 16 cases underwent posterior closing wedge osteotmywith instrumentation while the height of the osteotomy and the correction of the angle have been measured; 14 casesunderwent spinal osteotomy with cage inserting into the intervertebral gap and closing posteriorly by a single posteriorapproach while the height of the osteotomy, the height and the place of the cage and the correction of the angle were also measured. A simple geometrical model was simulated to calculate the relationship between the height of the osteotomy and the correction of the angle and these results are finally compared with the data coming from the actual measuring by the Wilcoxon statistic method.Results The distribution of data from the 16 cases by posterior closing wedge osteotomy with instrumentation was as such: 9 male and 7 female, the mean age was 49.2 years (range 38-70), the kyphosis improved from an average of 30° (range 15°-45°) preoperatively to 4° (range -26°-30°) postoperatively, the kyphosis was corrected on average 2.5° per 1 mm in the height of the osteotomy. The results from the simple geometrical model were that the mean of the correction of the angle per 1 mm was 2.2°. As a result, there was no significant difference (P >0.05) when comparing the measurement collected with the result simulated from the geometric model. The distribution of data from the 14 cases by spinal osteotomy with cage

  5. Sextant percutaneous pedicle screw fixation for correcting single-segment thoracolumbar fractures

    Institute of Scientific and Technical Information of China (English)

    Ming Jiang-hua; Zheng Hui-feng; Zhao Qi; Chen Qing; Wang Gang

    2014-01-01

    BACKGROUND:Though the effects of conservative or traditional open reduction and internal fixation in the treatment of thoracolumbar fractures are reliable and satisfactory for most cases, two methods also have shortages. Minimal-invasive percutaneous pedicle screw system provides a new available method. OBJECTIVE:To investigate the clinical effect of Sextant percutaneous pedicle screw system in the treatment of thoracolumbar fractures. METHODS:A total of 55 patients, who had undergone percutaneous pedicle screw fixation using Sextant system (25 patients) or traditional open internal fixation (30 patients) for single-level vertebral body compression fractures in Department of Orthopedics of Renmin Hospital of Wuhan University from February 2011 to January 2013, were enrol ed in this study. RESULTS AND CONCLUSION:Except two patients in traditional open internal fixation group were lost after discharge, al other patients were fol owed up for 8-14 months. Operative time, intraoperative blood loss, postoperative drainage amount and hospital day were better in percutaneous pedicle screw fixation group than in the traditional open internal fixation group (P0.05). The results show that percutaneous pedicle screw fixation using Sextant system has a satisfactory outcome in the treatment of thoracolumbar fractures. However, obeying indication strictly is very important for clinical application.

  6. 双椎体截骨术矫正强直性脊柱炎重度胸腰椎后凸畸形%Two-level pedicle subtraction osteotomy for correction of severe thoracolumbar kyphosis due to ankylosing spondylitis

    Institute of Scientific and Technical Information of China (English)

    陈志明; 杨滨; 马华松; 王晓平; 谭荣; 陈阳; 袁伟

    2014-01-01

    Objectives: To analyze the clinical results of two-level pedicle subtraction osteotomy for correc-tion of severe thoracolumbar kyphosis due to ankylosing spondylitis. Methods: From May 2009 to December 2010, 18 males with ankylosing spondylitis complicated with severe thoracolumbar kyphosis underwent two-level pedicle subtraction osteotomy, the average age at admission was 34.8 years(range, 19-47 years). Preoper-ative global kyphosis(GK) Cobb angle was 70°-108°(82.6°±17.5°) and the apex vertebra was at thoracolumbar region. Preoperative thoracic kyphosis(TK), thoracolumbar kyphosis(TLK) and lumbar lordosis(LL) angle was 46 °-67°(55.2°±15.3°), 25°-43°(32.4°±12.6°) and (-37°)-(-11°)[(-19.5°)±10.3°], respectively. Preoperative chin-brow vertical angle at standing position was 43°-130°(67.2°±21.9°). Global sagittal imbalance was determined by C7 plumb line and its relationship with the posterior superior corner of the sacrum, and the preoperative one was 11-35cm(18.3±14.8cm). Bridwell-Dewald scale was used to evaluate the clinical outcomes. Results: The aver-age operation time was 5.3±1.0h (3.7-6.9h), and the average blood loss was 1887.5±850.9ml (600-3000ml). Dura matter tearing was noted in 4 cases and skin infection in 1 case, 1 case developed transient neurologic deficits, but all healed after proper intervention. The average follow-up time was 33.5 months(24-48 months). The postoperative mean GK angle, chin-brow vertical angle, global sagittal imbalance was corrected to 21.3 °±4.2°, 9.3°±12.8° and 3.0±4.7cm, respectively. The postoperative GK, TK, TLK, LL, chin-brow vertical angle and global sagittal imbalance improved significantly compared with the preoperative data(P0.05). Instrument displacement was not noted at final follow-up. All patients could walk with normal vision. Satisfactory clinical outcomes including changes of pain, social and working status were noted at final follow-up(P0.05);X线片显示所有患者内

  7. Coronal decompensation after three-column osteotomy correction for congenital thoracolumbar kyphoscoliosis%先天性胸腰段侧后凸畸形三柱截骨矫形术后冠状面失代偿

    Institute of Scientific and Technical Information of China (English)

    孙旭; 钱邦平; 邱勇; 徐磊磊; 陈忠辉; 朱泽章; 王斌; 俞杨; 朱锋

    2014-01-01

    目的 探讨先天性胸腰段侧后凸畸形三柱截骨矫形术后冠状面失代偿的发生机制.方法 2008年1月至2012年6月因先天性胸腰段侧后凸畸形接受三柱截骨矫形术治疗的患者118例,男55例,女63例;年龄10~30岁,平均18岁.冠状面平衡类型:Ⅰ型(平衡状态),C7偏移小于2 cm;Ⅱ型(凸侧失平衡),C7向主弯凸侧偏移大于2 cm;Ⅲ型(凹侧失平衡),C7向主弯凹侧偏移大于2 cm.Ⅱ型和Ⅲ型为冠状面失平衡.结果 术后胸腰段侧凸和后凸均获得满意矫正.冠状面C7偏移从术前平均1.1 cm增加至术后1.5 cm.术前冠状面平衡Ⅰ型71例、Ⅱ型45例、Ⅲ型2例;术后Ⅰ型92例、Ⅱ型26例.26例(22%,26/118)有冠状面失代偿,且均为凸侧失平衡.术后Ⅱ型患者较Ⅰ型有较大的C7偏移(3.1 cm比0.2 cm)和C7偏移变化量(1.8 cm比-0.8 cm);术前Ⅱ型患者较Ⅰ型有更高的术后凸侧失平衡发生率(33%比15%).远端固定于L5及骶骨者冠状面失平衡发生率高于固定于L4及以上者(36%比14%).术后失代偿与术前C7偏移呈正相关(r=0.31,P=0.047).22例在术后1年内凸侧失代偿改善.结论 顶椎区三柱截骨矫形术可有效矫正先天性胸腰段侧后凸畸形,但术后易发冠状面失代偿.术后冠状面失代偿可能与截骨矫形和术前凸侧失平衡有关.%Objective To investigate the pathomechanism of the coronal decompensation after three-column osteotomy correction for congenital thoracolumbar kyphoscoliosis.Methods The present study reviewed 118 patients with congenital thoracolumbar kyphoscoliosis who were treated with three-column osteotomy correction between January 2008 and June 2012.There were 55 males and 63 females.Balance in the coronal plane was categorized into three types according to C7 translation (C7T,defined as the shift of the center of C7 vertebra as to the center sacral vertical line):Type Ⅰ,balanced; Type Ⅱ,coronal imbalance on the convex side (C7T≥2 cm); and Type

  8. Surgical treatment in thoraco-lumbar region fractures.

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    Jorge Alberto Jerez Labrada

    2008-08-01

    Full Text Available Background: thoraco-lumbar fractures may affect people at any moment of their lives, especially at their most fruitful and useful stage. Its correct diagnosis and treatment may directly influence in the posterior evolution of the patients. Objectives: to evaluate the results of the surgical treatment in thoraco-lumbar region fractures. Methods: a descriptive retrospective correlational study of series cases which included 54 patients attended due to thoraco-lumbar region fractures in the University Hospital “Dr. Gustavo Aldereguía Lima” in Cienfuegos city, Cuba from January 1999 to June 2007. Age, sex, etiology of the fracture, type and level of the fractures, associated diseases, surgical techniques used for, pre and post operatory neurological damage, usage of metilprednisolone, complications and final results were the variables taken into consideration in this study. Results: most of the patients belonged to male sex under the age of 45. The totality of the cases had type IV fracture, and a great part of them had Denis type II fracture having surgical treatment. The causes of the lesions were traffic accidents, working accidents and height falls. The most useful surgical techniques were posterior decompression, instrumentation and fusion. Surgery improved the neurological damage in almost half of sick patients with this condition. Complications were minimum and rupture of the implant was predominant. Conclusion: surgical treatment in thoraco-lumbar region fractures had satisfactory results in our milieu.

  9. Endoscopic treatment of spinal trauma at the thoracolumbar junction

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    Beisse Rudolf

    2007-01-01

    Full Text Available Attempts of treating unstable fractures of the thoracolumbar junction by posterior reduction and fixation alone often result in a significant loss of correction, especially in lesions where a severe destruction of the vertebral body and the intervertebral disc is present. The conventional open approaches like classic thoraco-phreno-lumbotomy produces additional iatrogenic trauma at the lateral chest and abdominal wall which not rarely lead to intercostal neuralgia, as well as post-thoracotomy syndromes. The endoscopic trans-diaphragmatic approach described below opens up the whole thoracolumbar junction to a minimally invasive procedure allowing one to perform all the procedures needed for a full reconstruction of the anterior column of the spine like corpectomy, decompression, vertebral body replacement and anterior plating. The key to address also the subdia-phragmal and retroperitoneal section of the thoracolumbar junction is a partial detachment of the diaphragm which runs along the attachment at the spine and the ribs. The technique was published first in 1998 and has been used now in 650 endoscopic procedures at the thoracolumbar junction out of a total of more than 1300 thoracoscopic operations of the spine in the BG Unfallklinik Murnau, Germany since 1996.

  10. 强直性脊柱炎胸腰段后凸畸形矫形设计的关键问题%Key points in the design of deformity correction of thoracolumbar kyphosis with ankylosing spondylitis

    Institute of Scientific and Technical Information of China (English)

    张永刚

    2014-01-01

    For patients of thoracolumbar kyphosis with ankylosing spondylitis ( AS ), it is signiifcant to reconstruct the sagittal balance and the chin-brow vertical angle by spinal osteotomy. Relocation of the center of gravity to pelvic neutral positional line is the key to reconstruct sagittal balance. In addition, chin-brow vertical angle is also important for patients with cervical ankylosis. Better outcomes depend on the selection of optimal osteotomy level.

  11. Management of thoracolumbar spine trauma An overview

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    S Rajasekaran

    2015-01-01

    Full Text Available Thoracolumbar spine fractures are common injuries that can result in significant disability, deformity and neurological deficit. Controversies exist regarding the appropriate radiological investigations, the indications for surgical management and the timing, approach and type of surgery. This review provides an overview of the epidemiology, biomechanical principles, radiological and clinical evaluation, classification and management principles. Literature review of all relevant articles published in PubMed covering thoracolumbar spine fractures with or without neurologic deficit was performed. The search terms used were thoracolumbar, thoracic, lumbar, fracture, trauma and management. All relevant articles and abstracts covering thoracolumbar spine fractures with and without neurologic deficit were reviewed. Biomechanically the thoracolumbar spine is predisposed to a higher incidence of spinal injuries. Computed tomography provides adequate bony detail for assessing spinal stability while magnetic resonance imaging shows injuries to soft tissues (posterior ligamentous complex [PLC] and neurological structures. Different classification systems exist and the most recent is the AO spine knowledge forum classification of thoracolumbar trauma. Treatment includes both nonoperative and operative methods and selected based on the degree of bony injury, neurological involvement, presence of associated injuries and the integrity of the PLC. Significant advances in imaging have helped in the better understanding of thoracolumbar fractures, including information on canal morphology and injury to soft tissue structures. The ideal classification that is simple, comprehensive and guides management is still elusive. Involvement of three columns, progressive neurological deficit, significant kyphosis and canal compromise with neurological deficit are accepted indications for surgical stabilization through anterior, posterior or combined approaches.

  12. Less invasive surgical treatment of traumatic thoracolumbar fractures

    NARCIS (Netherlands)

    Verlaan, J.J.

    2004-01-01

    Less invasive surgical treatment of traumatic thoracolumbar fractures. In this thesis various strategies were employed to evaluate the posibilities of reducing the invasiveness of the surgical treatment of traumatic thoracolumbar fractures. A systematic review of the literature suggested that adequ

  13. IMAGING DIAGNOSIS OF THORACOLUMBAR BURST FRACTURES

    Institute of Scientific and Technical Information of China (English)

    Li-yang Dai

    2004-01-01

    Objective To review imaging use in the diagnosis ofthoracolumbar burst fractures and to determine the diagnostic value of different imaging methods.Methods One hundred and fourteen patients with 120 thoracolumbar burst fractures were retrospectively reviewed. Plain radiographs were available in all cases; CT scans and MRI were obtained in 96 and 74 cases, respectively.Results A total of 27 burst fractures were misdiagnosed as other types of fractures on radiographs alone, and accounted for 22.5% of all fractures. The results indicated that plain radiographs often fail to delineate the pathological features of thoracolumbar burst fractures, leading to delay in diagnosis.Conclusion In regard to thoracolumbar injury diagnosis, burst fractures should be differentiated from compression fractures. CT should be routinely indicated and MRI examination, when necessary, may be simultaneously considered.

  14. A new brace treatment similar for adolescent scoliosis and kyphosis based on restoration of thoracolumbar lordosis. Radiological and subjective clinical results after at least one year of treatment

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    van Loon Piet JM

    2012-10-01

    Full Text Available Abstract Study design A prospective treatment study with a new brace was conducted Objective. To evaluate radiological and subjective clinical results after one year conservative brace treatment with pressure onto lordosis at the thoracolumbar joint in children with scoliosis and kyphosis. Summary of background data Conservative brace treatment of adolescent scoliosis is not proven to be effective in terms of lasting correction. Conservative treatment in kyphotic deformities may lead to satisfactory correction. None of the brace or casting techniques is based on sagittal forces only applied at the thoracolumbar spine (TLI= thoracolumbar lordotic intervention. Previously we showed in patients with scoliosis after forced lordosis at the thoracolumbar spine a radiological instantaneous reduction in both coronal curves of double major scoliosis. Methods A consecutive series of 91 children with adolescent scoliosis and kyphosis were treated with a modified symmetric 30 degrees Boston brace to ensure only forced lordosis at the thoracolumbar spine. Scoliosis was defined with a Cobb angle of at least one of the curves [greater than or equal to] 25 degrees and kyphosis with or without a curve Results Before treatment start ‘in brace’ radiographs showed a strong reduction of the Cobb angles in different curves in kyphosis and scoliosis groups (sagittal n = 5 all p Conclusion Conservative treatment using thoracolumbar lordotic intervention in scoliotic and kyphotic deformities in adolescence demonstrates a marked improvement after one year also in clinical and postural criteria. An effect not obtained with current brace techniques.

  15. Thoracolumbar spinal fractures : radiological results of transpedicular fixation combined with transpedicular cancellous bone graft and posterior fusion in 183 patients

    NARCIS (Netherlands)

    Leferink, VJM; Zimmerman, KW; Veldhuis, EFM; ten Vergert, EM; ten Duis, HJ

    2001-01-01

    In internal posterior fixation of thoracolumbar fractures combined with transpedicular cancellous bone graft and posterior fusion of the intervertebral facet joints at the level of the destroyed end plate it is still uncertain as to whether significant vertebral body collapse and loss of correction

  16. Management of flexion distraction injuries to the thoracolumbar spine.

    Science.gov (United States)

    Lopez, Alejandro J; Scheer, Justin K; Smith, Zachary A; Dahdaleh, Nader S

    2015-12-01

    We present an updated overview of the literature regarding the management of flexion distraction injuries (FDI). FDI are unstable fractures of the thoracolumbar spine, which require surgical management by long segment open fusion or minimally invasive posterior fixation with pedicle screws. While associated with concomitant intra-abdominal injuries that may delay operative stabilization, FDI frequently involve reversible spinal cord injuries and rapid correction is indicated. Modern biomechanical studies have identified valuable prognostic indicators that may be elucidated from determining the mechanism of injury, including the degree of flexion and presence of compression at the time of injury. An improved understanding of FDI will contribute to more appropriate diagnoses and treatment of these fractures.

  17. TREATMENT OF UNSTABLE THORACOLUMBAR FRACTURES IN PEDIATRIC PATIENTS

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    Roberto Chapa Sosa

    2015-09-01

    Full Text Available Objective:To analyze the characteristics of unstable thoracolumbar fractures in the pediatric population.Methods:A retrospective cross-sectional study was conducted with pediatric patients (0 to 15 years who presented with unstable thoracolumbar fracture with or without neurological damage. Twenty-four operated patients were analyzed: 13 male and 11 female.Results:Falls from height are the most common cause, being the thoracolumbar junction the anatomical site most frequently injured.Conclusion:The thoracolumbar fractures are rare in the pediatric population, as well as post-surgical instrumentation structural deformities.

  18. Review of 31 cases of anterior thoracolumbar fixation with the anterior thoracolumbar locking plate system.

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    Wilson, J A; Bowen, S; Branch, C L; Meredith, J W

    1999-07-15

    Anterior fixation devices for the thoracolumbar spine have gained wide acceptance as viable alternatives to long-segment posterior fixation in cases of thoracolumbar spine trauma. This review was undertaken to evaluate the safety and efficacy of the Synthes anterior thoracolumbar locking plate (ATLP) system. Over a 3-year period, 31 patients with unstable traumatic fractures of the thoracolumbar spine underwent corpectomy, placement of a structural bone graft, and anterior fixation in which the Synthes ATLP system was used. Long-term follow-up data were obtained in 29 patients. Two patients were lost to follow up, one at 4 months and the other at 1 year. In the remaining patients, the average length of follow up was 20 months. In all patients radiographic evidence of solid bone fusion was demonstrated on follow-up plain x-ray films, and there were no signs or symptoms of pseudarthrosis. No patient suffered neurological deterioration as a result of surgery, and there was relatively little morbidity associated with this plating system. To date, none of the patients in this study has developed any delayed complications related to the fixation device. In one patient, who had sustained a severe flexion injury, loosening of the anterior fixation device occurred, and the patient developed progressive kyphosis, which required a posterior stabilization procedure. These results appear slightly better than those obtained in published studies in which other anterior plating systems were used, indicating that this system is safe and effective in the treatment of unstable fractures of the thoracolumbar spine. PMID:16918232

  19. Postoperative Disc Wedging in Adolescent Idiopathic Thoracolumbar/Lumbar Scoliosis: a Comparison of Anterior and Posterior Approaches

    Institute of Scientific and Technical Information of China (English)

    Bin Yu; Yi-peng Wang; Gui-xing Qiu; Jian-guo Zhang; Jian-xiong Shen; Yu Zhao; Shu-gang Li; Qi-yi Li

    2010-01-01

    Objective To evaluate the different influences of anterior and posterior correction and fusion ap-proaches upon disc wedging in adolescent idiopathic thoracolumbar/lumbar scoliosis.Methods The retrospective study was conducted with the medical records and radiographs of ado-lescent idiopathic thoracolumbar/lumbar scoliosis patients that underwent anterior (group A) or posterior (group B) correction and fusion surgery from December 1998 to May 2008. The correction of the main curve and changes of the disc wedging were analyzed.Results Fifty-three patients were included, 26 in group A and 27 in group B. The mean coronal Cobb angles of the main curve in group A and group B were significantly corrected after surgery (P0.05). The difference between disc wedging at final follow-up and that after surgery was significant in group A (P0.05). Between the two groups, group A had larger disc angles after operation and at final follow-up (P<0.05), and a greater loss of disc angle (P<0.05).Conclusion For adolescent idiopathic thoracolumbar/lumbar scoliosis, posterior approach using all pedicle screws might produce a better result in terms of disc wedging compared with anterior approach.

  20. Correction.

    Science.gov (United States)

    2015-11-01

    In the article by Heuslein et al, which published online ahead of print on September 3, 2015 (DOI: 10.1161/ATVBAHA.115.305775), a correction was needed. Brett R. Blackman was added as the penultimate author of the article. The article has been corrected for publication in the November 2015 issue. PMID:26490278

  1. Thoracolumbar kyphoscoliosis with unilateral subluxation of the spine and postoperative lumbar spondylolisthesis in Hunter syndrome.

    Science.gov (United States)

    Roberts, Simon B; Tsirikos, Athanasios I

    2016-03-01

    Surgical correction for kyphoscoliosis is increasingly being performed for patients with mucopolysaccharidosis (MPS). Reported case series have predominantly included patients with Type I (Hurler) and Type IV (Morquio) MPS. To their knowledge, the authors describe the first case report of surgical management of thoracolumbar kyphoscoliosis in Hunter syndrome (MPS Type II) and the rare occurrence of lumbar spondylolisthesis following surgical stabilization. A 12-year-old boy with Hunter syndrome presented with severe thoracolumbar kyphoscoliosis and no associated symptoms. Spinal radiographs demonstrated kyphosis of 48° (T11-L3) and scoliosis of 22° (T11-L3) with an anteriorly hypoplastic L-1 vertebra. The deformity progressed to kyphosis of 60° and scoliosis of 42° prior to surgical intervention. Spinal CT scans identified left T12-L1 facet subluxation, causing anterior rotatory displacement of the spine proximal to L-1 and bilateral L-5 isthmic spondylolysis with no spondylolisthesis. A combined single-stage anterior and posterior instrumented spinal arthrodesis from T-9 to L-4 was performed. Kyphosis and scoliosis were corrected to 4° and 0°, respectively. Prolonged ventilator support and nasogastric feedings were required for 3 months postoperatively. At 2.5 years following surgery, the patient was asymptomatic, mobilizing independently, and had achieved a solid spinal fusion. However, he had also developed a Grade II spondylolisthesis at L4-5; this was managed nonoperatively in the absence of symptoms or further deterioration of the spondylolisthesis to the 3.5-year postoperative follow-up visit. Satisfactory correction of thoracolumbar kyphoscoliosis in Hunter syndrome can be achieved by combined anterior/posterior instrumented arthrodesis. The risk of developing deformity or instability in motion segments adjacent to an instrumented fusion may be greater in patients with MPS related to the underlying connective tissue disorder.

  2. 一期后路全脊椎切除治疗胸腰段结核僵硬性角状后凸畸形%One-stage posterior vertebral column resection to correct rigid and severe post-tubercular kyphotic deformities in thoracolumbar spine

    Institute of Scientific and Technical Information of China (English)

    曹奇; 廖雄; 杨铁军; 唐国军; 陈亮元; 陈小明; 唐晓军

    2011-01-01

    preoperative kyphosis was 49. 9° ± 12. 5° and in the immediate postoperative period was 18. 3° ±3. 4° with an average postoperative kyphosis correction of 31. 7° ±10. 9° and correction rate of 62. 8% ±5. 8% . Five cases with preoperative neurological dysfunction, Frankel's grade C in 3 patients and grade D in 2 patients, but only one case in grade D postoperative showed 80% neurologic improvement. Perioperative complications occurred respectively in 2 (16. 7% ) of the 12 patients including cerebrospinal fluids leakage and superficial infections. Looseness of fixation in one case (8. 3% ) was found postoperation. The mean VAS was 7. 8 and 2. 9 in pre- and post-operation showed 62. 3% improvement in back pain relief. Fusion of the resection site was confirmed on radiographs in all patients and no neural injury was found during follow-up. Conclusion A single-stage posterior-only vertebral resection is an effective and safe way to treat post-tubercular kyphotic deformities for the thoracolumbar spine.

  3. 49 CFR 178.345-7 - Circumferential reinforcements.

    Science.gov (United States)

    2010-10-01

    ... 49 Transportation 2 2010-10-01 2010-10-01 false Circumferential reinforcements. 178.345-7 Section... reinforcements. (a) A cargo tank with a shell thickness of less than 3/8 inch must be circumferentially... tank heads. (1) Circumferential reinforcement must be located so that the thickness and...

  4. Circumferential cracking of steam generator tubes

    Energy Technology Data Exchange (ETDEWEB)

    Karwoski, K.J.

    1997-04-01

    On April 28, 1995, the U.S. Nuclear Regulatory Commission (NRC) issued Generic Letter (GL) 95-03, {open_quote}Circumferential Cracking of Steam Generator Tubes.{close_quote} GL 95-03 was issued to obtain information needed to verify licensee compliance with existing regulatory requirements regarding the integrity of steam generator tubes in domestic pressurized-water reactors (PWRs). This report briefly describes the design and function of domestic steam generators and summarizes the staff`s assessment of the responses to GL 95-03. The report concludes with several observations related to steam generator operating experience. This report is intended to be representative of significant operating experience pertaining to circumferential cracking of steam generator tubes from April 1995 through December 1996. Operating experience prior to April 1995 is discussed throughout the report, as necessary, for completeness.

  5. Clinical study of a new approach to thoracolumbar surgery

    Institute of Scientific and Technical Information of China (English)

    LIU Gang; ZHAO Jian-ning; Akira Dezawa

    2008-01-01

    Objective: The conventional approaches for treatment of thoracolumbar diseases require extensive surgical exposure, often leading to postoperative pain and morbidity. Thoracoscopic-assisted surgery in these regions usually requires an extended recovery period due to the placement of drainage. We developed an innovative retro-peritoneal-extrapleural approach to thoracolumbar involvement by an extra-diaphragmatic technique using dedicated instruments. Neither incision nor reconstruction of the diaphragm was necessary. Exposure to the lateral part of the thoracolumbar vertebrae could be achieved without crus resection. This study is aimed to evaluate the clinical outcomes of this new surgical procedure. Methods: A total of 9 cases (5 cases of thoracolumbar fracture-dislocation, 1 each of spinal infection, tumor, thoracolumbar scoliosis and ossification of posterior longitudinal ligament) were subjected to the study. The average of the patients was 52.3 years. The results were com pared with the control group consisting of thoracoscopic surgery subgroup (5 patients, mean age 52.1 years) and conventional surgery subgroup (12 patients, mean age 61.3 years). Results: Compared with the control group, the average period of bed confinement and mean intra- and post-operative blood loss decreased significantly. Pulmonary complications were avoided in all cases. The surgical time was shortened, postoperative pain was reduced, and early postoperative ambulation became possible. Conclusion: The diaphragm-preserving retroperito-neal-extrapleural approach that we developed is a valid minimally invasive alternative for the treatment of thora-columbar diseases.

  6. Circumferential TIG welding of zircaloy flow tubes

    International Nuclear Information System (INIS)

    Reactivity control mechanism consists of 10 mtr. long zircaloy flow tubes (inner and outer) with components welded to hold the absorber elements. These components were welded by the plug welding process and supplied to Madras Atomic Power Station (MAPS) and Narora Atomic Power Station (NAPS). In view of the in-service problem faced in Rajasthan Atomic Power Station (RAPS), the spot welds were modified to circumferential TIG welding with additional reinforcement. Development work was taken up for additional reinforcement with screws and circumferential TIG welding of these assemblies. The additional reinforcement with screws and spot welds were critically examined and the job was taken up and successfully completed at Narora site for Narora Atomic Power Projects (NAPP-II). Several trials were conducted for circumferential TIG welding of zircaloy. Since zircaloy is highly reactive in nature, good shielding with inert gas should be ensured to avoid weld contamination due to oxygen and nitrogen. The strength, microstructural and radiographical requirements were examined with different parameters of welding such as weld current, feed, inert gas flow and weld configuration. The strength and other requirements were achieved meeting stringent specifications and assemblies for KAPP-I were successfully completed and despatched. (author). 7 figs

  7. Thoracolumbar Scoliosis Due to Cryptococcal Osteomyelitis

    Science.gov (United States)

    Li, Zheng; Liang, Jinqian; Shen, Jianxiong; Qiu, Guixing; Weng, Xisheng

    2016-01-01

    Abstract Cryptococcus neoformans causes opportunistic infections in immunocompromised patients, with vertebral osteomyelitis being a very rare involvement. This study is to present a case of thoracolumbar scoliosis occurring in the setting of cryptococcal osteomyelitis. Pharmacological intervention with anticryptococcal medicine and medical management of immune hemolytic anemia were administered. After initial acute stabilization, she underwent spinal debridement and fusion on October 29, 2008. She eventually recovered fully from this episode with no subsequent mechanical instability or neurological deficits on subsequent clinic follow-ups. To the best of our knowledge, there have been no reports describing the onset of spinal cryptococcal osteomyelitis along with immune hemolytic anemia. We suggest a comprehensive algorithm for the diagnosis of vertebral cryptococcal osteomyelitis. PMID:26844472

  8. Correction.

    Science.gov (United States)

    2016-02-01

    In the article by Guessous et al (Guessous I, Pruijm M, Ponte B, Ackermann D, Ehret G, Ansermot N, Vuistiner P, Staessen J, Gu Y, Paccaud F, Mohaupt M, Vogt B, Pechère-Bertschi A, Martin PY, Burnier M, Eap CB, Bochud M. Associations of ambulatory blood pressure with urinary caffeine and caffeine metabolite excretions. Hypertension. 2015;65:691–696. doi: 10.1161/HYPERTENSIONAHA.114.04512), which published online ahead of print December 8, 2014, and appeared in the March 2015 issue of the journal, a correction was needed.One of the author surnames was misspelled. Antoinette Pechère-Berstchi has been corrected to read Antoinette Pechère-Bertschi.The authors apologize for this error. PMID:26763012

  9. Unilateral posterior vertebral column resection for severe thoracolumbar kyphotic deformity caused by old compressive vertebrae fracture: a technical improvement.

    Science.gov (United States)

    Wang, Hui; Zhang, Di; Sun, Ya-Peng; Ma, Lei; Ding, Wen-Yuan; Shen, Yong; Zhang, Ying-Ze

    2015-01-01

    Severe thoracolumbar kyphotic deformity caused by old compressive vertebrae fracture remains a big challenge for spine surgeons. When symptoms related to significant deformities cannot be adequately managed conservatively, posterior vertebral column resection (PVCR) is required, but with long operating time and severe blood loss. We develop a UPVCR technique, which is done through a unilateral approach instead of a bilateral approach, vertebral body resection advancing to cross the midline in an abrasive way from an extreme oblique orientation enable the resection of most contralateral vertebral body. In the present study, the effects of UPVCR for severe thoracolumbar kyphotic deformity were investigated. We did find that satisfactory correction of sagittal deformity, functional improvement and pain relief can be achieved by UPVCR, and it has the advantage of shortening surgery time, reducing blood loss and incidence of nerve root impingement over PVCR.

  10. Correction

    CERN Multimedia

    2002-01-01

    The photo on the second page of the Bulletin n°48/2002, from 25 November 2002, illustrating the article «Spanish Visit to CERN» was published with a wrong caption. We would like to apologise for this mistake and so publish it again with the correct caption.   The Spanish delegation, accompanied by Spanish scientists at CERN, also visited the LHC superconducting magnet test hall (photo). From left to right: Felix Rodriguez Mateos of CERN LHC Division, Josep Piqué i Camps, Spanish Minister of Science and Technology, César Dopazo, Director-General of CIEMAT (Spanish Research Centre for Energy, Environment and Technology), Juan Antonio Rubio, ETT Division Leader at CERN, Manuel Aguilar-Benitez, Spanish Delegate to Council, Manuel Delfino, IT Division Leader at CERN, and Gonzalo León, Secretary-General of Scientific Policy to the Minister.

  11. Thoracolumbar fracture with listhesis - an uncommon manifestation of child abuse

    Energy Technology Data Exchange (ETDEWEB)

    Levin, Terry L.; Blitman, Netta M. [Department of Radiology, Montefiore Medical Center, 111 E. 210th Street, Bronx, New York, NY 10467-2490 (United States); Berdon, Walter E. [Department of Radiology, Babies Hospital, New York Presbyterian Hospital, New York (United States); Cassell, Ian [Department of Radiology, Phoenix Children' s Hospital, Phoenix, AZ (United States)

    2003-05-01

    Thoracolumbar fracture with listhesis (FL) is an uncommon manifestation of child abuse (increasingly known as nonaccidental trauma), with only six prior reports in the literature. This article seeks to call attention to FL of the thoracolumbar spine in abused children and infants. We reviewed plain films, CT and MR images in seven new cases of FL of the thoracolumbar spine in abused children ages 6 months to 7 years, two of whom became paraplegic from their injuries. Findings varied from subtle listhesis of one vertebra on another to frank vertebral dislocation, most commonly at L1/2. Paravertebral calcification was present in all but one case. In two children, thoracolumbar FL was the only radiographic sign of abuse. Radiographic findings of FL of the thoracolumbar spine may be subtle and may be erroneously interpreted as due to a congenital or neoplastic cause. While other signs of child abuse should be sought, spinal injury may be the sole sign of abuse. Recognition of this entity is important to pursue the diagnosis of abuse. (orig.)

  12. Thoracolumbar fracture with listhesis - an uncommon manifestation of child abuse

    International Nuclear Information System (INIS)

    Thoracolumbar fracture with listhesis (FL) is an uncommon manifestation of child abuse (increasingly known as nonaccidental trauma), with only six prior reports in the literature. This article seeks to call attention to FL of the thoracolumbar spine in abused children and infants. We reviewed plain films, CT and MR images in seven new cases of FL of the thoracolumbar spine in abused children ages 6 months to 7 years, two of whom became paraplegic from their injuries. Findings varied from subtle listhesis of one vertebra on another to frank vertebral dislocation, most commonly at L1/2. Paravertebral calcification was present in all but one case. In two children, thoracolumbar FL was the only radiographic sign of abuse. Radiographic findings of FL of the thoracolumbar spine may be subtle and may be erroneously interpreted as due to a congenital or neoplastic cause. While other signs of child abuse should be sought, spinal injury may be the sole sign of abuse. Recognition of this entity is important to pursue the diagnosis of abuse. (orig.)

  13. Short Segment Fixation Versus Short Segment Fixation With Pedicle Screws at the Fracture Level for Thoracolumbar Burst Fracture

    Directory of Open Access Journals (Sweden)

    Anghel S

    2014-04-01

    Full Text Available Objective: The most prevailing surgical procedure in the treatment of thoracolumbar burst fractures, Short Segment Fixation (SSF, is often followed by loss of correction or hardware failure which may be significant enough to require another surgical intervention. In order to take advantage of its benefits but to avoid or diminish the risk and impact of associated drawbacks, some other alternatives have been lately developed among which we refer to short segment fixation with intermediate screws (SSF+IS. This article provides a comparative picture over the effectiveness of the two above-mentioned surgical treatments, focusing on their potential to prevent the loss of correction.

  14. Transforaminal decompression and interbody fusion in the treatment of thoracolumbar fracture and dislocation with spinal cord injury.

    Directory of Open Access Journals (Sweden)

    Ai-Min Wu

    Full Text Available A retrospective clinical study.To evaluate the efficacy and safety of transforaminal decompression and interbody fusion in the treatment of thoracolumbar fracture and dislocation with spinal cord injury.Twenty-six spinal cord injured patients with thoracolumbar fracture and dislocation were treated by transforaminal decompression and interbody fusion. The operation time, intraoperative blood loss, and complications were recorded; the Cobb angle and compressive rate (CR of the anterior height of two adjacent vertebrae were measured; and the nerve injury was assessed according to sensory scores and motor scores of the American Spinal Injury Association (ASIA standards for neurological classification of spinal cord injury.The operative time was 250±57 min, and intraoperative blood loss was 440±168 ml. Cerebrospinal leakage was detected and repaired during the operation in two patients. A total of 24 of 26 patients were followed up for more than 2 years. ASIA sensory scores and motor scores were improved significantly at 3 months and 6 months after operation; the Cobb angle and CR of the anterior height of two adjacent vertebrae were corrected and showed a significant difference at post-operation; and the values were maintained at 3 months after operation and the last follow-up.We showed that transforaminal decompression together with interbody fusion is an alternative method to treat thoracolumbar fracture and dislocation.

  15. KumaFix fixation for thoracolumbar burst fractures: a prospective study on selective consecutive patients

    Institute of Scientific and Technical Information of China (English)

    Yan Liang; Guo Hua; Xu Zhengwei; Liu Tuanjiang; Wang Xiaodong; He Baorong; Hao Dingjun

    2014-01-01

    Background Short-segment U-shaped pedicle screw fixation has been widely used to treat thoracolumbar burst fracture.Some studies have reported the disadvantages of traditional U-shaped pedicle screw,which included a relatively high rate of adjacent segment degeneration and screw failure,including screw pullout and breakage.The purpose of this study was to assess the efficacy of open reduction and fixation using KumaFix fixation system in treatment of thoracolumbar burst fractures.Methods From June 2011 to June 2012,45 consecutive patients with thoracolumbar burst fractures were enrolled.They were randomly assigned to treatment with KumaFix (the treatment group,n=23) or traditional U-shaped pedicle screw (the control group,n=22).The patients were followed up postoperatively and were assessed with regard to radiologic and clinical outcomes.Radiologic outcomes were assessed mainly on the basis of Cobb angle and vertebral wedge angle.Clinical outcomes were evaluated mainly with use of Visual Analog Scale (VAS) for pain and the Oswestry Disability Index (ODI) Questionnaire.Results All patients were followed up from 9 to 22 months.There were no significant differences between the two groups with regard to preoperative indices.The operation time in the treatment group was significantly lower than that in the control group.Preoperative Cobb angles and vertebral wedge angles in two groups were significantly decreased after surgery,and these have been well maintained at the last follow-up with mild correction losses.The results of clinical outcome showed lower VAS and ODI scores in two groups compared with those preoperative,and the treatment group had greater improvement on the ODI compared with the control group at the last follow-up.Conclusions Compared with traditional U-shaped pedicle screw,KumaFix fixation system can achieve gradual,controlled reduction,provide enough space for bone implantation,and avoid acceleration of adjacent segment degeneration.It is an effective

  16. Is Circumferential Minimally Invasive Surgery Effective in the Treatment of Moderate Adult Idiopathic Scoliosis?

    OpenAIRE

    Anand, Neel; Baron, Eli M.; Khandehroo, Babak

    2014-01-01

    Background Outcomes for minimally invasive scoliosis correction surgery have been reported for mild adult scoliosis. Larger curves historically have been treated with open surgical procedures including facet resections or posterior column osteotomies, which have been associated with high-volume blood loss. Further, minimally invasive techniques have been largely reported in the setting of degenerative scoliosis. Questions/purposes We describe the effects of circumferential minimally invasive ...

  17. HISTOMORPHOLOGICAL STUDY OF THORACOLUMBAR FASCIA IN PATIENTS WITH LUMBOSACRAL DISCOPATHY

    Directory of Open Access Journals (Sweden)

    Z BEHDADIPOOR

    2000-03-01

    Full Text Available Introduction. Thoracolumbar fascia has neural ends in normal positions. It has sensory role and by inhibitory and or excitatory reflexes helps to protect vertebral column. In this research, it has been studied neural ends in thoracolumbar fascia in 42 cases. Our aim was to compare the presence of neural ends in normal individuals and those with lumbosacral discopathy. Methods. The samples were taken from one centimeter of midline at the level of L4-L5 vertebrae, since in this region the posterior layer of thoracolumbar fascia is thicker. Seven of the cases were normal and 35 were patients with lumbosacral discopathy. The samples were processed and serial sections were prepared. Six hundred and thirty sections from the serial sections were selected and 90 percent of these were stained with H&E and the rest of them were stained with Bielschowsky method. The sections were studied by light microscopy. Findings. Unlike the normal individuals, nerve corpuscles were not seen in none of our patients with lumbosacraldiscopathy.UsingBielschowsky,nerveendingswerepresentin normal individuals but they were not visible in patients with discopathy. Conclusion. It is concluded that thoracolumbar fascia in patients with discopathy had insufficient neural ends. Loss of these neural ends may be cause of decreasing proprioceptive information to nervous system and can be an initiating factor to damage the bones, ligaments and muscles.

  18. Complications of Thoracolumbar Stabilization and Instrumentation: A Pictorial Essay

    Directory of Open Access Journals (Sweden)

    Gh R Bahadorkhan

    2009-08-01

    Full Text Available In this pictorial essay, we intend to review the imaging findings of a series of patients who underwent thoracolumbar instrumentation and showed any kind of complication. Imaging of complicated cases could help surgeons find the most frequent defects of these procedures. In this article, we present 18 images of 150 patients who underwent spinal instrumentation in a 15-year period.

  19. Crack resistance of austenitic pipes with circumferential through-wall cracks

    International Nuclear Information System (INIS)

    For monotonously increasing load the correct evaluation of the crack resistance properties of a structure is essential for safety analyses. Considerable attention has been given to the through-wall case, since this is generally believed to be the controlling case with regard to complete pipe failure. The maximum load conditions for circumferential crack growth in pipes under displacement-controlled loadings has been determined. The need for crack resistance curves, measured on circumferentially through-wall cracked straight pipes of austenitic stainless steel 316L under bending, is emphasized by the limitation in the data range on small specimens and by the differences in the procedures. To answer open questions and to improve calculational methods a joint fracture mechanics program is being performed by Electricite de France, Novatome and Siemens-Interatom. The working program contains experimental and theoretical investigations on the applicability of small-specimen data to real structures. 10 refs., 10 figs., 4 tabs

  20. Classification-related approach in the surgical treatment of thoracolumbar fractures

    Directory of Open Access Journals (Sweden)

    Lukas R

    2007-01-01

    Full Text Available Background: Advanced diagnostic tools, classification systems and accordingly selected surgical approaches are essential requirements for the prevention of failure of surgical treatment of thoracolumbar fractures. The present study is designed to evaluate the contribution of classification to the choice of a surgical approach using the current fracture classification systems. Materials and Methods: We studied prospectively a group of 64 patients (22 females, 42 males of an average age of 43 years, all operated on for thoracolumbar fractures during the year 2001. The AO-ASIF classification was used preoperatively with all imaging studies (X-ray, computed tomography (CT and magnetic resonance imaging (MRI. When the damage was detected only in the anterior column (A type, an isolated anterior stabilization (n=22 was preferred. If the MRI study disclosed an injury in the posterior column, a posterior approach (n=20 using the internal fixator was chosen. Injuries involving the posterior column (B or C type were classified additionally according to the load-sharing classification (LSC. If LSC gave six or more points, treatment was completed with an anterior fusion.. The combined postero-anterior procedure was carried out 22 times.. The minimum follow-up period was 22 months. Results: Neither implant failure and nor significant loss of correction were observed in patients treated with anterior or combined procedures. The average loss of correction (increase of kyphosis in simple posterior stabilization was 3.1 degree. Conclusion: Complex fracture classification helps in the selection of the surgical approach and helps to decrease the chances of treatment failure.

  1. Effect of circumferential wave number on stability of suspension flow

    Directory of Open Access Journals (Sweden)

    Wang Feng-Hui

    2014-01-01

    Full Text Available The linear stability analysis is carried out for the suspension flow of spherical particles between a rotating inner cylinder and a stationary concentric outer cylinder. The mass conservation equation and Navier-Stokes equation are applied to the continuous fluid phase and the particle phase. Results of stability analysis show that the increase of wave number in the circumferential direction attenuates the effect of the axial wave number on the amplification factor. The ratio of particle density to fluid density increasing above 0.1 amplifies the flow instability, while it can be weakened with higher circumferential direction wave number. Effect of the critical Taylor number on the amplification factor is reduced by increasing the circumferential direction wave number. The flow stability is affected by the geometry of flow field (the radius ratio at non-zero circumferential direction wave numbers.

  2. Massive hematothorax after thoracic spinal manipulation for acute thoracolumbar pain

    Directory of Open Access Journals (Sweden)

    Johannes Struewer

    2013-07-01

    Full Text Available Spinal manipulation usually represents a widely used and effective method for physicians in order to relieve acute patient pain and muscular dysbalance. Although life-threatening complications (e.g. pneumothorax, vertebral artery dissection, stroke after manual treatment are reported with regard to actual medical literature millions of patients undergo manual treatment to manage thoracolumbar pain each year. The authors present the case of a 17 year old male patient with a life-threatening hematothorax after thoracic high velocity spinal manipulation for acute thoracolumbar pain. The patient required emergency chest tube thoracostomy and afterwards thoracoscopic haemostasis for an intercostal venous lesion. A massive hematothorax after spinal manipulation represents an extremely rare but life-threatening complication. Physicians are encouraged to promote the benefits of manual/chiropratic therapy on the one hand but on the other hand are obliged to educate about potential serious dangers and adverse events.

  3. Simultaneously anterior decompression and posterior instrumentation by extrapleural retroperitoneal approach in thoracolumbar lesions

    Directory of Open Access Journals (Sweden)

    Jain Anil

    2010-01-01

    Full Text Available Background: Anterior decompression with posterior instrumentation when indicated in thoracolumbar spinal lesions if performed simultaneously in single-stage expedites rehabilitation and recovery. Transthoracic, transdiaphragmatic approach to access the thoracolumbar junction is associated with significant morbidity, as it violates thoracic cavity; requires cutting of diaphragm and a separate approach, for posterior instrumentation. We evaluated the clinical outcome morbidity and feasibility of extrapleural retroperitoneal approach to perform anterior decompression and posterior instrumentation simultaneously by single "T" incision outcome in thoracolumbar spinal trauma and tuberculosis. Patients and Methods: Forty-eight cases of tubercular spine (n = 25 and fracture of the spine (n = 23 were included in the study of which 29 were male and 19 female. The mean age of patients was 29.1 years. All patients underwent single-stage anterior decompression, fusion, and posterior instrumentation (except two old traumatic cases via extrapleural retroperitoneal approach by single "T" incision. Tuberculosis cases were operated in lateral position as they were stabilized with Hartshill instrumentation. For traumatic spine initially posterior pedicle screw fixation was performed in prone position and then turned to right lateral position for anterior decompression by same incision and approach. They were evaluated for blood loss, duration of surgery, superficial and deep infection of incision site, flap necrosis, correction of the kyphotic deformity, and restoration of anterior and posterior vertebral body height. Results: In traumatic spine group the mean duration of surgery was 269 minutes (range 215-315 minutes including the change over time from prone to lateral position. The mean intraoperative blood loss was 918 ml (range 550-1100 ml. The preoperative mean ASIA motor, pin prick and light touch score improved from 63.3 to 74.4, 86 to 94.4 and 86 to 96 at

  4. Interobserver evaluation of TLICS system to treat thoracolumbar fractures

    Directory of Open Access Journals (Sweden)

    Bernardo José Moreira Chaves

    2015-06-01

    Full Text Available OBJECTIVE: To evaluate the interobserver agreement regarding the TLICS Classification (Thoracolumbar Injury Classification and Severity Score. Furthermore, evaluate the reliability, analyzing the correlation between the treatment indicated by TLICS system (surgical or conservative and the treatment indicated by each evaluator surgeon.METHODS: Imaging tests and clinical data of 22 patients with thoracolumbar fractures were analyzed by eight spine surgeons, and two main analyzes were performed: the first compared the interobserver agreement related to TLICS and the second compared the agreement between the treatment indicated by TLICS classification (surgical or conservative and treatment indicated by each surgeon - based on his personal experience and the preferred classification.RESULTS: Using the parameters of Landis and Koch for interpretation of Kappa value, the interobserver agreement of TLICS classification was considered moderate in our study (K=0.6. The agreement between the indications of treatment (surgical or conservative dictated by the classification and the indication of each surgeon was considered excellent, with kappa value of 0.89.CONCLUSION: We believe that the classification is a good tool for the evaluation and the treatment indication in thoracolumbar fractures.

  5. Thoracolumbar burst fracture: what the radiologist should know

    Energy Technology Data Exchange (ETDEWEB)

    Jacob Junior, Charbel; Batista, Priscila Rossi de; Machado, Igor Cardoso; Rezende, Rodrigo, E-mail: grupodecoluna@santacasavitoria.org [Santa Casa de Misericordia de Vitoria, Vitoria, ES (Brazil); Barbosa, Diogo Miranda; Vieira, Dimitri Mori [Centro de Diagnostico por Imagem, Vitoria, ES (Brazil)

    2012-03-15

    Thoracolumbar burst fractures are defined as those fractures involving compromise of the anterior, middle and posterior vertebral columns. The treatment for such vertebral fractures still remains undefined, raising questions about the best form of intervention in these cases. Because of these doubts, imaging methods play a key role in the preoperative workup. However, several tests and measurements are performed by spine surgeons before deciding on the best approach to be adopted, with no standardization and neither consensus. The present review was aimed at standardizing and describing the main techniques and radiological findings on the basis of instability criteria adopted by surgeons in the assessment of thoracolumbar burst fractures, namely extent of height loss of the anterior wall of the fractured vertebra, level of spinal canal compromise by bone fragments and degree of widening of interspinous and interpedicular distance. It is the authors' opinion that the standardization of the main measurements in the evaluation of thoracolumbar burst fractures by radiological methods will provide the information required for a better interpretation of tests results and consequently aiding in the decision making about the most appropriate treatment. (author)

  6. Clinical manifestations and significance of post-traumatic thoracolumbar syringomyelia

    Institute of Scientific and Technical Information of China (English)

    邱勇; 朱泽章; 吕锦瑜; 王斌; 李卫国; 朱丽华

    2004-01-01

    Objective: To analyze the pathogenic mechanism and the clinical significance of post-traumatic thoracolumbar syringomyelia through reviewing the clinical manifestations. Methods: The data of 15 patients (14 males and 1 female, aged from 28 to 56 years, with an average of 36 years) with post-traumatic syringomyelia treated in our hospital from December 1997 to February 2002 were studied retrospectively. Two patients suffered from T11 fractures, 7 from T12 fractures and 6 from L1 fractures. There were 12 patients with burst fractures and 3 with fracture dislocations. Anterior decompression, bone graft, bone fusion and internal fixation were made on 6 patients, posterior decompression, bone graft, bone fusion and internal fixation on 1 patient, and non-surgical treatment on 8 patients. Results: Syringomyelia of the patients was diagnosed accurately with magnetic resonance imaging at 0.5-4 years after the original thoracolumbar fracture. The cavern was round in 6 cases, elliptic in 6 cases, and irregular in 3 cases. The patients also suffered from pain (80%), myodynamia attenuation in lower extremities (66.7%), aggravated spasm (46.7%), sensation loss or hypesthesia (46.7%), decreased coordinate function of lower extremities (20%) and autonomic nerve symptom (6.7%).Conclusions: Post-traumatic thoracolumbar syringomyelia should be suspected if the patient has new neurological symptoms, such as myodynamia attenuation in lower extremities, after the neural function becomes stable for certain time.

  7. Pedicle screw fixation against burst fracture of thoracolumbar vertebrae

    Institute of Scientific and Technical Information of China (English)

    L(U) Fu-xin; HUANG Yong; ZHANG Qiang; SHI Feng-lei; ZHAO Dong-sheng; HU Qiao

    2007-01-01

    Objective: To analyze the application of vertebral pedicle screw fixation in the treatment of burst fracture of thoracolumbar vertebrae.Methods: A total of 48 cases (31 males and 17 females, aged from 18-72 years, mean: 41.3 years) with thoracolumbar vertebrae burst fracture were treated by pedicle screw system since January 2004. According to the AO classification of thoracolumbar vertebrae fracture,there are 36 cases of Type A, 9 of Type B and 3 of Type C.Results: All patients were followed up for 6-25 months (average 12 months ), no secondary nerve root injury, spinal cord injury, loosening or breakage of pedicle screw were observed. The nerve function of 29 patients with cauda equina nerve injury was restored to different degrees. The vertebral body height returned to normal level and posterior process angle was rectified after operation.Conclusions: The vertebral pedicle screw internal fixation was technologically applicable, which can efficiently reposition and stablize the bursting fractured vertabrae,indirectly decompress canalis spinalis, maintain spine stablity, scatter stress of screw system, reduce the risk of loosening or breakage of screw and loss of vertebral height,and prevent the formation of posterior convex after operation.

  8. Structural and leakage integrity of tubes affected by circumferential cracking

    Energy Technology Data Exchange (ETDEWEB)

    Hernalsteen, P. [TRACTEBEL, Brussels (Belgium)

    1997-02-01

    In this paper the author deals with the notion that circumferential cracks are generally considered unacceptable. He argues for the need to differentiate two facets of such cracks: the issue of the size and growth rate of a crack; and the issue of the structural strength and leakage potential of the tube in the presence of the crack. In this paper the author tries to show that the second point is not a major concern for such cracks. The paper presents data on the structural strength or burst pressure characteristics of steam generator tubes derived from models and data bases of experimental work. He also presents a leak rate model, and compares the performance of circumferential and axial cracks as far as burst strength and leak rate. The final conclusion is that subject to improvement in NDE capabilities (sizing, detection, growth), that Steam Generator Defect Specific Management can be used to allow circumferentially degraded tubes to remain in service.

  9. Circumferential gap propagation in an anisotropic elastic bacterial sacculus

    CERN Document Server

    Taneja, Swadhin; Rutenberg, Andrew D

    2013-01-01

    We have modelled stress concentration around small gaps in anisotropic elastic sheets, corresponding to the peptidoglycan sacculus of bacterial cells, under loading corresponding to the effects of turgor pressure in rod-shaped bacteria. We find that under normal conditions the stress concentration is insufficient to mechanically rupture bacteria, even for gaps up to a micron in length. We then explored the effects of stress-dependent smart-autolysins, as hypothesised by Arthur L Koch [Advances in Microbial Physiology 24, 301 (1983); Research in Microbiology 141, 529 (1990)]. We show that the measured anisotropic elasticity of the PG sacculus can lead to stable circumferential propagation of small gaps in the sacculus. This is consistent with the recent observation of circumferential propagation of PG-associated MreB patches in rod-shaped bacteria. We also find a bistable regime of both circumferential and axial gap propagation, which agrees with behavior reported in cytoskeletal mutants of B. subtilis. We con...

  10. Circumferential fusion improves outcome in comparison with instrumented posterolateral fusion

    DEFF Research Database (Denmark)

    Videbaek, Tina S; Christensen, Finn B; Soegaard, Rikke;

    2006-01-01

    -36 instrument, and the Low Back Pain Rating Scale. All measures assessed the endpoint outcomes at 5 to 9 years after surgery. RESULTS: The available response rate was 93%. The circumferential group showed a significantly better improvement (P ...STUDY DESIGN: Prospective randomized clinical study with a 5- to 9-year follow-up period. OBJECTIVE: The aim of the present study was to analyze the long-term outcome with respect to functional disability, pain, and general health of patients treated by means of circumferential lumbar fusion...... fusion (titanium Cotrel-Dubousset) or circumferential lumbar fusion (instrumented posterolateral fusion with anterior intervertebral support by a Brantigan cage). The primary outcome measure was the Dallas Pain Questionnaire (DPQ). The secondary outcome measures were the Oswestry Disability Index, the SF...

  11. GUIDED CIRCUMFERENTIAL WAVES IN DOUBLE-WALLED CARBON NANOTUBES

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    A model of guided circumferential waves propagating in double-walled carbon nanotubes is built by the theory of wave propagation in continuum mechanics, while the van der Waals force between the inner and outer nanotube has been taken into account in the model. The dispersion curves of the guided circumferential wave propagation are studied, and some dispersion characteristics are illustrated by comparing with those of single-walled carbon nanotubes. It is found that in double-walled carbon nanotubes, the guided circumferential waves will propagate in more dispersive ways. More interactions between neighboring wave modes may take place. In particular, it has been found that a couple of wave modes may disappear at a certain frequency and that, while a couple of wave modes disappear, another new couple of wave modes are excited at the same wave number.

  12. Percutaneous Pedicle Screw Fixation with Polymethylmethacrylate Augmentation for the Treatment of Thoracolumbar Intravertebral Pseudoarthrosis Associated with Kummell's Osteonecrosis.

    Science.gov (United States)

    Kim, Hyeun-Sung; Heo, Dong-Hwa

    2016-01-01

    Purpose. The purpose of our study is to evaluate the therapeutic efficacy of short-segment percutaneous pedicle screw fixation with polymethylmethacrylate (PMMA) augmentation for the treatment of osteoporotic thoracolumbar compression fracture with osteonecrosis. Methods. Osteoporotic thoracolumbar compression fractures with avascular necrosis were treated by short-segment PPF with PMMA augmentation. Eighteen were followed up for more than 2 years. The kyphotic angle, compression ratio, visual analog scale (VAS) score for back pain, and the Oswestry Disability Index (ODI) were analyzed. In addition, radiologic and clinical parameters of PPF group were compared with percutaneous vertebroplasty (PVP) group. Results. Vertebral height and kyphotic angle of the compressed vertebral bodies were significantly corrected after the operation (P lower in the PPF group (P < 0.05). The postoperative ODI and VAS of the PVP group were significantly higher than the PPF (P < 0.05). Conclusions. According to our results, short-segment PPF with PMMA augmentation may be an effective minimally invasive treatment for osteoporosis in cases of osteoporotic vertebral compression fractures with Kummell's osteonecrosis. PMID:27595101

  13. Comparison of Surgical Outcomes Between Short-Segment Open and Percutaneous Pedicle Screw Fixation Techniques for Thoracolumbar Fractures.

    Science.gov (United States)

    Fu, Zhiguo; Zhang, Xi; Shi, Yaohua; Dong, Qirong

    2016-01-01

    BACKGROUND This study aimed to compare the surgical outcomes between open pedicle screw fixation (OPSF) and percutaneous pedicle screw fixation (PPSF) for the treatment of thoracolumbar fractures, which has received scant research attention to date. MATERIAL AND METHODS Eight-four patients with acute and subacute thoracolumbar fractures who were treated with SSPSF from January 2013 to June 2014 at the Changzhou Hospital of Traditional Chinese Medicine (Changzhou, China) were retrospectively reviewed. The patients were divided into 4 groups: the OPSF with 4 basic screws (OPSF-4) group, the OPSF with 4 basic and 2 additional screws (OPSF-6) group, the PPSF with 4 basic screws (PPSF-4) group, and the PPSF with 4 basic and 2 additional screws (PPSF-6) group. The intraoperative, immediate postoperative, and over 1-year follow-up outcomes were evaluated and compared among these groups. RESULTS Blood loss in the PPSF-4 group and the PPSF-6 group was significantly less than in the OPSF-4 group and the OPSF-6 group (Pfractured vertebra than the other 3 groups (Pfractured vertebrae at final follow-up among the 4 groups (P>0.05). CONCLUSIONS OPSF with 6 screws had an advantage in the correction of injured vertebral height and kyphosis, and PPSF reduced the intraoperative blood loss of patients. PMID:27602557

  14. Treatment of Thoracolumbar Vertebrate Fracture by Transpedicular Morselized Bone Grafting in Vertebrae for Spinal Fusion and Pedicle Screw Fixation

    Institute of Scientific and Technical Information of China (English)

    Jinguo WANG; Hua WU; Xiaolin DING; Yutian LIU

    2008-01-01

    To enhance the fusion of graft bone in thoracolumbar vertebrae and minimize the postoperative loss of correction, short-segment pedicle screw fixation was reinforced with posterior moselizee bone grafting in vertebrae for spinal fusion in patients with thoracrolumbar vertebrate fractures. Seventy patients with thoracrolumbar vertebrate fractures were treated by short-segment pedicle screw fixation and were randomly divided into two groups. Fractures in group A (n=20) were reinforced with posterior morselized bone grafting in vertebrae for spinal fusion, while patients group B (n=50) did not receive the morselized bone grafting for bone fusion. The two groups were compared in terms of kyphotic deformity, anterior vertebral height, instrument failure and neurological functions after the treatment. Frankel grading system was used for the evaluation of neurological evaluation and Denis scoring scale was employed for pain assessment. The results showed that the kyphosis correction was achieved in both group A and group B (group A: 6.4 degree; group B: 5.4 degree)/At the end of follow-up, kyphosis correction was maintained in group A but lost in group B (P=0.0001). Postoperatively, greater anterior height was achieved in group A than in group B (P<0.01). During follow-up study, anterior vertebral height was maintained only in Group A (P<0.001). Both group A and group B showed good Denis pain scores (P1 and P2) but group A outdid group B in terms of control of severe and constant pain (P4 and P5). By Frankel criteria, the changes in neurological functions in group A was better than those of group B (P<0.001). It is concluded that reinforcement of short-segment pedicle fixation with morselized bone grafting for the treatment of patients with thoracolumbar vertebrae fracture could achieve and maintain kyphosis correction, and it may also increase and maintain anterior vertebral height. Morselized bone grafting in vertebrae offers immediate spinal stability in patients with

  15. Treatment of Thoracolumbar Spinal Infections through Anterolateral Approaches Using Expandable Titanium Mesh Cage for Spine Reconstruction

    Directory of Open Access Journals (Sweden)

    Tarantino Roberto

    2012-01-01

    Full Text Available Pyogenic vertebral osteomyelitis (PVO is still a rare pathology. However, its incidence is on the rise. This is due to an increasing population with predisposing factors. Also, the availability of more effective diagnostic tools has brought it increasingly to the surgeon’s attention. In this study the patients were treated in the Neurosurgery Division of the Department of Neurological Sciences and Psychiatry of the Sapienza University of Rome, between 2001 and 2009. They had thoracolumbar pyogenic spondylitis. This study was undertaken in order to identify the correct diagnostic and therapeutic treatment needed in such cases. From the cases studied here, it is evident that spinal infections can be extremely insidious and that diagnosis tends to be reached late. Surgery, along with the antibiotic treatment, allows for eradication of the causes of the pathology by the reclamation of the affected region. Surgery is also fundamental in helping to recover vital functions and in restoring as much as possible the correct curvature of the rachises. The use of an anterolateral approach is dictated by the necessity of obtaining 360° stability as well as by the need to clear away extensive infections, which are not always reachable using a posterior approach.

  16. Treatment of Thoracolumbar Spinal Infections through Anterolateral Approaches Using Expandable Titanium Mesh Cage for Spine Reconstruction

    Science.gov (United States)

    Roberto, Tarantino; Daniele, Marruzzo; Martina, Cappelletti; Tiziano, De Giacomo; Roberto, Delfini

    2012-01-01

    Pyogenic vertebral osteomyelitis (PVO) is still a rare pathology. However, its incidence is on the rise. This is due to an increasing population with predisposing factors. Also, the availability of more effective diagnostic tools has brought it increasingly to the surgeon's attention. In this study the patients were treated in the Neurosurgery Division of the Department of Neurological Sciences and Psychiatry of the Sapienza University of Rome, between 2001 and 2009. They had thoracolumbar pyogenic spondylitis. This study was undertaken in order to identify the correct diagnostic and therapeutic treatment needed in such cases. From the cases studied here, it is evident that spinal infections can be extremely insidious and that diagnosis tends to be reached late. Surgery, along with the antibiotic treatment, allows for eradication of the causes of the pathology by the reclamation of the affected region. Surgery is also fundamental in helping to recover vital functions and in restoring as much as possible the correct curvature of the rachises. The use of an anterolateral approach is dictated by the necessity of obtaining 360° stability as well as by the need to clear away extensive infections, which are not always reachable using a posterior approach. PMID:23193382

  17. A Critical Appraisal of Circumferential Resection Margins in Esophageal Carcinoma

    NARCIS (Netherlands)

    Pultrum, Bareld B.; Honing, Judith; Smit, Justin K.; van Dullemen, Hendrik M.; van Dam, Gooitzen M.; Groen, Henk; Hollema, Harry; Plukker, John Th. M.

    2010-01-01

    In esophageal cancer, circumferential resection margins (CRMs) are considered to be of relevant prognostic value, but a reliable definition of tumor-free CRM is still unclear. The aim of this study was to appraise the clinical prognostic value of microscopic CRM involvement and to determine the opti

  18. Ultransonic circumferential waves in empty and water- filled tubes

    Science.gov (United States)

    Li, Xing

    Ultrasonic waves propagating in the circumference of elastic isotropic cylindrical shells are theoretically and experimentally studied. Dispersion relations of different circumferential modes, including the SH-type and Lamb-type families, are obtained by solving the wave equations numerically. Asymptotic solutions are also given for the SH-like modes. Various technologies are applied for generating and detecting the circumferential waves. In particular, a new approach is developed for experimental determination of the dispersion of the circumferential waves in cylindrical shells. With a chirp interdigital transducer (IDT) as a broadband transmitter and receiver made on a stainless steel tube coated with piezoelectric film, both the group and phase velocities of the circumferential waves are obtained over a wide frequency range, which covers the most sensitive region of the lowest flexural mode. Other transduction approaches are also used as complementary tools in the experiments. Experiments are carried out on both empty and fluid- loaded cylindrical shells at different frequencies. With the specially developed experimental configuration, propagation of a new flexural wave type in a water-filled tube is observed. Mode conversions are also observed between the A 0 mode in the shell and the compressional waves in the water. The results show good application potentials in liquid level sensing.

  19. Evaluation of the MR imaging findings of ankylosing spondylitis involving the thoracolumbar spine

    Energy Technology Data Exchange (ETDEWEB)

    Park, Jun Kyoon; Choi, Jeong Yeol [Chosun Univ., Kwangju (Korea, Republic of). Coll. of Medicine; Park, Jin Gyoon [Chonnam Univ., Kwangju (Korea, Republic of). Coll. of Medicine

    1998-02-01

    To evaluate the MR imaging findings of ankylosing spondylitis involving the thoracolumbar spine. We retrospectively analyzed MR imaging findings in ten patients with ankylosing spondylitis involving the thoracolumbar spine. All were male and ranged in age from 24 to 47 (mean, 33) years. MR images were obtained using a 1.5T imager, and signal intensity changes of vertebral bodies were evaluated on sagittal T1- and T2-weighted images. Plain radiographic findings were also evaluated. Characteristics MR imaging findings of ankylosing spondylitis involving the thoracolumbar vertebral bodies were focal signal intensity changes at the corners and along the anterior borders of the vertebral bodies. (author). 19 refs., 4 figs.

  20. Pedicale screw system plus ACPC perfusion to treat fractures of thoracolumbar vertebrae

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    @@In recent years the pedicle screw system has been widely used in treating thoracolumbar vertebral fractures. The effect to recover the injured vertebrae height, the spinal physiological curve and to decompress vertebral canal has been confirmed. But the problems of internal fixation bending, loosening and breaking, which result in the loss of the vertebral height and spinal angulation deformity, are quite common and cause a lot of difficulties for surgeons. To solve these problems and decrease the sequelae from treating thoracolumbar vertebrae fractures with vertebral pedicle screw system, we have tried using vertebral pedicle screw system plus ACPC perfusion to treat 18patients with thoracolumbar vertebral fractures.Satisfactory results have been obtained.

  1. Pediculectomy for the treatment of thoracolumbar disk disease

    Directory of Open Access Journals (Sweden)

    Leonardo Martins Leal

    2011-06-01

    Full Text Available Thoracolumbar disk disease is a condition associated with spinal cord compression that leads to the extrusion of the nucleus pulposus of an intervertebral disk. It can cause mild pain to very severe symptoms including complete paralysis of the pelvic limbs. The treatment for this disease depends on the location and severity of the compression. The objective of this study was to use pediculectomy surgery technique, for spinal decompression, on a seven-year-old female dog that was a mixed breed, suffered from pelvic limb paresis, and was diagnosed with dorsolateral thoracolumbar disk disease. A disk fenestration was also performed in the area to prevent the recurrence of the symtoms. The pediculectomy technique involves creating a slot in the lateral area of the vertebras to preserve the articular facets. Thirty days after the surgery the patient was walking normally. The pediculectomy technique is a good surgical option because it promotes decompression, and extruded material can be removed, which leads to less instability decreases the chance of vertebral dislocation and allows disk fenestration to be performed during the same surgical period. Pediculectomy was effective in the treatment of this patient.

  2. Four year experience with the AO Anterior Thoracolumbar Locking Plate.

    Science.gov (United States)

    Thalgott, J S; Kabins, M B; Timlin, M; Fritts, K; Giuffre, J M

    1997-05-01

    For decades spinal surgeons have attempted to design simple, single stage anterior internal fixation systems for the thoracic and lumbar spine. Early devices presented both biomechanical and technical problems. The AO Anterior Thoracolumbar Locking Plate (ATLP) was designed to solve some of the problems encountered with early anterior instrumentation. The ATLP system is constructed in Commercially Pure titanium. It is a low profile device indicated for use for unstable burst fractures in the anterior column; metastatic tumor management; and degenerative diseases of the thoracolumbar spine between levels T10 and L5. Implantation of the device involves direct anterior decompression with sagittal reduction and corpectomy. This is followed by grafting reconstruction, and plate fixation. This device has been implanted in 25 patients with an average follow-up of 38 months. There were five (5) broken screws in three (3) patients, and no broken plates. Implant related postoperative complications included two misplaced screws. Preliminary results indicate that the ATLP system seems to be a safe, low profile, MRI/CT compatible device that provides definitive single stage fixation of the anterior spinal column. PMID:9160452

  3. Circumferential wires as a supplement to intramedullary nailing in unstable trochanteric hip fractures

    DEFF Research Database (Denmark)

    Ban, Ilija; Birkelund, Lasse; Palm, Henrik;

    2012-01-01

    Fixation of unstable trochanteric fractures is challenging. Application of a circumferential wire may facilitate bone contact and avoid postoperative fracture displacement. However, the use of circumferential wires remains controversial due to possible disturbance of the blood supply to the under...

  4. Nonlinear Local Bending Response and Bulging Factors for Longitudinal and Circumferential Cracks in Pressurized Cylindrical Shells

    Science.gov (United States)

    Young, Richard D.; Rose, Cheryl A.; Starnes, James H., Jr.

    2000-01-01

    Results of a geometrically nonlinear finite element parametric study to determine curvature correction factors or bulging factors that account for increased stresses due to curvature for longitudinal and circumferential cracks in unstiffened pressurized cylindrical shells are presented. Geometric parameters varied in the study include the shell radius, the shell wall thickness, and the crack length. The major results are presented in the form of contour plots of the bulging factor as a function of two nondimensional parameters: the shell curvature parameter, lambda, which is a function of the shell geometry, Poisson's ratio, and the crack length; and a loading parameter, eta, which is a function of the shell geometry, material properties, and the applied internal pressure. These plots identify the ranges of the shell curvature and loading parameters for which the effects of geometric nonlinearity are significant. Simple empirical expressions for the bulging factor are then derived from the numerical results and shown to predict accurately the nonlinear response of shells with longitudinal and circumferential cracks. The numerical results are also compared with analytical solutions based on linear shallow shell theory for thin shells, and with some other semi-empirical solutions from the literature, and limitations on the use of these other expressions are suggested.

  5. Experimental Study on Stress Relaxation and Creep Properties of Human Thoracolumbar Vertebral Bodies and Intervertebral Discs

    Institute of Scientific and Technical Information of China (English)

    2009-01-01

    Objective:Underwater shock can produce extremely high accelerations, resulting in severe human injuries on shipboard, and human thoraco lumbar spines are prone to suffer from injuries by ship shock motion. To observe the viscoelasticity of thoracolumbar of young fresh cadavers, and to provide biomechanical parameters for both research and clinical practice. Materials and Methods:5 fresh young male cadavers (aged 22 to 31 years) were provided, and 15 thoracolumbar spinal anatomies of 5 samples were harvested...

  6. Current status and perspective of diagnosis and treatment of thoracolumbar fracture in China

    Institute of Scientific and Technical Information of China (English)

    唐天驷; 俞杭平

    2003-01-01

    @@ Since the late 20th century owing to the improvement of spinal surgery techniques, the diagnosis and treatment of thoracolumbar fracture have been perfected more and more. Although the advent of modern spinal surgery in China was late, we have gained some advanced achievements owing to various international communications benefited from the open policy. Therefore, it is essential to evaluate the current status and perspective of diagnosis and treatment of thoracolumbar fracture. There are several issues we would like to discuss here.

  7. Percutaneous Vertebral Augmentation with Polyethylene Mesh and Allograft Bone for Traumatic Thoracolumbar Fractures

    Directory of Open Access Journals (Sweden)

    C. Schulz

    2015-01-01

    Full Text Available Purpose. In cases of traumatic thoracolumbar fractures, percutaneous vertebral augmentation can be used in addition to posterior stabilisation. The use of an augmentation technique with a bone-filled polyethylene mesh as a stand-alone treatment for traumatic vertebral fractures has not yet been investigated. Methods. In this retrospective study, 17 patients with acute type A3.1 fractures of the thoracic or lumbar spine underwent stand-alone augmentation with mesh and allograft bone and were followed up for one year using pain scales and sagittal endplate angles. Results. From before surgery to 12 months after surgery, pain and physical function improved significantly, as indicated by an improvement in the median VAS score and in the median pain and work scale scores. From before to immediately after surgery, all patients showed a significant improvement in mean mono- and bisegmental kyphoses. During the one-year period, there was a significant loss of correction. Conclusions. Based on this data a stand-alone approach with vertebral augmentation with polyethylene mesh and allograft bone is not a suitable therapy option for incomplete burst fractures for a young patient collective.

  8. Circumferential buckling instability of a growing cylindrical tube

    KAUST Repository

    Moulton, D.E.

    2011-03-01

    A cylindrical elastic tube under uniform radial external pressure will buckle circumferentially to a non-circular cross-section at a critical pressure. The buckling represents an instability of the inner or outer edge of the tube. This is a common phenomenon in biological tissues, where it is referred to as mucosal folding. Here, we investigate this buckling instability in a growing elastic tube. A change in thickness due to growth can have a dramatic impact on circumferential buckling, both in the critical pressure and the buckling pattern. We consider both single- and bi-layer tubes and multiple boundary conditions. We highlight the competition between geometric effects, i.e. the change in tube dimensions, and mechanical effects, i.e. the effect of residual stress, due to differential growth. This competition can lead to non-intuitive results, such as a tube growing to be thinner and yet buckle at a higher pressure. © 2011 Elsevier Ltd. All rights reserved.

  9. Trauma induces apoptosis in human thoracolumbar intervertebral discs

    Directory of Open Access Journals (Sweden)

    Ertel Wolfgang

    2006-05-01

    Full Text Available Abstract Background Vertebral fractures resulting from high energy trauma often comprise the risk of posttraumatic degenerative changes in the affected intervertebral discs (IVD. Particularly in conservatively treated patients, or in cases after implant removal of an exclusively posterior stabilization, consecutive disc degeneration and the associated functional losing of the spinal segment clearly represent detrimental treatment results. In this regard, apoptosis of IVD cells has been suggested to be involved in the critical changes of the extracellular matrix. Methods To investigate whether fractures of the vertebrae induce apoptosis in the affected IVD, disc tissue from patients (n = 17 undergoing open reduction and internal fixation of thoracolumbar spine fractures were analysed in regards to caspase activity, apoptosis-receptor expression levels and gene expression of apoptosis-regulating proteins such as Bax and Bcl-2. Healthy IVD tissue (n = 3 obtained from patients undergoing surgical resection of adjacent vertebrae were used as control samples. Results In contrast to healthy control IVD tissues, samples from traumatic thoracolumbar IVD showed positive TUNEL staining and a significant increase of caspase-3/7 activity. Interestingly, analyses of the initiator caspase-8 and -9 revealed significantly increased activation levels compared to control values, suggesting the coexistent activation of both the extrinsic (receptor-mediated and intrinsic (mitochondria-mediated apoptosis pathway. Accordingly, expression levels of the Fas receptor (FasR mRNA were significantly increased. Although the TNF receptor I (TNFR I was only slightly upregulated, corresponding TNFα from trauma IVD presented significantly increased mRNA expression values. Furthermore, traumatic IVD cells demonstrated significantly reduced expression of the mitochondria-bound anti-apoptotic Bcl-2, thereby maintaining baseline transcriptional levels of the pro-apoptotic Bax

  10. Treatment of acute thoracolumbar burst fractures with kyphoplasty and short pedicle screw fixation: Transpedicular intracorporeal grafting with calcium phosphate: A prospective study

    Directory of Open Access Journals (Sweden)

    Korovessis Panagiotis

    2007-01-01

    Full Text Available Background: In the surgical treatment of thoracolumbar fractures, the major problem after posterior correction and transpedicular instrumentation is failure to support the anterior spinal column, leading to loss of correction and instrumentation failure with associated complaints. We conducted this prospective study to evaluate the outcome of the treatment of acute thoracolumbar burst fractures by transpedicular balloon kyphoplasty, grafting with calcium phosphate cement and short pedicle screw fixation plus fusion. Materials and Methods : Twenty-three consecutive patients of thoracolumbar (T 9 to L 4 burst fracture with or without neurologic deficit with an average age of 43 years, were included in this prospective study. Twenty-one from the 23 patients had single burst fracture while the remaining two patients had a burst fracture and additionally an adjacent A1-type fracture. On admission six (26% out of 23 patients had neurological deficit (five incomplete, one complete. Bilateral transpedicular balloon kyphoplasty with liquid calcium phosphate to reduce segmental kyphosis and restore vertebral body height and short (three vertebrae pedicle screw instrumentation with posterolateral fusion was performed. Gardner kyphosis angle, anterior and posterior vertebral body height ratio and spinal canal encroachment were calculated pre- to postoperatively. Results : All 23 patients were operated within two days after admission and were followed for at least 12 months after index surgery. Operating time and blood loss averaged 45 min and 60 cc respectively. The five patients with incomplete neurological lesions improved by at least one ASIA grade, while no neurological deterioration was observed in any case. The VAS and SF-36 (Role physical and Bodily pain domains were significantly improved postoperatively. Overall sagittal alignment was improved from an average preoperative 16° to one degree kyphosis at final follow-up observation. The anterior

  11. The concave versus convex approach for minimally invasive lateral lumbar interbody fusion for thoracolumbar degenerative scoliosis.

    Science.gov (United States)

    Scheer, Justin K; Khanna, Ryan; Lopez, Alejandro J; Fessler, Richard G; Koski, Tyler R; Smith, Zachary A; Dahdaleh, Nader S

    2015-10-01

    We retrospectively reviewed patient charts to compare the approach-related (convex versus concave) neurological complications and magnitude of correction in patients undergoing lateral lumbar interbody fusion (LLIF). It is yet to be quantitatively determined if correction of adult degenerative scoliosis from either side of the curve apex using a LLIF results in a reduction in complications and/or improved corrective ability. The inclusion criteria for this study were patients who underwent a LLIF for adult degenerative thoracolumbar scoliosis and had the LLIF prior to any other supplemental procedures. Patients were grouped based on the approach toward the curve apex concavity (CAVE) or the convexity (VEX). Standard coronal and sagittal radiographic measurements were made. Neurological complications and reoperation indications were also recorded. We included 32 patients for review (CAVE: 17; VEX: 15) with a mean age of 65.5 years±a standard deviation of 10.2, and mean follow-up of 17.0 months±15.7. There were eight postoperative neurological complications in eight patients (25.0%), and seven reoperations for six patients (18.8%; CAVE: 4/17 [23.5%]; VEX: 2/15 [13.3%]). The CAVE group had 6/17 neurological complications (35.3%; four ipsilateral and two contralateral to approach side) and VEX had 2/15 (13.3%; one ipsilateral and one bilateral to approach side; p>0.05). All patients significantly improved in the mean regional and segmental Cobb angles (p0.05). There were no significant differences between the groups for any of the radiographic parameters measured (p>0.05). Approaching the curve apex from either the concave or convex side resulted in significant improvements. The concave approach was associated with more postoperative neurological complications.

  12. First performance evaluation of software for automatic segmentation, labeling and reformation of anatomical aligned axial images of the thoracolumbar spine at CT

    International Nuclear Information System (INIS)

    Highlights: •Automatic segmentation and labeling of the thoracolumbar spine. •Automatically generated double-angulated and aligned axial images of spine segments. •High grade of accurateness for the symmetric depiction of anatomical structures. •Time-saving and may improve workflow in daily practice. -- Abstract: Objectives: To evaluate software for automatic segmentation, labeling and reformation of anatomical aligned axial images of the thoracolumbar spine on CT in terms of accuracy, potential for time savings and workflow improvement. Material and methods: 77 patients (28 women, 49 men, mean age 65.3 ± 14.4 years) with known or suspected spinal disorders (degenerative spine disease n = 32; disc herniation n = 36; traumatic vertebral fractures n = 9) underwent 64-slice MDCT with thin-slab reconstruction. Time for automatic labeling of the thoracolumbar spine and reconstruction of double-angulated axial images of the pathological vertebrae was compared with manually performed reconstruction of anatomical aligned axial images. Reformatted images of both reconstruction methods were assessed by two observers regarding accuracy of symmetric depiction of anatomical structures. Results: In 33 cases double-angulated axial images were created in 1 vertebra, in 28 cases in 2 vertebrae and in 16 cases in 3 vertebrae. Correct automatic labeling was achieved in 72 of 77 patients (93.5%). Errors could be manually corrected in 4 cases. Automatic labeling required 1 min in average. In cases where anatomical aligned axial images of 1 vertebra were created, reconstructions made by hand were significantly faster (p < 0.05). Automatic reconstruction was time-saving in cases of 2 and more vertebrae (p < 0.05). Both reconstruction methods revealed good image quality with excellent inter-observer agreement. Conclusion: The evaluated software for automatic labeling and anatomically aligned, double-angulated axial image reconstruction of the thoracolumbar spine on CT is time

  13. First performance evaluation of software for automatic segmentation, labeling and reformation of anatomical aligned axial images of the thoracolumbar spine at CT

    Energy Technology Data Exchange (ETDEWEB)

    Scholtz, Jan-Erik, E-mail: janerikscholtz@gmail.com; Wichmann, Julian L.; Kaup, Moritz; Fischer, Sebastian; Kerl, J. Matthias; Lehnert, Thomas; Vogl, Thomas J.; Bauer, Ralf W.

    2015-03-15

    Highlights: •Automatic segmentation and labeling of the thoracolumbar spine. •Automatically generated double-angulated and aligned axial images of spine segments. •High grade of accurateness for the symmetric depiction of anatomical structures. •Time-saving and may improve workflow in daily practice. -- Abstract: Objectives: To evaluate software for automatic segmentation, labeling and reformation of anatomical aligned axial images of the thoracolumbar spine on CT in terms of accuracy, potential for time savings and workflow improvement. Material and methods: 77 patients (28 women, 49 men, mean age 65.3 ± 14.4 years) with known or suspected spinal disorders (degenerative spine disease n = 32; disc herniation n = 36; traumatic vertebral fractures n = 9) underwent 64-slice MDCT with thin-slab reconstruction. Time for automatic labeling of the thoracolumbar spine and reconstruction of double-angulated axial images of the pathological vertebrae was compared with manually performed reconstruction of anatomical aligned axial images. Reformatted images of both reconstruction methods were assessed by two observers regarding accuracy of symmetric depiction of anatomical structures. Results: In 33 cases double-angulated axial images were created in 1 vertebra, in 28 cases in 2 vertebrae and in 16 cases in 3 vertebrae. Correct automatic labeling was achieved in 72 of 77 patients (93.5%). Errors could be manually corrected in 4 cases. Automatic labeling required 1 min in average. In cases where anatomical aligned axial images of 1 vertebra were created, reconstructions made by hand were significantly faster (p < 0.05). Automatic reconstruction was time-saving in cases of 2 and more vertebrae (p < 0.05). Both reconstruction methods revealed good image quality with excellent inter-observer agreement. Conclusion: The evaluated software for automatic labeling and anatomically aligned, double-angulated axial image reconstruction of the thoracolumbar spine on CT is time

  14. Reduced thoracolumbar fascia shear strain in human chronic low back pain

    Directory of Open Access Journals (Sweden)

    Konofagou Elisa E

    2011-09-01

    Full Text Available Abstract Background The role played by the thoracolumbar fascia in chronic low back pain (LBP is poorly understood. The thoracolumbar fascia is composed of dense connective tissue layers separated by layers of loose connective tissue that normally allow the dense layers to glide past one another during trunk motion. The goal of this study was to quantify shear plane motion within the thoracolumbar fascia using ultrasound elasticity imaging in human subjects with and without chronic low back pain (LBP. Methods We tested 121 human subjects, 50 without LBP and 71 with LBP of greater than 12 months duration. In each subject, an ultrasound cine-recording was acquired on the right and left sides of the back during passive trunk flexion using a motorized articulated table with the hinge point of the table at L4-5 and the ultrasound probe located longitudinally 2 cm lateral to the midline at the level of the L2-3 interspace. Tissue displacement within the thoracolumbar fascia was calculated using cross correlation techniques and shear strain was derived from this displacement data. Additional measures included standard range of motion and physical performance evaluations as well as ultrasound measurement of perimuscular connective tissue thickness and echogenicity. Results Thoracolumbar fascia shear strain was reduced in the LBP group compared with the No-LBP group (56.4% ± 3.1% vs. 70.2% ± 3.6% respectively, p Conclusion Thoracolumbar fascia shear strain was ~20% lower in human subjects with chronic low back pain. This reduction of shear plane motion may be due to abnormal trunk movement patterns and/or intrinsic connective tissue pathology. There appears to be some sex-related differences in thoracolumbar fascia shear strain that may also play a role in altered connective tissue function.

  15. MANAGEMENT OF UNSTABLE THORACOLUMBAR FRACTURES BY POSTERIOR INSTRUMENTATION WITH TRANSPEDICULAR PEDICLE SCREWS AND CONNECTING RODS

    Directory of Open Access Journals (Sweden)

    Jayaram

    2015-09-01

    Full Text Available OBJECTIVE: To evaluate the use of pedicle screw and rod fixation in post - traumatic unstable thoracolumbar Spine fractures. METHODS: Thirty six patients with posttraumatic instability of thoracolumbar were included in the study. Thoracolumbar injury severity scoring was used to assess spinal instability. All patients underwent open reduction and internal fixation by posterior approach. Pedicles were localized using detailed anatomical landmarks and intraoperative imaging. The neurological status of the patients was assessed using ASIA grading and any other complications were noted up to 6 months. RESULTS: There were 36 patients with unstable thoracolumbar junction injuries who were managed with pedicle screws and rods. M ales were more affected (M: F ratio was 8: 1. AO type A was the commonest. The most common level was L1. None of the patients deteriorated after surgery. 27 patients with incomplete cord injury showed at least one frankel grade improvement. 8 patients with complete cord injury showed no improvement. The mean kyphotic angle by Cobb’s method was 20.8° on admission, 4.6° post operatively and 6.1° at latest follow - up . Average anterior vertebral body height at the time of admission was 52%, post op was 85% and at final follow up was 80%. T here was 1 case of malpositiong of screw and 5 patients developed bed sores. CONCLUSION: Pedicle screw fixation is a useful choice for thoracolumbar junction injuries for achieving reduction and stability, without affecting extra motion segments.

  16. Short segmental pedicle screw fixation combined with percutaneous vertebroplasty in treatment of nonadjacent thoracolumbar fractures

    Institute of Scientific and Technical Information of China (English)

    HE Qing-yi; XU Jian-zhong

    2009-01-01

    To evaluate the short-term outcomes of short segmental pedicle screw fixation combined with per-cutaneous vertebroplasty in treatment of nonadjacent tho-racolumbar fractures. Methods: Twenty patients who suffered from nonadja-cent thoracolumbar fractures were treated by short segmental pedicle screw fixation for burst fracture and by percutane-ous vertebroplasty for compression fracture. X-rays, CT and MRI scans were conducted using the same protocol before and after surgery and during follow-up. Pre- and post-operative American Spinal Injury Association (ASIA) grades, fusion of fracture sites, visual analog scale (VAS) of back pain, and Oswestry disability index (ODI) were accessed. Results: All patients were followed up for an average period of 12 months. The sagittal profile of the thoracolum-bar spine was restored satisfactorily. No patient had neuro-logic deterioration after surgery, and 9 patients with incom-plete lesions improved postoperatively by at least one ASIA grade. The fusion rate was 100%. The average VAS of back pain was 7.6 preoperatively and 3.2 postoperatively. The average ODI was 72.5 preoperatively and 35.5 postoperatively. Conclusions: Short segmental pedicle screw fixation combined with percutaneous vertebroplasty in treatment of nonadjacent thoracolumbar fractures exhibits such advan-tages as preserving functional segment units, reliable fixation, good neurologic recovery and early mobilization and, therefore, is suitable for treating nonadjacent thora-columbar fractures.

  17. Estimation of circumferential fiber shortening velocity by echocardiography.

    Science.gov (United States)

    Ruschhaupt, D G; Sodt, P C; Hutcheon, N A; Arcilla, R A

    1983-07-01

    The M-mode and two-dimensional echocardiograms of 40 young patients were analyzed to compare the mean circumferential fiber shortening velocity (Vcf) of the left ventricle calculated separately by two methods. The mean circumferential fiber shortening velocity was derived from the M-mode echocardiogram as minor axis shortening/ejection time and derived from the two-dimensional echocardiogram as actual circumference change/ejection time. With computer assistance, circumference was determined from the short-axis two-dimensional echocardiographic images during end-diastole and end-systole. Good correlations were obtained between the left ventricular diameter derived by M-mode echocardiography and the vertical axis during end-diastole (r = 0.79) and end-systole (r = 0.88) derived by two-dimensional echocardiography. Likewise, high correlations were noted between diameter and circumference in end-diastole (r = 0.89) and end-systole (r = 0.88). However, comparison of Vcf obtained by M-mode echocardiography with that obtained by two-dimensional echocardiography showed only fair correlation (r = 0.68). Moreover, the diameter/circumference ratio determined in end-diastole and end-systole differed significantly (p less than 0.001), possibly owing to the change in geometry of the ventricular sector image during systole. Although Vcf derived by M-mode echocardiography is a useful index of left ventricular performance, it does not truly reflect the circumference change during systole.

  18. Detection of a longitudinal defect in a pipe based on guided circumferential waves techniques

    Institute of Scientific and Technical Information of China (English)

    LI Longtao; HE Cunfu; WU Bin

    2005-01-01

    Based on elasticity theory, the multi-modes and disperse characteristics of guided circumferential waves in a pipe were investigated theoretically and experimentally, the disperse curves of guided circumferential waves were gotten by numerical calculations. The relationships between the angle of beam transducer, frequency and guided circumferential modes were analyzed by our guided wave experiment system. Then single guided circumferential mode was excited in the pipe (O.D 88.8 mm, I.D 80.8 mm). An artificial longitudinal defect (25 × 1 × 0.7 mm)on the surface of the pipe was detected by use of the single guided circumferential wave. The results show that single guided circumferential mode can be excited in the pipe by choosing special frequency and special angle beam transducer, similar to the excitation of Lamb wave in a plate, and it can be used to find the longitudinal defect on a pipe surface.

  19. Value of multidetector spiral CT in diagnosis of acute thoracolumbar spinal fracture and fracture-dislocation

    Institute of Scientific and Technical Information of China (English)

    龚静山; 徐坚民

    2004-01-01

    Objective:To investigate the diagnostic value of multidetector spiral CT (MSCT) in acute thoracolumbar spinal fracture and fracture-dislocation.Methods: CT imaging files of 152 consecutive traumatic patients with thoracolumbar fractures were retrospectively reviewed. MSCT scannings were performed with a collimation of 3-5 mm and a pitch of 5.5. The postprocessing included sagittal and coronal multiplannar reconstruction, and 3-D reconstruction.Result: There were 88 cases of compression fracture, 54 cases of burst fracture and 10 cases of fracasdislocation. Transverse images of MSCT could visualize all fractures directly and determine whether spinal canal was intact. Postprocessing image was helpful in depicting the displacement of fragment and orientation of dislocation.Conclusions: MSCT plays an important role in diagnosis and management of acute thoracolumbar spinal fracture and fracture-dislocation.

  20. A comparison of instrumentation methods to estimate thoracolumbar motion in field-based occupational studies.

    Science.gov (United States)

    Schall, Mark C; Fethke, Nathan B; Chen, Howard; Gerr, Fred

    2015-05-01

    The performance of an inertial measurement unit (IMU) system for directly measuring thoracolumbar trunk motion was compared to that of the Lumbar Motion Monitor (LMM). Thirty-six male participants completed a simulated material handling task with both systems deployed simultaneously. Estimates of thoracolumbar trunk motion obtained with the IMU system were processed using five common methods for estimating trunk motion characteristics. Results of measurements obtained from IMUs secured to the sternum and pelvis had smaller root-mean-square differences and mean bias estimates in comparison to results obtained with the LMM than results of measurements obtained solely from a sternum mounted IMU. Fusion of IMU accelerometer measurements with IMU gyroscope and/or magnetometer measurements was observed to increase comparability to the LMM. Results suggest investigators should consider computing thoracolumbar trunk motion as a function of estimates from multiple IMUs using fusion algorithms rather than using a single accelerometer secured to the sternum in field-based studies.

  1. Imaging evaluation of traumatic thoracolumbar spine injuries: Radiological review

    Institute of Scientific and Technical Information of China (English)

    Shivanand; Gamanagatti; Deepak; Rathinam; Krithika; Rangarajan; Atin; Kumar; Kamran; Farooque; Vijay; Sharma

    2015-01-01

    Spine fractures account for a large portion of musculoskeletal injuries worldwide. A classification of spine fractures is necessary in order to develop a common language for treatment indications and outcomes. Several classification systems have been developed based on injury anatomy or mechanisms of action, but they have demonstrated poor reliability, have yielded little prognostic information, and have not been widely used. For this reason, the Arbeitsgemeinschaftfür Osteosynthesefragen(AO) committee has classified thorocolumbar spine injuries based on the pathomorphological criteria into3 types(A: Compression; B: Distraction; C: Axial torque and rotational deformity). Each of these types is further divided into 3 groups and 3 subgroups reflecting progressive scale of morphological damage and the degree of instability. Because of its highly detailed sub classifications, the AO system has shown limited interobserver variability. It is similar to its predecessors in that it does not incorporate the patient’s neurologic status.The need for a reliable, reproducible, clinically relevant, prognostic classification system with an optimal balance of ease of use and detail of injury description contributed to the development of a new classification system, the thoracolumbar injury classification and severity score(TLICS). The TLICS defines injury based on three clinical characteristics: injury morphology, integrity of the posterior ligamentous complex, and neurologic status of the patient. The severity score offers prognostic information and is helpful in decision making about surgical vs nonsurgical management.

  2. Imaging evaluation of traumatic thoracolumbar spine injuries: Radiological review.

    Science.gov (United States)

    Gamanagatti, Shivanand; Rathinam, Deepak; Rangarajan, Krithika; Kumar, Atin; Farooque, Kamran; Sharma, Vijay

    2015-09-28

    Spine fractures account for a large portion of musculoskeletal injuries worldwide. A classification of spine fractures is necessary in order to develop a common language for treatment indications and outcomes. Several classification systems have been developed based on injury anatomy or mechanisms of action, but they have demonstrated poor reliability, have yielded little prognostic information, and have not been widely used. For this reason, the Arbeitsgemeinschaftfür Osteosynthesefragen (AO) committee has classified thorocolumbar spine injuries based on the pathomorphological criteria into3 types (A: Compression; B: Distraction; C: Axial torque and rotational deformity). Each of these types is further divided into 3 groups and 3 subgroups reflecting progressive scale of morphological damage and the degree of instability. Because of its highly detailed sub classifications, the AO system has shown limited interobserver variability. It is similar to its predecessors in that it does not incorporate the patient's neurologic status.The need for a reliable, reproducible, clinically relevant, prognostic classification system with an optimal balance of ease of use and detail of injury description contributed to the development of a new classification system, the thoracolumbar injury classification and severity score (TLICS). The TLICS defines injury based on three clinical characteristics: injury morphology, integrity of the posterior ligamentous complex, and neurologic status of the patient. The severity score offers prognostic information and is helpful in decision making about surgical vs nonsurgical management. PMID:26435776

  3. Characterization of mechanical and geometrical properties of a tube with axial and circumferential guided waves.

    Science.gov (United States)

    Yeh, Cheng-Hung; Yang, Che-Hua

    2011-05-01

    Guided waves propagating in cylindrical tubes are frequently applied for the characterization of material or geometrical properties of tubes. In a tube, guided waves can propagate in the axial direction and called axial guided waves, or in the circumferential direction called circumferential guided waves. Dispersion spectra for the axial and circumferential guided waves share some common behaviors and however exhibit some particular behaviors of their own. This study provides an investigation with theoretical modeling, experimental measurements, and a simplex-based inversion procedure to explore the similarity and difference between the axial guided waves and circumferential guided waves, aiming at providing useful information while axial and circumferential guided waves are applied in the area of material characterization. The sensitivity to the radius curvature for the circumferential guided waves dispersion spectra is a major point that makes circumferential guided waves different from axial guided waves. For the purpose of material characterization, both axial and circumferential guided waves are able to extract an elastic moduli and wall-thickness information from the dispersion spectra, however, radius information can only be extracted from the circumferential guided waves spectra. PMID:21211810

  4. Patients Immobilized with a Long Spine Board Rarely Have Unstable Thoracolumbar Injuries.

    Science.gov (United States)

    Clemency, Brian M; Bart, Joseph A; Malhotra, Abhigyan; Klun, Taylor; Campanella, Veronica; Lindstrom, Heather A

    2016-01-01

    Most Emergency Medical Services (EMS) protocols require spine immobilization with both a cervical collar and long spine board for patients with suspected spine injuries. The goal of this research was to determine the prevalence of unstable thoracolumbar spine injuries among patients receiving prehospital spine immobilization: a 4-year retrospective review of adult subjects who received prehospital spine immobilization and were transported to a trauma center. Prehospital and hospital records were linked. Data was reviewed to determine if spine imaging was ordered, whether acute thoracolumbar fractures, dislocations, or subluxations were present. Thoracolumbar injuries were classified as unstable if operative repair was performed. Prehospital spine immobilization was documented on 5,593 unique adult subjects transported to the study hospital. A total of 5,423 (97.0%) prehospital records were successfully linked to hospital records. The subjects were 60.2% male, with a mean age of 40.6 (SD = 17.5) years old. An total of 5,286 (97.4%) subjects had sustained blunt trauma. Hospital providers ordered imaging to rule out spine injury in 2,782 (51.3%) cases. An acute thoracolumbar fracture, dislocation, or subluxation was present in 233 (4.3%) cases. An unstable injury was present in 29 (0.5%) cases. No unstable injuries were found among the 951 subjects who were immobilized following ground level falls. Hospital providers ordered at least one spine x-ray or CT in most patients, and a thoracolumbar imaging in half of all patients immobilized. Only 0.5% of patients who received prehospital spine immobilization had an unstable thoracolumbar spine injury. PMID:27002350

  5. Formative mechanism of intracanal fracture fragments in thoracolumbar burst fractures: a finite element study

    Institute of Scientific and Technical Information of China (English)

    ZENG Zhi-li; ZHU Rui; LI Shan-zhu; YU Yan; WANG Jian-jie; JIA Yong-wei; CHEN Bo

    2013-01-01

    Background Thoracolumbar burst fracture is a common clinical injury,and the fracture mechanism is still controversial.The aim of this research was to study the formation of intracanal fracture fragments in thoracolumbar burst fractures and to provide information for the prevention of thoracolumbar bursts fractures and reduction of damage to the nervous system.Methods A nonlinear three-dimensional finite element model of T11-L3 segments was established,and the injury processes of thoracolumbar bursts were simulated.The intact finite element model and the finite element model after the superior articular were impacted by 100 J of energy in different directions.The distribution and variation of stress in the superior posterior region of the L1 vertebral body were analyzed.Abaqus 6.9 explicit dynamic solver was used as finite element software in calculations.Results A three-dimensional nonlinear finite element model of the thoracolumbar spine was created.In the intact model,stress was concentrated in the superior posterior region of the L1 vertebral body.The stress peak was a maximum for the extension impact load and a minimum for the flexion impact load.The stress peak and contact force in the facet joint had close correlation with time.The stress peak disappeared after excision of the superior articular process.Conclusions The three-dimensional nonlinear finite element model was suitable for dynamic analysis.The contact force in the facet joint,which can be transferred to the superior posterior vertebral body,may explain the spinal canal fragment in thoracolumbar burst fractures.

  6. Biomechanics of Thoracolumbar Burst and Chance-Type Fractures during Fall from Height

    OpenAIRE

    Ivancic, Paul C.

    2014-01-01

    Study Design In vitro biomechanical study. Objective To investigate the biomechanics of thoracolumbar burst and Chance-type fractures during fall from height. Methods Our model consisted of a three-vertebra human thoracolumbar specimen (n = 4) stabilized with muscle force replication and mounted within an impact dummy. Each specimen was subjected to a single fall from an average height of 2.1 m with average velocity at impact of 6.4 m/s. Biomechanical responses were determined using impact lo...

  7. Vertebral stabilisation and selective decompression for the management of triple thoracolumbar disc protrusions.

    Science.gov (United States)

    McKee, W M; Downes, C J

    2008-10-01

    Triple adjacent thoracolumbar disc protrusions causing moderate to severe spinal cord compression were diagnosed by magnetic resonance imaging in two German shepherd dogs with marked paraparesis and pelvic limb ataxia. Both cases were managed by selective hemilaminectomy, partial annulectomy and bilateral quadruple vertebral body stabilisation using novel canine locking fixation plates (SOP). The stabilisation of multiple vertebrae in the thoracolumbar spine was possible because the plates could be contoured with six degrees of freedom. Spinal pain resolved and neurological function improved in both dogs. Screw breakage was evident in one dog five months following surgery. PMID:18631222

  8. Transverse shear effect in a circumferentially cracked cylindrical shell

    Science.gov (United States)

    Delale, F.; Erdogan, F.

    1979-01-01

    The objectives of the paper are to solve the problem of a circumferentially-cracked cylindrical shell by taking into account the effect of transverse shear, and to obtain the stress intensity factors for the bending moment as well as the membrane force as the external load. The formulation of the problem is given for a specially orthotropic material within the framework of a linearized shallow shell theory. The particular theory used permits the consideration of all five boundary conditions as to moment and stress resultants on the crack surface. The effect of Poisson's ratio on the stress intensity factors and the nature of the out-of-plane displacement along the edges of the crack, i.e., bulging, are also studied.

  9. Transient thermal stress problem for a circumferentially cracked hollow cylinder

    Science.gov (United States)

    Nied, H. F.; Erdogan, F.

    1982-01-01

    The transient thermal stress problem for a hollow elasticity cylinder containing an internal circumferential edge crack is considered. It is assumed that the problem is axisymmetric with regard to the crack geometry and the loading, and that the inertia effects are negligible. The problem is solved for a cylinder which is suddenly cooled from inside. First the transient temperature and stress distributions in an uncracked cylinder are calculated. By using the equal and opposite of this thermal stress as the crack surface traction in the isothermal cylinder the crack problem is then solved and the stress intensity factor is calculated. The numerical results are obtained as a function of the Fourier number tD/b(2) representing the time for various inner-to-outer radius ratios and relative crack depths, where D and b are respectively the coefficient of diffusivity and the outer radius of the cylinder.

  10. Accurate wall thickness measurement using autointerference of circumferential Lamb wave

    International Nuclear Information System (INIS)

    In this paper, a method of accurately measuring the pipe wall thickness by using noncontact air-coupled ultrasonic transducer (NAUT) was presented. In this method, accurate measurement of angular wave number (AWN) is a key technique because the AWN is changes minutely with the wall thickness. An autointerference of the circumferential (C-) Lamb wave was used for accurate measurements of the AWN. Principle of the method was first explained. Modified method for measuring the wall thickness near a butt weld line was also proposed and its accuracy was evaluated within 6 μm error. It was also shown in the paper that wall thickness measurement was accurately carried out beyond the difference among the sensors by calibrating the frequency response of the sensors. (author)

  11. MANAGEMENT OF UNSTABLE THORACOLUMBAR SPINAL INJURIES BY POSTERIOR INSTRUMENTATION: A PROSPECTIVE STUDY

    Directory of Open Access Journals (Sweden)

    Shivanaik

    2014-10-01

    Full Text Available BACKGROUND AND OBJECTIVES: Spinal trauma is one of the grave injuries that cause infinite morbidity and disability resulting from high energy trauma. 30-60% of all spinal injuries are concentrated in the thoracic and lumbar spine and 15-20% is associated with neurological injury. The neurological improvement is independent of treatment modality, lately consensus evolving around the world for stabilization of spine with instrumentation allowing early mobilization, prevention and limitation of neurological injury as well as restoration of spinal stability. A number of fixation systems have been advocated. The use of pedicular screws and rod system allows adequate 3 dimensional control of each motion segment and allows rigid fixation. Acceptable results have been reported in majority of patients treated with pedicle screw and rod system with good neurological recovery. The aim of the study was to access the commonest mode, level, type of fracture, efficacy of pedicle screw and rod system and the radiological, neurological and functional out come in order to recreate a stable pain free spinal column. METHODS: This study is a prospective clinical study of unstable thoracolumbar spinal injuries by posterior instrumentation (pedicular screw and rod fixation in thoracic, lumbar, and thoracolumbar spinal fractures. In all, a total of 21 cases were evaluated and assessed during the period from 1st June 2008 to 30th September 2010. The study was conducted in the Department of Orthopaedics, Vijayanagara Institute of Medical sciences, Bellary. Patient selection was according to the inclusion and exclusion criteria and was surgically treated with pedicle screw and rod system. RESULTS: In our series there were 20(94.75% males and 1(5.25% female patient with an average age of 28.3 years 17(82.1% cases due to fall from height, 4(17.9% cases following road traffic accident.16(76.1% cases were of AO Type A, 3 (14.2% of AO Type B, 2(9.52% of AO type C fractures

  12. The use of circumferentially varying stagger guide vanes in an axial flow pump or compressor

    Science.gov (United States)

    Horlock, J. H.

    1990-04-01

    An actuator disk analysis is given of the flow through a guide vane and rotor combination. It is shown that changes in total pressure across the rotor are, in general, related to circumferential variations in guide vane outlet angle. In particular, known variations in inlet total pressure may be eliminated by suitable circumferential changes in guide vane stagger.

  13. [Covering of a thoraco-lumbar defect by omentoplasty].

    Science.gov (United States)

    Le Fourn, B; Loirat, Y; Sartre, J Y; Lejeune, F; Pannier, M

    1997-02-01

    With a case of thoraco-lumbar defect, the authors discuss about different procedures to cover it. In this place, the better procedure is certainly the latissimus dorsi flap, in all combinations. The indication for omentoplasty at this spinal site should not be performed by first intention but by exclusion of other procedures, as in the case considered by the authors. It was a 37-year-old man, paraplegic from the age of 16, with a deep chronic spinal wound, secondary to sepsis of a posterior segmental fixations. A staphylococcus aureus infection which developed as a surgical complication was initially treated with antibiotics and surgical cleaning procedures without removing instrumentation. However, the infection remained active and the material was finally removed. Spinal immobilisation was strengthened by external fixation. The area was cleared of all suspect material, including bone graft, leaving a wide back-wound open to the spine. Spontaneous healing was first attempted, but the size and the chronicity of the wound led us to use pedicled greater omentum to close the defect. The omentum was pedicled on the right gastroepiploic vessels and transferred to the back wound through the posterior abdominal wall muscles, next to the right kidney. This procedure allows rapid healing. In association with suitable antibiotics, it has prevented any recurrent infection after 18 months of follow-up. It was no feasible to cover the wound with a latissimus dorsi flap, considering the importance of this muscle in the movements of a paraplegic and considering the initial impossibility of removing the external fixation.

  14. Innervation changes induced by inflammation of the rat thoracolumbar fascia.

    Science.gov (United States)

    Hoheisel, U; Rosner, J; Mense, S

    2015-08-01

    Recently, the fascia innervation has become an important issue, particularly the existence of nociceptive fibers. Fascia can be a source of pain in several disorders such as fasciitis and non-specific low back pain. However, nothing is known about possible changes of the fascia innervation under pathological circumstances. This question is important, because theoretically pain from the fascia cannot only be due to increased nociceptor discharges, but also to a denser innervation of the fascia by nociceptive endings. In this histological study, an inflammation was induced in the thoracolumbar fascia (TLF) of rats and the innervation by various fiber types compared between the inflamed and intact TLF. Although the TLF is generally considered to have proprioceptive functions, no corpuscular proprioceptors (Pacini and Ruffini corpuscles) were found. To obtain quantitative data, the length of fibers and free nerve endings were determined in the three layers of the rat TLF: inner layer (IL, adjacent to the multifidus muscle), middle layer (ML) and outer layer (OL). The main results were that the overall innervation density showed little change; however, there were significant changes in some of the layers. The innervation density was significantly decreased in the OL, but this change was partly compensated for by an increase in the IL. The density of substance P (SP)-positive - presumably nociceptive - fibers was significantly increased. In contrast, the postganglionic sympathetic fibers were significantly decreased. In conclusion, the inflamed TLF showed an increase of presumably nociceptive fibers, which may explain the pain from a pathologically altered fascia. The meaning of the decreased innervation by sympathetic fibers is obscure at present. The lack of proprioceptive corpuscular receptors within the TLF does not preclude its role as a proprioceptive structure, because some of the free nerve endings may function as proprioceptors.

  15. [Covering of a thoraco-lumbar defect by omentoplasty].

    Science.gov (United States)

    Le Fourn, B; Loirat, Y; Sartre, J Y; Lejeune, F; Pannier, M

    1997-02-01

    With a case of thoraco-lumbar defect, the authors discuss about different procedures to cover it. In this place, the better procedure is certainly the latissimus dorsi flap, in all combinations. The indication for omentoplasty at this spinal site should not be performed by first intention but by exclusion of other procedures, as in the case considered by the authors. It was a 37-year-old man, paraplegic from the age of 16, with a deep chronic spinal wound, secondary to sepsis of a posterior segmental fixations. A staphylococcus aureus infection which developed as a surgical complication was initially treated with antibiotics and surgical cleaning procedures without removing instrumentation. However, the infection remained active and the material was finally removed. Spinal immobilisation was strengthened by external fixation. The area was cleared of all suspect material, including bone graft, leaving a wide back-wound open to the spine. Spontaneous healing was first attempted, but the size and the chronicity of the wound led us to use pedicled greater omentum to close the defect. The omentum was pedicled on the right gastroepiploic vessels and transferred to the back wound through the posterior abdominal wall muscles, next to the right kidney. This procedure allows rapid healing. In association with suitable antibiotics, it has prevented any recurrent infection after 18 months of follow-up. It was no feasible to cover the wound with a latissimus dorsi flap, considering the importance of this muscle in the movements of a paraplegic and considering the initial impossibility of removing the external fixation. PMID:9768139

  16. Analysis of circumferential waves on a water-filled cylindrical shell

    Institute of Scientific and Technical Information of China (English)

    FAN Wei; ZHENG Guoyin; FAN Jun

    2012-01-01

    The formation of scattering field from a water-filled cylindrical shell was studied. The analytic solutions of scattering field are derived using elastic thin shell theory and Sommerfeld-Watson Transformation (SWT) method. Complex wave-number poles of circumferential waves are found numerically, the phase speed and attenuation of circumferential waves between the situation of a hollow cylindrical shell and a water-filled cylindrical shell are compared. The synthesis of backscattering form functions which are sum of specular reflection component and circumferential waves is consistent with normal mode result. The calculated echo sequences of additional fluid circumferential waves are compared with experimental results. The results show that richer resonance peaks appeared in the backscattering form functions of a water-filled cylindrical shell and the formation of echo's structure are due to re-radiation effects of additional fluid circumferential waves.

  17. Accuracy of ultrasound-guided injections of thoracolumbar articular process joints in horses

    DEFF Research Database (Denmark)

    Fuglbjerg, Vibeke; Nielsen, J.V.; Thomsen, Preben Dybdahl;

    2010-01-01

    in the literature. Objectives: To evaluate factors of affecting the accuracy of intra-articular injections of the APJs in the caudal thoracolumbar region. Method: One-hundred-and-fifty-four injections with blue dye were performed on APJs including the T14-L6 region in 12 horses subjected to euthanasia for reasons...

  18. Treatment of traumatic thoracolumbar spine fractures : A multicenter prospective randomized study of operative versus nonsurgical treatment

    NARCIS (Netherlands)

    Siebenga, Jan; Leferink, Vincent J. M.; Segers, Michiel J. M.; Elzinga, Matthijs J.; Bakker, Fred C.; Haarman, Henk J. Th. M.; Rommens, Pol M.; ten Duis, Henk-Jan; Patka, Peter

    2006-01-01

    Study Design. Multicenter prospective randomized trial. Objective. To test the hypotheses that thoracolumbar AO Type A spine fractures without neurologic deficit, managed with short-segment posterior stabilization will show an improved radiographic outcome and at least the same functional outcome as

  19. Thoracolumbar spinal fractures : segmental range of motion after dorsal spondylodesis in 82 patients: a prospective study

    NARCIS (Netherlands)

    Leferink, VJM; Nijboer, JMM; Zimmerman, KW; Veldhuis, EFM; ten Vergert, EM; ten Duis, HJ

    2002-01-01

    In order to study the effect of dorsal spondylodesis on intervertebral movement in patients treated for thoracolumbar fractures, we measured the sagittal range of motion (ROM) in the segments above and below the fractured vertebral body 2 years after operation. Between 1991 and 1996, 82 consecutive

  20. Vertebral body or intervertebral disc wedging: which contributes more to thoracolumbar kyphosis in ankylosing spondylitis patients?

    Science.gov (United States)

    Liu, Hao; Qian, Bang-Ping; Qiu, Yong; Wang, Yan; Wang, Bin; Yu, Yang; Zhu, Ze-Zhang

    2016-01-01

    Abstract Both vertebral body wedging and disc wedging are found in ankylosing spondylitis (AS) patients with thoracolumbar kyphosis. However, their relative contribution to thoracolumbar kyphosis is not fully understood. The objective of this study was to compare different contributions of vertebral and disc wedging to the thoracolumbar kyphosis in AS patients, and to analyze the relationship between the apical vertebral wedging angle and thoracolumbar kyphosis. From October 2009 to October 2013, a total of 59 consecutive AS patients with thoracolumbar kyphosis with a mean age of 38.1 years were recruited in this study. Based on global kyphosis (GK), 26 patients with GK < 70° were assigned to group A, and the other 33 patients with GK ≥ 70° were included in group B. Each GK was divided into disc wedge angles and vertebral wedge angles. The wedging angle of each disc and vertebra comprising the thoracolumbar kyphosis was measured, and the proportion of the wedging angle to the GK was calculated accordingly. Intergroup and intragroup comparisons were subsequently performed to investigate the different contributions of disc and vertebra to the GK. The correlation between the apical vertebral wedging angle and GK was calculated by Pearson correlation analysis. The duration of disease and sex were also recorded in this study. With respect to the mean disease duration, significant difference was observed between the two groups (P < 0.01). The wedging angle and wedging percentage of discs were significantly higher than those of vertebrae in group A (34.8° ± 2.5° vs 26.7° ± 2.7°, P < 0.01 and 56.6% vs 43.4%, P < 0.01), whereas disc wedging and disc wedging percentage were significantly lower than vertebrae in group B (37.6° ± 7.0° vs 50.1° ± 5.1°, P < 0.01 and 42.7% vs 57.3%, P < 0.01). The wedging of vertebrae was significantly higher in group B than in group A (50.1° ± 5.1° vs 26.7° ± 2.7°, P < 0

  1. The influence of the intervertebral disc on stress distribution of the thoracolumbar vertebrae under destructive load

    Institute of Scientific and Technical Information of China (English)

    刘雷; 裴福兴; 宋跃明; 邹力; 张聪; 周宗科

    2002-01-01

    Objective: To compare the influence of normal and degenerative discs on stress distribution of the thoracolumbar vertebrae under destructive load, explore the biomechanical background and clinical meaning and provide theoretical basis for clinical diagnosis and treatment.Methods: A mechanical model of thoracolumbar motion segment of normal and degenerative discs was built with a three dimensional finite element method and three stresses of vertical compression, compressive flexion and distractive flexion were comparatively analyzed.Results: With vertical compression and compressive flexion loads, the thoracolumbar motion segment of the normal disc showed that the central part of the upper and lower end-plates of the vertebrae and the central part of the trabecular bone adjacent to the end-plate were loaded with the most intensive stresses, meanwhile, the postero-lateral part of the annulus fibrosus was concentrated with stresses. Degenerative disc showed that the stress distribution of the trabecular bone was relatively averaged, the stresses of the central part adjacent to the end-plate were low, while at the same time, the stresses of the peripheral part were elevated relatively. With distraction flexion load, the stresses of the cortex bone, trabecular bone, end-plate and annulus fibrosus of the thoracolumbar vertebrae of degenerative discs were low, meanwhile, the stresses of the posterior structure of the vertebral body were relatively elevated compared with that of normal discs.Conclusions: There is difference in influence between normal and degenerative discs on the stress distribution of the thoracolumbar vertebrae with destructive load. The transferring way of load is changed after disc degeneration.

  2. The influence of the interertebral disc on stress distribution of the thoracolumbar vertebrae under destructive load

    Institute of Scientific and Technical Information of China (English)

    刘雷; 裴福兴; 等

    2002-01-01

    Objectie:To compare the influence of normal and degenerative discs on stress distribution of the thoracolumbar vertebrae under destructive load,explore the biomechanical background and clinical meaning and provide theoretical basis for clinical diagnosis and treatment.Methods:A mechanical model of thoracolumbar motion segment of normal and degenerative discs was built with a three dimensional finite element method and three stresses of vertical compression,compressive flexion and distractive flexion were comparatively analyzed.Results:With vertical compression and compressive flexion loads,the thoracolumbar motion segment of the normal disc showed that the central part of the upper and lower end-plates of the vertebrae and the central part of the trabecular bone adjacent to the end-plate were lgaded with the most intensive stresses,meanwhile,the postero-lateral part of the annulus fibrosus was concentrated with stresses.Degeneratie disc showed that the stress distribution of the trabecular bone was relatively averaged,the stresses of the central part adjacent to the end-plate were low,while at the same time,the stresses of the peripheral part were elevated relatively.With distraction flexion load,the stresses of the cortex bone,trabecular bone,end-plate and annulus fibrosus of the thoracolumbar vertebrae of degenerative discs were low,neanwhile,the stresses of the posterior structure of the vertebral body were relatively elevated compared with that of normal discs.Conclusions:There is difference in influence between normal and degen erative discs on the stress distribution of the thoracolumbar vertebrae with destructive load.The transferring way of load is changed after disc degeneration.

  3. Can implant removal restore mobility after fracture of the thoracolumbar segment?

    Science.gov (United States)

    Axelsson, Paul; Strömqvist, Björn

    2016-10-01

    Background and purpose - Randomized trials have found that treating spinal burst fractures with reduction and posterior fixation is adequate without the use of bone grafting for definitive fusion. Restitution of intervertebral mobility of such an unfused segment after fracture healing may unload the adjacent parts of the spine and reduce the risk of degeneration of these segments. We used radiostereometry (RSA) to study whether late implant removal would restore the intervertebral mobility of a thoracolumbar segment treated with posterior instrumentation but no bone grafting for unstable spinal fracture. Patients and methods - We identified 7 patients with implant-related back pain at least 1.5 years after a thoracolumbar fracture (Th12 or L1) treated with reduction and posterior instrumentation. The implants were removed and tantalum indicators for RSA were inserted. 3 months later, each patient was examined with RSA. The intervertebral translations and rotations of the thoracolumbar segment, induced by change in position from flexion to extension, were measured. Progressive deformity was registered by conventional radiography and the overall clinical outcome was assessed by the patients. Results - According to RSA, all 7 patients regained some mobility of the fractured thoracolumbar segment. In 1 patient who was primarily treated for a flexion-distraction type of injury, conventional radiography revealed a progressive kyphotic deformity 3 months after implant removal and the clinical outcome was poor. According to the patients, 1 had a fair clinical outcome and 5 had good outcome. Interpretation - Late implant removal may restore segmental mobility after posterior fracture fixation of the thoracolumbar segment if bone grafting has not been used. The clinical consequences, positive or negative, of the residual mobility demonstrated in our small number of patients should be evaluated in studies based on extended patient series and with different fracture types

  4. Fracture behavior of short circumferentially surface-cracked pipe

    Energy Technology Data Exchange (ETDEWEB)

    Krishnaswamy, P.; Scott, P.; Mohan, R. [Battelle, Columbus, OH (United States)] [and others

    1995-11-01

    This topical report summarizes the work performed for the Nuclear Regulatory Comniission`s (NRC) research program entitled ``Short Cracks in Piping and Piping Welds`` that specifically focuses on pipes with short, circumferential surface cracks. The following details are provided in this report: (i) material property deteminations, (ii) pipe fracture experiments, (iii) development, modification and validation of fracture analysis methods, and (iv) impact of this work on the ASME Section XI Flaw Evaluation Procedures. The material properties developed and used in the analysis of the experiments are included in this report and have been implemented into the NRC`s PIFRAC database. Six full-scale pipe experiments were conducted during this program. The analyses methods reported here fall into three categories (i) limit-load approaches, (ii) design criteria, and (iii) elastic-plastic fracture methods. These methods were evaluated by comparing the analytical predictions with experimental data. The results, using 44 pipe experiments from this and other programs, showed that the SC.TNP1 and DPZP analyses were the most accurate in predicting maximum load. New Z-factors were developed using these methods. These are being considered for updating the ASME Section XI criteria.

  5. Exoscope Update: Automated Laser Welding Of Circumferential Tissue Anastomoses

    Science.gov (United States)

    Sauer, Jude S.; McGuire, Kevin P.; Hinshaw, J. Raymond

    1989-09-01

    The speed, accuracy and efficiency of using laser energy to fuse together or weld living tissue makes laser tissue welding one of the most exciting areas of medical research today. Numerous investigators using animal models and several surgeons conducting clinical studies have demonstrated many promising potential applications of laser tissue welding. Accurate tissue positioning and well controlled delivery of laser energy during laser welding are essential for consistently successful laser tissue repairs. Many surgical procedures involve the creation of functional anastomoses, which are patent connections between hollow, tubular tissue structures, like bowel, blood vessels or fallopian tubes. We are developing the Exoscope SystemTM to automate and simplify the production of laser welded end-to-end and end-to-side anastomoses. Any laser light that can be passed through an optical fiber can be used in this system. The Exoscope SystemTM employs a fiber optic Exoscope Device,TM which provides for the precise placement of laser energy onto the abutted tissue seam, and a biocompatible, dissolvable intraluminal PolySurgeTM stent, which holds the tissue in circumferential apposition during lasing. The feasibility of employing the Exoscope SystemTM technique for the construction of rabbit small bowel anastomoses was successfully demonstrated in a Phase I study comparing 30 Exoscope SystemTM laser welded anastomoses to 30 conventional sutured anastomoses.

  6. Via de acesso para exposição ampla da coluna toracolombar anterior (T10 -L5 Extensive anterior approach to the thoracolumbar spine (T10 -L5

    Directory of Open Access Journals (Sweden)

    Roberto Augusto Caffaro

    1998-08-01

    Full Text Available Os autores descrevem técnica de via de acesso para exposição ampla da coluna toracolombar anterior (T10 -L5 a que foi submetida uma série de cem pacientes com indicação cirúrgica para correção de diversas doenças da coluna. A partir das estruturas envolvidas, são analisados e comentados os tempos operatórios pertinentes bem como as complicações transoperatórias e pós-operatórias decorrentes da técnica. Sugere-se que a técnica de acesso proposta seja utilizada quando adequada à doença a cuja correção se destina, independente da área de comprometimento clinicamente objetivada.The authors describe a technique for extensive anterior approach to the thoracolumbar spine (T10 -L5, to which 100 patients with surgical indication for correcting orthopedic anomalies were submitted. The anatomical structures involved in surgical procedures are analyzed and discussed. Results have shown that this extensive anterior approach to the thoracolumbar spine a allows the aimed approach in 100% for the cases, making easier the arthopedic management necessary to the correction of the spine deformity to be treated; b makes possible to avoid transoperative complications from the knowledge of anatomical structures exposed in the surgical field, except for the sympathetic trunk, in which lesion can occur in 70% of cases; and c presents a low rate (2% of post operative complications. It is suggested that this technique for extensive anterior approach to the thoracolumbar spine should be used, independently of the extension of the clinically diagnosed affected area.

  7. Effect of strength matching on the reliability of welded pipe with circumferential surface crack

    Institute of Scientific and Technical Information of China (English)

    何柏林; 于影霞; 霍立兴; 张玉凤

    2004-01-01

    For different strength matching, the reliability index and failure probability of welded pressure pipe with circumferential surface crack were calculated using three dimensional stochastic finite element method. This method has overcome the shortcomings of conservative results in safety assessment with deterministic fracture mechanics method. The effects of external moment and the depth of the circumferential surface crack (a) on the reliability of pressure pipe were also calculated and discussed. The calculation results indicate that the strength matching has certain effect on the reliability of the welded pressure pipe with circumferential surface crack. The failure probability of welded pressure pipe with high strength matching is lower than that with low strength matching at the same conditions. The effects of strength matching on the failure probability and reliability index increased by adding external moment (M) and the depth of the circumferential surface crack (a).

  8. ISSLS prize winner: cost-effectiveness of two forms of circumferential lumbar fusion

    DEFF Research Database (Denmark)

    Freeman, Brian J C; Steele, Nicholas A; Sach, Tracey H;

    2007-01-01

    STUDY DESIGN: Economic evaluation alongside a prospective, randomized controlled trial from a secondary care National Health Service (NHS) perspective. OBJECTIVE: To determine the cost-effectiveness of titanium cages (TC) compared with femoral ring allografts (FRA) in circumferential lumbar spina...

  9. Circumferential Propagation of Tip Leakage Flow Unsteadiness for a Low-Speed Axial Compressor

    Institute of Scientific and Technical Information of China (English)

    Shaojuan Geng; Feng Lin; Jingyi Chen; Hongwu Zhang; Lei He

    2009-01-01

    ase shift propagating at about half of rotor rotation speed. Features of the short and long length-scale circum-ferential waves are similar to those of rotating instability and modal wave, respectively.

  10. Variation in circumferential resection margin: Reporting and involvement in the South-Netherlands

    NARCIS (Netherlands)

    Homan, J.; Bokkerink, G.M.J.; Aarts, M.J.; Lemmens, V.E.; Lijnschoten, G. van; Rutten, H.J.; Wijsman, J.H.; Nagtegaal, I.D.; Wilt, J.H.W. de

    2015-01-01

    BACKGROUND: Since the introduction of total mesorectal surgery the outcome of rectal cancer patients has improved significantly. Involvement of the circumferential resection margin (CRM) is an important predictor of increased local recurrence, distant metastases and decreased overall survival. Abdom

  11. Reduced Circumferential Resection Margin Involvement in Rectal Cancer Surgery: Results of the Dutch Surgical Colorectal Audit

    NARCIS (Netherlands)

    Gietelink, L.; Wouters, M.W.; Tanis, P.J.; Deken, M.M.; Berge, M.G. Ten; Tollenaar, R.A.; Krieken, J.H.J.M. van; Noo, M.E. de

    2015-01-01

    BACKGROUND: The circumferential resection margin (CRM) is a significant prognostic factor for local recurrence, distant metastasis, and survival after rectal cancer surgery. Therefore, availability of this parameter is essential. Although the Dutch total mesorectal excision trial raised awareness ab

  12. Effect of surface contamination on osseointegration of dental implants surrounded by circumferential bone defects.

    LENUS (Irish Health Repository)

    Mohamed, Seif

    2010-05-01

    This study was designed to evaluate the effect of surface contamination on osseointegration of dental implants surrounded by a circumferential bone defect and to compare osseointegration around Osseotite with that around Nanotite implants.

  13. Soft Sensor for Oxide Scales on the Steam Side of Superheater Tubes under Uneven Circumferential Load

    OpenAIRE

    Qing Wei Li; Gui Huan Yao

    2015-01-01

    A soft sensor for oxide scales on the steam side of superheater tubes of utility boiler under uneven circumferential loading is proposed for the first time. First finite volume method is employed to simulate oxide scales growth temperature on the steam side of superheater tube. Then appropriate time and spatial intervals are selected to calculate oxide scales thickness along the circumferential direction. On the basis of the oxide scale thickness, the stress of oxide scales is calculated by t...

  14. Understanding the link between circumferential dikes and eruptive fissures around calderas based on numerical and analog models

    Science.gov (United States)

    Corbi, Fabio; Rivalta, Eleonora; Pinel, Virginie; Maccaferri, Francesco; Acocella, Valerio

    2016-06-01

    Active calderas are seldom associated with circumferential eruptive fissures, but eroded magmatic complexes reveal widespread circumferential dikes. This suggests that, while the conditions to emplace circumferential dikes are easily met, mechanisms must prevent them from reaching the surface. We explain this discrepancy with experiments of air injection into gelatin shaped as a volcano with caldera. Analog dikes show variable deflection, depending on the competition between overpressure, Pe, and topographic unloading, Pl; when Pl/Pe = 4.8-5.3, the dikes propagate orthogonal to the least compressive stress. Due to the unloading, they become circumferential and stall below the caldera rim; buoyancy is fundamental for the further rise and circumferential fissure development. Numerical models quantitatively constrain the stress orientation within the gelatin, explaining the observed circumferential dikes. Our results explain how dikes propagate below the rim of felsic and mafic calderas, but only in the latter they are prone to feed circumferential fissures.

  15. TREATMENT OF THORACOLUMBAR BURST FRACTURES FIXED WITH INTERMEDIATE PINS BY THE POSTERIOR APPROACH

    Directory of Open Access Journals (Sweden)

    Henrique Motizuki

    2015-09-01

    Full Text Available Objective:Radiographic evaluation of patients with thoracolumbar burst fractures treated with unconvencional transpedicular fixation, which includes additional fixation of the fractured vertebra associated with transverse connector - Crosslink clamp.Methods:Retrospective study evaluating a total of 68 patients operated at the Hospital do Trabalhador de Curitiba, Orthopedics Service, of which 15 were eligible for the study. All patients were treated with posterior pedicle fixation and intermediate screw. The assessment by the Cobb angle method was performed on preoperative, immediate postoperative and one year after surgery radiographs.Results:It was observed an average reduction of kyphosis of 8.3o (77%, with a loss of 1.34o in late postoperative compared to the immediate postoperative period.Conclusion:The method of fixation of burst-type fractures of the thoracolumbar spine by the posterior approach with intermediate screw was effective in maintaining the reduction achieved in the immediate postoperative period and after one year of evolution.

  16. MR imaging in the assessment of the thoracolumbar spine in elite male gymnasts

    International Nuclear Information System (INIS)

    Gymnasts training on elite level from childhood to adulthood might do serious damage to the motion segments in the thoracolumbar spine. This paper reports on twenty-five elite gymnasts (age range, 18-29 years) investigated with 0.5-T MR imaging and compared with 17 aged-matched normal males. A significantly higher number of changes in configuration of the vertebrae, apophyseal changes, end plate nodes, degenerated disks, and disk bulging in the thoracolumbar spine were found among the gymnasts. The number of degenerated disks among the gymnasts were comparable to that found at the age group of 65. Disk degeneration and change of configuration of the vertebrae were also found to correlate significantly with symptoms of back pain

  17. Analyses of axial, lateral and circumferential deformations of rock specimen in triaxial compression

    Institute of Scientific and Technical Information of China (English)

    WANG Xue-bin

    2008-01-01

    The axial, lateral and circumferential strains were analyzed for a rock specimen subjected to shear failure in the form of a shear band bisecting the specimen in triaxial compression. Plastic deformation of the specimen stemmed from shear strain localization initiated at the peak shear stress. Beyond the onset of strain localization, the axial, lateral and circumferential strains were decomposed into two parts, respectively. One is the elas-tic strain described by general Hooke's law. The other is attributable to the plastic shear slips along shear band with a certain thickness dependent on the internal length of rock.The post-peak circumferential strain-axial strain curve of longer specimen is steeper than that of shorter specimen, as is consistent with the previous experiments. In elastic stage,the circumferential strain-axial strain curve exhibits nonlinear characteristic, as is in agreement with the previous experiment since confining pressure is loaded progressively until a certain value is reached. When the confining pressure is loaded completely, the circumferential strain-axial strain curve is linear in elastic and strain-softening stages. The predicted circumferential strain-axial strain curve in elastic and strain- softening stages agrees with the previous experiment.

  18. Pre-operative digital design for osteotomy and intra-operative navigation for treatment of secondary thoracolumbar kyphosis following surgery of thoracolumbar fracture%术前数字化截骨设计及术中导航辅助技术矫正胸腰段骨折术后继发角状后凸畸形

    Institute of Scientific and Technical Information of China (English)

    樊勇; 吴子祥; 杨红军; 漆伟; 雷伟; 裴彦军; 裴国献; 桑宏勋

    2015-01-01

    Objective To evaluate the efficacy of pre-operative digital design for osteotomy and intra-operative navigation for treatment of secondary thoracolumbar kyphosis following surgery of thoracolumbar fracture.Methods Thirty-four patients with secondary thoracolumbar kyphosis following surgery of thoracolumbar fracture were treated with pedicle subtraction osteotomy (PSO) from January 2008 to April 2013.They were 18 men and 16 women,from 17 to 44 years of age (average,26.5 years).Of them,11 received traditional posterior osteotomy (unassisted group) and 23 received preoperative design with Mimics software and intraoperative navigation (assisted group).The 2 groups were compared in terms of operation time,blood loss,local deformity correction rate,cobb angle,visual analogue scale (VAS),and Oswestry disability index (ODI).Results The assisted group bad significantly shorter operation time,less blood loss and a higher deformity correction rate than the unassisted group (P < 0.05).All patients were followed up for a mean duration of 38 months (from 6 to 51 months).In all patients,the preoperative cobb angle,VAS and ODI scores were significantly improved at postoperation and the last follow-up (P < 0.05).At the last follow-up,the cobb angle,VAS and ODI scores in the assisted group were significantly better than in the unassisted group (P < 0.05).In all the patients,rigid fusion of the spinal vertebrae fixated was achieved,no implant failure occurred,the secondary thoracolumbar kyphosis was obviously corrected,and back pain disappeared.Conclusion The pre-operative digital design for osteotomy and intra-operative navigation improve the safety of PSO,therapeutic outcomes and local deformity correction for treatment of secondaU thoracolumbar kyphosis following surgery of thoracolumbar fracture.%目的 探讨联合应用术前数字化截骨设计和术中导航技术辅助矫正胸腰段骨折术后继发角状后凸畸形的有效性. 方法 2008年1至201 3年4月对34

  19. Monosegmental fixation for the treatment of fractures of the thoracolumbar spine

    Directory of Open Access Journals (Sweden)

    Defino Helton

    2007-01-01

    Full Text Available Background : A short vertebral arthrodesis has been one of the objectives of the surgical treatment of fractures of the thoracolumbar spine. We present here clinical, functional and radiographic outcome obtained after monosegmental fixation (single posterior or combined anterior and posterior of specific types of unstable thoracolumbar fractures. Materials and Methods : Twenty four patients with fractures of the thoracolumbar spine submitted to monosegmental surgical treatment (Group I - 18 single posterior monosegmental fixations and Group II - 6 combined anterior and posterior fixations were retrospectively evaluated according to clinical, radiographic and functional parameters. The indication for surgery was instability or neurological deficit. All the procedures were indicated and performed by the senior surgeon (Helton LA Defino. Results : The patients from group I were followed-up from 2 to 12 years (mean: 6.65±2.96. The clinical, functional and radiographic results show that a single posterior monosegmental fixation is adequate and a satisfactory procedure to be used in specific types of thoracolumbar spine fractures, The patients from group II were followed-up from 9 to 15 years (mean: 13 ± 2,09 years. On group II the results of clinical evaluation showed moderate indices of residual pain and of satisfaction with the final result. The values obtained by functional evaluation showed that 66.6% of the patients were unable to return to their previous job and presented a moderate disability index (Oswestry = 16.6 and a significant reduction of quality of life based on the SF-36 questionnaire. Radiographic evaluation showed increased kyphosis of the fixed vertebral segment during the late postoperative period, accompanied by a reduction of the height of the intervertebral disk. Conclusion : It is possible to stabilize the fractures which have an anterior good load-bearing capacity by a standalone posterior monosegmental fixation. However

  20. Incidence of Vascular Complications Arising from Anterior Spinal Surgery in the Thoraco-Lumbar Spine

    OpenAIRE

    Klezl, Zdenek; Swamy, Girish Nanjunda; Vyskocil, Thomas; Kryl, Jan; Stulik, Jan

    2014-01-01

    Study Design Modern biomaterials and instrumentation have popularised surgery of the thoraco-lumbar spine through an anterior route. The advantage of anterior surgery is that it allows for a direct decompression of the compromised spinal canal. However, the potential for devastating long-term sequelae as a result of complications is high. Purpose The aim of this study was to give a general overview and identify the incidence of vascular complications. Overview of Literature There is limited l...

  1. Morphometrical dimensions of the sheep thoracolumbar vertebrae as seen on digitised CT images.

    Science.gov (United States)

    Mageed, Mahmoud; Berner, Dagmar; Jülke, Henriette; Hohaus, Christian; Brehm, Walter; Gerlach, Kerstin

    2013-09-01

    The sheep spine is widely used as a model for preclinical research in human medicine to test new spinal implants and surgical procedures. Therefore, precise morphometric data are needed. The present study aimed to provide computed tomographic (CT) morphometry of sheep thoracolumbar spine. Five adult normal Merino sheep were included in this study. Sheep were anaesthetised and positioned in sternal recumbency. Subsequently, transverse and sagittal images were obtained using a multi-detector-row helical CT scanner. Measurements of the vertebral bodies, pedicles, intervertebral disc and transverse processes were performed with dedicated software. Vertebral bodies and the spinal canal were wider than they were deep, most obviously in the lumbar vertebrae. The intervertebral discs were as much as 57.4% thicker in the lumbar than in the thoracic spine. The pedicles were higher and longer than they were wide over the entire thoracolumbar spine. In conclusion, the generated data can serve as a CT reference for the ovine thoracolumbar spine and may be helpful in using sheep spine as a model for human spinal research.

  2. Single-stage Posterior Spondylectomy,Circumferential Decompression and Reconstruction Using Mesh Cage for Spinal Tumors

    Institute of Scientific and Technical Information of China (English)

    Yong Zhu; Hong Zhao; Giu-xing Qiu; Jian-guo Zhang; Ye Tian; Shu-gang Li; Suo-mao Yuan

    2009-01-01

    Objective To explore the feasibility and clinical results of circumferential decompression and threecolumn reconstruction through single-stage posterior transpedicular approach for spinal tumor treatment.Methods Totally,24 patients with spinal tumor underwent tumor resection and spinal reconstruction through single-stage posterior transpedicular approach.Preoperatively,according to the Frankel classification,12 patients were grade E,9 grade D,and 3 grade C.Anterior column was reconstructed with non-expandable titanium cages.Posterior segmental instrumentation was used to maintain the stability of spine in all cases.Anterior and posterolateral fusion was performed with autograft and allogenic bone.The following data were followed up in these patients:deformity angle,local recurrence,neurological function,and spinal bony fusion.Results The average operating time and blood loss was 5.6 hours and 3 400 ml respectively.No intraoperative and postoperative complications were observed in this group.Postoperatively,21 patients were Frankel grade E,2 grade D,and 1 grade C.Four patients reported significant functional restoration and twenty patients reported complete resolution of pain.At follow-up(range,6-42 months),implant failure or recurrent neurological symptoms was not found.Conclusions The tumor resection and spinal reconstruction through single-stage posterior transpedicular approach is a safe and effective technique for the treatment of spinal tumor.It can fully decompress the neurological structures,correct the kyphosis,and achieve early weight-bearing.This technique can improve life quality for the patients with spinal tumor.

  3. Circumspinal decompression through a single posterior incision to treat thoracolumbar disc herniation

    Institute of Scientific and Technical Information of China (English)

    QI Qiang; SUN Chui-guo; CHEN Zhong-qiang; LIU Ning; GUO Zhao-qing; SHI Ze-feng; LIU Zhong-jun; LIU Xiao-guang; LI Wei-shi; ZENG Yan

    2011-01-01

    Background Various surgical approaches have been successfully used in the treatment of thoracolumbar disc herniation (TLDH).Although the anterior transthoracic approach has a reputation for better visualization than the posterolateral and lateral approaches,it involves the manipulation of the thoracic and pulmonary structures.Thus,this approach is technically demanding and prone to compromising the respiratory system.An ideal approach would involve adequate visualization and be accomplished through the posterior midline approach that is familiar to spine surgeons.The objective of this retrospective preliminary clinical study was to introduce a new surgical procedure,circumspinal decompression through a single posterior incision,for the treatment of TLDH (T10/11-L1/2) and to evaluate the surgical outcome of this procedure by comparing it to the conventional anterior transthoracic approach.Methods In this study,15 patients (10 males,5 females; mean age 51 years) with symptomatic TLDH underwent the circumspinal decompression through a single posterior incision procedure between January 2008 and December 2009.Altogether,17 herniated discs were excised,with 2 discs at T10/11,4 discs at T11/12,5 discs at T12/L1 and 6 discs at L1/2.Of these patients,13 were followed up with a mean follow-up period of 23.5 months.Clinical outcomes,including operative time,blood loss,perioperative complications,postoperative time of hospitalization,neurologic status improvement,back pain and correction of local kyphosis,were investigated by comparing these data with the results from patients who underwent the anterior transthoracic approach for TLDH during the same period.The patients' neurologic status was evaluated by a modified Japanese Orthopedic Association (JOA) scoring system of 11 points.Neurologic status improvement after the surgery was assessed by calculating the recovery rate,which was equal to the (postoperative JOA score-preoperative JOA score)/(11-preoperative JOA score)x100

  4. Surgical treatment in thoraco-lumbar region fractures. Tratamiento quirúrgico de las fracturas de columna en la región toracolumbar

    Directory of Open Access Journals (Sweden)

    Yoan Manuel Quiñones González

    2008-06-01

    Full Text Available Background: thoraco-lumbar fractures may affect people at any moment of their lives, especially at their most fruitful and useful stage. Its correct diagnosis and treatment may directly influence in the posterior evolution of the patients. Objectives: to evaluate the results of the surgical treatment in thoraco-lumbar region fractures. Methods: a descriptive retrospective correlational study of series cases which included 54 patients attended due to thoraco-lumbar region fractures in the University Hospital “Dr. Gustavo Aldereguía Lima” in Cienfuegos city, Cuba from January 1999 to June 2007. Age, sex, etiology of the fracture, type and level of the fractures, associated diseases, surgical techniques used for, pre and post operatory neurological damage, usage of metilprednisolone, complications and final results were the variables taken into consideration in this study. Results: most of the patients belonged to male sex under the age of 45. The totality of the cases had type IV fracture, and a great part of them had Denis type II fracture having surgical treatment. The causes of the lesions were traffic accidents, working accidents and height falls. The most useful surgical techniques were posterior decompression, instrumentation and fusion. Surgery improved the neurological damage in almost half of sick patients with this condition. Complications were minimum and rupture of the implant was predominant. Conclusion: surgical treatment in thoraco-lumbar region fractures had satisfactory results in our milieu.
    Fundamento: Las fracturas de columna vertebral pueden afectar a las personas en cualquier momento de su vida, especialmente en la etapa más útil y fructífera. Su correcto diagnóstico y tratamiento influyen directamente en la posterior evolución de los pacientes. Objetivo: Evaluar los resultados del

  5. Accelerated circumferential strain quantification of the left ventricle using CIRCOME: simulation and factor analysis

    Science.gov (United States)

    Moghaddam, Abbas N.; Finn, J. Paul

    2008-03-01

    Circumferential strain of the left ventricle reflects myocardial contractility and is considered a key index of cardiac function. It is also an important parameter in the quantitative evaluation of heart failure. Circumferential compression encoding, CIRCOME, is a novel method in cardiac MRI to evaluate this strain non-invasively and quickly. This strain encoding technique avoids the explicit measurement of the displacement field and does not require calculation of strain through spatial differentiation. CIRCOME bypasses these two time-consuming and noise sensitive steps by directly using the frequency domain (k-space) information from radially tagged myocardium, before and after deformation. It uses the ring-shaped crown region of the k-space, generated by the taglines, to reconstruct circumferentially compression-weighted images of the heart before and after deformation. CIRCOME then calculates the circumferential strain through relative changes in the compression level of corresponding regions before and after deformation. This technique can be implemented in 3D as well as 2D and may be employed to estimate the overall global or regional circumferential strain. The main parameters that affect the accuracy of this method are spatial resolution, signal to noise ratio, eccentricity of the center of radial taglines their fading and their density. Also, a variety of possible image reconstruction and filtering options may influence the accuracy of the method. This study describes the pulse sequence, algorithm, influencing factors and limiting criteria for CIRCOME and provides the simulated results.

  6. Numerical investigation of a centrifugal compressor with circumferential grooves in vane diffuser

    Science.gov (United States)

    Chen, X. F.; Qin, G. L.; Ai, Z. J.

    2015-08-01

    Enhancing stall and surge margin has a great importance for the development of turbo compressors. The application of casing treatment is an effective measure to expand the stall margin and stable operation range. Numerical investigations were conducted to predict the performance of a low flow rate centrifugal compressor with circumferential groove casing treatment in vane diffuser. Numerical cases with different radial location, radial width and axial depth of a circumferential single groove and different numbers of circumferential grooves were carried out to compare the results. The CFD analyses results show that the centrifugal compressor with circumferential grooves in diffuser can extend stable range by about 9% while the efficiency over the whole operating range decreases by 0.2 to 1.7%. The evaluation based on stall margin improvement showed the optimal position for the groove to be located was indicated to exist near the leading edge of the diffuser, and a combination of position, width, depth and numbers of circumferential grooves that will maximize both surge margin range and efficiency.

  7. Transverse plane pelvic rotation increase (TPPRI following rotationally corrective instrumentation of adolescent idiopathic scoliosis double curves

    Directory of Open Access Journals (Sweden)

    Asher Marc A

    2010-08-01

    Full Text Available Abstract Background We have occasionally observed clinically noticeable postoperative transverse plane pelvic rotation increase (TPPRI in the direction of direct thoracolumbar/lumbar rotational corrective load applied during posterior instrumentation and arthrodesis for double (Lenke 3 and 6 adolescent idiopathic scoliosis (AIS curves. Our purposes were to document this occurrence; identify its frequency, associated variables, and natural history; and determine its effect upon patient outcome. Methods Transverse plane pelvic rotation (TPPR can be quantified using the left/right hemipelvis width ratio as measured on standing posterior-anterior scoliosis radiographs. Descriptive statistics were done to determine means and standard deviations. Non-parametric statistical tests were used due to the small sample size and non-normally distributed data. Significance was set at P Results Seventeen of 21 (81% consecutive patients with double curves (7 with Lenke 3 curves and 10 with Lenke 6 instrumented with lumbar pedicle screw anchors to achieve direct rotation had a complete sequence of measurable radiographs. While 10 of these 17 had no postoperative TPPRI, 7 did all in the direction of the rotationally corrective thoracolumbar instrumentation load. Two preoperative variables were associated with postoperative TPPRI: more tilt of the vertebra below the lower instrumented vertebra (-23° ± 3.1° vs. -29° ± 4.6°, P = 0.014 and concurrent anterior thoracolumbar discectomy and arthrodesis (5 of 10 vs. 7 of 7, P = 0.044. Patients with a larger thoracolumbar/lumbar angle of trunk inclination or larger lower instrumented vertebra plus one to sacrum fractional/hemicurve were more likely to have received additional anterior thoracolumbar discectomy and arthrodesis (c = 0.90 and c = 0.833, respectively. Postoperative TPPRI resolved in 5 of the 7 by intermediate follow-up at 12 months. Patient outcome was not adversely affected by postoperative TPPRI

  8. Treatment of thoraco-lumbar curves in adolescent females affected by idiopathic scoliosis with a progressive action short brace (PASB: assessment of results according to the SRS committee on bracing and nonoperative management standardization criteria

    Directory of Open Access Journals (Sweden)

    Perisano Carlo

    2009-09-01

    Full Text Available Abstract Background The effectiveness of conservative treatment of scoliosis is controversial. Some studies suggest that brace is effective in stopping curve progression, whilst others did not report such an effect. The purpose of the present study was to effectiveness of Progressive Action Short Brace (PASB in the correction of thoraco-lumbar curves, in agreement with the Scoliosis Research Society (SRS Committee on Bracing and Nonoperative Management Standardisation Criteria. Methods Fifty adolescent females (mean age 11.8 ± 0.5 years with thoraco-lumbar curve and a pre-treatment Risser score ranging from 0 to 2 have been enrolled. The minimum duration of follow-up was 24 months (mean: 55.4 ± 44.5 months. Antero-posterior radiographs were used to estimate the curve magnitude (CM and the torsion of the apical vertebra (TA at 5 time points: beginning of treatment (t1, one year after the beginning of treatment (t2, intermediate time between t1 and t4 (t3, end of weaning (t4, 2-year minimum follow-up from t4 (t5. Three situations were distinguished: curve correction, curve stabilisation and curve progression. The Kruskal Wallis and Spearman Rank Correlation tests have been used as statistical tests. Results CM mean value was 29,30 ± 5,16 SD at t1 and 14,67 ± 7,65 SD at t5. TA was 12.70 ± 6,14 SD at t1 and 8,95 ± 5,82 at t5. The variation between measures of Cobb and Perdriolle degrees at t1,2,3,4,5 and between CM t5-t1 and TA t5-t1 were significantly different. Curve correction was accomplished in 94% of patients, whereas a curve stabilisation was obtained in 6% of patients. Conclusion The PASB, due to its peculiar biomechanical action on vertebral modelling, is highly effective in correcting thoraco-lumbar curves.

  9. Circumferential myocardial strain in cardiomyopathy with and without left bundle branch block

    Directory of Open Access Journals (Sweden)

    Zimetbaum Peter J

    2010-01-01

    Full Text Available Abstract Background Cardiac resynchronization therapy (CRT has been shown to decrease mortality in 60-70% of advanced heart failure patients with left bundle branch block (LBBB and QRS duration > 120 ms. There have been intense efforts to find reproducible non-invasive parameters to predict CRT response. We hypothesized that different left ventricular contraction patterns may exist in LBBB patients with depressed systolic function and applied tagged cardiovascular magnetic resonance (CMR to assess circumferential strain in this population. Methods We determined myocardial circumferential strain at the basal, mid, and apical ventricular level in 35 subjects (10 with ischemic cardiomyopathy, 15 with non-ischemic cardiomyopathy, and 10 healthy controls. Patterns of circumferential strain were analyzed. Time to peak systolic circumferential strain in each of the 6 segments in all three ventricular slices and the standard deviation of time to peak strain in the basal and mid ventricular slices were determined. Results Dyskinesis of the anterior septum and the inferior septum in at least two ventricular levels was seen in 50% (5 out of 10 of LBBB patients while 30% had isolated dyskinesis of the anteroseptum, and 20% had no dyskinesis in any segments, similar to all of the non-LBBB patients and healthy controls. Peak circumferential strain shortening was significantly reduced in all cardiomyopathy patients at the mid-ventricular level (LBBB 9 ± 6%, non-LBBB 10 ± 4% vs. healthy 19 ± 4%; both p Conclusions Septal dyskinesis exists in some patients with LBBB. Myocardial circumferential strain analysis enables detailed characterization of contraction patterns, strengths, and timing in cardiomyopathy patients with and without LBBB.

  10. A study on nondestructive evaluation techniques for composite motors cases using circumferential waves

    International Nuclear Information System (INIS)

    For structural integrity evaluation of composite rocket motor cases, acoustic emission (AE) during hydroproof test is currently used. For the suitable performance of this test, it is very important to determine the optimal component of elastic waves to be monitored. In this study, the optimal component of circumferential wave that propagate in the circumferential direction of the composite motor case has been determined experimentally. Then its potential to be served as a robust tool for nondestructive evaluation of composite motor cases was demonstrated by investigating the initial performances for flaw detection and AE source location.

  11. An analysis of the Circumferential Grooves Casing Treatment for transonic compressor flow

    Institute of Scientific and Technical Information of China (English)

    2010-01-01

    The stall mechanism of the NASA Rotor 37 is investigated through the analysis of the critical flow structures near the stall under the transonic condition. The performance of the rotor with Circumferential Grooves Casing Treatment (CGCT) is also studied based on the Reynolds-Averaging Navier-Stokes approach. The study finds that stall margin improvement can be achieved without significant penalty on the efficiency for the two CGCT configurations applied. The effects of circumferential grooves on the critical flow structures are studied through the analysis of the tip leakage mass and momentum transport that further re-veal the CGCT mechanism.

  12. Molecular Modeling of the Axial and Circumferential Elastic Moduli of Tubulin

    OpenAIRE

    Zeiger, A. S.; Layton, B. E.

    2008-01-01

    Microtubules play a number of important mechanical roles in almost all cell types in nearly all major phylogenetic trees. We have used a molecular mechanics approach to perform tensile tests on individual tubulin monomers and determined values for the axial and circumferential moduli for all currently known complete sequences. The axial elastic moduli, in vacuo, were found to be 1.25 GPa and 1.34 GPa for α- and β-bovine tubulin monomers. In the circumferential direction, these moduli were 378...

  13. Radiological diagnosis of chronic spinal cord compressive lesion at thoraco-lumbar junction

    Energy Technology Data Exchange (ETDEWEB)

    Koyanagi, Izumi; Isu, Toyohiko; Iwasaki, Yoshinobu; Akino, Minoru; Abe, Hiroshi; Tashiro, Kunio; Miyasaka, Kazuo; Abe, Satoru; Kaneda, Kiyoshi

    1988-10-01

    Radiological findings in five cases with chronic spinal cord compressive lesion at thoraco-lumbar junction were reported. Three cases had spondylosis and two cases had ossification of yellow ligament (OYL). The levels of the lesions were T12/L1 in three cases and T11/12 in two cases. Two out of three spondylotic patients had also OYL at the same level. The five cases consisted of three men and two women. The ages ranged from 42 to 60 years old with a mean age of 53 years old. Neurologically, every patient showed flaccid paresis and sensory disturbance of the legs. Two cases had sensory disturbance of stocking type. The intervals from the onset of the symptoms to the final diagnosis were 6 months, 7 years, 8 years, 11 years and 12 years. Myelography showed anterior spinal cord compression by bony spur in spondylotic patients, and posterior compression by OYL in other cases. Myelography in flexion posture disclosed the cord compression by bony spur more clearly in two out of three spondylotic patients. Delayed CT-myelography showed intramedullary filling of contrast material in two cases, which indicated degenerative change or microcavitation due to long term compression of the spinal cord. MRI was taken in three spondylotic patients and could directly show compression of the spinal cord. Difficulty in detecting abnormality at thoraco-lumbar junction on plain roentgenogram, and similarity of the symptoms to peripheral nerve disease often lead to a delay in diagnosis. The significance of dynamic myelography and delayed CT-myelography when dealing with such a lesion was discussed here. MRI is also a useful method for diagnosing a compressive lesion at the thoraco-lumbar junction.

  14. Decision-making in burst fractures of the thoracolumbar and lumbar spine

    Directory of Open Access Journals (Sweden)

    Heary Robert

    2007-01-01

    Full Text Available The most common site of injury to the spine is the thoracolumbar junction which is the mechanical transition junction between the rigid thoracic and the more flexible lumbar spine. The lumbar spine is another site which is more prone to injury. Absence of stabilizing articulations with the ribs, lordotic posture and more sagitally oriented facet joints are the most obvious explanations. Burst fractures of the spine account for 14% of all spinal injuries. Though common, thoracolumbar and lumbar burst fractures present a number of important treatment challenges. There has been substantial controversy related to the indications for nonoperative or operative management of these fractures. Disagreement also exists regarding the choice of the surgical approach. A large number of thoracolumbar and lumbar fractures can be treated conservatively while some fractures require surgery. Selecting an appropriate surgical option requires an in-depth understanding of the different methods of decompression, stabilization and/or fusion. Anterior surgery has the advantage of the greatest degree of canal decompression and offers the benefit of limiting the number of motion segments fused. These advantages come at the added cost of increased time for the surgery and the related morbidity of the surgical approach. Posterior surgery enjoys the advantage of being more familiar to the operating surgeons and can be an effective approach. However, the limitations of this approach include inadequate decompression, recurrence of the deformity and implant failure. Though many of the principles are the same, the treatment of low lumbar burst fractures requires some additional consideration due to the difficulty of approaching this region anteriorly. Avoiding complications of these surgeries are another important aspect and can be achieved by following an algorithmic approach to patient assessment, proper radiological examination and precision in decision-making regarding

  15. Thoracolumbar junction injuries after rollover crashes: difference between belted and unbelted front seat occupants

    OpenAIRE

    Inamasu, Joji; Guiot, Bernard H.

    2009-01-01

    Motor vehicle collision (MVC) is one of the most common causes of thoracolumbar junction (TLJ) injury. Although it is of no doubt that the use of seatbelt reduces the incidence and severity of MVC-induced TLJ injury, how it is protective for front-seat occupants of an automobile after rollover crashes is unclear. Among 200 consecutive patients with a major TLJ (Th11-L2) injury due to high-energy trauma admitted from 2000 to 2004, 22 patients were identified as front-seat occupants of a four-w...

  16. Development and Validation of a Musculoskeletal Model of the Fully Articulated Thoracolumbar Spine and Rib Cage.

    Science.gov (United States)

    Bruno, Alexander G; Bouxsein, Mary L; Anderson, Dennis E

    2015-08-01

    We developed and validated a fully articulated model of the thoracolumbar spine in opensim that includes the individual vertebrae, ribs, and sternum. To ensure trunk muscles in the model accurately represent muscles in vivo, we used a novel approach to adjust muscle cross-sectional area (CSA) and position using computed tomography (CT) scans of the trunk sampled from a community-based cohort. Model predictions of vertebral compressive loading and trunk muscle tension were highly correlated to previous in vivo measures of intradiscal pressure (IDP), vertebral loading from telemeterized implants and trunk muscle myoelectric activity recorded by electromyography (EMG). PMID:25901907

  17. Early recurrence of thoracolumbar intervertebral disc extrusion after surgical decompression: a report of three cases

    Directory of Open Access Journals (Sweden)

    Jäderlund Karin H

    2010-02-01

    Full Text Available Abstract Thoracolumbar disc extrusions were diagnosed in three chondrodystrophic dogs with paraparesis of up to three days duration. All cases were managed by hemilaminectomy and removal of extruded disc material. In one dog, fenestration of the herniated disc space was also performed. Initially neurological function improved or was unchanged, but from two to ten days postoperatively clinical signs of deterioration became apparent. In all the dogs, recurrence of disc extrusion at the same location as the initial extrusion was diagnosed by computer tomography and at a second surgery abundant disc material was found at the hemilaminectomy site between the dura and an implanted graft of autogenous fat.

  18. Determination of the minimum number exposures in radiographic examination of circumferential welds

    International Nuclear Information System (INIS)

    Certain specifications require that, in the radiography of circumferential welds, the penetrated thickness at the side of the beam should not exceed the wall thickness by more than a given percentage. A mathematical solution is presented, which shows the minimum number of exposures in accurate and easy-to-read diagrams suitable for use by field radiographers. (orig.)

  19. 46 CFR 52.05-45 - Circumferential joints in pipes, tubes and headers (modifies PW-41).

    Science.gov (United States)

    2010-10-01

    ..., tubes and headers shall be as required by PW-41 of section I of the ASME Boiler and Pressure Vessel Code... 46 Shipping 2 2010-10-01 2010-10-01 false Circumferential joints in pipes, tubes and headers...) MARINE ENGINEERING POWER BOILERS Requirements for Boilers Fabricated by Welding §...

  20. Circumferential optical coherence tomography angiography imaging of the swine esophagus using a micromotor balloon catheter.

    Science.gov (United States)

    Lee, Hsiang-Chieh; Ahsen, Osman Oguz; Liang, Kaicheng; Wang, Zhao; Cleveland, Cody; Booth, Lucas; Potsaid, Benjamin; Jayaraman, Vijaysekhar; Cable, Alex E; Mashimo, Hiroshi; Langer, Robert; Traverso, Giovanni; Fujimoto, James G

    2016-08-01

    We demonstrate a micromotor balloon imaging catheter for ultrahigh speed endoscopic optical coherence tomography (OCT) which provides wide area, circumferential structural and angiographic imaging of the esophagus without contrast agents. Using a 1310 nm MEMS tunable wavelength swept VCSEL light source, the system has a 1.2 MHz A-scan rate and ~8.5 µm axial resolution in tissue. The micromotor balloon catheter enables circumferential imaging of the esophagus at 240 frames per second (fps) with a ~30 µm (FWHM) spot size. Volumetric imaging is achieved by proximal pullback of the micromotor assembly within the balloon at 1.5 mm/sec. Volumetric data consisting of 4200 circumferential images of 5,000 A-scans each over a 2.6 cm length, covering a ~13 cm(2) area is acquired in <18 seconds. A non-rigid image registration algorithm is used to suppress motion artifacts from non-uniform rotational distortion (NURD), cardiac motion or respiration. En face OCT images at various depths can be generated. OCT angiography (OCTA) is computed using intensity decorrelation between sequential pairs of circumferential scans and enables three-dimensional visualization of vasculature. Wide area volumetric OCT and OCTA imaging of the swine esophagus in vivo is demonstrated.

  1. Optimization of the axial compressor flow passage to reduce the circumferential distortion

    Science.gov (United States)

    Popov, G.; Kolmakova, D.; Shklovets, A.; Ermakov, A.

    2015-08-01

    This work is motivated by the necessity to reduce the effects of the flow circumferential distortion in the flow passage of the aircraft gas turbine engine (GTE). In previous research, the authors have proposed the approaches to decrease of the flow circumferential distortion arising from the mid-support racks of GTE compressor and having a negative impact on the blade rows, located upstream. In particular, the idea of introducing the circumferentially non-uniform blade pitch and profile stagger angle of guide vanes located in front of the support was contributed in order to redistribute the flow and decrease the dynamic stresses in the rotor wheel of the same stage. During the research presented in this paper, another principal of reduction of the flow circumferential distortion was chosen. Firstly, the variants of upgrading the existing support racks were found. Secondly, the new design of support was offered. Both the first and the second version of the support design variation took into account the availability of technological and structural limitations associated with the location of oil pipes, springs and others elements in the support racks. Investigations of modified design showed that the support with altered racks provides a reduction of dynamic stresses by 20% at resonance with the most dangerous harmonic, and the new design of support can give the decrease of 30%.

  2. Conventional CT for the prediction of an involved circumferential resection margin in primary rectal cancer

    NARCIS (Netherlands)

    Wolberink, Steven V. R. C.; Beets-Tan, Regina G. H.; de Haas-Kock, Danielle F. M.; Span, Mark M.; van de Jagt, Eric J.; van de Velde, Cornelis J. H.; Wiggers, Theo

    2007-01-01

    Purpose: To determine the accuracy of conventional computed tomography (CT) scan in the preoperative prediction of an involved circumferential resection margin (CRM) in primary rectal cancer. Methods: 125 patients with biopsy-proven adenocarcinoma of the rectum underwent CT of the abdomen before und

  3. Consideration on evaluation of internal pressure creep rupture for tube with circumferential joint

    International Nuclear Information System (INIS)

    The behavior of internal pressure creep rupture of the thin-walled cylinders with circumferential joints is affected by the combination of creep characteristics of parent materials and weld metals. In particular, the compatibility of the creep strain rate of parent materials and weld metals becomes an important controlling factor. The behavior of internal pressure creep of the welded parts in circumferential joint cylinders can be evaluated simply with the uniaxial creep data of parent materials and weld metals, considering it by approximately substituting with the creep behavior of a uniaxial longitudinal joint. The method of evaluation is, first, to analyze the breaking behavior of uniaxial longitudinal joints using the uniaxial creep characteristic values of parent materials and weld metals, and next, by combining the equation for the relation between the rupture times of uniaxial creep and internal pressure creep with the analyzed breaking behavior of uniaxial joints, the internal pressure creep rupture behavior of the cylinders with circumferential joints can be evaluated. The internal pressure creep behavior of the thin-walled cylinders with circumferential joints, their rupture life and the uniaxial creep rupture life of longitudinal joints, and the examination of Hastelloy X cylinders are reported. (Kako, I.)

  4. Modification of the ASME code z-factor for circumferential surface crack in nuclear ferritic pipings

    International Nuclear Information System (INIS)

    The purpose of this paper is to modify the ASME Code Z-Factor, which is used in the evaluation of circumferential surface crack in nuclear ferritic pipings. The ASME Code Z-Factor is a load multiplier to compensate plastic load with elasto-plastic load. The current ASME Code Z-Factor underestimates pipe maximum load. In this study, the original SC. TNP method is modified first because the original SC. TNP method has a problem that the maximum allowable load predicted from the original SC. TNP method is slightly higher than that measured from the experiment. Then the new Z-Factor is developed using the modified SC. TNP method. The desirability of both the modified SC. TNP method and the new Z-Factor is examined using the experimental results for the circumferential surface crack in pipings. The results show that (1) the modified SC. TNP method is good for predicting the circumferential surface crack behavior in pipings, and (2) the Z-Factor obtained from the modified SC. TNP method well predicts the behavior of circumferential surface crack in ferritic pipings. 30 refs., 13 figs., 4 tabs. (author)

  5. Combined Anterior-Posterior Surgery Versus Posterior Surgery for Thoracolumbar Burst Fractures: A Systematic Review of the Literature

    NARCIS (Netherlands)

    P.P. Oprel (Pim); W.E. Tuinebreijer (Wim); P. Patka (Peter); D. den Hartog (Dennis)

    2010-01-01

    textabstractAbstract: Study Design: A systematic quantitative review of the literature. Objective: To compare combined anterior-posterior surgery versus posterior surgery for thoracolumbar fractures in order to identify better treatments. Summary of Background Data: Axial load of the anterior and mi

  6. Depression of the Thoracolumbar Posterior Vertebral Body on the Estimation of Cement Leakage in Vertebroplasty and Kyphoplasty Operations

    Directory of Open Access Journals (Sweden)

    Hao Chen

    2015-01-01

    Conclusions: Depression of the thoracolumbar posterior vertebral body may be informative for the estimation of cement location on C-arm images. To reduce type-B leakage, DCPW should be made longer than DBCV on C-arm images for safety during PVP or PKP.

  7. A method for measuring mean circumferential fiber shortening rate from gated blood pool scans

    International Nuclear Information System (INIS)

    Ejection fraction and ejection rate are easily obtained from gated cardiac images, but no method is available for calculating mean circumferential fiber shortening rate. We assumed that the cube root of left ventricular end-diastolic volume or counts is proportional to the minor axis of the left ventricle at end-diastole or end-systole. Mean circumferential fiber shortening rate is then equal to the [cube root of the end-diastolic volume (count) minus cube root of end-systolic volume (count)] divided by [cube root of end-diastolic volume (count) multiplied by the ejection time]. In 250 contrast ventriculograms, the standard mean circumferential fiber shortening rate (MCFSR) and that derived by the cube root method correlated well (r = 0.94). The mean value of MCFSR (0.85 +- 0.35) was greater than the cube root value (0.75 +- 0.35) (P < 0.001). The regression equation was y = 0.86x + 0.02. Similar correlations were obtained from gated radionuclide images using a semiautomated program (r = 0.93) in 24 subjects or completely automated program (r = 0.85) in 28 patients. The regression equation between MCFSR and that derived from the cube root of counts for the semiautomated program was y = 0.82x + 0.04 and for the automated program was y = 0.84x + 0.004. Similar correlations, slopes, and intercepts were seen using circumferential fractional shortening for angiographic data when correlated with both the semiautomated and automated gated blood pool scan programs. These data indicate that MCFSR and circumferential fractional shortening may be obtained from gated blood pool images using cube root estimates of end-diastolic and end-systolic radii with a high degree of correlation with the standard contrast ventriculographic technique. (orig.)

  8. Technical considerations in transforaminal endoscopic spine surgery at the thoracolumbar junction: report of 3 cases.

    Science.gov (United States)

    Telfeian, Albert E; Jasper, Gabriele P; Oyelese, Adetokunbo A; Gokaslan, Ziya L

    2016-02-01

    OBJECTIVE In this study the authors describe the technical considerations and feasibility of transforaminal discectomy and foraminoplasty for the treatment of lumbar radiculopathy in patients who have herniated discs at the thoracolumbar junction. METHODS After institutional review board approval, charts from 3 consecutive patients with lumbar radiculopathy and T12-L1 herniated discs who underwent endoscopic procedures between 2006 and 2014 were reviewed. RESULTS Consecutive cases (n = 1316) were reviewed to determine the incidence and success of surgery performed at the T12-L1 level. Only 3 patients (0.23%) treated with endoscopic surgery for their herniated discs had T12-L1 herniated discs; the rest were lumbar or lumbosacral herniations. For patients with T12-L1 disc herniations, the average preoperative visual analog scale score was 8.3 (indicated in the questionnaire as describing severe and constant pain). The average 1-year postoperative visual analog scale score was 1.7 (indicated in the questionnaire as mild and intermittent pain). CONCLUSIONS Transforaminal endoscopic discectomy and foraminotomy can be used as a safe yet minimally invasive technique for the treatment of lumbar radiculopathy in the setting of a thoracolumbar disc herniation. PMID:26828890

  9. Spinal Epidural Hematoma after Thoracolumbar Posterior Fusion Surgery without Decompression for Thoracic Vertebral Fracture

    Science.gov (United States)

    Minato, Tsuyoki; Miyagi, Masayuki; Saito, Wataru; Shoji, Shintaro; Nakazawa, Toshiyuki; Inoue, Gen; Imura, Takayuki; Minehara, Hiroaki; Matsuura, Terumasa; Kawamura, Tadashi; Namba, Takanori; Takahira, Naonobu; Takaso, Masashi

    2016-01-01

    We present a rare case of spinal epidural hematoma (SEH) after thoracolumbar posterior fusion without decompression surgery for a thoracic vertebral fracture. A 42-year-old man was hospitalized for a thoracic vertebral fracture caused by being sandwiched against his back on broken concrete block. Computed tomography revealed a T12 dislocation fracture of AO type B2, multiple bilateral rib fractures, and a right hemopneumothorax. Four days after the injury, in order to promote early orthostasis and to improve respiratory status, we performed thoracolumbar posterior fusion surgery without decompression; the patient had back pain but no neurological deficits. Three hours after surgery, he complained of acute pain and severe weakness of his bilateral lower extremities; with allodynia below the level of his umbilicus, postoperative SEH was diagnosed. We performed immediate revision surgery. After removal of the hematoma, his symptoms improved gradually, and he was discharged ambulatory one month after revision surgery. Through experience of this case, we should strongly consider the possibility of preexisting SEH before surgery, even in patients with no neurological deficits. We should also consider perioperative coagulopathy in patients with multiple trauma, as in this case. PMID:26989542

  10. Comparison of three different surgical approaches for treatment of thoracolumbar burst fracture

    Institute of Scientific and Technical Information of China (English)

    WU Han; WANG Chun-xin; GU Chang-yue; ZHANG Zi-yan; TONG Shen; YAN Hua-dong; WANG Jin-cheng

    2013-01-01

    Objective:The main treatment method used for thoracolumbar fractures is open reduction and internal fixation.Commonly there are three surgical approaches:anterior,posterior and paraspinal.We attempt to compare the three approaches based on our clinical data analysis.Methods:A group of 94 patients with Denis type A or B thoracolumbar burst fracture between March 2008 and September 2010 were recruited in this study.These patients were treated by anterior-,posterior-or paraspinal-approach reduction with or without decompression.The fracture was fixed with titanium mesh and Z-plate via anterior approach (24 patients),screw and rod system via posterior approach (38 patients) or paraspinal approach (32 patients).Clinical evaluations included operation duration,blood loss,incision length,preoperative and postoperative Oswestry disability index (ODI).Results:The average operation duration (94.1 min±13.7min),blood loss (86.7 ml±20.0 ml),length of incision (9.3mm± 0.7 mm) and postoperative ODI (6±0.5) were significandy lower (P<0.05) in paraspinal approach group than in traditional posterior approach group (operation duration 94.1 min±13.7 min,blood loss 143.3 ml±28.3 ml,length of incision 15.4 cm±2.1 cm and ODI 12±0.7) and anterior approach group (operation duration 176.3 min±20.7 min,blood loss 255.1 m1±38.4 ml,length of incision 18.6 cm±2.4 cm and OD113±2.4).There was not statistical difference in terms of Cobb angle on radiographs among the three approaches.Conclusion:The anterior approach surgery is convenient for resection of the vertebrae and reconstruction of vertebral height,but it is more complicated and traumatic.Hence it is mostly used for severe Denis type B fracture.The posterior approach is commonly applied to most thoracolumbar fractures and has fewer complications compared with the anterior approach,but it has some shortcomings as well.The paraspinal approach has great advantages compared with the other two approaches.It is in accordance with

  11. Hybrid cadaveric/surrogate model of thoracolumbar spine injury due to simulated fall from height.

    Science.gov (United States)

    Ivancic, Paul C

    2013-10-01

    A fall from high height can cause thoracolumbar spine fracture with retropulsion of endplate fragments into the canal leading to neurological deficit. Our objectives were to develop a hybrid cadaveric/surrogate model for producing thoracolumbar spine injury during simulated fall from height, evaluate the feasibility and performance of the model, and compare injuries with those observed clinically. Our model consisted of a 3-vertebra human lumbar specimen (L3-L4-L5) stabilized with muscle force replication and mounted within an impact dummy. The model was subjected to a fall from height of 2.2 m with impact velocity of 6.6 m/s. Kinetic and kinematic time-history responses were determined using spinal and pelvis load cell data and analyses of high-speed video. Injuries to the L4 vertebra were evaluated by fluoroscopy, radiography, and detailed anatomical dissection. Peak compression forces during the fall from height occurred at 7 ms and reached 44.7 kN at the ground, 9.1 kN at the pelvis, and 4.5 kN at the spine. Pelvis acceleration peaks reached 209.9 g at 8 ms for vertical and 62.8 g at 12 ms for rearward. Tensile load peaks were then observed (spine: 657.0 N at 47 ms; pelvis: 569.4 N at 61 ms). T1/pelvis peak flexion of 68.3° occurred at 38 ms as the upper torso translated forward while the pelvis translated rearward. Complete axial burst fracture of the L4 vertebra was observed including endplate comminution, retropulsion of bony fragments into the canal, loss of vertebral body height, and increased interpedicular distance due to fractures anterior to the pedicles and a vertical split fracture of the left lamina. Our dynamic injury model closely replicated the biomechanics of real-life fall from height and produced realistic, clinically relevant burst fracture of the lumbar spine. Our model may be used for further study of thoracolumbar spine injury mechanisms and injury prevention strategies. PMID:23792617

  12. Comparison of three different surgical approaches for treatment of thoracolumbar burst fracture

    Directory of Open Access Journals (Sweden)

    WU Han

    2013-02-01

    Full Text Available 【Abstract】Objective: The main treatment method used for thoracolumbar fractures is open reduction and in-ternal fixation. Commonly there are three surgical approaches: anterior, posterior and paraspinal. We attempt to compare the three approaches based on our clinical data analysis. Methods: A group of 94 patients with Denis type A or B thoracolumbar burst fracture between March 2008 and September 2010 were recruited in this study. These patients were treated by anterior-, posterior- or paraspinal-approach reduction with or without decompression. The fracture was fixed with titanium mesh and Z-plate via anterior approach (24 patients, screw and rod system via posterior approach (38 patients or paraspinal approach (32 patients. Clinical evaluations included operation duration, blood loss, inci-sion length, preoperative and postoperative Oswestry dis-ability index (ODI. Results: The average operation duration (94.1 min±13.7 min, blood loss (86.7 ml±20.0 ml, length of incision (9.3 mm± 0.7 mm and postoperative ODI (6±0.5 were signifi-cantly lower (P<0.05 in paraspinal approach group than in traditional posterior approach group (operation duration 94.1 min±13.7 min, blood loss 143.3 ml±28.3 ml, length of incision 15.4 cm±2.1 cm and ODI 12±0.7 and anterior approach group (operation duration 176.3 min±20.7 min, blood loss 255.1 ml±38.4 ml, length of incision 18.6 cm±2.4 cm and ODI 13±2.4. There was not statistical difference in terms of Cobb angle on radiographs among the three approaches. Conclusion: The anterior approach surgery is conve-nient for resection of the vertebrae and reconstruction of vertebral height, but it is more complicated and traumatic. Hence it is mostly used for severe Denis type B fracture. The posterior approach is commonly applied to most thora-columbar fractures and has fewer complications compared with the anterior approach, but it has some shortcomings as well. The paraspinal approach has great advantages

  13. Biomechanical evaluation of vertebroplasty using calcium sulfate cement for thoracolumbar burst fractures

    Institute of Scientific and Technical Information of China (English)

    WU Xiao-tao; JIANG Xing-jie; ZHANG Shao-dong; YANG Hui-lin

    2007-01-01

    Objective: To evaluate the biomechanical performance of vertebroplasty using calcium sulfate cement for thoracolumbar burst fractures.Methods: Sixteen bovine thoracolumbar spines (T11-L1 ) were divided into 4 groups (A, B, C and D). After burst-fracture model was created, 12 vertebral bodies in Groups A, B and C were augmented with calcium sulfate cement (CSC), calcium phosphate cement (CPC) and polymethylmethacrylate ( PMMA ) bone cement,respectively. Each anterior vertebral body height was measured with a caliper at 4 time points: intact conditions(HInt), post-fracture (HFr), post-reduction (HRe) and post-vertebroplasty (HVP). The filling volume of 3 different bone cements was also measured. Each vertebral body was compressed at 0.5 mm/s using a hinged plating system on a materials testing machine to 50% of the postvertebroplasty height to determine strength and stiffness.Difference was checked using t test or One-way ANOVA.Results: The average strike energy was 66. 2 J.Vertebroplasty with different cements could sustain vertebral height. The average filling volume of bone cement in 3 groups was 4.35 ml (CSC), 3.72 ml (CPC) and 3.95 ml (PMMA), respectively, and there was no statistically significant difference among them ( P >0.05).Vertebroplasty with PMMA completely restored strength(116%) and stiffness (105%). CSC or CPC partly recovered vertebral strength and stiffness. However,greater strength restoration was got with CSC ( 1 659 N) as compared with CPC (1 011N, P<0.01 ). Regarding stiffness, differences between CSC (140 N/mm ±40 N/mm)and the other two bone cements ( CPC :148 N/mm ±33 N/mm,PMMA:236 N/mm ±97 N/mm) were not significant (P>0.05).Conclusions: For a burst-fracture of calf spine, useof CSC for vertebroplasty yields similar vertebral stiffnessas compared with PMMA or CPC. Although augmentationwith CSC partly obtains the normal strength, thistreatment still can be applied in thoracolumbar burstfractures with other instrumental devices in

  14. Analysis of dispersion characteristics of circumferential guided waves and detection of axial cracks in pipe

    International Nuclear Information System (INIS)

    A circumferential guided wave method was developed to detect the axial crack on the but feeder pipe. Dispersion curves of circumferential guided waves were calculated as a function of curvature of the pipe. In the case of thin plate, i. e. infinite curvature, as the frequency increases, the S0 and A0 become to be coincided and eventually Rayleigh wave mode. In the case of pipe, however, as the curvature increases, the lowest modes do not coincide even in the high frequencies. Based on the analysis, a rocking technique using angle beam transducer was applied to detect axial defect in the bent region of PHWR feeder pipe. After review of the experimental data on the artificial notches, the vibration modes of each signal were identified. It was found that the notches with the depth of 10% of wall thickness be detected with the method.

  15. Circumferential-wave phase velocities for empty, fluid-immersed spherical metal shells

    DEFF Research Database (Denmark)

    Überall, Herbert; Ahyi, A. C.; Raju, P. K.;

    2002-01-01

    In earlier studies of acoustic scattering resonances and of the dispersive phase velocities of surface waves that generate them [see, e.g., Talmant et al., J. Acoust. Soc. Am. 86, 278–289 (1989) for spherical aluminum shells] we have demonstrated the effectiveness and accuracy of obtaining phase...... results with those calculated from three-dimensional elasticity theory whenever the latter are available. The present investigation is based on the mentioned resonance frequency/elasticity theory connection, and we obtain comparative circumferential-wave dispersion-curve results for water......-loaded, evacuated spherical metal shells of aluminum, stainless steel, and tungsten carbide. In particular, the characteristic upturn of the dispersion curves of low-order shell-borne circumferential waves (A or A0 waves) which takes place on spherical shells when the frequency tends towards very low values, is...

  16. In vivo vascular wall shear rate and circumferential strain of renal disease patients.

    Science.gov (United States)

    Park, Dae Woo; Kruger, Grant H; Rubin, Jonathan M; Hamilton, James; Gottschalk, Paul; Dodde, Robert E; Shih, Albert J; Weitzel, William F

    2013-02-01

    This study measures the vascular wall shear rate at the vessel edge using decorrelation based ultrasound speckle tracking. Results for nine healthy and eight renal disease subjects are presented. Additionally, the vascular wall shear rate and circumferential strain during physiologic pressure, pressure equalization and hyperemia are compared for five healthy and three renal disease subjects. The mean and maximum wall shear rates were measured during the cardiac cycle at the top and bottom wall edges. The healthy subjects had significantly higher mean and maximum vascular wall shear rate than the renal disease subjects. The key findings of this research were that the mean vascular wall shear rates and circumferential strain changes between physiologic pressure and hyperemia that was significantly different between healthy and renal disease subjects.

  17. Guided waves based diagnostic imaging of circumferential cracks in small-diameter pipe.

    Science.gov (United States)

    Liu, Kehai; Wu, Zhanjun; Jiang, Youqiang; Wang, Yishou; Zhou, Kai; Chen, Yingpu

    2016-02-01

    To improve the safety and reliability of pipeline structures, much work has been done using ultrasonic guided waves methods for pipe inspection. Though good for evaluating the defects in the pipes, most of the methods lack the capability to precisely identify the defects in the pipe features like welds or supports. Therefore, a novel guided wave based cross-sectional diagnostic imaging algorithm was developed to improve the ability of circumferential cracks identification in the pipe features. To ensure the accuracy of the imaging, an angular profile-based frequency selection method is presented. As validation, the approach was employed to identify the presence and location of a small circumferential crack with 1.13% cross sectional area (CSA) in the welding zone of a 48 mm diameter type 304 stainless steel pipe. Accurate identification results have demonstrated the effectiveness of the developed approach. PMID:26548527

  18. Low cycle fatigue of pressurized pipes with circumferential flaws under cyclic bending moment

    International Nuclear Information System (INIS)

    Pipes of 706 mm inner diameter, 47 mm wall thickness and about 5,000 mm in length were provided with circumferential surface cracks and loaded by internal pressure of 15 MPa whilst being simultaneously subjected to an alternating external bending moment. Usually a load ratio R of -1 (Mmin/Mmax), in one case R = 0.1, was applied. The pipes were fabricated of two types of ferritic steel: one, grade 20 MnMoNi 5 5, with a high upper shelf impact energy of about 200 J and one, MnMoNiV-special melt, with a low upper shelf impact energy of about 60 J. Deformation and crack growth in the wall thickness and circumferential direction were determined and compared with calculated values. 9 refs., 13 figs

  19. Circumferential mucosal dissection and esophageal perforation in a patient with eosinophilic esophagitis

    Institute of Scientific and Technical Information of China (English)

    Gennaro Liguori; Maurizio Cortale; Fabrizio Cimino; Michele Sozzi

    2008-01-01

    A young man with a previous history of episodes of mild solid food dysphagia was admitted with a total dysphagia.The esophagogastroduodenoscopy (EGDS) showed an extensive disruption of mucosal layer with a cul-de-sac in the lower part of the esophagus.Soon after the procedure,the patient suffered from an acute chest pain and subsequent CT scan demonstrated an intramural circumferential dissection of thoracic esophagus,and a mediastinal emphysema.An emergency right thoracotomy was performed,followed by a total esophagectomy with esophagogastroplasty and jejunostomy.The histopathology confirmed that mucosal and submucosal layers were circumferentially detached from muscular wall and showed an eosinophilic infiltration of the whole organ with necrosis and erosions of mucosal,submucosal and muscular layers.The diagnosis was esophageal perforation in eosinophilic esophagitis.

  20. Feasibility of radial and circumferential strain analysis using 2D speckle tracking echocardiography in cats

    OpenAIRE

    Takano, Hiroshi; ISOGAI, Tomomi; Aoki, Takuma; WAKAO, Yoshito; Fujii, Yoko

    2014-01-01

    The purpose of the present study is to investigate the feasibility of strain analysis using speckle tracking echocardiography (STE) in cats and to evaluate STE variables in cats with hypertrophic cardiomyopathy (HCM). Sixteen clinically healthy cats and 17 cats with HCM were used. Radial and circumferential strain and strain rate variables in healthy cats were measured using STE to assess the feasibility. Comparisons of global strain and strain variables between healthy cats and cats with HCM...

  1. Numerical Investigation of Inlet Distortion on an Axial Flow Compressor Rotor with Circumferential Groove Casing Treatment

    Institute of Scientific and Technical Information of China (English)

    Huang Jian; Wu Hu

    2008-01-01

    On the base of an assumed steady inlet circumferential total pressure distortion, three-dimensional time-dependent numerical simulations are conducted on an axial flow subsonic compressor rotor. The performances and flow fields of a compressor rotor, either casing treated or untreated, are investigated in detail either with or without inlet pressure distortion. Results show that the circumferential groove casing treatment can expand the operating range of the compressor rotor either with or without inlet pressure distortion at the expense of a drop in peak isentropic efficiency. The casing treatment is capable of weakening or even removing the tip leakage vortex effectively either with or without inlet distortion. In clean inlet circumstances, the enhancement and forward movement of tip leakage vortex cause the untreated compressor rotor to stall. By contrast, with circumferential groove casing, the serious flow separation on the suction surface leads to aerodynamic stalling eventually. In the presence of inlet pressure distortion, the blade loading changes from passage to passage as the distorted inflow sector is traversed. Similar to the clean inlet circumstances, with a smooth wall casing, the enhancement and forward movement of tip leakage vortex are still the main factors which lead to the compressor rotor stalling eventu-ally. When the rotor works under near stall conditions, the blockage resulting from the tip leakage vortex in all the passages is very seri-ous. Especially in several passages, flow-spillage is observed. Compared to the clean inlet circumstances, circumferential groove casing treatment can also eliminate the low energy zone in the outer end wall region effectively.

  2. Selective radiofrequency therapy as a non-invasive approach for contactless body contouring and circumferential reduction.

    Science.gov (United States)

    Fajkošová, Kateřina; Machovcová, Alena; Onder, Meltem; Fritz, Klaus

    2014-03-01

    In this study, the efficacy of non-contact, selective radiofrequency (RF) were evaluated for body contouring as non-invasive fat and circumferential reduction of the abdomen. 40 healthy (36 female, 4 male) subjects showing significant volume of subcutaneous fat tissue on the abdomen and waistline were included. Once a week for 30 minutes, 4 sessions were performed. The applicator was placed on a supplied spacer covering the treatment area. Maximum power was 200W, which induced heat in the fat and connective tissue layer. The homogeneity of heat distribution and temperature of the skin surface were controlled. The circumferential reduction was measured at the baseline and after the last treatment. The photographs and adverse effects were recorded. Participants completed the self-evaluation questionnaires and rated their level of satisfaction. All subjects tolerated the treatments well. The only side effect was mild to moderate erythema. 35 subjects finished the protocol as planned and 5 subjects dropped off due to events not related to the study. 32 subjects had a 1-13 cm decrease in abdominal circumference and 3 subjects did not show significant response (0-1 cm). Most likely, a very thin fat layer was the reason for lack of response (the non-responding group was the thinnest patient group). No significant differences were found between men and women. The average decrease of 4.93 cm was calculated as a result of circumferential reduction statistical evidence. This study demonstrates that the selective RF system designed for contactless deep tissue heating is a painless, safe, and effective treatment for non-surgical body contouring and circumferential fat reduction.

  3. Nonlinear vibrations and energy exchange of single-walled carbon nanotubes. Circumferential flexural modes

    Science.gov (United States)

    Strozzi, Matteo; Smirnov, Valeri V.; Manevitch, Leonid I.; Milani, Massimo; Pellicano, Francesco

    2016-10-01

    In this paper, the nonlinear vibrations and energy exchange of single-walled carbon nanotubes (SWNTs) are studied. The Sanders-Koiter theory is applied to model the nonlinear dynamics of the system in the case of finite amplitude of vibration. The SWNT deformation is described in terms of longitudinal, circumferential and radial displacement fields. Simply supported, clamped and free boundary conditions are considered. The circumferential flexural modes (CFMs) are investigated. Two different approaches based on numerical and analytical models are compared. In the numerical model, an energy method based on the Lagrange equations is used to reduce the nonlinear partial differential equations of motion to a set of nonlinear ordinary differential equations, which is solved by using the implicit Runge-Kutta numerical method. In the analytical model, a reduced form of the Sanders-Koiter theory assuming small circumferential and tangential shear deformations is used to get the nonlinear ordinary differential equations of motion, which are solved by using the multiple scales analytical method. The transition from energy beating to energy localization in the nonlinear field is studied. The effect of the aspect ratio on the analytical and numerical values of the nonlinear energy localization threshold for different boundary conditions is investigated. Time evolution of the total energy distribution along the axis of a simply supported SWNT

  4. Circumferential profiles for region-based analysis of dynamic SPECT data

    International Nuclear Information System (INIS)

    Kinetic parameters (washin, washout) of dynamic SPECT teboroxime data sets may provide a more sensitive measure of coronary artery disease than conventional (Tl, MIBI) static myocardial perfusion studies. A time-consuming and subjective step of the data analysis is drawing regions of interest to delineate blood pool and myocardial tissue regions. The time-activity curves for the regions are then used to estimate local kinetic parameters. In this work, the appropriate time-activity curves are found automatically, in a manner similar to that used for calculating circumferential profiles in conventional static cardiac studies. The drawbacks to applying standard static circumferential profile methods are the high noise level and high liver uptake common in dynamic studies. Searching along each ray for maxima to locate the myocardium does not always provide useful information. Here we propose an iterative scheme in which constraints are imposed on the radii searched. The constraints are based on the shape of the time-activity curve of the circumferential profile members and on an assumption that the short axis slices are approximately circular. The constraints eliminate outliers and help to reduce the effects of the noise and the liver activity. Kinetic parameter estimates from the automatically generated regions were comparable to estimates from manually selected regions in canine dynamic teboroxime studies

  5. Soft Sensor for Oxide Scales on the Steam Side of Superheater Tubes under Uneven Circumferential Load

    Directory of Open Access Journals (Sweden)

    Qing Wei Li

    2015-01-01

    Full Text Available A soft sensor for oxide scales on the steam side of superheater tubes of utility boiler under uneven circumferential loading is proposed for the first time. First finite volume method is employed to simulate oxide scales growth temperature on the steam side of superheater tube. Then appropriate time and spatial intervals are selected to calculate oxide scales thickness along the circumferential direction. On the basis of the oxide scale thickness, the stress of oxide scales is calculated by the finite element method. At last, the oxide scale thickness and stress sensors are established on support vector machine (SMV optimized by particle swarm optimization (PSO with time and circumferential angles as inputs and oxide scale thickness and stress as outputs. Temperature and stress calculation methods are validated by the operation data and experimental data, respectively. The soft sensor is applied to the superheater tubes of some power plant. Results show that the soft sensor can give enough accurate results for oxide scale thickness and stress in reasonable time. The forecasting model provides a convenient way for the research of the oxide scale failure.

  6. Correlation of outcome measures with epidemiological factors in thoracolumbar spinal trauma

    Directory of Open Access Journals (Sweden)

    Upendra Bidre

    2007-01-01

    Full Text Available Background : The epidemiological data of a given population on spinal trauma in India is lacking. The present study was undertaken to evaluate the profile of patients with thoracolumbar fractures in a tertiary care hospital in an urban setup. Materials and Methods : Four hundred forty patients with thoracolumbar spinal injuries admitted from January 1990 to May 2000 to the All India Institute of Medical Sciences were included in the analysis. Both retrospective data retrieval and prospective data evaluation of patients were done from January 1998 to May 2000. Epidemiological factors like age, sex and type of injury, mode of transport, time of reporting and number of transfers before admission were recorded. Frankel′s grading was used to assess neurological status. Functional assessment of all patients was done using the FIM™ instrument (Functional Independence Measure. Average follow-up was 33 months (24-41 months. Results : Of the 440 patients, females comprised 17.95% (n=79, while 82.04% (n=361 were males. As many as 40.9% (n=180 of them were in the third decade. Fall from height remained the most common cause 52.3% (n=230. Two hundred sixty (59.1% patients reported within 48 hours. Thirty-two (7.27% patients had single transfer, and all 32 showed complete independence for mobility at final follow-up. 100 of 260 (38.5% patients reporting within 48 hours developed pressure sores, while 114 of 142 (80.28% patients reporting after 5 days developed pressure sores. Conclusion : The present study highlights the magnitude of the problems of our trauma-care and transport system and the difference an effective system can make in the care of spinal injury patients. There is an urgent need for epidemiological data on a larger scale to emphasize the need for a better trauma-care system and pave way for adaptation of well-established trauma-care systems from developed countries.

  7. Biomechanics of Thoracolumbar Burst and Chance-Type Fractures during Fall from Height

    Science.gov (United States)

    Ivancic, Paul C.

    2014-01-01

    Study Design In vitro biomechanical study. Objective To investigate the biomechanics of thoracolumbar burst and Chance-type fractures during fall from height. Methods Our model consisted of a three-vertebra human thoracolumbar specimen (n = 4) stabilized with muscle force replication and mounted within an impact dummy. Each specimen was subjected to a single fall from an average height of 2.1 m with average velocity at impact of 6.4 m/s. Biomechanical responses were determined using impact load data combined with high-speed movie analyses. Injuries to the middle vertebra of each spinal segment were evaluated using imaging and dissection. Results Average peak compressive forces occurred within 10 milliseconds of impact and reached 40.3 kN at the ground, 7.1 kN at the lower vertebra, and 3.6 kN at the upper vertebra. Subsequently, average peak flexion (55.0 degrees) and tensile forces (0.7 kN upper vertebra, 0.3 kN lower vertebra) occurred between 43.0 and 60.0 milliseconds. The middle vertebra of all specimens sustained pedicle and endplate fractures with comminution, bursting, and reduced height of its vertebral body. Chance-type fractures were observed consisting of a horizontal split fracture through the laminae and pedicles extending anteriorly through the vertebral body. Conclusions We hypothesize that the compression fractures of the pedicles and vertebral body together with burst fracture occurred at the time of peak spinal compression, 10 milliseconds. Subsequently, the onset of Chance-type fracture occurred at 20 milliseconds through the already fractured and weakened pedicles and vertebral body due to flexion-distraction and a forward shifting spinal axis of rotation. PMID:25083357

  8. Lumbosacral pain caused by blockage of dynamic vertebrogenic segments of thoracolumbar transition

    Directory of Open Access Journals (Sweden)

    Sead Čebić

    2011-04-01

    Full Text Available Introduction: In the case of the Thoraco-lumbar Junction Syndrome the pain is located in the region of the lumbo-sacral junction. Sudden torsion movements and lifting of objects while the spine is in position of torsion is the cause in most cases. In those cases, a blockade on the  Th11-Th12-L1 vertebrae occurs. The aim of this research was to determine the number of patients with the Low Back Pain whose origin is in the thoracic vertebral dynamic segments, in relation to the total number of patients according to gender, age and profession.Methods: In this retrospective, descrtiptive study we have analyzed patients treated for Lumbosacral syndrome of thoracic origin in private specialist ambulant “Cebic” in Zavidovici during one year period. We analyzed data from patients medical records and history.Results: Total of 1882 patients were treated for the Low Back Pain, of which 67 (3.56% had an origin of the pain in the Thoraco-lumbar Junction. In the analyzed group, there were 49 (73.1% man and 18 (26.8% women. The largest number of males, 21 (42.8%, were between 40-49 years old, while the largest number of woman, 9 (50%, was 20 to 29 years old. Largest number of male patients, 35 (71.8%, were physical workers, while most of the female subjects, 7 (38.8%, were of ce workers.Conclusions: Our research concludes that the number of patients with Low Back Pain of the thoracic origin (3.56% is not disregarded, but these facts are usually overlooked. Therapy for those kinds of patients is in most cases concentrated to the lower segments of the lumbar spine, which gives unsatisfactory therapeutic results.

  9. Multidimensional Analysis of Magnetic Resonance Imaging Predicts Early Impairment in Thoracic and Thoracolumbar Spinal Cord Injury.

    Science.gov (United States)

    Mabray, Marc C; Talbott, Jason F; Whetstone, William D; Dhall, Sanjay S; Phillips, David B; Pan, Jonathan Z; Manley, Geoffrey T; Bresnahan, Jacqueline C; Beattie, Michael S; Haefeli, Jenny; Ferguson, Adam R

    2016-05-15

    Literature examining magnetic resonance imaging (MRI) in acute spinal cord injury (SCI) has focused on cervical SCI. Reproducible systems have been developed for MRI-based grading; however, it is unclear how they apply to thoracic SCI. Our hypothesis is that MRI measures will group as coherent multivariate principal component (PC) ensembles, and that distinct PCs and individual variables will show discriminant validity for predicting early impairment in thoracic SCI. We undertook a retrospective cohort study of 25 patients with acute thoracic SCI who underwent MRI on admission and had American Spinal Injury Association Impairment Scale (AIS) assessment at hospital discharge. Imaging variables of axial grade, sagittal grade, length of injury, thoracolumbar injury classification system (TLICS), maximum canal compromise (MCC), and maximum spinal cord compression (MSCC) were collected. We performed an analytical workflow to detect multivariate PC patterns followed by explicit hypothesis testing to predict AIS at discharge. All imaging variables loaded positively on PC1 (64.3% of variance), which was highly related to AIS at discharge. MCC, MSCC, and TLICS also loaded positively on PC2 (22.7% of variance), while variables concerning cord signal abnormality loaded negatively on PC2. PC2 was highly related to the patient undergoing surgical decompression. Variables of signal abnormality were all negatively correlated with AIS at discharge with the highest level of correlation for axial grade as assessed with the Brain and Spinal Injury Center (BASIC) score. A multiple variable model identified BASIC as the only statistically significant predictor of AIS at discharge, signifying that BASIC best captured the variance in AIS within our study population. Our study provides evidence of convergent validity, construct validity, and clinical predictive validity for the sampled MRI measures of SCI when applied in acute thoracic and thoracolumbar SCI.

  10. Numerical Simulation for Three-Dimensional (3D) Unsteady State Temperature Field in Circumferential Laser Oxygen Cutting of Pipes

    Institute of Scientific and Technical Information of China (English)

    Kaijin HUANG; Dawen ZENG; Changsheng XIE; Desheng XU

    2003-01-01

    A 3D unsteady state numerical model of heat transfer in the circumferential laser oxygen cutting of pipes wasdeveloped. In order to minimize the computing time required for solving the finite difference equations as much aspossible, the alternating direct

  11. Scalp ulceration from a circumferential head dressing after craniotomy: Case report of an uncommon complication due to human error

    OpenAIRE

    Singhal, Ashutosh; Bray, Peter W.; Bernstein, Mark

    2004-01-01

    The present paper describes a previously unpublished complication of the application of a circumferential head dressing after cranial neuro-surgery. A 34-year-old woman developed a large area of skin necrosis on her forehead from a circumferential head dressing applied after the surgical removal of a colloid cyst. Neurological recovery was excellent but plastic surgical repair of her iatrogenic cosmetic injury was required.

  12. "Free-hand" technique for thoracolumbar pedicle screw instrumentation: Critical appraisal of current "State-of-Art"

    Directory of Open Access Journals (Sweden)

    Mattei Tobias

    2009-01-01

    Full Text Available Pedicle screws are widely used for instrumentation of the thoracolumbar spine. The anatomic studies performed in the last two decades, detailing the complex morphometry and three-dimensional anatomy of the thoracolumbar pedicles, have enabled the emergence of the so-called "free-hand" technique of pedicle screw placement based exclusively on anatomical parameters. However, in the thoracic spine, the benefits of pedicle screws have been tempered by its potential risks, such as, spinal canal violation, pedicle fracture, nerve root compression, and vascular lesions. Furthermore, the narrow and inconsistent shape of the thoracic pedicles, especially in spinal deformity, makes their placement technically challenging. In this article, the authors make a critical appraisal of current "state-of-art" of "free-hand" technique of pedicle instrumentation, analyzing its anatomical basis, surgical technique, present indications and limitations as well as the role of adjuvant image-guided and neurophysiological monitoring methods.

  13. Clinical observation of umbilical cord mesenchymal stem cell transplantation in treatment for sequelae of thoracolumbar spinal cord injury

    OpenAIRE

    Cheng, Hongbin; Liu, Xuebin; Hua, Rongrong; Dai, Guanghui; Wang, Xiaodong; Gao, Jianhua; An, Yihua

    2014-01-01

    Background Umbilical cord mesenchymal stem cells (UCMSCs) have a considerable advantage and potential in treating for central nervous system diseases and have become a novel alternative treatment for spinal cord injury. This study aims to compare the neurological function outcome of stem cell transplantation, rehabilitation therapy, and self-healing for sequelae of spinal cord injury. Methods Thirty-four cases of thoracolumbar spinal cord injury were randomly divided into three groups: the st...

  14. Ultrasound Evaluation of the Combined Effects of Thoracolumbar Fascia Injury and Movement Restriction in a Porcine Model

    OpenAIRE

    Bishop, James H.; James R Fox; Maple, Rhonda; Loretan, Caitlin; Badger, Gary J.; Henry, Sharon M.; Vizzard, Margaret A.; Langevin, Helene M.

    2016-01-01

    The persistence of back pain following acute back “sprains” is a serious public health problem with poorly understood pathophysiology. The recent finding that human subjects with chronic low back pain (LBP) have increased thickness and decreased mobility of the thoracolumbar fascia measured with ultrasound suggest that the fasciae of the back may be involved in LBP pathophysiology. This study used a porcine model to test the hypothesis that similar ultrasound findings can be produced experime...

  15. The Effects of Glucocorticoid and Voluntary Exercise Treatment on the Development of Thoracolumbar Kyphosis in Dystrophin-Deficient Mice

    OpenAIRE

    Brereton, Daniel; Plochocki, Jeffrey; An, Daniel; Costas, Jeffrey; Simons, Erin

    2012-01-01

    The development of spinal curvature deformities is a hallmark of muscular dystrophy. While glucocorticoid treatment has been shown to prolong muscle function in dystrophic mice, its effects on the development of dystrophinopathic spinal deformation are poorly understood. In this study, we test the effects of glucocorticoid treatment on the onset of thoracolumbar kyphosis in the dystrophin-deficient mdx mouse using voluntary running exercise to exacerbate muscle fibrosis. We measure the kyphot...

  16. The role of the mini-open thoracoscopic-assisted approach in the management of metastatic spine disease at the thoracolumbar junction.

    Science.gov (United States)

    Ravindra, Vijay M; Brock, Andrea; Awad, Al-Wala; Kalra, Ricky; Schmidt, Meic H

    2016-08-01

    OBJECTIVE Treatment advances have resulted in improved survival for many cancer types, and this, in turn, has led to an increased incidence of metastatic disease, specifically to the vertebral column. Surgical decompression and stabilization prior to radiation therapy have been shown to improve functional outcomes, but anterior access to the thoracolumbar junction may involve open thoracotomy, which can cause significant morbidity. The authors describe the treatment of 12 patients in whom a mini-open thoracoscopic-assisted approach (mini-open TAA) to the thoracolumbar junction was used to treat metastatic disease, with an analysis of outcomes. METHODS The authors reviewed a retrospective cohort of patients treated for thoracolumbar junction metastatic disease with mini-open TAA between 2004 and 2016. Data collection included operative time, estimated blood loss, length of stay, follow-up duration, and pre- and postoperative visual analog scale scores and Frankel grades. RESULTS Twelve patients underwent a mini-open TAA procedure for metastatic disease at the thoracolumbar junction. The mean age of patients was 59 years (range 53-77 years), mean estimated blood loss was 613 ml, and the mean duration of the mini-open TAA procedure was 234 minutes (3.8 hours). The median length of stay in the hospital was 7.5 days (range 5-21 days). All 12 patients had significant improvement in their postoperative pain scores in comparison with their preoperative pain scores (p open TAA to the thoracolumbar junction for metastatic disease is a durable procedure that has a reduced morbidity rate compared with traditional open thoracotomy for ventral decompression and fusion. It compares well with traditional and novel posterior approaches to the thoracolumbar junction. The authors found a significant improvement in preoperative pain and neurological symptoms that supports greater use of the mini-open TAA for the treatment of complex metastatic disease at the thoracolumbar junction.

  17. Sensory findings after stimulation of the thoracolumbar fascia with hypertonic saline suggest its contribution to low back pain.

    Science.gov (United States)

    Schilder, Andreas; Hoheisel, Ulrich; Magerl, Walter; Benrath, Justus; Klein, Thomas; Treede, Rolf-Detlef

    2014-02-01

    Injection of hypertonic saline into deep tissues of the back (subcutis, muscle, or the surrounding fascia) can induce acute low back pain (LBP). So far, no study has analyzed differences in temporal, qualitative, and spatial pain characteristics originating from these tissues. The current study aimed to investigate the role of the thoracolumbar fascia as a potential source of LBP. In separate sessions, 12 healthy subjects received ultrasound-guided bolus injections of isotonic saline (0.9%) or hypertonic saline (5.8%) into the erector spinae muscle, the thoracolumbar fascia (posterior layer), and the overlying subcutis. Subjects were asked to rate pain intensity, duration, quality, and spatial extent. Pressure pain thresholds were determined pre and post injection. Injections of hypertonic saline into the fascia resulted in significantly larger area under the curve of pain intensity over time than injections into subcutis (Pfascia or subcutis. Pain radiation and pain affect evoked by fascia injection exceeded those of the muscle (Pfascia injection (burning, throbbing, and stinging) suggested innervation by both A- and C-fiber nociceptors. These findings show that the thoracolumbar fascia is the deep tissue of the back that is most sensitive to chemical stimulation, making it a prime candidate to contribute to nonspecific LBP but not to localized pressure hyperalgesia.

  18. Short or long fusion after thoracolumbar burst fractures does not alter selected gait parameters: a preliminary study.

    Science.gov (United States)

    Oken, Fuad; Yildirim, Ozgur; Oken, Oznur; Gulcek, Murat; Yavuzer, Gunes; Ucaner, Ahmet

    2011-06-01

    We evaluated the gait characteristics of patients who had short or long-segment fusion after thoracolumbar burst fractures. The study included 12 patients (5 male, 7 female) who had vertebral fusion after traumatic thoracolumbar region (T12-L2) burst fractures. Patients were divided into two groups based on fixation type (short or long segment). Twelve healthy age and sex-matched subjects (seven male, five female) served as controls. Quantitative gait data, including all time-distance (walking velocity, cadence, step time, step length, double support time), kinematic (joint rotation angles of pelvis, hip, knee, and ankle), and kinetic data (moments of hip in sagittal and coronal plane) were collected. Three patients had a T12, six patients an L1, and three patients had an L2 lesion. Patients in the two groups were similar in terms of age, sex, and time since operation. No significant differences were found in the time-distance, kinematic, and kinetic gait characteristics between the two groups. This preliminary study reveals that the gait characteristics of patients with short and long-segment fusion after thoracolumbar burst fractures were similar to those of healthy subjects and did not differ from each other. However, the present results should be interpreted with caution due to the small sample size. Future studies with larger groups are needed to provide additional data to validate these findings.

  19. Magnetic resonance imaging characterization of circumferential and longitudinal strain under various coronary interventions in swine

    Institute of Scientific and Technical Information of China (English)

    Mohammed; SA; Suhail; Mark; W; Wilson; Steven; W; Hetts; Maythem; Saeed

    2013-01-01

    AIM:To compare the acute changes in circumferential and longitudinal strain after exposing a coronary artery to various interventions in swine.METHODS:Percutaneous balloon angioplasty catheter was guided to location aid device(LAD)under X-ray fluoroscopy to create different patterns of ischemic insults.Pigs(n=32)were equally divided into 4 groups:controls,90 min LAD occlusion/reperfusion,LAD microembolization,and combined LAD occlusion/microembolization/reperfusion.Three days after interventions,cine,tagged and viability magnetic resonance imaging(MRI)were acquired to measure and compare left and right circumferential strain,longitudinal strain and myocardial viability,respectively.Measurements were obtained using HARP and semi-automated threshold method and statistically analyzed using unpaired t-test.Myocardial and vascular damage was characterized microscopically.RESULTS:Coronary microemboli caused greater impairment in l left ventricular(LV)circumferential strain and dyssynchrony than LAD occlusion/reperfusion despite the significant difference in the extent of myocardial damage.Microemboli also caused significant decrease in peak systolic strain rate of remote myocardium and LV dyssynchrony.Cine MRI demonstrated the interaction between LV and right ventricular(RV)at 3 d after interventions.Compensatory increase in RV free wall longitudinal strain was seen in response to all interventions.Viability MRI,histochemical staining and microscopy revealed different patterns of myocardial damage and microvascular obstruction.CONCLUSION:Cine MRI revealed subtle changes in LV strain caused by various ischemic insults.It also demonstrated the interaction between the right and left ventricles after coronary interventions.Coronary microemboli with and without acute myocardial infarction(AMI)cause complex myocardial injury and ventricular dysfunction that is not replicated in solely AMI.

  20. Posterior-Only Circumferential Decompression and Reconstruction in the Surgical Management of Lumbar Vertebral Osteomyelitis.

    Science.gov (United States)

    Skovrlj, Branko; Guzman, Javier Z; Caridi, John; Cho, Samuel K

    2016-02-01

    Study Design Case report. Objective The purpose of this report is to discuss the surgical management of lumbar vertebral osteomyelitis with a spinal epidural abscess (SEA) and present a single-stage, posterior-only circumferential decompression and reconstruction with instrumentation using an expandable titanium cage and without segmental nerve root sacrifice as an option in the treatment of this disease process. Methods We report a 42-year-old man who presented with 3 days of low back pain and chills who rapidly decompensated with severe sepsis following admission. Magnetic resonance imaging of his lumbosacral spine revealed intramuscular abscesses of the left paraspinal musculature and iliopsoas with SEA and L4 vertebral body involvement. The patient failed maximal medical treatment, which necessitated surgical treatment as a last resort for infectious source control. He underwent a previously undescribed procedure in the setting of SEA: a single-stage, posterior-only approach for circumferential decompression and reconstruction of the L4 vertebral body with posterior segmental instrumented fixation. Results After the surgery, the patient's condition gradually improved; however, he suffered a wound dehiscence necessitating a surgical exploration and deep wound debridement. Six months after the surgery, the patient underwent a revision surgery for adjacent-level pseudarthrosis. At 1-year follow-up, the patient was pain-free and off narcotic pain medication and had returned to full activity. Conclusion This patient is the first reported case of lumbar osteomyelitis with SEA treated surgically with a single-stage, posterior-only circumferential decompression and reconstruction with posterior instrumentation. Although this approach is more technically challenging, it presents another viable option for the treatment of lumbar vertebral osteomyelitis that may reduce the morbidity associated with an anterior approach. PMID:26835214

  1. 无神经症状的胸腰段不稳定性骨折术后康复治疗%Post-operation rehabilitation treatment of instable thoracolumbar fractures without nervous symptoms

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    @@Background: Conservative treatment was applied in most instable thoracolumbar fractures without nervous symptoms, while the incomplete replacement would cause post protruding deformity which would hamper the function, the posterior approach operation has excellent effect on it. Objective: To discuss the effects of the post-operation rehabilitation treatment of instable thoracolumbar fractures without nervous symptoms. Unit :The Central Hospital of Jiangmen City.

  2. Investigations on an Axial Flow Fan Stage subjected to Circumferential Inlet Flow Distortion and Swirl

    Institute of Scientific and Technical Information of China (English)

    M.Govardhan; K.Viswanath

    1997-01-01

    The combined effects of swirl and circumferential inlet flow distortion on the flow field of an axial flow fan stage are reported in this paper,The study involves measurements at the inlet of the rotor and exit of the rotor and stator atdesign and off design flow conditions.The study indicated that at the design flow condition,swirl had caused deterioration of the performance in addition to that caused by distortion.Pressure rise imparted in the distortion zone is hogher than in the free zone.The attenuation of distortion is high in the presence of swirl.

  3. Inner wall inspection of steam generator tubes with circumferential welds using ultrasonic crack detection

    International Nuclear Information System (INIS)

    Cracks in the neighbourhood of circumferential welds at the inside of generator tubes to the weld seam can be detected with an ultrasonic probe system using Rayleigh's surface waves. A reference reflector with about 0.5 mm in depth and 1.5 mm in length is used. The ultrasonic inspection system is using a rotating mirror with two faces which can detect cracks on both sides of the weld and which can clearly separate crown or root indications from real defects. The signal-to-noise ratio is better than 12 dB. The system and results on tubes with artificial and real test reflectors are described

  4. Inner wall inspection of steam generator tubes with circumferential welds using ultrasonic crack detection

    International Nuclear Information System (INIS)

    Cracks in the neighbourhood of circumferential welds at the inside of generator tubes to the weld seam can be detected with an ultrasonic probe system using Rayleigh's surface waves. A reference reflector with about 0.5 mm in depth and 1.5 mm in length is used. The ultrasonic inspection system is using a rotating mirror with two faces which can detect cracks on both sides of the weld and which can clearly separate crown or root indications from real defects. The signal-to-noise ratio is better than 12 dB. The system and results on tubes with artificial and real test reflectors are described. 8 refs

  5. Geometric characterization of a circumferential seam by automatic segmentation of digitized radioscopic images

    International Nuclear Information System (INIS)

    The present study deals with the nondestructive control of a circumferential seam by digital radioscopy. A series of images for one complete revolution of the welded component is available. We first resort to a joint approach by simulation and experimentation. This approach allows the detection of the molten zone limits for an initial image. We then develop a segmentation method that permits automatic extraction of the geometric characteristics of the set of images representative of the weld. These measures supply fast and automatic control of the weld quality. Results are shown for real components. (author)

  6. Effects of inlet circumferential fluctuation on the sweep aerodynamic performance of axial fans/compressors

    Science.gov (United States)

    Gui, Xingmin; Zhu, Fang; Wan, Ke; Jin, Donghai

    2013-10-01

    Swept blades have been widely used in the transonic fan/compressor of aircraft engines with the aids of 3D CFD simulation since the design concept of controlling the shock structure was firstly proposed and successfully tested by Dr. Wennerstrom in the 1980s. However, some disadvantage phenomenon has also been induced by excessively 3D blade geometries on the structure stress insufficiency, vibration and reliability. Much confusion in the procedure of design practice leading us to recognize a new view on the flow mechanism of sweep aerodynamical induction: the new radial equilibrium established by the influence of inlet circumferential fluctuation (CF) changes the inlet flows of blading and induces the performance modification of axial fans/compressors blade. The view is verified by simplified models through numerical simulation and circumferentially averaged analysis in the present paper. The results show that the CF source items which originate from design parameters, such as the spanwise distributions of the loading and blading geometries, contribute to the changing of averaged incidence spanwise distribution, and further more affect the performance of axial fans/compressors with swept blades.

  7. COMPUTATIONAL AND EXPERIMENTAL STUDY ON TIP LEAKAGE VORTEX OF CIRCUMFERENTIAL SKEWED BLADES

    Institute of Scientific and Technical Information of China (English)

    LI Yang; OUYANG Hua; DU Zhaohui

    2007-01-01

    In the steady operation condition, the experiments and the numerical simulations are used to investigate the tip leakage flow fields in three low pressure axial flow fans with three kinds of circumferential skewed rotors, including the radial rotor, the forward-skewed rotor and the backward-skewed rotor. The three-dimensional viscous flow fields of the fans are computed. In the experiments, the two-dimensional plane particle image velocimetry (PIV) system is used to measure the flow fields in the tip region of three different pitchwise positions of each fan. The results show that the computational results agree well with the experimental data in the flow field of the tip region of each fan. The tip leakage vortex core segments based on method of the eigenmode analysis can display clearly some characteristics of the tip leakage vortex, such as the origination position of tip leakage vortex, the development of vortex strength, and so on. Compared with the radial rotor, the other two skewed rotors can increase the stability of the tip leakage vortex and the increment in the forward-skewed rotor is more than that in the backward-skewed one. Among the tip leakage vortices of the three rotors, the velocity of the vortex in the forward-skewed rotor is the highest in the circumferential direction and the lowest in the axial direction.

  8. Recent evaluations of crack-opening-area in circumferentially cracked pipes

    Energy Technology Data Exchange (ETDEWEB)

    Rahman, S.; Brust, F.; Ghadiali, N.; Wilkowski, G.; Miura, N.

    1997-04-01

    Leak-before-break (LBB) analyses for circumferentially cracked pipes are currently being conducted in the nuclear industry to justify elimination of pipe whip restraints and jet shields which are present because of the expected dynamic effects from pipe rupture. The application of the LBB methodology frequently requires calculation of leak rates. The leak rates depend on the crack-opening area of the through-wall crack in the pipe. In addition to LBB analyses which assume a hypothetical flaw size, there is also interest in the integrity of actual leaking cracks corresponding to current leakage detection requirements in NRC Regulatory Guide 1.45, or for assessing temporary repair of Class 2 and 3 pipes that have leaks as are being evaluated in ASME Section XI. The objectives of this study were to review, evaluate, and refine current predictive models for performing crack-opening-area analyses of circumferentially cracked pipes. The results from twenty-five full-scale pipe fracture experiments, conducted in the Degraded Piping Program, the International Piping Integrity Research Group Program, and the Short Cracks in Piping and Piping Welds Program, were used to verify the analytical models. Standard statistical analyses were performed to assess used to verify the analytical models. Standard statistical analyses were performed to assess quantitatively the accuracy of the predictive models. The evaluation also involved finite element analyses for determining the crack-opening profile often needed to perform leak-rate calculations.

  9. Smooth muscle-like tissue constructs with circumferentially oriented cells formed by the cell fiber technology.

    Directory of Open Access Journals (Sweden)

    Amy Y Hsiao

    Full Text Available The proper functioning of many organs and tissues containing smooth muscles greatly depends on the intricate organization of the smooth muscle cells oriented in appropriate directions. Consequently controlling the cellular orientation in three-dimensional (3D cellular constructs is an important issue in engineering tissues of smooth muscles. However, the ability to precisely control the cellular orientation at the microscale cannot be achieved by various commonly used 3D tissue engineering building blocks such as spheroids. This paper presents the formation of coiled spring-shaped 3D cellular constructs containing circumferentially oriented smooth muscle-like cells differentiated from dedifferentiated fat (DFAT cells. By using the cell fiber technology, DFAT cells suspended in a mixture of extracellular proteins possessing an optimized stiffness were encapsulated in the core region of alginate shell microfibers and uniformly aligned to the longitudinal direction. Upon differentiation induction to the smooth muscle lineage, DFAT cell fibers self-assembled to coiled spring structures where the cells became circumferentially oriented. By changing the initial core-shell microfiber diameter, we demonstrated that the spring pitch and diameter could be controlled. 21 days after differentiation induction, the cell fibers contained high percentages of ASMA-positive and calponin-positive cells. Our technology to create these smooth muscle-like spring constructs enabled precise control of cellular alignment and orientation in 3D. These constructs can further serve as tissue engineering building blocks for larger organs and cellular implants used in clinical treatments.

  10. Fracture behavior of circumferentially surface-cracked elbows. Technical report, October 1993--March 1996

    International Nuclear Information System (INIS)

    This report presents the results from Task 2 of the Second International Piping Integrity Research Group (IPIRG-2) program. The focus of the Task 2 work was directed towards furthering the understanding of the fracture behavior of long-radius elbows. This was accomplished through a combined analytical and experimental program. J-estimation schemes were developed for both axial and circumferential surface cracks in elbows. Large-scale, quasi-static and dynamic, pipe-system, elbow fracture experiments under combined pressure and bending loads were performed on elbows containing an internal surface crack at the extrados. In conjunction with the elbow experiments, material property data were developed for the A106-90 carbon steel and WP304L stainless steel elbow materials investigated. A comparison of the experimental data with the maximum stress predictions using existing straight pipe fracture prediction analysis methods, and elbow fracture prediction methods developed in this program was performed. This analysis was directed at addressing the concerns regarding the validity of using analysis predictions developed for straight pipe to predict the fracture stresses of cracked elbows. Finally, a simplified fitting flaw acceptance criteria incorporating ASME B2 stress indices and straight pipe, circumferential-crack analysis was developed

  11. Effects of circumferential rigid wrist orthoses in rehabilitation of patients with radius fracture at typical site

    Directory of Open Access Journals (Sweden)

    Đurović Aleksandar

    2005-01-01

    Full Text Available Background. The use of orthoses is a questionable rehabilitation method for patients with the distal radius fracture at typical site. The aim of this study was to compare the effects of the rehabilitation on patients with radius fracture at the typical site, who wore circumferential static wrist orthoses, with those who did not wear them. Methods. Thirty patients were divided into 3 equal groups, 2 experimental groups, and 1 control group. The patients in the experimental groups were given the rehabilitation program of wearing serially manufactured (off-the-shelf, as well as custom-fit orthoses. Those in the control group did not wear wrist orthoses. Evaluation parameters were pain, edema, the range of the wrist motion, the quality of cylindrical, spherical, and pinch-spherical grasp, the strength of pinch and hand grasp, and patient's assessment of the effects of rehabilitation. Results. No significant difference in the effects of rehabilitation on the patients in experimental groups as opposed to control group was found. Patients in the first experimental group, and in control group were more satisfied with the effects of rehabilitation, as opposed to the patients in the second experimental group (p<0,05. Conclusion. The effects of circumferential static wrist orthoses in the rehabilitation of patients with distal radius fracture at the typical site were not clinically significant. There was no significant difference between the custom and off-the-shelf orthoses.

  12. Status of the steam generator tube circumferential ODSCC degradation experienced at the Doel 4 plant

    Energy Technology Data Exchange (ETDEWEB)

    Roussel, G. [AIB-Vincotte Nuclear, Brussels (Belgium)

    1997-02-01

    Since the 1991 outage, the Doel Unit 4 nuclear power plant is known to be affected by circumferential outside diameter intergranular stress corrosion cracking at the hot leg tube expansion transition. Extensive non destructive examination inspections have shown the number of tubes affected by this problem as well as the size of the cracks to have been increasing for the three cycles up to 1993. As a result of the high percentage of tubes found non acceptable for continued service after the 1993 in-service inspection, about 1,700 mechanical sleeves were installed in the steam generators. During the 1994 outage, all the tubes sleeved during the 1993 outage were considered as potentially cracked to some extent at the upper hydraulic transition and were therefore not acceptable for continued service. They were subsequently repaired by laser welding. Furthermore all the tubes not sleeved during the 1993 outage were considered as not acceptable for continued service and were repaired by installing laser welded sleeves. During the 1995 outage, some unexpected degradation phenomena were evidenced in the sleeved tubes. This paper summarizes the status of the circumferential ODSCC experienced in the SG tubes of the Doel 4 plant as well as the other connected degradation phenomena.

  13. Experimental investigation on circumferential and axial temperature gradient over fuel channel under LOCA

    Science.gov (United States)

    Yadav, Ashwini Kumar; kumar, Ravi; Gupta, Akhilesh; Chatterjee, Barun; Mukhopadhyay, Deb; Lele, H. G.

    2014-06-01

    In a nuclear reactor temperature rises drastically in fuel channels under loss of coolant accident due to failure of primary heat transportation system. Present investigation has been carried out to capture circumferential and axial temperature gradients during fully and partially voiding conditions in a fuel channel using 19 pin fuel element simulator. A series of experiments were carried out by supplying power to outer, middle and center rods of 19 pin fuel simulator in ratio of 1.4:1.1:1. The temperature at upper periphery of pressure tube (PT) was slightly higher than at bottom due to increase in local equivalent thermal conductivity from top to bottom of PT. To simulate fully voided conditions PT was pressurized at 2.0 MPa pressure with 17.5 kW power injection. Ballooning initiated from center and then propagates towards the ends and hence axial temperature difference has been observed along the length of PT. For asymmetric heating, upper eight rods of fuel simulator were activated and temperature difference up-to 250 °C has been observed from top to bottom periphery of PT. Such situation creates steep circumferential temperature gradient over PT and could lead to breaching of PT under high pressure.

  14. Transmit-receive eddy current probes for circumferential cracks in heat exchanger tubes

    International Nuclear Information System (INIS)

    Conventional eddy current bobbin probes are known to be ineffectual in detecting circumferential cracks in tubing. Multi-pancake and/or rotating pancake probes are required to detect circumferential cracks. It has recently been demonstrated in CANDU steam generator tubes, with deformation, ferromagnetic deposits, and copper deposits, that multi-channel probes with transmit-receive (T/R) coils are superior to those using surface impedance coils. Unlike rotating probes, the design of a new probe denoted as C3 permits fast, single-scan inspection of a full-length tube at inspection speeds comparable to conventional bobbin probes. Since 1992, the probe has been used routinely for steam generator in-service inspection at 4 CANDU plants. Defective tubes have been plugged and the units returned to service, and they continue to operate without leaks. This paper describes the basic features of T/R surface probes. Two-dimensional voltage diagrams showing computer-derived probe response to frequency, lift-off, carbon steel supports, magnetite deposits and copper deposits are presented and compared with corresponding signals from impedance coils. Theoretical and experimental results show that T/R probes are able to detect defects in the presence of variable lift-off (due to tube-wall deformation) with ten times the signal-to-noise ratio as that exhibited by comparable pancake-type impedance probes. In addition, T/R probes are less sensitive to magnetite deposits, and possess good phase discrimination to internal defects

  15. Fracture behavior of circumferentially surface-cracked elbows. Technical report, October 1993--March 1996

    Energy Technology Data Exchange (ETDEWEB)

    Kilinski, T.; Mohan, R.; Rudland, D.; Fleming, M. [and others

    1996-12-01

    This report presents the results from Task 2 of the Second International Piping Integrity Research Group (IPIRG-2) program. The focus of the Task 2 work was directed towards furthering the understanding of the fracture behavior of long-radius elbows. This was accomplished through a combined analytical and experimental program. J-estimation schemes were developed for both axial and circumferential surface cracks in elbows. Large-scale, quasi-static and dynamic, pipe-system, elbow fracture experiments under combined pressure and bending loads were performed on elbows containing an internal surface crack at the extrados. In conjunction with the elbow experiments, material property data were developed for the A106-90 carbon steel and WP304L stainless steel elbow materials investigated. A comparison of the experimental data with the maximum stress predictions using existing straight pipe fracture prediction analysis methods, and elbow fracture prediction methods developed in this program was performed. This analysis was directed at addressing the concerns regarding the validity of using analysis predictions developed for straight pipe to predict the fracture stresses of cracked elbows. Finally, a simplified fitting flaw acceptance criteria incorporating ASME B2 stress indices and straight pipe, circumferential-crack analysis was developed.

  16. Effects of steroids and angiotensin converting enzyme inhibition on circumferential strain in boys with Duchenne muscular dystrophy: a cross-sectional and longitudinal study utilizing cardiovascular magnetic resonance

    Directory of Open Access Journals (Sweden)

    Kinnett Kathi J

    2011-10-01

    Full Text Available Abstract Background Steroid use has prolonged ambulation in Duchenne muscular dystrophy (DMD and combined with advances in respiratory care overall management has improved such that cardiac manifestations have become the major cause of death. Unfortunately, there is no consensus for DMD-associated cardiac disease management. Our purpose was to assess effects of steroid use alone or in combination with angiotensin converting enzyme inhibitors (ACEI or angiotension receptor blocker (ARB on cardiovascular magnetic resonance (CMR derived circumferential strain (εcc. Methods We used CMR to assess effects of corticosteroids alone (Group A or in combination with ACEI or ARB (Group B on heart rate (HR, left ventricular ejection fraction (LVEF, mass (LVM, end diastolic volume (LVEDV and circumferential strain (εcc in a cohort of 171 DMD patients >5 years of age. Treatment decisions were made independently by physicians at both our institution and referral centers and not based on CMR results. Results Patients in Group A (114 studies were younger than those in Group B (92 studies(10 ± 2.4 vs. 12.4 ± 3.2 years, p cc magnitude was lower in Group B than Group A (-13.8 ± 1.9 vs. -12.8 ± 2.0, p = 0.0004, age correction using covariance analysis eliminated this effect. In a subset of patients who underwent serial CMR exams with an inter-study time of ~15 months, εcc worsened regardless of treatment group. Conclusions These results support the need for prospective clinical trials to identify more effective treatment regimens for DMD associated cardiac disease.

  17. Burst fracture of the thoracolumbar spine: correlation between kyphosis and clinical result of the treatment

    Directory of Open Access Journals (Sweden)

    Rodrigo Arnold Tisot

    2015-06-01

    Full Text Available OBJECTIVE: To evaluate the correlation between kyphosis due to burst fractures of thoracic and lumbar spine and clinical outcome in patients undergoing conservative or surgical treatment.METHODS: A retrospective, cross-sectional study was conducted with 29 patients with thoracolumbar burst fractures treated by the Spine Group in a trauma reference hospital between the years 2002 and 2011. Patients were followed-up as outpatients for a minimum of 24 months. All cases were clinically evaluated by Oswestry and SF-36 quality of life questionnaires and the visual analogue scale (VAS of pain. They were also evaluated by X-ray examinations and CT scans of the lumbosacral spine at the time of hospitalization and subsequently as outpatients by Cobb method for measuring the degree of kyphosis.RESULTS: There was no statistically significant correlation between the degree of initial kyphosis and clinical outcome measured by VAS and by most of the SF-36 domains in both patients treated conservatively and the surgically treated. The Oswestry questionnaire showed benefits for patients who received conservative treatment (p=0.047 compared to those surgically treated (p=0.335. The analysis of difference between initial and final kyphosis and final kyphosis alone in relation to clinical outcome showed no statistical correlation in any of the scores used.CONCLUSION: The clinical outcome of treatment of the thoracic and lumbar burst fractures was not influenced by a greater or lesser degree of initial or residual kyphosis, regardless of the type of treatment.

  18. Blood supply to the thoracolumbar spinal cord in the laboratory mouse using corrosion and dissection techniques.

    Science.gov (United States)

    Flesarova, Slavka; Mazensky, David; Teleky, Jana; Almasiova, Viera; Holovska, Katarina; Supuka, Peter

    2016-01-01

    Mice are used frequently as experimental models in the study of ischemic spinal cord injury. The aim of the present study was to describe the arterial blood supply to the thoracolumbar spinal cord in the mouse. The study was carried out on 20 adult mice using the corrosion and dissection technique. Dorsal intercostal arteries were found as branches of the thoracic aorta: as 7 pairs in 80% of cases, as 8 pairs in 15% of cases and as 9 pairs in 5% of cases. The paired lumbar arteries arising from the abdominal aorta were present as 5 pairs in all cases. Along the entire thoracic and lumbar spinal regions, we observed left-sided branches entering the ventral spinal artery in 64.2% and right-sided branches in 35.8% of cases. Along the entire thoracic and lumbar spinal regions, the branches entering the dorsal spinal arteries were left-sided in 60.8% of cases and right-sided in 39.2% of cases. We found some variations in the site of origin of the artery of Adamkiewicz and in the number of dorsal spinal arteries. Documenting the anatomical variations in spinal cord blood supply in the laboratory mouse will aid the planning of future experimental studies and in determining the clinical relevance of such studies.

  19. Use of tranexamic acid for controlling bleeding in thoracolumbar scoliosis surgery with posterior instrumentation

    Directory of Open Access Journals (Sweden)

    Vinícius Magno da Rocha

    2015-04-01

    Full Text Available OBJECTIVE: Scoliosis surgery involves major blood loss and frequently requires blood transfusion. The cost and risks involved in using allogeneic blood have motivated investigation of methods capable of reducing patients' bleeding during operations. One of these methods is to use antifibrinolytic drugs, and tranexamic acid is among these. The aim of this study was to assess the use of this drug for controlling bleeding in surgery to treat idiopathic scoliosis.METHODS: This was a retrospective study in which the medical files of 40 patients who underwent thoracolumbar arthrodesis by means of a posterior route were analyzed. Of these cases, 21 used tranexamic acid and were placed in the test group. The others were placed in the control group. The mean volumes of bleeding during and after the operation and the need for blood transfusion were compared between the two groups.RESULTS: The group that used tranexamic acid had significantly less bleeding during the operation than the control group. There was no significant difference between the groups regarding postoperative bleeding and the need for blood transfusion.CONCLUSIONS: Tranexamic acid was effective in reducing bleeding during the operation, as demonstrated in other studies. The correlation between its use and the reduction in the need for blood transfusion is multifactorial and could not be established in this study. We believe that tranexamic acid may be a useful resource and that it deserves greater attention in randomized double-blind prospective series, with proper control over variables that directly influence blood loss.

  20. Percutaneous kyphoplasty combined with the posterior screw-rod system in treatment of osteoporotic thoracolumbar fractures

    Directory of Open Access Journals (Sweden)

    Jiang Wu

    2013-01-01

    Materials and Methods: Twenty six patients (65 years of age or older with the single spine fractures included in study. The preoperative bone mineral density was measured by dual-energy X-ray. The PKP was done in all the cases. Decompression was done if neurological symptoms were present. Results: The results demonstrated osteoporosis with BMD T value ≤ −2.5; injured posterior vertebral body (3 cases had shown the whole damage accompanied by neurological symptoms through X-ray or CT. After 2 days, the remaining patients of back pain symptoms were relieved or disappeared except for three cases of patients with decompression incision. VAS score and Cobb angle changed from preoperative 8.23 ± 0.17 and 28.7 ± 0.33° respectively to postoperative 3.77 ± 0.44 and 3.8 ± 0.2° respectively. Conclusion: Treatment of rupture of the posterior vertebral osteoporotic thoracolumbar fractures by means of kyphoplasty combined with posterior screw-rod system is a safe, effective procedure.

  1. Tip clearance flow interaction with circumferential groove casing treatment in a transonic axial compressor

    Science.gov (United States)

    Ross, Mark Hamilton

    Experimental and computational studies were conducted to study the role of the tip leakage flow in axial compressor stall and the relationship between the tip clearance flow flow field and surge margin extension from circumferential groove casing treatment. The CFD results were used to identify the existence of an interface between the approach ow and the tip-leakage flow. The experiments used a surface streaking visualization method to identify the time-averaged location of this interface as a line of zero axial shear stress at the casing. The axial position of this line, denoted xzs, moved upstream with decreasing ow coefficient in both the experiments and computations. The line was consistently located at the rotor leading edge plane at the stalling flow coefficient, regardless of in flow boundary condition. These results were successfully modeled using a control volume approach that balanced the reverse axial momentum ux of the tip-leakage flow with the momentum flux of the approach fluid. Non-uniform tip clearance measurements demonstrated that movement of the interface upstream of the rotor leading edge plane leads to the generation of short length scale rotating disturbances. Therefore, stall was interpreted as a critical point in the momentum flux balance of the approach ow and the reverse axial momentum flux of the tip-leakage flow. Experimental measurements of surge margin extension from seven CGCT configurations with a fixed groove geometry demonstrated that the contribution of individual grooves in a multi-groove casing to surge margin extension is an (a) additive and (b) linear function of the smooth wall tip clearance axial momentum ux at the location of a each groove. Extending the axial momentum model to include the in uence of a CGCT showed that circumferential grooves reduce the tip leakage flow axial momentum through radial transport. The equivalent force due to a circumferential groove was demonstrated to be related to the smooth wall tip

  2. Reduction of longitudinal axial residual stresses in near-root region of circumferential joint of steam pipeline in technological way

    Directory of Open Access Journals (Sweden)

    V. M. Prokhorenko

    2013-10-01

    Full Text Available The paper proposes a variant for solving the problem of reduction of longitudinal residual stresses in near-root region of a circumferential welded joint of section of steam pipeline by FEM simulation of the stress-strain state of repaired section of a circumferential weld in the zone of lack of root penetration on a thin-wall shell of 89 mm diameter and 6 mm wall thickness from steel 20. The result of solving the problem is total distribution of stresses and residual plastic deformations in the repaired zone.

  3. The Mechanism of Stall Margin Improvement in a Centrifugal Compressor with the Air Bleeding Circumferential Grooves Casing Treatment

    Science.gov (United States)

    Gao, P.; Chu, W. L.; Wu, Y. H.

    The air bleeding circumferential grooves casing treatment has the potential to extent the operating range of centrifugal compressor with no loss in efficiency. A time accurate 3-dimentional numerical simulation was performed in a low speed centrifugal compressor with the air bleeding circumferential grooves casing treatment. The numerical results agreed well with experimental test data for the global performance. Detailed analyses of the flow visualization at the tip of blades have exposed the different tip flow topologies between the cases with casing treatment and with untreated smooth wall, and the reasons how the second flow vortex is retrained. The mechanism of stall margin improvement is gained finally.

  4. Advocating "spine damage control" as a safe and effective treatment modality for unstable thoracolumbar fractures in polytrauma patients: a hypothesis

    Directory of Open Access Journals (Sweden)

    Beauchamp Kathryn M

    2009-05-01

    Full Text Available Abstract Background The "ideal" timing and modality of fracture fixation for unstable thoracolumbar spine fractures in multiply injured patients remains controversial. The concept of "damage control orthopedics" (DCO, which has evolved globally in the past decade, provides a safe guidance for temporary external fixation of long bone or pelvic fractures in multisystem trauma. In contrast, "damage control" concepts for unstable spine injuries have not been widely implemented, and the scarce literature in the field remains largely anecdotal. The current practice standards are reflected by two distinct positions, either (1 immediate "early total care" or (2 delayed spine fixation after recovery from associated injuries. Both concepts have inherent risks which may contribute to adverse outcome. Presentation of hypothesis We hypothesize that the concept of "spine damage control" – consisting of immediate posterior fracture reduction and instrumentation, followed by scheduled 360° completion fusion during a physiological "time-window of opportunity" – will be associated with less complications and improved outcomes of polytrauma patients with unstable thoracolumbar fractures, compared to conventional treatment strategies. Testing of hypothesis We propose a prospective multicenter trial on a large cohort of multiply injured patients with an associated unstable thoracolumbar fracture. Patients will be assigned to one of three distinct study arms: (1 Immediate definitive (anterior and/or posterior fracture fixation within 24 hours of admission; (2 Delayed definitive (anterior and/or posterior fracture fixation at > 3 days after admission; (3 "Spine damage control" procedure by posterior reduction and instrumentation within 24 hours of admission, followed by anterior 360° completion fusion at > 3 days after admission, if indicated. The primary and secondary endpoints include length of ventilator-free days, length of ICU and hospital stay, mortality

  5. An expert consensus on the evaluation and treatment of acute thoracolumbar spine and spinal cord injury in China

    Institute of Scientific and Technical Information of China (English)

    Zhicheng Zhang; Fang Li; Tiansheng Sun

    2013-01-01

    This is an expert consensus on the evaluation and treatment of thoracolumbar spinal injury, estab-lished from February 2009 to July 2010. The expert consensus consists mainly of six parts with a total of 54 recommendations including the overview (one item);pre-hospital care (one item);evalu-ation and diagnosis (13 items);treatment (23 items); prevention and treatment of major complica-tions (12 items);and rehabilitation (four items). This is the first time that Chinese experts have pub-lished a consensus on spine and spinal cord injury. The expert consensus was established based on Delphi methods, literature analysis, and clinical experiences. Each recommendation is supported by and was interpreted using multi-level evidences. The level of agreement with the recommenda-tion among the panel members was assessed as either low, moderate, or strong. Each panel member was asked to indicate his or her level of agreement on a 5-point scale, with “1” corre-sponding to neutrality and“5”representing maximum agreement. Scores were aggregated across the panel members and an arithmetic mean was calculated. This mean score was then translated into low, moderate, or strong. After al of the votes were col ected and calculated, the results showed no low-level recommendations, 10 moderate-level recommendations, and 44 strong-level recom-mendations. An expert consensus was reached and was recognized by Chinese spine surgeons. Wide-scale adoption of these recommendations is urgent in the management of acute thoracol-umbar spine and spinal cord injury in a broader attempt to create a standard evaluation and treat-ment strategy for acute thoracolumbar spine and spinal cord injury in China.

  6. Sensory findings after stimulation of the thoracolumbar fascia with hypertonic saline suggest its contribution to low back pain.

    Science.gov (United States)

    Schilder, Andreas; Hoheisel, Ulrich; Magerl, Walter; Benrath, Justus; Klein, Thomas; Treede, Rolf-Detlef

    2014-02-01

    Injection of hypertonic saline into deep tissues of the back (subcutis, muscle, or the surrounding fascia) can induce acute low back pain (LBP). So far, no study has analyzed differences in temporal, qualitative, and spatial pain characteristics originating from these tissues. The current study aimed to investigate the role of the thoracolumbar fascia as a potential source of LBP. In separate sessions, 12 healthy subjects received ultrasound-guided bolus injections of isotonic saline (0.9%) or hypertonic saline (5.8%) into the erector spinae muscle, the thoracolumbar fascia (posterior layer), and the overlying subcutis. Subjects were asked to rate pain intensity, duration, quality, and spatial extent. Pressure pain thresholds were determined pre and post injection. Injections of hypertonic saline into the fascia resulted in significantly larger area under the curve of pain intensity over time than injections into subcutis (P<0.01) or muscle (P<0.001), primarily based on longer pain durations and, to a lesser extent, on higher peak pain ratings. Pressure hyperalgesia was only induced by injection of hypertonic saline into muscle, but not fascia or subcutis. Pain radiation and pain affect evoked by fascia injection exceeded those of the muscle (P<0.01) and the subcutis significantly (P<0.05). Pain descriptors after fascia injection (burning, throbbing, and stinging) suggested innervation by both A- and C-fiber nociceptors. These findings show that the thoracolumbar fascia is the deep tissue of the back that is most sensitive to chemical stimulation, making it a prime candidate to contribute to nonspecific LBP but not to localized pressure hyperalgesia. PMID:24076047

  7. One-stage posterior debridement, bone grafting and internal fixation for thoracolumbar spinal tuberculosis%一期后路病灶清除植骨融合内固定治疗胸腰椎结核

    Institute of Scientific and Technical Information of China (English)

    任之强; 丁金勇; 晋大祥; 庄洪; 万梓成

    2014-01-01

    Objective To evaluate the clinical efficacy of one-stage posterior debridement, bone grafting and internal fixation for thoracolumbar spinal tuberculosis.Methods From January 2010 to June 2012,28 patients with thoracolumbar spinal tuberculosis undergoing one-stage posterior debridement, bone grafting and internal fixation procedure were reviewed retrospectively .All cases were followed up.The kyphosis Cobb’s angle, erythrocyte sedimentation rate (ESR), C-reaction protein (CRP), bone fusion and American Spinal Injury Association (ASIA) grade before and after surgery were reviewed and compared.Results The median peri-od of follow-up was 1.2 years.There was no significant loss of kyphosis Cobb’s angle after operation.The average kyphosis Cobb’s angle was corrected 4.12 °, the average correction rate was 24.5%.The ESR and CRP levels returned to normal at final follow-up. The majority of bony fusion was achieved within 7.8 months.Most of the original symptoms disappeared.According to ASIA grade, the neurological function was improved after operation.Conclusion Treatments with one-stage posterior debridement, bone grafting and internal fixation for thoracolumbar spinal tuberculosis can effectively achieve debridement, spinal cord decompression, correc-tion of spinal kyphosis, reconstruction of spinal stability.%目的:探讨一期后路病灶清除植骨融合内固定治疗胸腰椎结核的临床疗效。方法回顾性分析2010年1月~2012年6月本院采用一期后路病灶清除植骨融合内固定治疗的28例胸腰椎结核患者的临床资料,对比研究患者手术前后患椎后凸Cobb角、红细胞沉降率( erythrocyte sedimentation rate, ESR)、C 反应蛋白( C-reaction protein, CRP)、植骨融合及美国脊髓损伤协会( American Spinal Injury Association, ASIA)分级变化情况。结果28例获得随访,平均随访1.2年,术后Cobb角无明显丢失,后凸畸形平均纠正4.12°,平均矫正率24

  8. Clinical study on the application of minimally invasive percutaneous pedicle screw fixation in single segment thoracolumbar fracture without neurological symptoms

    Directory of Open Access Journals (Sweden)

    Jin-ping LIU

    2016-04-01

    Full Text Available Objective To discuss the clinical effects of minimally invasive percutaneous pedicle screw fixation in the treatment of single segment thoracolumbar fracture without neurological symptoms.  Methods From June 2012 to October 2014, 38 neurologically intact patients with thoracolumbar fracture underwent surgeries, including open pedicle screw fixation in 16 cases and percutaneous pedicle screw fixation in 22 cases. The incision length, operation time, intraoperative blood loss, postoperative drainage and postoperative complication were recorded and compared between 2 groups. Thoracolumbar orthophoric, lateral and flexion-extension X-ray was used to measure sagittal Cobb angle and height of injured anterior vertebral body before and after operation. Modified Macnab evaluation was used to assess the curative effects 3 months after operation. Results The success rate of operations in 38 patients was 100%. There were a total of 114 vertebral bodies fused and 228 pedicle screws implanted. Patients in the percutaneous pedicle screw group had smaller incision length [(10.55 ± 1.23 cm vs (18.50 ± 2.50 cm, P = 0.000], less intraoperative blood loss [(32.55 ± 7.22 ml vs (320.50 ± 15.48 ml, P = 0.000], shorter hospital stay [(6.55 ± 1.50 d vs (13.50 ± 2.52 d, P = 0.000], and without postoperative drainage. The follow-up after operation ranged from 3 to 6 months, with the average time of (4.65 ± 1.24 months. Cobb angle was reduced (P = 0.000 and height of injured anterior vertebral body were improved signifcantly (P = 0.000 3 months after surgery in both groups. The total effective rate was 14/16 in open surgery group, and 86.36% (19/22 in percutaneous pedicle screw group, however, the difference between 2 groups was not significant (P = 1.000. Conclusions Minimally invasive percutaneous pedicle screw fixation is a surgical method with less iatrogenic injury, less intraoperative blood loss and quick recovery for patients with thoracolumbar fracture

  9. Crack shape developments and leak rates for circumferential complex-cracked pipes

    Energy Technology Data Exchange (ETDEWEB)

    Brickstad, B.; Bergman, M. [SAQ Inspection Ltd., Stockholm (Sweden)

    1997-04-01

    A computerized procedure has been developed that predicts the growth of an initial circumferential surface crack through a pipe and further on to failure. The crack growth mechanism can either be fatigue or stress corrosion. Consideration is taken to complex crack shapes and for the through-wall cracks, crack opening areas and leak rates are also calculated. The procedure is based on a large number of three-dimensional finite element calculations of cracked pipes. The results from these calculations are stored in a database from which the PC-program, denoted LBBPIPE, reads all necessary information. In this paper, a sensitivity analysis is presented for cracked pipes subjected to both stress corrosion and vibration fatigue.

  10. Analysis of parameters likely to explain the secondary side circumferential cracking of steam generator

    International Nuclear Information System (INIS)

    In 1990, a new type of damage mechanism was brought to light by means of eddy current inspections in Steam Generator (SG) tube bundle. This is circumferential cracking, started on the outer wall of the tubes. These cracks generally appear below the level of the tube sheet. By the end of 1993, 89 tubes with this king of damage were discovered in the French nuclear power plants: 85 of these were located on the 6 SG's of 2 units of Dampierre. We present here the work carried out to provide better understanding of this phenomenon. It involves statistical analysis of data from experience feedback, together with analysis of the thermohydraulic conditions found on the tube sheet. (authors). 8 figs., 2 refs

  11. Circumferential resonance modes of solid elastic cylinders excited by obliquely incident acoustic waves.

    Science.gov (United States)

    Fan, Ying; Honarvar, Farhang; Sinclair, Anthony N; Jafari, Mohammad-Reza

    2003-01-01

    When an immersed solid elastic cylinder is insonified by an obliquely incident plane acoustic wave, some of the resonance modes of the cylinder are excited. These modes are directly related to the incidence angle of the insonifying wave. In this paper, the circumferential resonance modes of such immersed elastic cylinders are studied over a large range of incidence angles and frequencies and physical explanations are presented for singular features of the frequency-incidence angle plots. These features include the pairing of one axially guided mode with each transverse whispering gallery mode, the appearance of an anomalous pseudo-Rayleigh in the cylinder at incidence angles greater than the Rayleigh angle, and distortional effects of the longitudinal whispering gallery modes on the entire resonance spectrum of the cylinder. The physical explanations are derived from Resonance Scattering Theory (RST), which is employed to determine the interior displacement field of the cylinder and its dependence on insonification angle.

  12. Development of circumferential seal for helicopter transmissions: Results of bench and flight tests

    Science.gov (United States)

    Strom, T. N.; Ludwig, L. P.

    1975-01-01

    A modified circumferential segmented ring seal was designed for direct replacement of a helicopter transmission elastomeric lip seal operating on a shaft diameter of 13.91 centimeters (5.481 in.) at sliding velocities to 52.48 m/sec (10 330 ft/min). The modifications involved the garter spring tension, shaft roundness, seal housing flatness, and pumping grooves to inhibit leakage. Operation of the seals in bench tests under simulated helicopter transmission conditions revealed that the seal leakage rate was within acceptable limits and that the wear rate was negligible. The low leakage and wear rates were confirmed in flight tests of 600 and 175 hours (sliding speed, 48.11 m/sec (9470 ft/min)). An additional 200 hours of air worthiness qualification testing (aircraft tie down) demonstrated that the seal can operate at the advanced sliding conditions of 52.48 m/sec (10 330 ft/min).

  13. Lower bound limit load of a circumferentially cracked pipe under combined mechanical loading

    International Nuclear Information System (INIS)

    In a study on extension of the reference stress method, for J simplified assessment, to a three dimensional (3D) configuration under combined loading, lower bound limit analysis has been developed by J. Desquines. In the present paper the limit load for cracked pipe, with a 3D circumferential flaw, under pressure, tension and bending is detailed. The limit load is explicitly defined as a yield surface is the 3D space loading. A simple algorithm is proposed to solve the non linear problem associated to the reference stress calculation. Moreover, the lower bound solution is compared with elastic compensation method (ECM) results computed on a 3D finite element mesh of the cracked pipe. The lower bound yield surface underestimates the numerical limit loads with a discrepancy lower than 20%. (orig.)

  14. Quantitative lymphoscintigraphy in post-mastectomy lymphedema: correlation with circumferential measurements

    Energy Technology Data Exchange (ETDEWEB)

    Choi, Joon Young; Lee, Kyung Han; Kim, Sang Eun; Kim, Byung Tae; Hwang, Jee Hea; Lee, Byung Boong [Samsung Medical Center, Seoul (Korea, Republic of)

    1997-07-01

    An objective measure for the severity and progression is important for the management of lymphedema. To evaluate the usefulness of lympho-scintigraphy in this regard, we compared various quantitative indices from upper extremity lymphoscintigraphy with circumferential measurements, before and after physiotheraphy. Upper extremity lymphoscintigraphy was performed in 38 patients with unilateral postmastectomy lymphedema. Tc-99m antimony sulfide colloid (37 MBq) was injected s.c. into the second and third interdigital spaces. The injection sites were imaged immediately after injection. After standardized exercise for 15 min, upper extremity images were acquired 30 min, 1 hr and 2 hr after injection. The clearance of the injection site (CL), and % uptake in regional lymph nodes (%LN) and soft tissue of the extremity (i.e., the degree of dermal backflow) (%EXT) compared to the initial injection site were calculated. Circumference of each extremity was measured at 7 levels; the severity of lymphedema was expressed as the percentage difference of total circumferential difference (TCD) between healthy and edematous extremities compared to the total circumference of healthy extremity (%TCD). In 19 patients who received physiotherapy, the therapeutic effect was measured by % decrease of TCD (%DTCD) before and after therapy (Raines. et al., 1977). The quantitative indices calculated in the image at 2 hr p.i. had better correlation with either %TCD or %DTCD than those from earlier images (Table). The CL, %LN and %EXT of edematous extremity had a significant correlation with TCD. The %EXT was correlated best with either TCD or %DTCD. The results suggest that the %EXT which corresponds to the degree of dermal backflow may be a simple and useful quantitative index for evaluating the severity and progression in lymphedema and predicting the effect of therapy.

  15. Response of thoracolumbar vertebral bodies to high rate compressive loading - biomed 2013.

    Science.gov (United States)

    Dooley, C J; Wester, B A; Wing, I D; Voo, L M; Armiger, R S; Merkle, A C

    2013-01-01

    Underbody blast (UBB) events created by improvised explosive devices are threats to warfighter survivability. High intensity blast waves emitted from these devices transfer large forces through vehicle structures to occupants, often resulting in injuries including debilitating spinal fractures. The vertical loading vector through the spine generates significant compressive forces at high strain rates. To better understand injury mechanisms and ultimately better protect vehicle occupants against UBB attacks, high-fidelity computational models are being developed to predict the human response to dynamic loading characteristic of these events. This effort details the results from a series of 23 high-rate compression tests on vertebral body specimen. A high-rate servo-hydraulic test system applied a range of compressive loading rates (.01 mm/s to 1238 mm/s) to vertebral bodies in the thoracolumbar region (T7-L5). The force-deflection curves generated indicate rate dependent sensitivity of vertebral stiffness, ultimate load and ultimate deflection. Specimen subjected to high-rate dynamic loading to failure experienced critical structural damage at 5.5% ± 2.1% deflection. Compared to quasi-static loading, vertebral bodies had greater stiffness, greater force to failure, and lower ultimate failure deflection at high rates. Post-failure, an average loss in height of 15% was observed, along with a mean reduction in strength of 48%. The resulting data from these tests will allow for enhanced biofidelity of computational models by characterizing the vertebral stiffness response and ultimate deflection at rates representative of UBB events. PMID:23686197

  16. MORPHOMETRIC AND MORPHOLOGICAL STUDY OF ARTICULAR FACETS OF THE THORACOLUMBAR VERTEBRAL COLUMN IN NORTH INDIAN POPULATION

    Directory of Open Access Journals (Sweden)

    Rimpi Gupta

    2015-09-01

    Full Text Available Background: The articular processes of thoracolumbar vertebral column play an important role in weight transmission and determining the range and direction of movements between any two vertebrae. Size of these facets has been correlated with the magnitude of stress imposed on them. Purpose of study: The present study has been conducted on the articular processes of 510 vertebrae (thoracic: 360; lumbar:150 with the aim to provide high quality data sets for constructing the models of spine to study mechanics of spinal instrumentation. The length , width and the distance between the right & left superior & inferior articular processes have been measured with the vernier callipers. The presence/ absence of mamillary tubercle has been observed in the present study. Results: The length of thoracic SAFs was almost same at all levels whereas that of the lumbar SAFs increased gradually from L1-L5. However the width showed a variable trend. In case of thoracic IAFs both these parameters showed a variable trend. Whereas in lumbar region, these increased gradually from L1-L5. The distance between two inferior articular processes was more than that between two superior articular processes at almost all levels except T1-T3 & L1-L4 where reverse was true. The mamillary tubercle/process was altogether absent from T-1 to T-8. From T-9 to T-11, the number of vertebral column showing mamillary tubercle increased from 4-19. However at T-12, it was seen in 29 Vertebral columns. In lumbar region, it was well developed in all vertebrae and termed as mamillary process. Conclusion: The measurements obtained by present study reveals the importance of articular facets in understanding basic spinal mechanics and its application with respect to weight transmission.

  17. Treatment of type A thoracolumbar fracture in a patient with ankylosing spondylitis by percutaneous kyphoplasty:1 case report%PKP 治疗强直性脊柱炎患者的A型胸腰椎骨折一例

    Institute of Scientific and Technical Information of China (English)

    陈磊; 荆珏华; 田大胜; 钱军; 朱斌

    2016-01-01

    Objective To discuss the treatment of type A thoracolumbar fracture in a patient with ankylosing spondylitis by percutaneous kyphoplasty ( PKP ).Methods A thoracolumbar fracture of a 62-year-old male patient with ankylosing spondylitis was retrospectively analyzed, including clinical manifestations and imaging data before and after the operation. Related literature was reviewed.Results Back pain was relieved significantly, and the thoracolumar imaging was good postoperatively.Conclusions The risk of thoracolunbar fracture in patients with ankylosing spondylitis is high. Misdiagnosis or delayed diagnosis often occurs. Results of conservative treatment may not be good, while PKP is effective for the treatment of type A thoracolumbar fracture.

  18. Initial experience with circumferential pulmonary vein ablation guided by fusion of magnetic resonance imaging with three-dimensional electroanatomic mapping

    Institute of Scientific and Technical Information of China (English)

    TANG Kai; MA Jian; MA Fu-sheng; JlA Yu-he; ZHANG Shu

    2006-01-01

    @@ Catheter ablation for the treatment of atrial fibrillation (AF) has been a focal target of electrophysiological study in recent years. Up to date,circumferential pulmonary vein ablation (CPVA)guided by three-dimensional (3-D) electroanatomic mapping (Carto, USA) has been one of the most favourable procedures for the treatment of AF.

  19. High speed OH-PLIF measurement of self-excited circumferential instabilities in an annular combustion chamber

    Science.gov (United States)

    Worth, Nicholas; Dawson, James

    2012-11-01

    Self-excited thermo-acoustic instabilities are a significant issue in the development of lean burn gas turbine combustors. Such instabilities arise through coupling of the unsteady heat release and acoustic waves, which can propagate both longitudinally and circumferentially in annular combustor geometries. Although a large number of studies have investigated longitudinal fluctuations in single axisymmetric flames, it is currently uncertain whether these results can be used to emulate circumferential oscillations in annular geometry. Therefore, the aim of the current project is to investigate the flame dynamics in an annular model gas turbine combustor during self-excited circumferential oscillations. Pressure measurements are used to characterise the circumferential oscillations, with high-speed OH chemiluminescence and OH-PLIF used to capture the flame dynamics. The flame structure and dynamics are significantly affected by both the proximity of neighbouring flames and the excitation mode; with different responses observed for small and large separation distances, and standing and spinning modes. These observations indicate that results from single flame investigations may only be representative of self-excited flames in annular geometry under in a limited set of conditions.

  20. Burn-out, Circumferential Film Flow Distribution and Pressure Drop for an Eccentric Annulus with Heated Rod

    DEFF Research Database (Denmark)

    Andersen, P. S.; Jensen, A.; Mannov, G.;

    1974-01-01

    Measurements of (1) burn-out, (2) circumferential film flow distribution, and (3) pressure drop in a 17 × 27.2 × 3500 mm concentric and eccentric annulus geometry are presented. The eccentric displacement was varied between 0 and 3 mm. The working fluid was water. Burn-out curves at 70 bar...... flow variation on burn-out is discussed....

  1. Circumferential electrocautery of the patella in primary total knee replacement without patellar replacement: a meta-analysis and systematic review

    Science.gov (United States)

    Fan, Lihong; Ge, Zhaogang; Zhang, Chen; Li, Jia; Yu, Zefeng; Dang, Xiaoqian; Wang, Kunzheng

    2015-03-01

    The purpose of this meta-analysis and systematic review was to identify and assess whether circumferential electrocautery is useful for improving outcomes after primary total knee replacement(TKR). We searched MEDLINE, EMBASE, PubMed, SpringerLink, Web of Knowledge, OVID CINAHL, OVID EBM and Google Scholar and included articles published through January 2014. A total of 6 articles met the inclusion criteria. Of the 776 cases included in the analysis, 388 cases involved patellar denervation, and 388 cases were designated as the control group. The meta-analysis revealed no significant difference in the incidence of anterior knee pain (AKP, p = 0.18) or in the visual analogue scale score (VAS, p = 0.23) between the two groups. In addition, AKSS Function Score indicated no significant difference between the two groups (p = 0.28). However, the OKS (p = 0.02), patellar score (p = 0.01), AKSS-Knee Score (p = 0.004), range of motion (ROM, p < 0.0001) and WOMAC Score (p = 0.0003) indicated that circumpatellarelectrocautery improved clinical outcomes compared with non-electrocautery. The results indicate that circumferential electrocautery of the patella does not significantly improve AKP compared with non-electrocautery techniques but that circumferential electrocautery significantly improves patients' knee function after surgery. Therefore, we believe that circumferential electrocautery is beneficial to the outcome of primary TKR surgery without patellar replacement.

  2. Epithelioid hemangioendothelioma and multiple thoraco-lumbar lateral meningoceles: two rare pathological entities in a patient with NF-1

    Energy Technology Data Exchange (ETDEWEB)

    Reis, C.; Carneiro, E.; Fonseca, J.; Salgado, A. [Hospital S. Joao, Departments of Neuroradiology, Porto (Portugal); Pereira, P.; Vaz, R. [Hospital S. Joao, Department of Neurosurgery, Porto (Portugal); Pinto, R. [Hospital S. Joao, Department of Orthopaedics, Porto (Portugal); Capelinha, A.F.; Lopes, J.M. [Hospital S. Joao, Department of Pathology, Porto (Portugal)

    2005-02-01

    Epithelioid hemangioendothelioma (EHE) is a rare vascular soft-tissue tumour of intermediate malignancy. Neurofibromatosis type I (NF-1) is a genetic syndrome associated with soft tissue sarcoma and higher risk of developing neoplasia. Lateral meningoceles are uncommon entities, being mostly associated with NF-1. We report a case of a 31-year-old woman, with NF-1 and past history of right thalamic/peduncular astrocytoma WHO grade II, admitted to the Neurosurgery Department in December 2003 due to severe low back pain, irradiating to the left leg without a radicular pattern. Thoraco-lumbar magnetic resonance imaging (MRI) showed a large left posterior paravertebral expansive lesion, bilateral and multiple thoraco-lumbar lateral meningoceles and dural ectasias with scalloping of the vertebral bodies. Biopsy of the paravertebral mass lesion disclosed EHE. We present this case because of the novel association between NF-1 and EHE, and the unusual aggressiveness of the neoplasia. Additionally, we highlight the co-existence of bilateral and multiple lateral meningoceles. (orig.)

  3. Ultrasound Evaluation of the Combined Effects of Thoracolumbar Fascia Injury and Movement Restriction in a Porcine Model.

    Science.gov (United States)

    Bishop, James H; Fox, James R; Maple, Rhonda; Loretan, Caitlin; Badger, Gary J; Henry, Sharon M; Vizzard, Margaret A; Langevin, Helene M

    2016-01-01

    The persistence of back pain following acute back "sprains" is a serious public health problem with poorly understood pathophysiology. The recent finding that human subjects with chronic low back pain (LBP) have increased thickness and decreased mobility of the thoracolumbar fascia measured with ultrasound suggest that the fasciae of the back may be involved in LBP pathophysiology. This study used a porcine model to test the hypothesis that similar ultrasound findings can be produced experimentally in a porcine model by combining a local injury of fascia with movement restriction using a "hobble" device linking one foot to a chest harness for 8 weeks. Ultrasound measurements of thoracolumbar fascia thickness and shear plane mobility (shear strain) during passive hip flexion were made at the 8 week time point on the non-intervention side (injury and/or hobble). Injury alone caused both an increase in fascia thickness (p = .007) and a decrease in fascia shear strain on the non-injured side (p = .027). Movement restriction alone did not change fascia thickness but did decrease shear strain on the non-hobble side (p = .024). The combination of injury plus movement restriction had additive effects on reducing fascia mobility with a 52% reduction in shear strain compared with controls and a 28% reduction compared to movement restriction alone. These results suggest that a back injury involving fascia, even when healed, can affect the relative mobility of fascia layers away from the injured area, especially when movement is also restricted. PMID:26820883

  4. Ultrasound Evaluation of the Combined Effects of Thoracolumbar Fascia Injury and Movement Restriction in a Porcine Model.

    Science.gov (United States)

    Bishop, James H; Fox, James R; Maple, Rhonda; Loretan, Caitlin; Badger, Gary J; Henry, Sharon M; Vizzard, Margaret A; Langevin, Helene M

    2016-01-01

    The persistence of back pain following acute back "sprains" is a serious public health problem with poorly understood pathophysiology. The recent finding that human subjects with chronic low back pain (LBP) have increased thickness and decreased mobility of the thoracolumbar fascia measured with ultrasound suggest that the fasciae of the back may be involved in LBP pathophysiology. This study used a porcine model to test the hypothesis that similar ultrasound findings can be produced experimentally in a porcine model by combining a local injury of fascia with movement restriction using a "hobble" device linking one foot to a chest harness for 8 weeks. Ultrasound measurements of thoracolumbar fascia thickness and shear plane mobility (shear strain) during passive hip flexion were made at the 8 week time point on the non-intervention side (injury and/or hobble). Injury alone caused both an increase in fascia thickness (p = .007) and a decrease in fascia shear strain on the non-injured side (p = .027). Movement restriction alone did not change fascia thickness but did decrease shear strain on the non-hobble side (p = .024). The combination of injury plus movement restriction had additive effects on reducing fascia mobility with a 52% reduction in shear strain compared with controls and a 28% reduction compared to movement restriction alone. These results suggest that a back injury involving fascia, even when healed, can affect the relative mobility of fascia layers away from the injured area, especially when movement is also restricted.

  5. Finite Element Limit Pressures for Circumferential Through-Wall Cracks in the Interface between Elbow and Pipe

    International Nuclear Information System (INIS)

    Among integrity assessment method based on a fracture mechanics concept for piping system, a limit load method is one of the important way to predict a maximum load carrying capacity in the materials with high ductility in the sense that it is used to either assess directly structural integrity of pipe based on fully plastic fracture mechanics or calculate elasticplastic fracture mechanics parameters based on reference stress concept. In nuclear power plants, piping system often involves elbows welded to straight pipe. Since welded regions are vulnerable to cracking, it is important to predict an accurate limit load for pipes with a crack in the interface between elbows and attached pipes. However, although extensive works have been made for developing limit analysis methods for cracked pipes, they were mainly for straight pipes. Recently, limit moment solutions for elbow that is attached to straight pipe with a circumferential through-wall crack(TWC) in the interface were proposed, whereas limit pressure for this geometry is not suggested yet. In this context, plastic limit pressures of circumferential TWCs between elbow and straight pipe were calculated in the present study considering geometric parameters such as an elbow curvature, a pipe size and a crack length. In the present study, the FE plastic limit analyses for circumferential TWC in the interface between elbow and pipe under internal pressure were conducted based on elastic perfectly plastic assumption. Based on the present FE results, it is found that plastic limit pressures of straight pipes with circumferential TWC are not appropriate for predicting plastic limit pressures of circumferential TWC in the interface between elbow and pipe for shorter crack length

  6. Influence of circumferential flaw length on internal burst pressure of a wall-thinned pipe

    International Nuclear Information System (INIS)

    Highlights: ► The effect of θ on pf was examined by experimental analysis and FEA. ► Here θ is the circumferential angle of a flaw, pf is the internal burst pressure. ► pf decreased as θ increased in some cases. ► The effect of θ on pf should be taken into consideration in evaluating pf. -- Abstract: This paper examines the effect of the circumferential angle of a flaw θ on the internal burst pressure pf of pipes with artificial wall-thinned flaws. The effect of θ has conventionally been regarded as unimportant in the evaluation of the pf of wall-thinned straight pipes. Therefore, a burst pressure equation for an axial crack inside a cylinder (Fig. 1, left), such as Kiefner's equation (Kiefner et al., 1973), has been widely applied (ANSI/ASME B31.G., 1991; Hasegawa et al., 2011). However, the following implicit assumptions notably exist when applying the equation to planar flaws in situations with non-planar flaws. 1)The fracture mode of the non-planar flaw under consideration is identical to that of the crack. 2)The effect of θ on pf, which is not considered for an axial crack, is small or negligible. However, the experimental results from the systematic burst tests for carbon steel pipes with artificial wall-thinned flaws examined in this paper showed that these implicit assumptions may be incorrect. In this paper the experimental results are evaluated in further detail. The purpose of the evaluation was to clarify the effect of θ on pf. Specifically, the significance of the flaw configuration (axial length δz and wall-thinning ratio t1/t) was studied for its effects on θ and pf. In addition, a simulation of this effect was conducted using a large strain elastic-plastic Finite Element Analysis (FEA) model. As observed from the experimental results, θ tended to affect pf in cases with large δz, and t1/t was also correlated with a decrease in pf with an increase in θ. These tendencies were successfully simulated by the large strain elastic

  7. Simultaneously Combined Anterior-Posterior Approaches for Subaxial Cervical Circumferential Reconstruction in a Sitting Position.

    Science.gov (United States)

    Han, Yue; Xia, Qun; Hu, Yong-cheng; Zhang, Ji-dong; Lan, Jie; Ma, Xin-long

    2015-11-01

    The purpose of this article is to introduce and analyze the feasibility of simultaneously combined anterior-posterior approaches for subaxial cervical circumferential reconstruction in sitting position. A retrospective case review was performed for above surgery procedure. A 79-year-old man was confirmed subaxial cervical fracture and dislocation with facet locked by radiological examination, and the involved levels were C5-6. According to American Spinal Injury Association (ASIA) classification, the impairment scale was grade B. And the Subaxial Cervical Spine Injury and Severity Score (SLIC) were 9. The patient was restricted in sitting position with traction on a halo in extension to immobilize the head during the operation. A posterior laminectomy and pedicle screws insertion to the involved cervical spine was performed firstly. And then the anterior discectomy and strut graft were accomplished through an anterior cervical approach. The final fixation was finished by clamping the strut graft with pedicle screw system. Total blood loss was 600 ml and the total operating time was 150 min. The patient was followed up for 6 months. The symptom of neck pain improved distinctly and no evidence about implant failure was noted. Neurological status improvement was confirmed and the ASIA scale was improved to grade C. We believed that the simultaneously combined anterior-posterior approach in sitting position was safe and more advantageous for appropriate cases. PMID:26790982

  8. Leak before break behaviour of austenitic and ferritic pipes containing circumferential defects

    Energy Technology Data Exchange (ETDEWEB)

    Stadtmueller, W.; Sturm, D.

    1997-04-01

    Several research projects carried out at MPA Stuttgart to investigate the Leak-before-Break (LBB) behavior of safety relevant pressure bearing components are summarized. Results presented relate to pipes containing circumferential defects subjected to internal pressure and external bending loading. An overview of the experimentally determined results for ferritic components is presented. For components containing postulated or actual defects, the dependence of the critical loading limit on the defect size is shown in the form of LBB curves. These are determined experimentally and/or by calculation for through-wall slits, and represent the boundary curve between leakage and massive fracture. For surface defects and a given bending moment and internal pressure, no fracture will occur if the length at leakage remains smaller than the critical defect length given by the LBB curve for through-wall defects. The predictive capability of engineering calculational methods are presented by way of example. The investigation programs currently underway, testing techniques, and initial results are outlined.

  9. Fracture behavior evaluations for ferritic steel piping with circumferential double flaws on the inner surface

    International Nuclear Information System (INIS)

    Methods for assessing the structural integrity of nuclear components having some flaws are provided in the Rules on Fitness-for-Service for Nuclear Power Plants of the JSME code (JSME FFS code). Although the JSME FFS code provides such methods for piping with a single flaw, it does not describe any method for fracture assessment of piping with multiple flaws including flaw coalescence criteria. Some investigations on the fracture behavior of mainly austenitic stainless steel piping with multiple flaws, whose fracture mode is plastic collapse, have recently been reported and fracture assessment methods have been proposed. In the present study, fracture tests and analyses of carbon steel piping with a single and two circumferential flaw(s) on the inner surface were conducted to investigate a method for fracture assessment of ferritic steel piping with multiple flaws. It was found that fracture assessment based on the twice elastic slope method and the plastic collapse mechanism gave inadequate results for a large single flaw. Including this case, two kinds of elastic–plastic fracture assessment method, one using the Z-factor in the JSME FFS code and the other by ductile instability analysis, gave conservative estimates of fracture strength even when the structural factor SF was not considered (i.e. SF = 1)

  10. The Prognostic Value of Circumferential Resection Margin Involvement in Patients with Extraperitoneal Rectal Cancer.

    Science.gov (United States)

    Shin, Dong Woo; Shin, Jin Yong; Oh, Sung Jin; Park, Jong Kwon; Yu, Hyeon; Ahn, Min Sung; Bae, Ki Beom; Hong, Kwan Hee; Ji, Yong Il

    2016-04-01

    The prognostic influence of circumferential resection margin (CRM) status in extraperitoneal rectal cancer probably differs from that of intraperitoneal rectal cancer because of its different anatomical and biological behaviors. However, previous reports have not provided the data focused on extraperitoneal rectal cancer. Therefore, the aim of this study was to examine the prognostic significance of the CRM status in patients with extraperitoneal rectal cancer. From January 2005 to December 2008, 248 patients were treated for extraperitoneal rectal cancer and enrolled in a prospectively collected database. Extraperitoneal rectal cancer was defined based on tumors located below the anterior peritoneal reflection, as determined intraoperatively by a surgeon. Cox model was used for multivariate analysis to examine risk factors of recurrence and mortality in the 248 patients, and multivariate logistic regression analysis was performed to identify predictors of recurrence and mortality in 135 patients with T3 rectal cancer. CRM involvement for extraperitoneal rectal cancer was present in 29 (11.7%) of the 248 patients, and was the identified predictor of local recurrence, overall recurrence, and death by multivariate Cox analysis. In the 135 patients with T3 cancer, CRM involvement was found to be associated with higher probability of local recurrence and mortality. In extraperitoneal rectal cancer, CRM involvement is an independent risk factor of recurrence and survival. Based on the results of the present study, it seems that CRM involvement in extraperitoneal rectal cancer is considered an indicator for (neo)adjuvant therapy rather than conventional TN status. PMID:27097629

  11. Tensile and Fracture Properties of Circumferentially Notched Tensile Specimens of Stainless Steel Weldments

    International Nuclear Information System (INIS)

    The tensile and fracture properties of different types of austenitic stainless steel weldments were determined using round notched tensile specimens. These included 304L, 316L and 6%Mo super austenitic stainless steels and their weld metals. The triaxial state of stress, the plastic constraint and the plane strain conditions developed ahead of the notch root make notched specimens eligible for the evaluation of fracture toughness. This was achieved through the testing procedure: J-evaluation on tensile test (JETT) using circumferentially notched round bar specimens. The JETT index was taken as a measure of the relevant elastic-plastic fracture toughness of the tested materials. In the case of austenitic stainless steels being too ductile at room temperature the resulted JETT were of relatively higher values than the fracture toughness values determined from the standard fracture mechanics test methods. This could be related to the difference in the stress state ahead of the sharp crack of the standard fracture mechanics specimen and that of the blunt notch of the tensile specimen. The results showed that the 6% Mo weld metal ranked highest while the 316L weld metal ranked lowest regarding JETT fracture toughness values. The deformation mechanisms pertinent to austenitic stainless steels (generation of stacking faults and formation of strain induced martensite) were employed for the interpretation of the experimental results.

  12. The stability of through-wall circumferential cracks in cylindrical pipes subjected to bending loads

    International Nuclear Information System (INIS)

    Tada, Paris and Gamble have used the tearing modulus approach to show that when a circumferential through-wall crack exists in a 304 SS circular cylindrical pipe, and the pipe is subjected to an applied bending moment, then crack growth requires the rotation at the pipe-ends to be increased, (i.e. crack growth is stable), unless the pipe length is unduly large. On this basis it was concluded that unstable fracture is unlikely to occur in BWR SS piping, when the system is designed in accord with the ASME Code load levels for normal operation and anticipated transients. The Tada-Paris-Gamble analysis focuses on the inter-relation between instability and the onset of crack extension, and does not specifically consider the possibility that a crack might become unstable after some stable crack extension. The paper addresses this aspect of the crack stability problem using a crack tip opening angle criterion for crack extension, which has similarities with the tearing modulus approach. The results show that unstable fracture should not occur even after some stable crack extension, again provided that the pipe length is not unduly large. In other words, guillotine failure of a pipe in a BWR system is unlikely, even though the ASME Code limiting stress levels as might be exceeded, as may be the case with a very severe earthquake. (orig./HP)

  13. Feasibility of radial and circumferential strain analysis using 2D speckle tracking echocardiography in cats.

    Science.gov (United States)

    Takano, Hiroshi; Isogai, Tomomi; Aoki, Takuma; Wakao, Yoshito; Fujii, Yoko

    2015-02-01

    The purpose of the present study is to investigate the feasibility of strain analysis using speckle tracking echocardiography (STE) in cats and to evaluate STE variables in cats with hypertrophic cardiomyopathy (HCM). Sixteen clinically healthy cats and 17 cats with HCM were used. Radial and circumferential strain and strain rate variables in healthy cats were measured using STE to assess the feasibility. Comparisons of global strain and strain variables between healthy cats and cats with HCM were performed. Segmental assessments of left ventricle (LV) wall for strain and strain rate variables in cats with HCM were also performed. As a result, technically adequate images were obtained in 97.6% of the segments for STE analysis. Sedation using buprenorphine and acepromazine did not affect any global strain nor strain rate variable. In LV segments of cats with HCM, reduced segmental radial strain and strain rate variables had significantly related with segmental LV hypertrophy. It is concluded that STE analysis using short axis images of LV appeared to be clinically feasible in cats, having the possibility to be useful for detecting myocardial dysfunctions in cats with diseased heart. PMID:25373881

  14. SERI Surgical Scaffold as an Adjunct for Circumferential Abdominoplasty and Lower Body Lift

    Directory of Open Access Journals (Sweden)

    Andrew Kornstein, MD, FACS

    2014-11-01

    Full Text Available Summary: Patients who have undergone massive weight loss typically have poor-quality skin and fascia and thus are prone to experiencing recurrent skin laxity, bulges, and poor scarring after body contouring efforts, even in the hands of experienced surgeons. Moreover, this challenging patient population often has nutritional deficiencies and concomitant medical problems, which may lead to delayed or suboptimal wound healing. A silk-derived biological scaffold (SBS and its facilitation of autogenous tissue generation may be viewed as a qualitative reinforcement of the superficial fascial system. Therefore, it may help support and stabilize a superficial fascial system that has been weakened by obesity and other factors. When employed in body lifting for patients with massive weight loss who desire long-lasting aesthetic results, it may represent a paradigm shift that has the potential to solve at least some issues that plague this patient population. In the present case of circumferential abdominoplasty and lower body lift, this silk-based bioresorbable scaffold was implanted in one side of the patient’s body but not the other. Throughout the 7-month follow-up period, the patient and her husband (who were blinded as to which side received the SBS and the author consistently observed more favorable results for the SBS side, which included greater postoperative comfort, better shape, higher buttock position, less recurrent laxity, and less descent of the scar.

  15. The Prognostic Value of Circumferential Resection Margin Involvement in Patients with Extraperitoneal Rectal Cancer.

    Science.gov (United States)

    Shin, Dong Woo; Shin, Jin Yong; Oh, Sung Jin; Park, Jong Kwon; Yu, Hyeon; Ahn, Min Sung; Bae, Ki Beom; Hong, Kwan Hee; Ji, Yong Il

    2016-04-01

    The prognostic influence of circumferential resection margin (CRM) status in extraperitoneal rectal cancer probably differs from that of intraperitoneal rectal cancer because of its different anatomical and biological behaviors. However, previous reports have not provided the data focused on extraperitoneal rectal cancer. Therefore, the aim of this study was to examine the prognostic significance of the CRM status in patients with extraperitoneal rectal cancer. From January 2005 to December 2008, 248 patients were treated for extraperitoneal rectal cancer and enrolled in a prospectively collected database. Extraperitoneal rectal cancer was defined based on tumors located below the anterior peritoneal reflection, as determined intraoperatively by a surgeon. Cox model was used for multivariate analysis to examine risk factors of recurrence and mortality in the 248 patients, and multivariate logistic regression analysis was performed to identify predictors of recurrence and mortality in 135 patients with T3 rectal cancer. CRM involvement for extraperitoneal rectal cancer was present in 29 (11.7%) of the 248 patients, and was the identified predictor of local recurrence, overall recurrence, and death by multivariate Cox analysis. In the 135 patients with T3 cancer, CRM involvement was found to be associated with higher probability of local recurrence and mortality. In extraperitoneal rectal cancer, CRM involvement is an independent risk factor of recurrence and survival. Based on the results of the present study, it seems that CRM involvement in extraperitoneal rectal cancer is considered an indicator for (neo)adjuvant therapy rather than conventional TN status.

  16. Interactions of a propeller with a stator-induced circumferentially varying flow

    Energy Technology Data Exchange (ETDEWEB)

    Farnsworth, John [Rensselaer Polytechnic Institute, Mechanical Aerospace and Nuclear Engineering, Troy, NY (United States); US Air Force Academy, Department of Aeronautics, Colorado Springs, CO (United States); Amitay, Michael [Rensselaer Polytechnic Institute, Mechanical Aerospace and Nuclear Engineering, Troy, NY (United States); Rensselaer Polytechnic Institute, Center for Flow Physics and Control (CeFPaC), Troy, NY (United States); Beal, David; Huyer, Stephen A. [Naval Undersea Warfare Center, Division, Vehicle Dynamics and Signature Control, Newport, RI (United States)

    2012-02-15

    The interactions of a circumferentially varying stator cascade and a downstream fixed pitch propeller were investigated experimentally. The global performance of the components and the coupled system were systematically investigated through force and moment measurements on the propulsor model in a water tunnel. In addition, the wake of the cyclic stator cascade with and without the propeller was investigated downstream from a propulsor model using the Stereoscopic PIV technique. A cyclic distribution of the stators' deflections resulted in non-axisymmetric distributions of the flow field downstream of the stator array. The stator distribution alone produced a significant side force that increased linearly with stator pitch amplitude. When a propeller was incorporated downstream from the cyclic cascade, the side force from the stator cascade was reduced, but a small normal force and pitching moment were created. The generation of these secondary forces and moments can be related to the redistribution of the tangential flow from the cyclic cascade into the axial direction by the retreating and advancing blade states of the fixed pitch propeller. (orig.)

  17. Factors as predictors for thoracic and thoracolumbar/lumbar structural curves in adolescent idiopathic scoliosis

    Institute of Scientific and Technical Information of China (English)

    CHEN Zi-qiang; ZHAO Yong-fei; HE Shi-sheng; WANG Chuan-feng; ZHANG Jing-tao; ZHAO Ying-chuan; YANG Chang-wei; LI Ming

    2012-01-01

    Background Recent studies have demonstrated that the Lenke system is relatively efficient and consistent in classifying scoliosis curves.Basically,fusion should include the main curve and the structural minor curve.The criteria for defining the structural minor curve were established to help guide these decision-making process.The present study was designed to investigate predictors of the structural curve,and see whether it was possible to prevent the formation of the structural curve by interfering with influencing factors to decrease the fusion level.Methods Age,gender,Cobb angle,Perdriolle rotation,Risser sign and the number of vertebrae included in the curve,brace treatment,and curve location were recorded in 145 idiopathic scoliosis patients from July 2001 to January 2007.The patients were divided into two groups:structural and non-structural groups.Demographics and baseline characteristics were compared between the two groups as an initial screen.Logistic regression was used to analyze factors affecting the minor curve to become the structural curve.Results Compared with the non-structural group,the structural group had a higher Cobb angle ((51.34±13.61)° vs.(34.20±7.21)°,P <0.001),bending angle ((33.94±9.92)° vs.(8.46±5.56)°,P <0.001) and curve rotation ((23.25±12.86)° vs.(14.21±8.55) °,P <0.001),and lower flexibility ((33.48±12.53)% vs.(75.50±15.52)%,P <0.001).There was no significant difference in other parameters between the two groups.The results of the Logistic regression analysis showed that the Cobb angle (OR:9.921,P <0.001) and curve location (OR.4.119,P=0.016) were significant predictors of structural curve in adolescent idiopathic scoliosis.Every 10° change of Cobb angle increased the possibility of turning the minor curve into the structural curve by 10-fold.And thoracic curve showed,on the average,the possibility of becoming the structural curve about 4-fold more often than did the thoracolumbar/lumbar curve

  18. Subcutaneous fluid collection: An imaging marker for treatment response of infectious thoracolumbar spondylodiscitis

    Energy Technology Data Exchange (ETDEWEB)

    Kakigi, Takahide, E-mail: tkakigi@kuhp.kyoto-u.ac.jp [Department of Diagnostic Imaging and Nuclear Medicine, Kyoto University Graduate School of Medicine, 54 Shogoin Kawahara-cho, Sakyo-ku, Kyoto 606-8507 (Japan); Okada, Tomohisa, E-mail: tomokada@kuhp.kyoto-u.ac.jp [Department of Diagnostic Imaging and Nuclear Medicine, Kyoto University Graduate School of Medicine, 54 Shogoin Kawahara-cho, Sakyo-ku, Kyoto 606-8507 (Japan); Sakai, Osamu, E-mail: osamu.sakai@bmc.org [Department of Radiology, Boston Medical Center, Boston University School of Medicine, FGH Building, 3rd Floor, 820 Harrison Avenue, Boston, MA 02118 (United States); Iwamoto, Yoshitaka, E-mail: iwacame@hotmail.co.jp [Department of General Internal Medicine, Rakuwakai Otowa Hospital, 2 Otowachoinji-cho, Yamashina-ku, Kyoto 607-8062 (Japan); Kubo, Soichi, E-mail: kubo-s@mbox.kyoto-inet.or.jp [Department of Radiology, Rakuwakai Otowa Hospital, 2 Otowachoinji-cho, Yamashina-ku, Kyoto 607-8062 (Japan); Yamamoto, Akira, E-mail: yakira@kuhp.kyoto-u.ac.jp [Department of Diagnostic Imaging and Nuclear Medicine, Kyoto University Graduate School of Medicine, 54 Shogoin Kawahara-cho, Sakyo-ku, Kyoto 606-8507 (Japan); Togashi, Kaori, E-mail: nmdioffice@kuhp.kyoto-ac.jp [Department of Diagnostic Imaging and Nuclear Medicine, Kyoto University Graduate School of Medicine, 54 Shogoin Kawahara-cho, Sakyo-ku, Kyoto 606-8507 (Japan)

    2015-07-15

    Highlights: • No imaging marker for treatment response of spondylodiscitis (SD) has been proposed. • Volume changes of subcutaneous fluid collection (SFC) had significant correlation with changes of C-reactive protein (CRP). • SFC can be used as an imaging marker for treatment response of SD on magnetic resonance imaging (MRI). - Abstract: Purpose: To evaluate prevalence of subcutaneous fluid collection (SFC) in infectious thoracolumbar spondylodiscitis (SD) compared with control patients and to investigate correlation between volume changes of SFC and treatment response of SD. Materials and methods: This retrospective study was approved by our institutional review board. From April 2011 to March 2012, 49 patients (24 SD and 25 non-SD patients) were enrolled. Prevalence of SFC was evaluated respectively for SD and non-SD patients using magnetic resonance imaging (MRI) on the sagittal short tau inversion recovery (STIR) imaging or fat-saturated T2-weighted imaging (T2WI), and compared. In SD patients with SFC, correlation was investigated between SFC volume on the 1st MRI and initial clinical status. The same analysis was conducted also for SFC volume changes from the 1st to 2nd or last MRI. Results: SFC was found in 20 patients with SD (83.3%) and 3 non-SD patients (12%) with significant difference (p < .001). In 20 SD patients with SFC, 17 patients had follow-up MRI. For the 1st MRI, no significant correlation was found between volume of SFC and initial status of patients, including body weight, body mass index (BMI), white blood cell (WBC), and erythrocyte sedimentation rate (ESR). However, significant positive correlations were found between changes of C-reactive protein (CRP) and SFC volume from the 1st to 2nd as well as from the 1st to the last MRI (each p < .05). Conclusion: SD patients had significantly higher prevalence of SFC than non-SD patients. Volume changes of SFC had significant correlation with changes of CRP, which can be used as an imaging

  19. Detailed analysis of the clinical effects of cell therapy for thoracolumbar spinal cord injury: an original study

    Directory of Open Access Journals (Sweden)

    Sharma A

    2013-07-01

    Full Text Available Alok Sharma,1 Nandini Gokulchandran,1 Hemangi Sane,2 Prerna Badhe,1 Pooja Kulkarni,2 Mamta Lohia,3 Anjana Nagrajan,3 Nancy Thomas3 1Department of Medical Services and Clinical Research, 2Department of Research and Development, 3Department of Neurorehabilitation, NeuroGen Brain and Spine Institute, Surana Sethia Hospital and Research Centre, Chembur, Mumbai, India Background: Cell therapy is amongst the most promising treatment strategies in spinal cord injury (SCI because it focuses on repair. There are many published animal studies and a few human trials showing remarkable results with various cell types. The level of SCI determines whether paraplegia or quadriplegia is present, and greatly influences recovery. The purpose of this study was to determine the significance of the clinical effects and long-term safety of intrathecal administration of autologous bone marrow-derived mononuclear cells, along with changes in functional independence and quality of life in patients with thoracolumbar SCI. Methods: We undertook a retrospective analysis of a clinical study in which a nonrandomized sample of 110 patients with thoracolumbar SCI underwent autologous bone marrow-derived mononuclear cell transplantation intrathecally and subsequent neurorehabilitation, with a mean follow-up of 2 years ± 1 month. Changes on any parameters were recorded at follow-up. The data were analyzed using the Wilcoxon's signed-rank test and McNemar's test. Functional Independence Measure and American Spinal Injury Association (ASIA scores were recorded, and a detailed neurological assessment was performed. Results: Overall improvement was seen in 91% of patients, including reduction in spasticity, partial sensory recovery, and improvement in trunk control, postural hypotension, bladder management, mobility, activities of daily living, and functional independence. A significant association of these symptomatic improvements with the cell therapy intervention was established

  20. Depression of the Thoracolumbar Posterior Vertebral Body on the Estimation of Cement Leakage in Vertebroplasty and Kyphoplasty Operations

    Science.gov (United States)

    Chen, Hao; Jia, Pu; Bao, Li; Feng, Fei; Yang, He; Li, Jin-Jun; Tang, Hai

    2015-01-01

    Background: The cross-section of thoracolumbar vertebral body is kidney-shaped with depressed posterior boundary. The anterior wall of the vertebral canal is separated from the posterior wall of the vertebral body on the lateral X-ray image. This study was designed to determine the sagittal distance between the anterior border of the vertebral canal and the posterior border of the vertebral body (DBCV) and to analyze the potential role of DBCV in the estimation of cement leakage during percutaneous vertebroplasty (PVP) or percutaneous kyphoplasty (PKP). Methods: We retrospectively recruited 233 patients who had osteoporotic vertebral compression fractures and were treated with PVP or PKP. Computed tomography images of T11–L2 normal vertebrae were measured to obtain DBCV. The distance from cement to the posterior wall of the vertebral body (DCPW) of thoracolumbar vertebrae was measured from C-arm images. The selected vertebrae were divided into two groups according to DCPW, with the fracture levels, fracture grades and leakage rates of the two groups compared. A relative operating characteristic (ROC) curve was applied to determine whether the DCPW difference can be used to estimate the degree of cement leakage. The data were processed by statistical software SPSS version 21.0 using independent sample t-test and Chi-square tests. Results: The maximum DBCV was 6.40 mm and the average DBCV was 3.74 ± 0.95 mm. DBCV appeared to be longer in males than in females, but the difference was not statistically significant. The average DCPW of type-B leakage vertebrae (2.59 ± 1.20 mm) was shorter than that of other vertebrae (7.83 ± 2.38 mm, P 6.40 mm for type-C and type-S, but much higher for type-B. ROC curve revealed that DCPW only has a predictive value for type-B leakage (area under the curve: 0.98, 95% confidence interval: 0.95–0.99, P < 0.001), and when the cut-off value was 4.05 mm, the diagnostic sensitivity and the specificity were 94.87% and 93

  1. Pedicle screw system through paraspinal approach combined preoperative manual and postural reduction for thoracolumbar fractures%椎旁肌间隙入路结合术前手法复位治疗胸腰椎骨折

    Institute of Scientific and Technical Information of China (English)

    王延国; 鲁秀国; 周忠水; 翟贵亮; 郑燕平

    2013-01-01

    Objective To compare the clinical results between paraspinal approach combined preoperative manual and postural reduction and conventional posterior midline approach for thoracolumbar fracture.Methods From June 2005 to December 2011,70 patients with thoracolumbar vertebral compression or burst fractures without neural syndromes underwent reposition and internal fixation by the screw-rod system.The patients were divided into 2 groups randomly:Group A through paraspinal approach,and Group B conventional posterior midline approach.The data between 2 groups were compared,such as operation time,blood loss and visual analog scale (VAS) scores.Results Allpatients were followed up for 18 months.The differences of postoperative correction rate of Cobb' s angle and accuracy of pedicle screw placement between 2 groups were not statistically significant (P > 0.05).The operation time,blood loss and postoperative volume of drainage of Group A were less than those of the Group B(P <0.05).The postoperative VAS score of Group A were lower than those of the Group B(P <0.05).Conclusion Pedicle screw system through paraspinal approach combined preoperative manual and postural reduction is a better way than the posterior midiine approach for thoracolumbar fractures that has no need of decompression,less trauma,less injury of paraspinal muscle and more relief of postoperative low back pain.%目的 对比观察应用后路经椎旁肌间隙入路椎弓根螺钉内固定结合手法复位治疗胸腰椎骨折的疗效.方法 2005年6月~2011年12月共收治单纯性压缩性胸腰椎骨折患者70例.随机采用椎旁肌间隙入路手术36例,传统骶棘肌剥离入路手术34例.比较2种术式的手术时间、术中出血量、术后引流量、后凸Cobb角矫正率、椎体塌陷矫正率、疼痛视觉模拟量表(visual analogue scale,VAS)评分等.结果 2组手术在手术时间、术中出血量、术后引流量方面差异有统计学意义(P<0.05),拆除内固

  2. Mismatch Limit Load Analyses for V-groove Welded Pipe with Through-wall Circumferential Defect in Centre of Weld

    International Nuclear Information System (INIS)

    The present work reports the mismatch limit loads for a V-groove welded pipe for a circumferential crack using finite element (FE) analyses. To integrate the effect of groove angles on mismatch limit loads, one geometry related slenderness parameter was modified by relevant geometric parameters including the groove angle, crack depth, and root opening based on plastic deformation patterns in the theory of plasticity. Circumferential through-wall cracks are located at the centre of the weldments with two different groove angles (45 .deg., 90 .deg.). With regard to the loading conditions, axial (longitudinal) tension and bending are applied for all cases. For the parent and weld metal, elastic-perfectly plastic materials are considered to simulate and analyze under- and over-matching conditions in plasticity. The overall results from the proposed solutions are found to be similar to the FE results

  3. Circumferential 2D-strain imaging for the prediction of long term response to cardiac resynchronization therapy

    Directory of Open Access Journals (Sweden)

    Baumann Gert

    2008-06-01

    Full Text Available Abstract Background Cardiac Resynchronization Therapy (CRT leads to hemodynamic and clinical improvement in heart failure patients. The established methods to evaluate myocardial asynchrony analyze longitudinal and radial myocardial function. This study evaluates the new method of circumferential 2D-strain imaging in the prediction of the long-term response to CRT. Methods and results 38 heart failure patients (NYHA II-III, QRS > 120 ms, LVEF Conclusion There is a significant decrease in the circumferential 2D-strain derived delays after CRT, indicating that resynchronization induces improvement in all three dimensions of myocardial contraction. However, the resulting predictive values of 2D strain delays are not superior to longitudinal and radial 2D-strain or TDI delays.

  4. 胸腰椎骨折治疗的研究进展(综述)%Research progress of the treatment of thoracolumbar fracture

    Institute of Scientific and Technical Information of China (English)

    李圣

    2015-01-01

    胸腰椎骨折是指发生于胸11至腰1之间的脊柱骨折,由于其为胸腰椎移行区,为生物应力的集中点,所以易于发生损伤,而胸腰椎骨折的治疗目标是让患者存活,避免更进一步的神经损害,通过重建脊柱序列获得脊柱的稳定性并通过早期的活动及康复,从而使患者尽快恢复正常工作.胸腰椎骨折因其固有的解剖特点,在诊断、治疗等方面有其特殊性,且因其发生率较高,为临床工作经常遇到的疾病,为了更好的指导临床工作,现就胸腰椎骨折治疗的研究进展做一综述.%The thoracolumbar fracture are the spine fractures occurring at the T11 to the L1 level.Because it's the transition region of thoracolumbar spine and the focus of the biological stress,it is easy to damage.The goal of treatment of the thoracolumbar fracture is keeping patients alive,protecting from the further neural damage,obtaining the stability by constructing anatomical alignment of spinal columns and returning patients to workplace through early mobilization and rehabilitation.Because of its inherent anatomical features,the diagnosis and the treatment of thoracolumbar fracture are special,and there is a high morbidity of thoracolumbar fracture,which we are frequently encountering in the clinical work.To guide the clinical work better,we will take a review about the research progress of the treatment of thoracolumbar fracture.

  5. Comparison of treatment for 153 cases of circumferential facial paralysis by low-power laser and galvan acupuncture

    Science.gov (United States)

    Li, Hai-Ling; Zhuo, Qing-shan

    1993-03-01

    Seventy-six patients were treated by low power He-Ne laser irradiation on Yangbai, Sibai, and other related acupoints. The other 77 cases were treated by Galvan-acupuncture with infrared radiation on the same acupoints. There was little difference between the therapeutic effects of these two groups (P > 0.05). However, the laser group had a much shorter treatment time than the other group. According to the theory of traditional Chinese medicine, circumferential facial paralysis is caused by exposure to cold which blocks the channel of vital energy resulting in the damage of bodily function. Acupuncture and moxibustion on certain acupoints can warm up the channels and remove the stasis allowing vital energy to pass through their passages to regulate bodily functions. Laser can do the same effectively with much less time. The laser therapy also features painlessness, safeness, and is free of bacteria. Circumferential facial paralysis is a common disease, which is clinically treated by acupuncture with reliable results. However, acupuncture is not fit for children who are not cooperative and those patients who are afraid of the pain accompanied with acupuncture. So we applied low power laser irradiation in the treatment of circumferential facial paralysis starting in 1985. The results were favorable. And the treatment time was shortened. The treatment procedures are reported.

  6. Early-phase changes of P-wave characteristics after circumferential pulmonary vein isolation

    Institute of Scientific and Technical Information of China (English)

    ZHAO Liang; JIANG Wei-feng; ZHOU Li; LIU Xu

    2013-01-01

    Background Circumferential pulmonary vein isolation (CPVI),as the basal ablation strategy for treating atrial fibrillation (AF),not only isolates the connection between the left atrium (LA) and the pulmonary veins (PVs),but also induces extensive atrial endocardia damage.This could have an effect on the sinus pulse conduction in the LA and subsequently result in changes of P-wave characteristics of surface electrocardiogram (ECG).Methods Fifty consecutive patients underwent CPVI for symptomatic drug-refractory paroxysmal AF.The 12-lead ECGs were recorded one day before CPVI and seven days after CPVI at sinus rhythm by a standard resting ECG device.Measured characteristics of the P-wave consisted of P-wave duration (PWD),P-wave amplitude (PWA),P-wave polarity (PWP),P-wave notch,P-wave dispersion and P-wave index.Results After CPVI,a prevalent decrease of PWD,PWA,and P-wave dispersion was observed; a transition of P-wave polarity was observed in the leads of Ⅲ,aVL and aVF.The rate of P-wave notch decreased significantly in all leads,especially in the leads of Ⅱ,Ⅲ,aVF and V3.Patients with sinus rhythm had a shorter P-wave dispersion and P-wave index and had a lower rate of P-wave notch compared with the patients with recurrent atrial tachyarrhythmia.Conclusion Observations from using the surface ECG showed that CPVI has instant effects on the electrical conduction in the LA,and several changes of P-wave characteristics associated with development of AF are improved by CPVI.

  7. Different bone regeneration patterns in periimplant circumferential gap defects grafted with two types of osteoconductive biomaterial.

    Science.gov (United States)

    Lee, Jung-Seok; Sohn, Joo-Yeon; Lim, Hyun-Chang; Jung, Ui-Won; Choi, Seong-Ho

    2016-08-01

    This study aimed to determine healing patterns in periimplant gap defect grafted with demineralized bovine bone mineral (DBBM) and porous titanium granules (PTG), which are known to induce a minimal tissue reaction and to undergo minimal biodegradation in healing process. Experiments were performed using a standardized periimplant gap-defect model in dogs with two observational periods: 4 and 8 weeks. Circumferential defects were surgically induced around dental implants on unilateral mandibles in five dogs, and collagen barrier membranes were placed over the DBBM and PTG grafts at two experimental sites and over a nongrafted site. Four weeks later, the same procedures were performed on the contralateral mandible, and the animals allowed to heal for a further 4 weeks, after which they were sacrificed and their mandibles with graft/control sites harvested for histologic evaluation. Both types of grafted biomaterials significantly enhanced the defect fill with newly formed bone, but the bone-to-implant contact (BIC) was significantly increased only at sites that had been grafted with DBBM. The two experimental sites exhibited different healing patterns, with new bone formation being observed on the surface of the DBBM particles throughout the defect, while there was no de novo bone formation on the PTG surface, but rather appositional bone growth from the base and lateral walls of the defect. It has been suggested that gap-defect filling with DBBM around dental implants may enhance both BIC and defect fill; however, the present findings show that defect grafting with PTG enhances only defect fill and not BIC. © 2015 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 104B: 1202-1209, 2016. PMID:26087247

  8. Interrater reliability of identifying indicators of posterior ligamentous complex disruption when plain films are indeterminate in thoracolumbar injuries

    International Nuclear Information System (INIS)

    The Spine Trauma Study Group (STSG) has proposed a novel thoracolumbar injury classification system and score (TLICS) in an attempt to define traumatic spinal injuries and direct appropriate management schemes objectively. The TLICS assigns specific point values based on three variables to generate a final severity score that guides potential treatment options. Within this algorithm, significant emphasis has been placed on posterior ligamentous complex (PLC) integrity. The purpose of this study was to determine the interrater reliability of indicators surgeons use when assessing PLC disruption on imaging studies, including computed tomography (CT) and magnetic resonance imaging (MRI). Orthopedic surgeons and neurosurgeons retrospectively reviewed a series of thoracolumbar injury case studies. Thirteen case studies, including images, were distributed to STSG members for individual, independent evaluation of the following three criteria: diastasis of the facet joints on CT; posterior edema-like signal in the region of PLC components on sagittal T2-weighted fat saturation (FAT SAT) MRI; and disrupted PLC components on sagittal T1-weighted MRI. Interrater agreement on the presence or absence of each of the three criteria in each of the 13 cases was assessed. Absolute interrater percent agreement on diastasis of the facet joints on CT and posterior edema-like signal in the region of PLC components on sagittal T2-weighted FAT SAT MRI was similar (agreement 70.5%). Interrater agreement on disrupted PLC components on sagittal T1-weighted MRI was 48.9%. Facet joint diastasis on CT was the most reliable indicator of PLC disruption as assessed by both Cohen's kappa (κ=0.395) and intraclass correlation coefficient (ICC 0.430). The interrater reliability of assessing diastasis of the facet joints on CT had fair to moderate agreement. The reliability of assessing the posterior edema-like signal in the region of PLC components was lower but also fair, whereas the reliability of

  9. CLINICAL AND MAGNETIC RESONANCE IMAGING CHARACTERISTICS OF THORACOLUMBAR INTERVERTEBRAL DISK EXTRUSIONS AND PROTRUSIONS IN LARGE BREED DOGS.

    Science.gov (United States)

    Gomes, Sergio A; Volk, Holger A; Packer, Rowena Ma; Kenny, Patrick J; Beltran, Elsa; De Decker, Steven

    2016-07-01

    Treatment recommendations differ for dogs with intervertebral disk extrusion vs. intervertebral disk protrusion. The aim of this retrospective, cross-sectional study was to determine whether clinical and magnetic resonance imaging (MRI) variables could be used to predict a diagnosis of thoracolumbar intervertebral disk extrusion or protrusion in dogs. Dogs were included if they were large breed dogs, had an MRI study of the thoracolumbar or lumbar vertebral column, had undergone spinal surgery, and had the type of intervertebral disk herniation (intervertebral disk extrusion or protrusion) clearly stated in surgical reports. A veterinary neurologist unaware of surgical findings reviewed MRI studies and recorded number, location, degree of degeneration and morphology of intervertebral disks, presence of nuclear clefts, disk space narrowing, extent, localization and lateralization of herniated disk material, degree of spinal cord compression, intraparenchymal intensity changes, spondylosis deformans, spinal cord swelling, spinal cord atrophy, vertebral endplate changes, and presence of extradural hemorrhage. Ninety-five dogs were included in the sample. Multivariable statistical models indicated that longer duration of clinical signs (P = 0.01), midline instead of lateralized disk herniation (P = 0.007), and partial instead of complete disk degeneration (P = 0.01) were associated with a diagnosis of intervertebral disk protrusion. The presence of a single intervertebral herniation (P = 0.023) and dispersed intervertebral disk material not confined to the disk space (P = 0.06) made a diagnosis of intervertebral disk extrusion more likely. Findings from this study identified one clinical and four MRI variables that could potentially facilitate differentiating intervertebral disk extrusions from protrusions in dogs. PMID:27038182

  10. Corrective Jaw Surgery

    Science.gov (United States)

    ... out more. Corrective Jaw Surgery Corrective Jaw Surgery Orthognathic surgery is performed to correct the misalignment of ... out more. Corrective Jaw Surgery Corrective Jaw Surgery Orthognathic surgery is performed to correct the misalignment of ...

  11. Surgical treatment of post-traumatic kyphosis in the thoracolumbar spine: indications and technical aspects

    OpenAIRE

    Munting, Everard

    2009-01-01

    Indications for correction of post-traumatic kyphotic deformity of the spine and technical aspects of the surgical procedure are reviewed. Surgical correction of post-traumatic deformity of the spine should be considered in patients presenting a local excess of kyphosis in the fractured area superior to 20° with poor functional tolerance. Severe pain, explained by objective factors such as canal or neuroforamen compromise with or without peripheral symptoms, angular deformity, non-union, foca...

  12. Sagittal Balance Correction in Lateral Interbody Fusion for Degenerative Scoliosis

    Science.gov (United States)

    Gallizzi, Michael A.; Sheets, Charles; Smith, Benjamin T.; Isaacs, Robert E.; Eure, Megan; Brown, Christopher R.

    2016-01-01

    Background Sagittal balance restoration has been shown to be an important determinant of outcomes in corrective surgery for degenerative scoliosis. Lateral interbody fusion (LIF) is a less-invasive technique which permits the placement of a high lordosis interbody cage without risks associated with traditional anterior or transforaminal interbody techniques. Studies have shown improvement in lumbar lordosis following LIF, but only one other study has assessed sagittal balance in this population. The objective of this study is to evaluate the ability of LIF to restore sagittal balance in degenerative lumbar scoliosis. Methods Thirty-five patients who underwent LIF for degenerative thoracolumbar scoliosis from July 2013 to March 2014 by a single surgeon were included. Outcome measures included sagittal balance, lumbar lordosis, Cobb Angle, and segmental lordosis. Measures were evaluated pre-operative, immediately post-operatively, and at their last clinical follow-up. Repeated measures ANOVAs were used to assess the differences between pre-operative, first postoperative, and a follow-up visit. Results The average sagittal balance correction was not significantly different: 1.06cm from 5.79cm to 4.74cm forward. The average Cobb angle correction was 14.1 degrees from 21.6 to 5.5 degrees. The average change in global lumbar lordosis was found to be significantly different: 6.3 degrees from 28.9 to 35.2 degrees. Conclusions This study demonstrates that LIF reliably restores lordosis, but does not significantly improve sagittal balance. Despite this, patients had reliable improvement in pain and functionality suggesting that sagittal balance correction may not be as critical in scoliosis correction as previous studies have indicated. Clinical Relevance LIF does not significantly change sagittal balance; however, clinical improvement does not seem to be contingent upon sagittal balance correction in the degenerative scoliosis population. The DUHS IRB has determined this

  13. Sagittal Balance Correction in Lateral Interbody Fusion for Degenerative Scoliosis

    Science.gov (United States)

    Gallizzi, Michael A.; Sheets, Charles; Smith, Benjamin T.; Isaacs, Robert E.; Eure, Megan; Brown, Christopher R.

    2016-01-01

    Background Sagittal balance restoration has been shown to be an important determinant of outcomes in corrective surgery for degenerative scoliosis. Lateral interbody fusion (LIF) is a less-invasive technique which permits the placement of a high lordosis interbody cage without risks associated with traditional anterior or transforaminal interbody techniques. Studies have shown improvement in lumbar lordosis following LIF, but only one other study has assessed sagittal balance in this population. The objective of this study is to evaluate the ability of LIF to restore sagittal balance in degenerative lumbar scoliosis. Methods Thirty-five patients who underwent LIF for degenerative thoracolumbar scoliosis from July 2013 to March 2014 by a single surgeon were included. Outcome measures included sagittal balance, lumbar lordosis, Cobb Angle, and segmental lordosis. Measures were evaluated pre-operative, immediately post-operatively, and at their last clinical follow-up. Repeated measures ANOVAs were used to assess the differences between pre-operative, first postoperative, and a follow-up visit. Results The average sagittal balance correction was not significantly different: 1.06cm from 5.79cm to 4.74cm forward. The average Cobb angle correction was 14.1 degrees from 21.6 to 5.5 degrees. The average change in global lumbar lordosis was found to be significantly different: 6.3 degrees from 28.9 to 35.2 degrees. Conclusions This study demonstrates that LIF reliably restores lordosis, but does not significantly improve sagittal balance. Despite this, patients had reliable improvement in pain and functionality suggesting that sagittal balance correction may not be as critical in scoliosis correction as previous studies have indicated. Clinical Relevance LIF does not significantly change sagittal balance; however, clinical improvement does not seem to be contingent upon sagittal balance correction in the degenerative scoliosis population. The DUHS IRB has determined this

  14. Fracture Toughness (K1C) evaluation for dual phase medium carbon low alloy steels using circumferential notched tensile (CNT) specimens

    OpenAIRE

    Kenneth Kanayo Alaneme

    2011-01-01

    The fracture behavior of dual phase medium carbon low alloy steels produced using two different chemical compositions (A - 0.34C, 0.75Mn, 0.12Cr, 0.13Ni steel and B - 0.3C, 0.97Mn, 0.15Cr steel) was investigated using circumferential notched tensile (CNT) specimens. Intercritical treatments were performed on samples with composition A by 1) austenitizing at 860 °C for 1 hour cooling in air, then treating at 770 °C for 30 minutes before oil quenching; 2) austenitizing at 860 °C for 1 hour quen...

  15. K{sub I}-T estimation for embedded flaws in pipes - Part II: Circumferentially oriented cracks

    Energy Technology Data Exchange (ETDEWEB)

    Qian Xudong, E-mail: cveqx@nus.edu.s [Department of Civil Engineering, National University of Singapore, 1 Engineering Drive 2, Singapore 117576 (Singapore)

    2010-04-15

    This paper, in parallel to the investigation on axially embedded cracks reported in the companion paper, presents a numerical study on the linear-elastic K{sub I} and T-stress values over the front of elliptical cracks circumferentially embedded in the wall of a pipe/cylindrical structure, under a uniform pressure applied on the inner surface of the pipe. The numerical procedure employs the interaction-integral approach to compute the linear-elastic stress-intensity factor (SIF) K{sub I} and T-stress values for embedded cracks with practical sizes at different locations in the wall of the pipe. The parametric study covers a wide range of geometric parameters for embedded cracks in the pipe, including: the wall thickness to the inner radius ratio (t/R{sub i}), the crack depth over the wall thickness ratio (a/t), the crack aspect ratio (a/c) and the ratio of the distance from the centerline of the crack to the outer surface of the pipe over the pipe wall thickness (e{sub M}/t). The parametric investigation identifies a significant effect of the remaining ligament length on both the T-stress and K{sub I} values at the crack-front location (denoted by point O) nearest to the outer surface of the pipe and at the crack-front location (denoted by point I) nearest to the inner surface of the pipe. The numerical investigation establishes the database to derive approximate functions from a nonlinear curve-fitting procedure to predict the T-stress and K{sub I} values at three critical front locations of the circumferentially embedded crack in a pipe: points O, I and M. The proposed T-stress and K{sub I} functions utilize a combined second-order polynomial and a power-law expression, which presents a close agreement with the T-stress and K{sub I} values computed from the very detailed finite element models. The comparison between the circumferentially embedded crack and the axially embedded crack indicates that both the T-stress and K{sub I} values at crack-front points O and

  16. Contribution to the Evaluation of the Circumferentially-Cracked Round Bar for Fracture Toughness Determination of Reactor Pressure

    Energy Technology Data Exchange (ETDEWEB)

    Scibetta, M

    1999-06-01

    The subject of this PhD dissertation is the use of the Circumferentially-Cracked Round Bar (CRB) for fracture toughness measurements. The main advantages of CRB are the relatively small size requirements of the testing specimens, the low cost to machine the specimen, the rotating bending fatigue allowing for easy precracking of specimens, the use of standard tensile test fixture and the axisymmetry of the specimen that avoids time consuming 3D finite element calculations. An in-depth study of the most widely used precracking technique for CRB, namely the rotating bending fatigue, is made.

  17. Efficacy of posterior vertebral column resection for the treatment of chronic thoracolumbar tuberculosis with secondary paraplegia%后路脊柱切除重建术治疗胸腰椎陈旧性结核继发截瘫

    Institute of Scientific and Technical Information of China (English)

    李锐; 施永彦; 张功礼; 李锋

    2012-01-01

    Objective To observe the therapeutical effect of posterior vertebral column resection on chronic thoracolumbar tuberculosis with secondary paraplegia and to provide a safe and effective method for the treatment of chronic thoracolumbar tuberculosis with secondary paraplegia.Methods From Aug.2007 to Mar.2010,12 cases with chronic thoracolumbar tuberculosis and secondary paraplegia were surgically treated by posterior vertebral column resection and Titanium net support for bone graft and internal fixation operation treatment.Cobb angle was measured,and conditions of internal fixation were observed before and after the operation by X-ray films.Neurological status were evaluated by Frankel grades.Results The follow-up periods was 6- 18 months( on average 11 months).Operations eased all patients' back and chest pain.Frankel grade increased from C preoperatively to grade D or E postoperatively in 6 cases,from grade D to E in 4 cases and from grade B to C in 1 case.No obvious improvement of Frankel grade was observed in the other patient of grade B.The average Cobb angles were(76.0 ± 23.4) ° before surgery,( 15.5 ± 6.3 ) ° at one week after surgery and ( 16.0 ± 8.2) °at the last follow-up.The difference in the Cobb angle before and at one week after treatment was significant( t =3.41,P < 0.01 ).No difference was found in the Cobb angle between at one week after treatment and at the last follow-up (t =1.58,P > 0.05 ).All patients got bony fusion with Titanium net.No complications occurred with internal fixation.Conclusion Posterior vertebral column resection is a feasible method for the treatment of chronic thoracolumbar tuberculosis with secondary paraplegia.It achieves neurological decompression with high correction rate and minor injury,and no anterior surgery is needed.%目的 观察后路脊柱切除重建术治疗胸腰椎陈旧性结核继发截瘫的临床效果,为胸腰椎陈旧性脊柱结核继发截瘫手术治疗提供一种安

  18. Clinical observation of posterior decompression,interbody bone grafting and internal fixation for treatment of thoracolumbar burst fracture in one stage%一期后路椎管减压、椎间植骨内固定术治疗胸、腰椎爆裂性骨折的临床观察

    Institute of Scientific and Technical Information of China (English)

    张莹; 初同伟; 张超; 潘勇; 张正丰; 周跃

    2012-01-01

    Objective To investigate the management and clinical effect of subtotal corpectomy and three-column stabilization through posterior approach for thoracolumbar burst fractures. Methods Sixteen cases(9 males,7 females) with the thoracolumbar burst fractures in the hospital from Jan 2009 to Feb 2007 , were treated with posterior subtotal resection of vertebral body, implantation of titanium cage reconstruction,and pedicle screw internal fixation. The group age was from 23 to 55 years old. The site of the fracture were T12 in 7 cases, L1 in 4 cases,and L2 in 4 cases. According to Denis classification,all cases were burst fracture, including: ∧ type 4 cases,B type 8 cases,D type 3 cases,and K type 1 case. Six patients had neurologically complete paralysis,nine incomplete, and one intact. Pre and post operative neurological status,the correction and loss of Cobbs angle were evaluated. Results ∧11 patients during and after surgery were without severe complications,and postoperative clinical symptoms improved significantly. 13 patients were observed for more than 1 years. Three patients were lost in observed. Last follow-up vertebral Cobb angle was 8°- 16°(mean 8. 6°). Four patients Frankel A Grade of neurological function were with no significant recovery,and the rest had varying degrees of neurological recovery. Conclusion The subtotal corpectomy and three-column stabilization through posterior approach for thoracolumbar burst fractures,surgery time is short,and three-column injury in the treatment of thoracolumbar fractures is with satisfactory clinical results.%目的 探讨后路经椎根、椎管减压,椎间植骨内固定术治疗胸、腰椎爆裂性骨折中的临床疗效.方法 收集该科2009年1月至2010年2月应用经后路椎体次全切、钛网植骨重建、椎弓根螺钉内固定技术治疗胸、腰椎爆裂性骨折患者16例,其中,男9例,女7例;年龄23~55岁.T12骨折5例,L1骨折7例,L2骨折4例.Denis 分型

  19. Quantitative circumferential strain analysis using adenosine triphosphate-stress/rest 3-T tagged magnetic resonance to evaluate regional contractile dysfunction in ischemic heart disease

    Energy Technology Data Exchange (ETDEWEB)

    Nakamura, Masashi, E-mail: m.nakamura1230@gmail.com [Department of Radiology, Ehime University Graduate School of Medicine, Shitsukawa, Toon-city, Ehime 791-0295 (Japan); Kido, Tomoyuki [Department of Radiology, Saiseikai Matsuyama Hospital, Ehime 791-0295 (Japan); Kido, Teruhito; Tanabe, Yuki; Matsuda, Takuya; Nishiyama, Yoshiko; Miyagawa, Masao; Mochizuki, Teruhito [Department of Radiology, Ehime University Graduate School of Medicine, Shitsukawa, Toon-city, Ehime 791-0295 (Japan)

    2015-08-15

    Highlights: • Infarcted segments could be differentiated from non-ischemic and ischemic segments with high sensitivity and specificity under at rest conditions. • The time-to-peak circumferential strain values in infarcted segments were more significantly delayed than those in non-ischemic and ischemic segments. • Both circumferential strain and circumferential systolic strain rate values under ATP-stress conditions were significantly lower in ischemic segments than in non-ischemic segments. • Subtracting stress and rest circumferential strain had a higher diagnostic capability for ischemia relative to only utilizing rest or ATP-stress circumferential strain values. • A circumferential strain analysis using tagged MR can quantitatively assess contractile dysfunction in ischemic and infarcted myocardium. - Abstract: Purpose: We evaluated whether a quantitative circumferential strain (CS) analysis using adenosine triphosphate (ATP)-stress/rest 3-T tagged magnetic resonance (MR) imaging can depict myocardial ischemia as contractile dysfunction during stress in patients with suspected coronary artery disease (CAD). We evaluated whether it can differentiate between non-ischemia, myocardial ischemia, and infarction. We assessed its diagnostic performance in comparison with ATP-stress myocardial perfusion MR and late gadolinium enhancement (LGE)-MR imaging. Methods: In 38 patients suspected of having CAD, myocardial segments were categorized as non-ischemic (n = 485), ischemic (n = 74), or infarcted (n = 49) from the results of perfusion MR and LGE-MR. The peak negative CS value, peak circumferential systolic strain rate (CSR), and time-to-peak CS were measured in 16 segments. Results: A cutoff value of −12.0% for CS at rest allowed differentiation between infarcted and other segments with a sensitivity of 79%, specificity of 76%, accuracy of 76%, and an area under the curve (AUC) of 0.81. Additionally, a cutoff value of 477.3 ms for time-to-peak CS at rest

  20. The Aerodynamic Performance of an Over-the-Rotor Liner With Circumferential Grooves on a High Bypass Ratio Turbofan Rotor

    Science.gov (United States)

    Bozak, Richard F.; Hughes, Christopher E.; Buckley, James

    2013-01-01

    While liners have been utilized throughout turbofan ducts to attenuate fan noise, additional attenuation is obtainable by placing an acoustic liner over-the-rotor. Previous experiments have shown significant fan performance losses when acoustic liners are installed over-the-rotor. The fan blades induce an oscillating flow in the acoustic liners which results in a performance loss near the blade tip. An over-the-rotor liner was designed with circumferential grooves between the fan blade tips and the acoustic liner to reduce the oscillating flow in the acoustic liner. An experiment was conducted in the W-8 Single-Stage Axial Compressor Facility at NASA Glenn Research Center on a 1.5 pressure ratio fan to evaluate the impact of this over-the-rotor treatment design on fan aerodynamic performance. The addition of a circumferentially grooved over-the-rotor design between the fan blades and the acoustic liner reduced the performance loss, in terms of fan adiabatic efficiency, to less than 1 percent which is within the repeatability of this experiment.

  1. Refinement and evaluation of crack-opening-area analyses for circumferential through-wall cracks in pipes

    International Nuclear Information System (INIS)

    Leak-before-break (LBB) analyses for circumferentially cracked pipes are currently being conducted in the nuclear industry to justify elimination of pipe whip restraints and jet impingement shields which are present because of the expected dynamic effects from pipe rupture. The application of the LBB methodology frequently requires calculation of leak rates. These leak rates depend on the crack-opening area of a through-wall crack in the pipe. In addition to LBB analyses, which assume a hypothetical flaw size, there is also interest in the integrity of actual leaking cracks corresponding to current leakage detection requirements in NRC Regulatory Guide 1.45, or for assessing temporary repair of Class 2 and 3 pipes that have leaks as are being evaluated in ASME Section 11. This study was requested by the NRC to review, evaluate, and refine current analytical models for crack-opening-area analyses of pipes with circumferential through-wall cracks. Twenty-five pipe experiments were analyzed to determine the accuracy of the predictive models. Several practical aspects of crack-opening such as; crack-face pressure, off-center cracks, restraint of pressure-induced bending, cracks in thickness transition regions, weld residual stresses, crack-morphology models, and thermal-hydraulic analysis, were also investigated. 140 refs., 105 figs., 41 tabs

  2. Thoracolumbar Tuberculosis: Implications for Appropriate Management based on Disease Location and Proposal of a Novel Scoring System

    Directory of Open Access Journals (Sweden)

    Shahryar Noordin

    2011-01-01

    Full Text Available Objective: To identify factors indicating disease severity in patients with thoracolumbar tuberculosis requiring surgical intervention.Design: Medical charts of patients who underwent surgery for thoracic and lumbar spinal tuberculosis from 1990-2005 were reviewed. Patients with different levels of disease were compared in terms of neurological deficits, duration of symptoms, previous antituberculous therapy, nutritional status and associated co-morbids.Results: Ninety-three patients aged 7-77 years (mean age 40 years were included. Thoracic spine was involved in 80% of operated patients, and lumbar spine in 20%. Severe neurological impairment (Frankel A to C was present in 68% of patients with thoracic disease, as compared to 5% with lumbar disease (p<0.05. Postoperatively, complete neurological recovery occurred in 65% with thoracic versus 100% with lumbar disease (p<0.05. Based on the disease location and pertinent elements in clinical history, physical signs, radiographic and biochemical features, a scoring system was developed.Conclusion: In endemic areas with limited resources, strategies for cost-effective care are needed. By objectively outlining the treatment approach, the judicious use of surgery offers hope for enormous cost savings in countries endemic for tuberculosis, averting complications from disease progression

  3. Electrical high-frequency stimulation of the human thoracolumbar fascia evokes long-term potentiation-like pain amplification.

    Science.gov (United States)

    Schilder, Andreas; Magerl, Walter; Hoheisel, Ulrich; Klein, Thomas; Treede, Rolf-Detlef

    2016-10-01

    Nociceptive long-term potentiation, a use dependent increase in synaptic efficacy in the dorsal horn of the spinal cord is thought to contribute to the development of persistent pain states. So far, no study has analyzed the effects of high-frequency stimulation (HFS) of afferents from deep tissues (muscle and fascia) on pain perception in the back in humans. In 16 healthy volunteers, the multifidus muscle and the overlying thoracolumbar fascia were stimulated with electrical high-frequency pulses (5 × 100 pulses at 100 Hz) through bipolar concentric needle electrodes placed at lumbar level (L3/L4). Electrical pain thresholds were lower (P fascia compared with muscle stimulation (P fascia, from 8 to 12 numerical rating scale for muscle; both P Fascia HFS increased fascia pain ratings 2.17 times compared with the unconditioned control site (P fascia by 20% (P 60 minutes post-HFS, potentiation by fascia HFS was similar to that of skin HFS. These findings show that the spinal input from the fascia can induce long-term changes in pain sensitivity for at least 60 minutes making it a candidate potentially contributing to nonspecific low back pain.

  4. Circumferential fusion is dominant over posterolateral fusion in a long-term perspective: cost-utility evaluation of a randomized controlled trial in severe, chronic low back pain

    DEFF Research Database (Denmark)

    Soegaard, Rikke; Bünger, Cody E; Christiansen, Terkel;

    2007-01-01

    STUDY DESIGN: Cost-utility evaluation of a randomized, controlled trial with a 4- to 8-year follow-up. OBJECTIVE: To investigate the incremental cost per quality-adjusted-life-year (QALY) when comparing circumferential fusion to posterolateral fusion in a long-term, societal perspective. SUMMARY...... no significant difference between posterolateral and circumferential fusion reporting cost-effectiveness from a 2-year viewpoint. METHODS: A total of 146 patients were randomized to posterolateral or circumferential fusion and followed 4 to 8 years after surgery. The mean age of the cohort was 46 years (range...... of the labor market due to sickness. The EQ-5D instrument was applied for the measurement of health-related quality of life and costs (2004 U.S. dollars) were measured in a full-scale societal perspective. Productivity costs were valued by the Friction Cost method, and both costs and effects were discounted...

  5. Comparison of circumferential pulmonary vein anatomy mapping guided by 3D mapping versus a mesh mapping catheter

    Institute of Scientific and Technical Information of China (English)

    Yi-Wen Yan a; Gang Chen a; Feng Zhang; Song-Wen Chen; Wei-Dong Meng; Shao-Wen Liu

    2015-01-01

    Objective: Catheter-based pulmonary vein isolation (PVI) is an established therapy for paroxysmal atrial fibrillation. The high-density mesh mapper (HDMM) guides circumferential PV-atrium isolation without the 3D electroanatomic mapping. This study aims to compare circumferential pulmonary vein (CPV) anatomy mapping between guiding by a 3D mapping system and the HDMM. Methods: Forty-four consecutive patients with paroxysmal atrial fibrillation were scheduled for a first procedure for PVI. A CPV ostial anatomy map guided by HDMM was set up in the CARTO system while the operator was blinded to the CARTO screen. Then CARTO-guided ipsilateral PV maps were obtained and PVI was performed. This established another set of CPV ostial anatomy maps. The differences between the two mapping images were compared and analyzed. Results: All 176 PVs in 44 patients could be mapped by both HDMM and CARTO. About 44.9%of the PV ostial anatomies were generally similar between the two different map images. The average point-to-point straight distance between the HDMM-guided map and the CARTO-guided map was 6.2 ± 1.4 mm. The area of the circumferential right PV (CRPV) in the HDMM map was larger than that in the CARTO map (P ¼ 0.013). After a mean follow-up of 18.3 ± 4.3 months (6e24 months), 72.7%of patients (32/44) were free of atrial arrhythmia without anti-arrhythmic drugs (AADs). Conclusion: Compared to the CARTO-guided CPV anatomy image, a highly similar figure could be achieved by mapping guided by the HDMM. (Clinical trial.gov number, ChiCTR-TNRC-11001390.) Copyright © 2015, Chinese Medical Association Production. Production and hosting by Elsevier B.V. on behalf of KeAi Communications Co., Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

  6. Smallness kerf pedicle screw internal fixation cure thoracolumbar fracture%小切口椎弓根钉棒内固定治疗胸腰椎骨折

    Institute of Scientific and Technical Information of China (English)

    胡红耘

    2009-01-01

    Objective Smallness kerr rout of retreat pedicle screw posting restoration fixing cure thoracolum-bar fracture. Methods Versus 12 example thoracolumbar fracture adopt smallness keff micro-wound rout of retreat pedicle screw posting restoration fixing technology. Results 12 example fracture patient follow-up survey 8 loaf months to 2 year, average long dozen month, fracture restoration satisfaction, pedicle screw position all right, without height lost, without looseness,lapse sever natl. Conclusion Thoracolumbar fracture met pedicle screw push off resto-ration internal fixation, reestablish physiologic protrusion, operation kerf smallness, esthetic appearance, hemorrhage fewness wound reaction smallness, in favor of skill post-recovery.%目的 探讨椎弓根钉棒置入复位固定治疗胸腰椎骨折的手术入路方法.方法 对12例胸腰椎骨折的病例采用小切口微创后路椎弓根钉棒置入复位固定技术.结果 12例骨折患者随访8个月至2年,平均13个月,骨折复位满意,椎弓根钉棒位置良好,无高度丢失、无松动、失效、断钉.结论 胸腰椎骨折可选择后路小切口术式行椎弓根钉棒撑开复位内固定,重建生理前突,手术切口小、美观、出血少、创伤反应小,有利于术后恢复.

  7. 椎体成形术治疗胸腰椎骨折的临床效果观察%Clinical Effect of Vertebroplasty Treatment of Thoracolumbar Fractures

    Institute of Scientific and Technical Information of China (English)

    方德归

    2012-01-01

      Objective Explored the clinical effect of vertebroplasty treatment of thoracolumbar fractures. Methods Selected our hospital 88 patients with thoracolumbar fracture, randomly divided into observation group in 44 cases, control group in 44 cases, compared two groups patients’ clinical effects. Results After vertebroplasty treatment, the observation group’s excellent rate was 90.91%, and the control group after traditional conservative treatment, the excellent rate was 54.55%, the clinical effect of observation group was better than control group. Conclusion Vertebroplasty in the treatment of thoracolumbar fractures had exact clinical effect, worthy for clinical use.%  目的探讨椎体成形术治疗胸腰椎骨折的临床效果.方法选取本院收治的88例胸腰椎骨折患者,随机将这些患者分成观察组44例,对照组44例,比较两组患者治疗后的临床效果.结果观察组经椎体成形术治疗,效果优良率为90.91%,对照组经传统保守治疗,效果优良率为54.55%,观察组临床效果明显优于对照组.结论椎体成形术在治疗胸腰椎骨折方面具有确切的临床效果,值得临床推广使用.

  8. Percutaneous pedicle screw fixation through the pedicle of fractured vertebra in the treatment of type A thoracolumbar fractures using Sextant system: an analysis of 38 cases

    Institute of Scientific and Technical Information of China (English)

    WANG Hong-wei; LI Chang-qing; ZHOU Yue; ZHANG Zheng-feng; WANG Jian; CHU Tong-wei

    2010-01-01

    Objective:To prospectively evaluate the feasibility,safety and efficacy of the percutaneous pedicle screw fixation through the pedicle of fractured vertebra in the treatment of type A thoracolumbar fractures using Sextant system in the retrospective non-randomized case-control study.Methods:A total of 38 consecutive non-randomized patients with type A thoracolumbar fractures, which had been stabilized posteriorly from December 2006 to March 2009,were examined retrospectively more than 9 months after surgery.Twenty-one patients had been treated conventionally with open pedicle screw fixation (OPSF) and 17 patients received minimally invasive treatment with Sextant percutaneous pedicle screw fixation (SPPSF). As a method of evaluation, the incision size, the intraoperation and postoperative volume of blood loss, operation time, postoperative hospital stay, blood transfusion, the radiological assessment of the sagittal Cobb's angle, vertebral body angle and vertebral body height were recorded and compared.Results: All patients were followed up for 8-24 months (average 11.6 months). There were significant differences in the incision size, surgical blood loss, surgical draining loss, operation time, hospital stay after operation, blood transfusion, the proportion of antalgic supplement and postoperative incisional VAS between the two groups (P0.05),but there was significant difference in the postoperative anterior height of the fractured vertebra between the two groups (P<0.05).Conclusion: The percutaneous pedicle screw fixation through the pedicle of fractured vertebra using Sextant system is a good minimally-invasive surgical therapeutic choice for patients with type A thoracolumbar fracture except for that the SPPSF has a little insufficiency in resuming the anterior height of the fractured vertebra compared with OPSF.

  9. 经前路与后路手术治疗胸腰段骨折伴脊髓损伤临床对比研究%Clinical Comparative Study of the Effect Between Anterior and Posterior Surgical Treatment for Thoracolumbar Fracture with Spinal Cord Injury

    Institute of Scientific and Technical Information of China (English)

    袁小平

    2014-01-01

    Objective To study and analyze the clinical effects of anterior and posterior surgical treatments for thoracolumbar frac-ture with spinal cord injury. Methods 100 cases confirmedly diagnosed with thoracolumbar fracture with spinal cord injury in our hospital from March 2011 to March 2014 were selected as the subjects, and randomly divided into the control group and the ob-servation group with 50 cases in each in the case of informed consent. The control group was given the anterior surgery, and the observation group was given the posterior surgery. The patients were followed up for knowing the specific circumstances of them. The Frankel grading of spinal cord injury and spinal deformity angle correction of the two groups were observed and analyzed comparatively. Results The result of the study showed that, the difference in Frankel grading of spinal cord injury of the two groups before and after treatment was statistically significant (P0.05);the difference in spinal deformity angle correction of the two groups before and after treatment was sta-tistically significant (P0.05). Conclusion For patients with thoracolumbar fractures and spinal cord injury, both anterior and posterior surgical treatments have high clinical val-ue, the effects are significant, which can effectively correct the deformity after spinal fractures and improve the neurological func-tion, and are worthy of vigorous promotion clinically.%目的:研究分析经前路与后路手术治疗胸腰段骨折伴脊髓损伤的临床效果。方法选取2011年3月-2014年3月在该院确诊收治的100例胸腰段骨折伴脊髓损伤患者作为研究对象,在患者知情同意的情况下按数字随机分为对照组和观察组各50例。给予对照组患者前路手术治疗,而观察组患者给予后路手术治疗。术后对患者的具体情况进行随访,观察两组患者的Frankel脊髓损伤分级、脊柱畸形角的矫正情况,并作对比分析。结果研究结果显示

  10. 胸腰结合段侧面血管的影像解剖学研究%The Imaging Research for Thoracolumbar Spine Lateral Vascular Anatomy

    Institute of Scientific and Technical Information of China (English)

    欧阳志和; 欧阳厚淦

    2011-01-01

    Purpose To provide the anatomic basis of imaging for the segmental vessels of the thoracolumbar spine side and measure the distance between two adjacent segmental arteries in the three-dimensional images. Materials and Methods After conducting angiography for 30cases of normal adults through the ulnar vein, carring out thoracolumbar CT scans. In the image observation: The course and adjacent relationship of the segmental vessels. Measuring range: the distance between the the upper and lower segmental arteries of the middle line of spine side. Results We could observe the course and the adjacent relationship of thoracolumbar spine lateral vascular. That between the upper and lower segmental vessels consists a relatively non-vascular nerve safe zone where the intervertebral space locates. And we surveyed the related datas. Conclusion Three-dimensional reconstruction of CT images can effectively observe the course and adjacent relationship of the thoracolumbar spinal lateral segmental artery, and can accurately measure the safe zone.%目的:为脊柱胸腰结合段侧面的节段血管走行、'变异及毗邻关系提供影像学解剖基础.资料和方法:对32例正常成人经肘静脉造影后行脊柱胸腰段CT扫描,在图像上观察节段动脉的走行特点并在脊柱侧面正中线上对上、下位节段动脉之间的距离进行测量.结果:在影像三维图像上可观察脊柱胸腰段侧面,节段动脉较为恒定地存在并走行于相应椎体侧面中央浅沟内.上、下位节段动脉间构成了一个相对无血管、神经的安全区,椎间隙恰好位于该安全区中部.并且测量了相关数据,左右两侧比较无显著性差异(P>0.05).结论:CT三维重建图像能有效观察脊柱胸腰结合段侧面节段动脉的走行及毗邻关系,并能准确测量出安全区.

  11. Numerical simulation and experimental investigation of temperature distribution in the circumferentially butt GTAW of Incoloy 800H pipes

    International Nuclear Information System (INIS)

    The multi-pass circumferential butt GTAW process of Incoloy 800H pipes was modelled with the FEM in 3D. The element birth and death technique was used for the addition of filler material. Goldak model was used to simulate the distribution of arc heat source. The validation of the simulation model was carried out based on the precise temperature measurements within the HAZ of the welds by thermocouples as well as metallographic characterisation of the cross section of the welds. A good agreement was found between the simulation and experimental results for both thermal field and weld zone shape. The present model showed that increasing the heat input resulted in a wider weld zone as well as a higher HAZ peak temperature. These effects were related to the net heat input and not to either welding current or welding speed, individually. The developed simulation model is a useful tool to investigate the welding thermal regime and the weld pool profile.

  12. Transverse shear effects on the stress-intensity factor for a circumferentially cracked, specially orthotropic cylindrical shell

    Science.gov (United States)

    Delale, F.; Erdogan, F.

    1977-01-01

    The problem of a cylindrical shell containing a circumferential through crack is considered by taking into account the effect of transverse shear deformations. The formulation is given for a specially orthotropic material within the confines of a linearized shallow shell theory. The particular theory used permits the consideration of all five boundary conditions regarding moment and stress resultants on the crack surface. Consequently, aside from multiplicative constants representing the stress intensity factors, the membrane and bending components of the asymptotic stress fields near the crack tip are found to be identical. The stress intensity factors are calculated separately for a cylinder under a uniform membrane load, and that under a uniform bending moment. Sample results showing the nature of the out-of-plane crack surface displacement and the effect of the Poisson's ratio are presented.

  13. Ductile fracture behavior of 3-inch diameter carbon steel piping with a circumferential through-wall crack under bending load

    International Nuclear Information System (INIS)

    In order to introduce Leak-Before-Break (LBB) concept into the piping design criteria of the LWR pressure boundary pipings, it is necessary to investigate the pipe fracture behaviors, such as fracture condition and crack opening area, etc. At JAERI, pipe fracture tests of stainless steel and STS42 carbon steel pipes under bending load have been conducted as a part of the LBB research program. This report summarizes the four-point bending test results of 3-inch diameter STS42 carbon steel pipe with a circumferential through-wall crack. Tests were carried out at room temperature. In the tests, the fracture behavior of pipes was investigated to evolute the validity of Net-section collapse criterion, J-R curve and crack opening area. It is shown that the Net-section collapse criterion gives a conservative evaluation for the fracture load of 3-inch diameter carbon steel pipes. (author)

  14. Optimal patient positioning for ligamentotaxis during balloon kyphoplasty of the thoracolumbar and lumbar spine.

    LENUS (Irish Health Repository)

    Cawley, D T

    2011-06-01

    Percutaneous balloon kyphoplasty aims to restore vertebral height, correct angular deformity and stabilize the spine in the setting of vertebral compression fractures. The patient is positioned prone with supports under the iliac crests and upper thorax to allow gravity to extend the spine. In the treatment of lumbar fractures, we evaluated patient positioning with the contribution of hip extension to increase anterior ligamentotaxis, thus facilitating restoration of vertebral height. Our positioning technique created a mean anterior height increase from 72% to 78% of the average height of the cranial and caudal vertebrae (p=0.037). Balloon inflation did not significantly further increase anterior or posterior vertebral height, or Cobb angle.

  15. VIDEO-ASSISTED THORACOSCOPIC CORRECTION AND FUSION OF SCOLIOSIS

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    Objective To evaluate the operative technique and preliminary results of video-assisted thoracoscopic anterior correction and fusion of scoliosis.Methods Eleven cases underwent thoracoscopic anterior correction and fusion of scoliosis from March 2003 to April 2005 in our hospital were reviewed. They were all females with an average age of 13.1 years old. Of which, 9cases were idiopathic scoliosis, 1 case was congenital scoliosis, and 1 case was Marfan syndrome scoliosis. The coronal Cobb angle and apical vertebral translation before and after surgery as well as at final follow-up were measured. The operation time, blood loss during operation, and peri-operative complications were recorded.Results The mean operation time was 6. 4 hours, mean instrumented vertebrae were 6. 4 segments, and mean blood loss during operation was 364 mL. The coronal Cobb angles of the thoracic curve before and after surgery were 45.5° and 15.4° respectively, with an average correction rate of 65.4%. The lumbar curve was corrected from 28.4°to 11.8°, with an average simultaneous correction rate of 57.2%. All of the patients were followed up regularly with an average time of 21.4 months. At the final follow-up, the coronal Cobb angles of the thoracic and lumbar curves were 19. 0° and 20. 1°, with a 3.6° and 8. 3° loss of correction, respectively. The apical vertebral translation was improved from 32.3 mm to 10. 5 mm for the thoracic curve, and from 13. 1 mm to 8.2 mm for the lumbar curve. There were 6cases with peri-operative complications, including 1 case of thoracic effusion, 1 case of chylothorax, 1 case of locking plug loosing, 2 cases of aggravation of the unfused lumbar curve ( 1 case also with thoracolumbar kyphosis), and 1 case with a screw tip causing a contour deformity of the aorta. And 4 of them underwent revision surgery.Conclnsions Video- assisted thoracoscopic anterior correction and fusion of scoliosis has good correction capability, less intraoperative bleeding

  16. The stability of growth of a through-wall circumferential crack in a cylindrical pipe subjected to bending deformation

    International Nuclear Information System (INIS)

    Tada, Paris and Gamble have used the tearing modulus approach to examine the stability of growth of a through-wall circumferential crack in a 304 stainless steel circular cylindrical pipe subject to bending deformation. They showed that crack growth is stable, in the sense that growth requires the rotation imposed at the pipe-ends to be increased, provided the pipe length is less than a critical length Lsub(c), which is given by their analysis. The Tada-Paris-Gamble analysis focuses on the question of the stability, or otherwise, of crack growth at the onset of crack extension. The analysis does not consider the possibilities that (a) instability might occur after some stable crack growth, and (b) arrest might occur after some unstable growth. A study of these aspects of the circumferential crack growth problem using the tearing modulus approach is precluded by the geometry dependence of the J-crack growth resistance curve. Consequently the present paper uses a crack tip opening angle criterion to describe crack growth, and thereby demonstrates that possibilities (a) and (b) should both occur, depending on the initial crack length and pipe length. In terms of relevance to the technologically important problem of cracking in Boiling Water Reactor piping, the important conclusion stemming from the paper's analysis is that stability of crack growth after the onset of crack extension is assured if the pipe length is less than a critical length L'sub(c). L'sub(c) is less than Lsub(c), the critical length relevant to the onset of crack extension, but it is still appreciably greater than the pipe run lengths in actual reactor piping systems, and safety against guillotine failure of a pipe is therefore generally assured. (author)

  17. OUTCOME OF POSTEROLATERAL FUSION VERSUS CIRCUMFERENTIAL FUSION WITH CAGE FOR LUMBAR STENOSIS AND LOW DEGREE LUMBAR SPONDYLOLISTHESIS

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    Objective To evaluate the outcome of two methods for stabilization and fusion: posterolateral fusion and circumferential fusion involving posterior lumbar interbody fusion for lumbar stenosis with Grades 1 and 2 lumbar spondylolisthesis. Methods From April 1998 to April 2003, 45 patients suffering from lumbar stenosis with low degree lumbar spondylolisthesis treated in our hospital were retrospectively reviewed and assigned to two groups. Among them, 24 patients (group A) were treated with instrumented posterolateral fusion and 21 patients (group B) with instrumented circumferential fusion. The two groups were compared for clinical and radiological outcomes. Results All patients were followed up for 12 to 72 months. In group A, results showed preoperative clinical symptoms disappeared completely in 12 of 24 patients, and pain relief was seen in 91.7% (22/24). Two cases suffered from residual symptoms. Twenty-two cases obtained complete reduction of olisthy vertebral bodies, and anatomical reduction rate was 91.7%. No infection or neurological complication occurred in this group. In group B, results showed preoperative clinical symptoms disappeared completely in 13 of 21 patients, and pain relief was seen in 90. 5% ( 19/21 ). One case suffered from residual symptoms. Twenty cases obtained complete reduction of the olisthy vertebral bodies, and anatomical reduction rate was 95.2%. Four cases of infection or neurological complication occurred in this group. Both groups indicated no significant difference in clinical outcomes and anatomical reduction rate during followup. But group A had better intraoperative circumstances and postoperative outcome than group B, while group B had better postoperative parameters in X-ray of Angle of Slipping and Disc Index than group A.Conclusions The first choice of surgical method for lumbar stenosis with low degree lumbar spondylolisthesis is instrumented posterolateral fusion. Only when patients suffer from severe preoperative disc

  18. Depression of the Thoracolumbar Posterior Vertebral Body on the Estimation of Cement Leakage in Vertebroplasty and Kyphoplasty Operations

    Institute of Scientific and Technical Information of China (English)

    Hao Chen; Pu Jia; Li Bao; Fei Feng; He Yang; Jin-Jun Li; Hai Tang

    2015-01-01

    Background: The cross-section ofthoracolumbar vertebral body is kidney-shaped with depressed posterior boundary.The anterior wall of the vertebral canal is separated from the posterior wall of the vertebral body on the lateral X-ray image.This study was designed to determine the sagittal distance between the anterior border of the vertebral canal and the posterior border of the vertebral body (DBCV) and to analyze the potential role of DBCV in the estimation of cement leakage during percutaneous vertebroplasty (PVP) or percutaneous kyphoplasty (PKP).Methods: We retrospectively recruited 233 patients who had osteoporotic vertebral compression fractures and were treated with PVP or PKP.Computed tomography images ofT1 l-L2 normal vertebrae were measured to obtain DBCV.The distance from cement to the posterior wall of the vertebral body (DCPW) of thoracolumbar vertebrae was measured from C-ann images.The selected vertebrae were divided into two groups according to DCPW, with the fracture levels, fracture grades and leakage rates of the two groups compared.A relative operating characteristic (ROC) curve was applied to determine whether the DCPW difference can be used to estimate the degree of cement leakage.The data were processed by statistical software SPSS version 21.0 using independent sample t-test and Chi-square tests.Results: The maximum DBCV was 6.40 mm and the average DBCV was 3.74 ± 0.95 mm.DBCV appeared to be longer in males than in females, but the difference was not statistically significant.The average DCPW of type-B leakage vertebrae (2.59 ± 1.20 mm) was shorter than that of other vertebrae (7.83 ± 2.38 mm, P < 0.001).The leakage rate of group DCPW ≤6.40 mm was lower than that of group DCPW >6.40 mm for type-C and type-S, but much higher for type-B.ROC curve revealed that DCPW only has a predictive value for type-B leakage (area under the curve: 0.98, 95% confidence interval: 0.954.99, P < 0.001), and when the cut-offvalue was 4.05 mm, the

  19. The Retrospective Analysis of Posterior Short-Segment Pedicle Instrumentation without Fusion for Thoracolumbar Burst Fracture with Neurological Deficit

    Directory of Open Access Journals (Sweden)

    Zhouming Deng

    2014-01-01

    Full Text Available This study aims to investigate the efficacy of posterior short-segment pedicle instrumentation without fusion in curing thoracolumbar burst fracture. All of the 53 patients were treated with short-segment pedicle instrumentation and laminectomy without fusion, and the restoration of retropulsed bone fragments was conducted by a novel custom-designed repositor (RRBF. The mean operation time and blood loss during surgery were analyzed; the radiological index and neurological status were compared before and after the operation. The mean operation time was 93 min (range: 62–110 min and the mean intraoperative blood loss was 452 mL in all cases. The average canal encroachment was 50.04% and 10.92% prior to the surgery and at last followup, respectively (P<0.01. The preoperative kyphotic angle was 17.2 degree (±6.87 degrees, whereas it decreased to 8.42 degree (±4.99 degrees at last followup (P<0.01. Besides, the mean vertebral body height increased from 40.15% (±9.40% before surgery to 72.34% (±12.32% at last followup (P<0.01. 45 patients showed 1-2 grades improvement in Frankel’s scale at last followup. This technique allows for satisfactory canal clearance and restoration of vertebral body height and kyphotic angle, and it may promote the recovery of neurological function. However, further research is still necessary to confirm the efficacy of this treatment.

  20. 77 FR 72199 - Technical Corrections; Correction

    Science.gov (United States)

    2012-12-05

    ...) is correcting a final rule that was published in the Federal Register on July 6, 2012 (77 FR 39899), and effective on August 6, 2012. That final rule amended the NRC regulations to make technical... COMMISSION 10 CFR Part 171 RIN 3150-AJ16 Technical Corrections; Correction AGENCY: Nuclear...

  1. 胸腰段椎间盘突出症与休门病%Thoracolumbar disc herniation and Scheuermann's disease

    Institute of Scientific and Technical Information of China (English)

    石泽锋; 陈仲强; 刘宁; 齐强

    2011-01-01

    目的 探讨胸腰段椎间盘突出症(thoracolumbardisc herniation,TLDH)和休门病的内在联系以及休门病在TLDH发病中的作用.方法 2006年6月至2010年6月,以45例因TLDH(T10-11~L2-3)手术的患者作为研究组(TLDH组),及同期手术的低位(L3-4~L5S1)腰椎间盘突出症(1umbardisc herniation,LDH)患者中随机抽取45例作为对照组(LDH组).通过复习其CT、MRI和X线片,对比两组合并休门病和各种影像学休门样改变的比例,并比较两组的胸腰段后凸角度.进一步在TLDH组内部分别对比存在各种休门样改变的节段和无休门样改变节段合并椎间盘突出的比例.结果 TLDH组97.8%(44/45)的患者均合并休门病,LDH组仅为26.7%(12/45;x2=48.403,P=0.000).TLDH组出现各种休门样改变的比例均高于LDH组,分别为许莫结节66.7%(30/45)和15.6%(7/45;x2=24.278,P=0.000),终板不规则88.9%(40/45)和15.6%(7/45;x2=48.496,P=0.000),椎体后缘离断75.6%(34/45)和13.3%(6/45;x2=35.280,P=0.000),相邻椎体楔形变93.3%(42/45)和0%(x2=78.750,P=0.000).TLDH组患者平均胸腰段后凸角15.8°±6.9°,LDH组为4.8°±4.0°(t=7.703,P<0.001).TLDH组内,存在许莫结节(32.8%,39/119;x2=9.276,P=0.002),终板不规则(50.0%,55/110;x2=22.255,P=0.000),椎体后缘离断(100%,40/40;x2=69.421,P=0.000)和椎体楔形变(39.5%,58/147;x2=14.631,P=0.000)的节段发生椎间盘突出的比例均高于无休门样改变的节段(9.1%,4/44).结论 胸腰段椎间盘突出症与休门病关系密切,前者可能是后者的一种表现.许莫结节、终板不规则、椎体楔形变,尤其是椎体后缘离断,与椎间盘突出的发生有关.%Objective To explore the relationship between thoracolumbar disc herniation (TLDH) and Scheuermann1's disease (SD),as well as the role of SD in the etiology of TLDH.Methods From June 2006 to June 2010,45 patients with TLDH (T10-11-L2-3) underwent surgery in our department.Forty-five patients with lower lumbar disc herniation (LDH,L3-4-L5S1

  2. Total hip replacement using hemi-circumferential interposition acetabuloplasty for acetabular deficiency in post-Perthes deformities: technique and long-term results

    NARCIS (Netherlands)

    D. Haverkamp; H. Eijer; R.K. Marti

    2006-01-01

    We describe a technique of hemi-circumferential interposition grafting that allows placement of the cup in the anatomical position of the original acetabulum in the rare cases of post-Perthes or Perthes-like deformities of the femoral head combined with a steep and shallow acetabulum. This technique

  3. Rehabilitation program for prosthetic tracheojejunal voice production and swallowing function following circumferential pharyngolaryngectomy and neopharyngeal reconstruction with a jejunal free flap

    NARCIS (Netherlands)

    L.W.J. Baijens; R. Speijer; N. Roodenburg; F.J.M. Hilgers

    2011-01-01

    The case of a 68-year-old woman with postoperative speech and swallowing problems following a circumferential pharyngolaryngectomy and neopharyngeal reconstruction with a jejunal free flap is presented. The primary tumor was an extended papillary thyroid carcinoma (pT4N0M0). For vocal restoration, a

  4. Thoracolumbar fracture dislocations treated by posterior reduction interbody fusion and segmental instrumentation

    Directory of Open Access Journals (Sweden)

    Xiao-Bin Wang

    2014-01-01

    Materials and Methods: A retrospective review of 30 patients who had sustained fracture dislocation of the spine and underwent single stage posterior surgery between January 2007 and December 2011 was performed. All the patients underwent single stage posterior pedicle screw fixation, decompression and interbody fusion. Demographic data, medical records and radiographic images were reviewed thoroughly. Results: Ten females and 20 males with a mean age of 39.5 years were included in this study. Based on the AO classification, 13 cases were Type B1, 4 cases were B2, 4 were C1, 6 were C2 and 3 cases were C3. The average time of the surgical procedure was 220 min and the average blood loss was 550 mL. All of the patients were followed up for at least 2 years, with an average of 38 months. The mean preoperative kyphosis was 14.4° and reduced to -1.1° postoperatively. At the final followup, the mean kyphosis was 0.2°. The loss of correction was small (1.3° with no significant difference compared to postoperative kyphotic angle (P = 0.069. Twenty seven patients (90% achieved definitive bone fusion on X-ray or computed tomography imaging within 1 year followup. The other three patients were suspected possible pseudarthrosis. They remained asymptomatic without hardware failure or local pain at the last followup. Conclusion: Single stage posterior reduction using segmental pedicle screw instrumentation, combined with decompression and interbody fusion for the treatment of thoracic or lumbar fracture-dislocations is a safe, less traumatic and reliable technique. This procedure can achieve effective reduction, sagittal angle correction and solid fusion.

  5. Neurological complications in treatment of severe thoracolumbar spinal deformity with one stage posterior vertebral column resection%I期后路全脊椎切除治疗重度胸腰椎畸形的神经系统并发症

    Institute of Scientific and Technical Information of China (English)

    吕国华; 王孝宾; 王冰; 李晶; 康意军; 邓幼文; 刘伟东

    2011-01-01

    Objective To analyze the neurological complications in treatment of severe thoracolumbar spinal deformity with one stage posterior vertebral column resection (pVCR) and discuss the related risk factors. Methods There were 67 patients with severe thoracolumbar spinal deformity who underwent one-stage pVCR from February 2000 to September 2010.There were 29 males and 38 females at an average age of 31.4 years old(range,14-62 years).There were 21 patients at age less than 18 years old and 46 at age more than 18 years old.Patients were divided into four pathological types:severe scoliosis group(n=11,mean Cobb angle 90.4°),kyphoscoliosis group(n=25,mean scoliosis 94.5°,and mean kyphosis 65.5°),angular kyphosis group(n=28,mean kyphosis 74.3°)and global kyphosis group(n=3,mean kyphosis 91.1°).of all the patients,59 patients underwent primary surgery and eight underwent revision surgery.Surgical methods included posterior apex vertebral column resection,segemental pedicle screw fixation and correction as well as 360° bone fusion.Neurological complication was statistically analyzed. Results The average follow-up was 14 months (range,3-69 months),which showed severe neurologic complication in eight patients(11.9%)after surgery.Severe neurologic complication occurred in three patients (4.5%),among whom one patient presented delayed complete paraplegia 23 hours after surgery.Five patients had mild neurologic deficits(7.5%),the incidence of which was higher than 23.1%for thoracic osteotomy (P0.05). Conclusions pVCR is an effective surgical method for the correction of severe thoracolumbar spinal deformity.The neurological complications,however,should be paid attention to the surgeons.The risk factors for neurologic complications include improper manipulation,massive blood losing,preoperative neurologic compromise,osteotomy at thoracic rein,multi-level vertebrectomy,revision surgery and severe kyphosis.%目的 探讨应用I期后路全脊椎切除治疗重度胸腰椎畸

  6. The contrasts of thoracolumbar fracture's curative effect between vertebroplasty with short-segment pedicle instrument and simple internal fixation%短节段内固定加椎体成形术与单纯内固定治疗胸腰椎骨折疗效对比

    Institute of Scientific and Technical Information of China (English)

    陈光华; 赵静; 李永民; 李颉

    2011-01-01

    [Objective] To compare the effects of short-segment pedicle screw fixation with vertebroplasty and single short-segment pedicle screw fixation in patients with thoracolumbar vertebrae fractures. [Methods] Forty patients with thoracolumbar vertebrae fractures were treated with short-segment pedicle screw fixation. Fractures in Group A (n =20) were reinforced with vertebroplasty. Group B patients (n =20) were not treated with vertebroplasty. [Results] Kyphosis correction was achieved in two groups. During the follow-up period, kyphosis correction was maintained in Group B, but lost in Group A (Group A, -5.82%±1.34%, Group B, 0%) Group B had better results than Group A in the release of pain. (Group A, 90%, Group B, 100%). There was 1 patient experienced instrument failure in Group A (5%), but there was none in Group B (0%). [Conclusion] Short-segment pedicle screw fixation with vertebroplasty for the treatments of patients with thoracolumbar vertebrae fractures may achieve the stabilization of post column in spine, reproduce the biomechanic function of anterior and middle column. It is a better procedure than single short-segment pedicle screw fixation.%目的 比较短节段内固定加椎体成形术与单纯内固定治疗胸腰椎骨折疗效.方法 40例患者随机分两组,A组(n=20)采用单纯短节段椎弓根内固定,B组(n=20)采用短节段内固定加椎体成形术治疗胸腰椎骨折.结果 两组病例的术后后凸畸形均较术前明显矫正,但术后随访中两组伤椎矫正度丢失程度有显著差异.丢失率A组(-5.82%±134%)、B组(0%).两组病例的术后疼痛缓解程度有显著差异,A组缓解率(90%)、B组缓解率(100%)内固定失效比A组有1例发生断钉,失效率为(5%),B组未见内固定失效,失效率为(0%).结论 短节段内固定加椎体成形术治疗胸腰椎骨折可提高脊柱后结构稳定性,重建脊柱前中柱生物力学功能,较单纯内固定治疗胸腰椎骨折疗效好.

  7. The May 2005 eruption of Fernandina volcano, Galápagos: The first circumferential dike intrusion observed by GPS and InSAR

    Science.gov (United States)

    Chadwick, W.W.; Jonsson, Sigurjon; Geist, Dennis J.; Poland, M.; Johnson, Daniel J.; Batt, S.; Harpp, Karen S.; Ruiz, A.

    2011-01-01

    The May 2005 eruption of Fernandina volcano, Galápagos, occurred along circumferential fissures parallel to the caldera rim and fed lava flows down the steep southwestern slope of the volcano for several weeks. This was the first circumferential dike intrusion ever observed by both InSAR and GPS measurements and thus provides an opportunity to determine the subsurface geometry of these enigmatic structures that are common on Galápagos volcanoes but are rare elsewhere. Pre- and post- eruption ground deformation between 2002 and 2006 can be modeled by the inflation of two separate magma reservoirs beneath the caldera: a shallow sill at ~1 km depth and a deeper point-source at ~5 km depth, and we infer that this system also existed at the time of the 2005 eruption. The co-eruption deformation is dominated by uplift near the 2005 eruptive fissures, superimposed on a broad subsidence centered on the caldera. Modeling of the co-eruption deformation was performed by including various combinations of planar dislocations to simulate the 2005 circumferential dike intrusion. We found that a single planar dike could not match both the InSAR and GPS data. Our best-fit model includes three planar dikes connected along hinge lines to simulate a curved concave shell that is steeply dipping (~45–60°) toward the caldera at the surface and more gently dipping (~12–14°) at depth where it connects to the horizontal sub-caldera sill. The shallow sill is underlain by the deep point source. The geometry of this modeled magmatic system is consistent with the petrology of Fernandina lavas, which suggest that circumferential eruptions tap the shallowest parts of the system, whereas radial eruptions are fed from deeper levels. The recent history of eruptions at Fernandina is also consistent with the idea that circumferential and radial intrusions are sometimes in a stress-feedback relationship and alternate in time with one another.

  8. The Predictive Nursing Strategy and Result Analysis of Reducing Postoperative Abdominal Distension After Thoracolumbar Surgery%减少胸腰椎术后腹胀的预见性护理策略及其成效

    Institute of Scientific and Technical Information of China (English)

    王月红

    2016-01-01

    Based on the analysis of the causes of postoperative abdominal distention for patients with thoracolumbar fractures,a targeted nursing strategy is adopted to reduce the incidence of postoperative abdominal distension after thoracolumbar surgery.72 patients of thoracolumbar fractures are selected, and they are randomly divided into conventional nursing group and predictive nursing group.The con-ventional nursing group adopts orthopaedic conventional nursing methods,while the predictive nursing group uses targeted nursing methods to prevent postoperative abdominal distention.Comparing the inci-dence of abdominal distension in the two groups,we find out that predictive nursing methods can effec-tively reduce postoperative abdominal distension after thoracolumbar surgery and effectively improve the patients'quality of life after thoracolumbar surgery.%分析引起胸腰椎骨折患者术后腹胀的原因,采用有针对性的预见性护理策略,降低胸腰椎术后腹胀的发生率。选取胸腰椎骨折患者72例,随机分成常规护理组和预见性护理组。常规护理组采用骨科常规护理方法;预见性护理组采用预防术后腹胀针对性护理方法。通过对两组患者腹胀发生情况的比较发现,采用预见性护理措施对于减少胸腰椎术后腹胀的效果明显,可有效提高胸腰椎骨折患者术后的生活质量。

  9. 袖状蒂岛状环形包皮瓣尿道成形术一期修复会阴型尿道下裂%One-stage urethroplasty with circumferential vascular pedicle preputial island flap for perineal hypospadias

    Institute of Scientific and Technical Information of China (English)

    朱再生; 吴汉; 李瑞阳; 汪定海

    2010-01-01

    Objective To report the treatment of perineal hypospadias with one-stage urethroplaty with circumferential vascular pedicle preputial island flap. Methods A circumferential incision was made proximal to the corona and the urethral plate to correct chordee. A U-shaped skin incision was then made surrounding the meatus, and extended to the dorsal prepuce and parallel to the first incision. The tissue between the prepuce and dartos was dissected on the dorsum of penis to fix the prepuce as a neourethra.After mobilizing the loop shaped skin flap through the button-hole of the pedicle, the internal and external sides of the loop were sutured to construct a new urethra, the catheter was removed 10-14 days (mean,12.8 days ) after operation. Results Since 1997, 22 patients with perineal hypospadias were treated.Primary healing was achieved in 18 cases(81.8% ). Fistula happened in 4 patients. Among them, one case with meatal stenosis was treated with dilatation. Another 3 patients were reoperated. The neourethral flap was 3.50-18.00 cm (mean, 9.43 cm) in length. All patients were followed up for more than 6 months. Good cosmetic appearance was achieved in 72. 7% (16/22) of the patients. Conclusions The circumferential vascular pedicle preputial island flap has advantages of good blood supply and autograft for new meatus, which allows the chordee correction and urethroplaty at one stage. It is a good method for the treatment of perineal hypospadias with severe chordee and penoscrotal transposition.%目的 探讨袖状蒂岛状环形包皮瓣尿道成形术一期修复会阴型尿道下裂的临床效果.方法 距冠状沟0.5 cm处环形切开包皮内板和尿道板,脱套以纠正阴茎下曲.沿尿道板两侧平行切开,近端绕尿道口后会合,呈U形,远端环绕包皮到背侧,使新尿道皮瓣呈环状.解剖供应皮瓣的深层皮下组织与阴茎皮肤,形成血管蒂.经纽扣样孔隙,转移环状皮瓣至腹侧.缝合岛状环形皮瓣的内、外缘,形

  10. Radiofrequency Ablation Mapping with Circumferential Catheter for Paroxys-mal Atrial Fibrillation Originating From the Pulmonary Veins

    Institute of Scientific and Technical Information of China (English)

    刘震; 吴书林; 杨平珍; 方咸宏; 李海杰; 陈泗林; 詹贤章; 薛玉梅

    2002-01-01

    Objectives To assessed thefeasibility and effectiveness of electrophysiologicalmapping of pulmonary veins with a circumferential 10-electrode catheter and radiofrequency catheter abla-tion therapy for patients with paroxysmal atrial fibril-lation. Background Standard mapping and ablationof focal sources of atrial fibrillation are associated withvery long procedure times and low efficacy. Mappingand ablation pulmonary veins guide with a circularcatheter could overcome these limitations. Methods16 patients [male 11, female 5, mean age (51 +14.5) years] with paroxysmal atrial fibrillation refrac-tory to antiarrhythmic drugs were included in thisgroup. A circumferential 10-electrode catheter wasused to pulmonary vein mapping during sinus rhythm orCSd pacing to determine the origin of atrial prematurecontractions. When the ablative target pulmonary veinwas found, the pulmonary vein potentials' distributionand activation were assessment pulmonary veins' ostialablation was performed at the segments showing earliestactivation of pulnonary vein potentials. The end pointwas designed: 1 ) elimination of pulmonary vein po-tential; 2) pulmonary vein potential dissociation fromatrial waves; 3) atrial ectopic beats disappear. ResultsA total of 36 pulmonary veins were ablated, in-cluding 16 left superior, 12 right superior, 7 left in-ferior and 1 right inferior. 1 pulmonary vein in 2 pa-tients was ablated, 2 pulmonary veins in 8 patientswere ablated, 3 pulmonary veins were ablated in 5patients and 4 pulmonary veins were ablated in 1 pa-tient. Procedure duration and fluoroscopy time respec-tively were 186.7 _+ 63.8 min and 51.5 + 15.0 min.During the follow-up 1- 12 months, 11 patients(68.7 % ) were free of AF without any antiarrhythmicdrugs, 2 of them were reablation, effective in 3/16(18.7%) and unsuccessful in 2/16 (12.6%) . 2cases recurred with atrial premature, 1 was treated withamiodarone and the other was repeat electrophysiologi-cal mapping and ablation, 5 cases with

  11. Risk factors for adjacent segment degeneration after surgical correction of degenerative lumbar scoliosis

    Directory of Open Access Journals (Sweden)

    Kee-yong Ha

    2013-01-01

    Full Text Available Background: Degenerative lumbar scoliosis surgery can lead to development of adjacent segment degeneration (ASD after lumbar or thoracolumbar fusion. Its incidence, risk factors, morbidity and correlation between radiological and clinical symptoms of ASD have no consensus. We evaluated the correlation between the occurrence of radiologic adjacent segment disease and certain imperative parameters. Materials and Methods: 98 patients who had undergone surgical correction and lumbar/thoracolumbar fusion with pedicle screw instrumentation for degenerative lumbar scoliosis with a minimum 5 year followup were included in the study. We evaluated the correlation between the occurrence of radiologic adjacent segment disease and imperative patient parameters like age at operation, sex, body mass index (BMI, medical comorbidities and bone mineral density (BMD. The radiological parameters taken into consideration were Cobb′s angle, angle type, lumbar lordosis, pelvic incidence, intercristal line, preoperative existence of an ASD on plain radiograph and magnetic resonance imaging (MRI and surgical parameters were number of the fusion level, decompression level, floating OP (interlumbar fusion excluding L5-S1 level and posterolateral lumbar interbody fusion (PLIF. Clinical outcomes were assessed with the Visual Analogue Score (VAS and Oswestry Disability Index (ODI. Results: ASD was present in 44 (44.9% patients at an average period of 48.0 months (range 6-98 months. Factors related to occurrence of ASD were preoperative existence of disc degeneration (as revealed by MRI and age at operation ( P = 0.0001, 0.0364. There were no statistically significant differences between radiological adjacent segment degeneration and clinical results (VAS, P = 0.446; ODI, P = 0.531. Conclusions: Patients over the age of 65 years and with preoperative disc degeneration (as revealed by plain radiograph and MRI were at a higher risk of developing ASD.

  12. Analysis of the surgical outcome of asymmetrical pedicle subtraction osteotomy in ankylosing spondylitis patients with thoracolumbar kyphoscoliotic deformity%经椎弓根不对称截骨重建强直性脊柱炎胸腰椎侧后凸畸形患者双平面平衡

    Institute of Scientific and Technical Information of China (English)

    钱邦平; 邱勇; 潘涛; 胡俊; 王斌; 俞杨; 朱泽章; 孙旭; 季明亮

    2015-01-01

    Objective To investigate the influence of asymmetrical pedicle subtraction osteotomy (APSO) on the reconstruction of coronal and sagittal balance in ankylosing spondylitis (AS) patients with thoracolumbar kyphoscoliotic deformity.Methods Between October 2005 and June 2012,sixteen AS patients (13 males and 3 females) with a mean age of 35.4 years (range,22-48 years) with thoracolumbar kyphoscoliotic deformity undergoing APSO were included in this study.Preoperative,postoperative and last follow-up full-length antero-posterior and lateral spine radiographs were available.Coronal and sagittal parameters were measured,including Cobb angle,central sacral vertical line (CSVL),global kyphosis (GK),sagittal vertical axis (SVA),thoracic kyphosis (TK),lumbar lordosis (LL),pelvic tilt (PT),sacral slope (SS),and pelvic incidence (PI).SF-36 questionnaire was used to evaluate the quality of life of AS patients.The preoperative and postoperative data were compared by paired sample t test.Results The average time of follow-up was 36 months (range,24-63 months).The mean Cobb angle was improved from 25.8°to 7.6°,and the correction rate was 70.5%.The CSVL was corrected from 5.6 cm to 1.8 cm.The mean GK was corrected from 76.8° to 25.6°,and the correction rate was 66.7%.The SVA was restored from 15.1 cm to 3.8 cm.In addition,LL,PT,and SS were improved from-0.4°,33.6°,and 10.3° to 44.1°,22.6°,and 20.9°,respectively.In terms of Cobb angle,CSVL,GK,SVA,LL,PT,and SS,no significant differences were observed.The scores of bodily pain,general health,social and emotional functioning were significantly increased at the last follow-up.Conclusion AS patients with thoracolumbar kyphoscoliotic deformity have both sagittal and coronal imbalance with impairment in quality of life.APSO can achieve successful realignment of biplanar balance by correcting thoracolumbar kyphosis and scoliosis simultaneously,and improve the quality of life in AS patients with kyphoscoliotic deformity

  13. Multicenter retrospective evaluation of the validity of the Thoracolumbar Injury Classification and Severity Score system in children.

    Science.gov (United States)

    Sellin, Jonathan N; Steele, William J; Simpson, Lauren; Huff, Wei X; Lane, Brandon C; Chern, Joshua J; Fulkerson, Daniel H; Sayama, Christina M; Jea, Andrew

    2016-08-01

    OBJECTIVE The Thoracolumbar Injury Classification and Severity Score (TLICS) system was developed to streamline injury assessment and guide surgical decision making. To the best of the authors' knowledge, external validation in the pediatric age group has not been undertaken prior to this report. METHODS This study evaluated the use of the TLICS in a large retrospective series of children and adolescents treated at 4 pediatric medical centers (Texas Children's Hospital, Children's Healthcare of Atlanta, Riley Children's Hospital, and Doernbecher Children's Hospital). A total of 147 patients treated for traumatic thoracic or lumbar spine trauma between February 1, 2002, and September 1, 2015, were included in this study. Clinical and radiographic data were evaluated. Injuries were classified using American Spinal Injury Association (ASIA) status, Denis classification, and TLICS. RESULTS A total of 102 patients (69%) were treated conservatively, and 45 patients (31%) were treated surgically. All patients but one in the conservative group were classified as ASIA E. In this group, 86/102 patients (84%) had Denis type compression injuries. The TLICS in the conservative group ranged from 1 to 10 (mean 1.6). Overall, 93% of patients matched TLICS conservative treatment recommendations (score ≤ 3). No patients crossed over to the surgical group in delayed fashion. In the surgical group, 26/45 (58%) were ASIA E, whereas 19/45 (42%) had neurological deficits (ASIA A, B, C, or D). One of 45 (2%) patients was classified with Denis type compression injuries; 25/45 (56%) were classified with Denis type burst injuries; 14/45 (31%) were classified with Denis type seat belt injuries; and 5/45 (11%) were classified with Denis type fracture-dislocation injuries. The TLICS ranged from 2 to 10 (mean 6.4). Eighty-two percent of patients matched TLICS surgical treatment recommendations (score ≥ 5). No patients crossed over to the conservative management group. Eight patients (8

  14. Wall thickness measurement using resonant phenomena of circumferential Lamb waves generated by plural transducer elements located evenly on girth

    Science.gov (United States)

    Nishino, Hideo; Iwata, Kodai; Ishikawa, Masashi

    2016-07-01

    We present a novel method of measuring the pipe wall thickness using the resonance of the circumferential (C-) Lamb wave generated by a piezoelectric ring-shaped sensor (PS). The PS is a special device for an axially propagating torsional wave; however, the C-Lamb waves are generated simultaneously as spurious signals owing to the structure of the PS. Particularly under resonant conditions, the C-Lamb waves are dominantly generated, distorting the axially propagating wave. In this method, these troublesome spurious signals are used effectively for the measurement of the wall thickness under the PS location that is a dead zone of the PS itself. The method can compensate for its drawback, namely, the dead zone problem, without using additional instruments. In this study, the mechanisms of the generation and resonance of the C-Lamb waves were first explained. Secondly, the principle of the wall thickness estimation utilizing the resonance of the C-Lamb waves was proposed. Finally, experimental verifications were carried out. The estimated wall thicknesses agreed very well (maximum 1.5% error) with those measured by a micrometer caliper under suitable resonant conditions.

  15. Crack-tip Stress Field of Fully Circumferential Surface Cracked Pipe Under Combined Tension and Thermal Loads

    International Nuclear Information System (INIS)

    Under excessive plasticity, the fracture toughness of a material depends on its size and geometry. Under fully yielded conditions, the stresses in a material near its crack tip are not unique but rather depend on the geometry. Therefore, the single-parameter J-approach is limited to a high-constraint crack geometry. The JQ theory has been proposed for establishing the crack geometry constraints . This approach assumes that the crack-tip fields have two degrees of freedom. In this study, the crack-tip stress field of a fully circumferential surface-cracked pipe under combined loads is investigated on the basis of the JQ theory by using finite element analysis. The combined loads are a tensile axial force and the thermal gradient in the radial direction. Q-stresses of the crack geometry and its loading state are used to determine the constraint effects. The constraint effects of secondary loading are found to be greater than those of primary loading. Therefore, thermal shock is believed to be the most severe loading condition of constraint effects

  16. New matrix method for response analysis of circumferentially stiffened non-circular cylindrical shells under harmonic pressure

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    Based on the governing equation of vibration of a kind of cylindrical shells written in a matrix differential equation of the first order, a new matrix method is presented for steady-state vibration analysis of a noncircular cylindrical shell simply supported at two ends and circumferentially stiffened by rings under harmonic pressure. Its difference from the existing works by Yamada and Irie is that the matrix differential equation is solved by using the extended homogeneous capacity precision integration approach other than the Runge-Kutta-Gill integration method. The transfer matrix can easily be determined by a high precision integration scheme. In addition, besides the normal interacting forces, which were commonly adopted by researchers earlier, the tangential interacting forces between the cylindrical shell and the rings are considered at the same time by means of the Dirac-δ function. The effects of the exciting frequencies on displacements and stresses responses have been investigated. Numerical results show that the proposed method is more efficient than the aforementioned method.

  17. Nondestructive Evaluation of Functionally Graded Subsurface Damage on Cylinders in Nuclear Installations Based on Circumferential SH Waves

    Directory of Open Access Journals (Sweden)

    Zhen Qu

    2016-01-01

    Full Text Available Subsurface damage could affect the service life of structures. In nuclear engineering, nondestructive evaluation and detection of the evaluation of the subsurface damage region are of great importance to ensure the safety of nuclear installations. In this paper, we propose the use of circumferential horizontal shear (SH waves to detect mechanical properties of subsurface regions of damage on cylindrical structures. The regions of surface damage are considered to be functionally graded material (FGM and the cylinder is considered to be a layered structure. The Bessel functions and the power series technique are employed to solve the governing equations. By analyzing the SH waves in the 12Cr-ODS ferritic steel cylinder, which is frequently applied in the nuclear installations, we discuss the relationship between the phase velocities of SH waves in the cylinder with subsurface layers of damage and the mechanical properties of the subsurface damaged regions. The results show that the subsurface damage could lead to decrease of the SH waves’ phase velocity. The gradient parameters, which represent the degree of subsurface damage, can be evaluated by the variation of the SH waves’ phase velocity. Research results of this study can provide theoretical guidance in nondestructive evaluation for use in the analysis of the reliability and durability of nuclear installations.

  18. EXPERIMENTAL RESEARCH ON AERODYNAMIC PERFORMANCE AND EXIT FLOW FIELD OF LOW PRESSURE AXIAL FLOW FAN WITH CIRCUMFERENTIAL SKEWED BLADES

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    In this article, the low pressure axial flow fan with circumferential skewed rotor blade, including the radial blade, the forward-skewed blade and the backward-skewed blade, was studied with experimental methods. The aerodynamic performance of the rotors was measured. At the design condition at outlet of the rotors, detailed flow measurements were performed with a five-hole probe and a Hot-Wire Anemometer (HWA). The results show that compared to the radial rotor, the forward-skewed rotor demonstrates a wider Stable Operating Range (SOR), is able to reduce the total pressure loss in the hub region and make main loading of blade accumulating in the mid-span region. There is a wider wake in the upper mid-span region of the forward-skewed rotor. Compared to the radial rotor, in the backward-skewed rotor there is higher total pressure loss near the hub and shroud regions and lower loss in the mid-span region. In addition, the velocity deficit in the wake is lower at mid-span of the backward-skewed rotor than the forward-skewed rotor.

  19. Effect of anxiety and depression on the recurrence of persistent atrial fibrillation after circumferential pulmonary vein ablation

    Institute of Scientific and Technical Information of China (English)

    YU Sheng-bo; HU Wei; ZHAO Qing-yan; QIN Mu; HUANG He; CUI Hong-ying; HUANG Cong-xin

    2012-01-01

    Background The effects of anxiety and depression on the recurrence of persistent atrial fibrillation (AF) after circumferential pulmonary vein ablation (CPVA) are not clear.Whether CPVA can alleviate the anxiety and depression symptoms of persistent AF patients is unknown.Methods One hundred and sixty-four patients with persistent AF,of which 43 treated with CPVA (CPVA group) and 103 treated with anti-arrhythmics drugs (medicine group),were enrolled.The Zung Self-Rating Anxiety Scale (SAS),and Zung Self-Rating Depression Scale (SDS) were assessed before and 12 months after treatment in all patients.Results The scores of SAS (40.33±7.90 vs.49.76±9.52,P <0.01) and SDS (42.33±8.73 vs.48.17±8.77,P <0.01)decreased 12 months after CPVA.Over 12 months follow-up,AF relapsed in 17 patients in CPVA group.Compared with the data in the recurrent group (17 patients),the scores of SAS and SDS were significantly lower in the non-recurrent group (26 patients) at baseline.The results of multivariate Logistic regression analysis showed normal scores of SAS and SDS were the independent risk factors of AF recurrence after CPVA.Conclusions Anxiety and depression increase the recurrence risk of persistent AF after CPVA.CPVA can ameliorate the anxiety and depression symptoms in patients with persistent AF.

  20. Comparison between two types of"Scheuermann disease-like people": thoracolumbar disc herniation patients and healthy volunteers with radiological signs of Scheuermann's disease

    Institute of Scientific and Technical Information of China (English)

    Guo Xinhu; Chen Zhongqiang; Liu Ning; Guo Zhaoqing; Qi Qiang; Li Weishi; Zeng Yan

    2014-01-01

    Background Scheuermann's disease (SD) is a spinal disorder and includes both a classic form and an atypical form.Interestingly,its existence among the general population as well as the disc disease patients is common.One of our previous studies showed that about 18% of the hospital staff members meet the SD criteria.On the other hand,another study has demonstrated that 95.2% of the symptomatic thoracolumbar disc herniation (STLDH) patients meet the SD criteria,which suggests that STLDH is very likely a special form of SD.The purpose of this study was to discriminate the factors contributing to the development of STLDH by comparing STLDH patients with the healthy SD-like hospital staff members.Methods This is a retrospective study including 33 STLDH patients who met the SD criteria and 30 SD-like hospital staff members.The STLDH group was chosen from a group of patients who underwent surgery after a diagnosis of STLDH (T10/11-L1/2) at our hospital between June 2007 and June 2010.SD-like hospital staff members were chosen from a database created in 2007,which contained a lumbar MR and low back pain (LBP) questionnaire of 188 hospital staff members.The demographic and radiologic characteristics were compared between groups.Results There was no statistical difference in sex,age,and height between the two groups.The STLDH patients had higher body weight,boby mass index,and thoracolumbar kyphotic angle than SD-like hospital staff members.In addition,STLDH patients had more levels of Schmorl's nodes (3.5±1.7 vs.2.0±1.9,t=3.364,P=0.001) and irregular endplateson (4.0±1.9 vs.2.7±1.9,t=2.667,P=0.010) compared to the SD-like hospital staff members.Conclusions Higher body weight,higher body mass index,larger thoracolumbar kyphosis,and more Schmorl's nodes and irregular endplates on MR may be associated with the development of STLDH in "SD-like people."

  1. 椎弓根螺钉系统加自固化磷酸钙人工骨灌注治疗胸腰椎骨折%Treatment of thoracolumbar vertebrae fractures with vertebral pedicle screw system and artificial bones filled with autosolidification calcium phosphate cement

    Institute of Scientific and Technical Information of China (English)

    曾忠友; 金才益; 陆金荣; 王斌; 徐阿炳

    2001-01-01

    spinal height of the injured vertebra.  Conclusions With correct selection of operative indications and careful operations, the method with vertebral pedicle screw system and artificial bones filled with ACPC to treat thoracolumbar vertebrae fractures is an effective and safe method.

  2. 后路全脊椎截骨联合椎弓根螺钉治疗胸腰椎脊柱后凸畸形%Treatment for Thoracolumbar Kyphosis by Whole Posterior Spinal Osteotomy Combined with Pedicle Screw

    Institute of Scientific and Technical Information of China (English)

    蒋成; 蒋萍; 蔚芃

    2011-01-01

    Objective To explore the surgery assessment and clinical outcome of the treatment for thoracolumbar kyphosis by whole posterior spinal osteotomy combined with pedicle screw. Methods Fifteen patients including 11 males and 4 females with kyphosis were treated by posterior spinal osteotomy combined with pedicle screw from April 2004 to June 2010. The age of them ranged from 16 to 61 years old averaging at 49. There were 10 cases of old thoracolumbar fracture kyphosis, 3 cases of tuberculosis kyphosis, and 2 cases of poor vertebral growth. As for kyphosis vertices, there were 1 case of T9, 3 cases of T1l, 4 cases of T12, 5 cases of L1, and 2 cases of L2. Kyphosis Cobb angle ranged from 35° to 61°, averaging at 46°. Based on Franke Grade, there were 2 grade E cases, 8 grade D cases, 4 grade C cases, and 1 grade B case. Results Intraoperative blood loss was from 800 to 1 800 mL with an average of 1 000 mL) There was 1 case of left thoracic nerve root injury during operation and 1 case of lower extremity muscle strength hypoesthesia after operation. All the 15 patients were followed up for 10 to 30 months with an average time of 12 months. Six months after surgery, Cobb angle ranged from 5° to 10°, with an average correction rate of 86. 5%. Six to ten months after osteotomy, X ray showed a good bone healing condition. As for the recovery status of neurological function after surgery, All patients recovered to grade E except 1 patient who returned to grade D from grade B. No such complications as fixation without loosening, fracture or loss of correction degree occurred. Conclusion In posterior spinal osteotomy combined with pedicle screw fixation, decompression and correction can be carried out at the same time to correct a large degree of kyphosis with few complications. The clinical effect is obvious.%目的 探讨经后路全脊截骨联合椎弓根螺钉治疗胸腰椎脊柱后凸畸形的手术评估和临床疗效.方法 2004年4月-2010年6月采用后路脊

  3. Posterior Double Vertebral Column Resections Combined with Satellite Rod Technique to Correct Severe Congenital Angular Kyphosis.

    Science.gov (United States)

    Sun, Xu; Zhu, Ze-Zhang; Chen, Xi; Liu, Zhen; Wang, Bin; Qiu, Yong

    2016-08-01

    This paper presents a highly challenging technique involving posterior double vertebral column resections (VCRs) and satellite rods placement. This was a young adult case with severe angular thoracolumbar kyphosis of 101 degrees, secondary to anterior segmentation failure from T11 to L1 . There were hemivertebrae at T11 and T12 , and a wedged vertebra at L1 . He received double VCRs at T12 and T11 and instrumented fusion from T6 to L4 via a posterior only approach. Autologous grafts and a cage were placed between the bony surfaces of the osteotomy gap. Once closure of osteotomy was achieved, bilateral permanent CoCr rods were placed with addition of satellite rods. Postoperative X-ray demonstrated marked correction of kyphosis. On the 10(th) days after surgery, the patient was able to walk without assistance. In conclusion, double VCRs are effective to correct severe angular kyphosis, and addition of satellite rods may be imperative to enhance instrumentation strength and thus prevent correction loss. PMID:27627727

  4. Stress Intensity Factor for a Circumferential Crack in a Finite-Length Thin to Thick Walled Cylinder under an Arbitrary Biquadratic Stress Distribution on the Crack Surfaces

    OpenAIRE

    MESHII, Toshiyuki; WATANABE, Katsuhiko

    2001-01-01

    This paper presents the development of a practical method, by using prepared tabulated data, tocalculate the mode I stress intensity factor (SIF) for an inner surface circumferential crack in a finitelength cylinder. The crack surfaces are subjected to an axisymmetric stress with an arbitrary biquadraticradial distribution. The method was derived by applying the authors’ weight function for the crack. Thiswork is based on the thin shell theory and the Petroski-Achenbach method. Our method is ...

  5. Leakage Failure Reason Analysis of Circumferential Weld for Natural Gas Pipeline%天然气输送管道环焊缝泄漏失效分析

    Institute of Scientific and Technical Information of China (English)

    胡美娟; 刘迎来; 朱丽霞; 齐丽华; 杨放

    2014-01-01

    通过断口形貌、金相分析以及力学性能检测等方法对某X80天然气输送管道环焊缝泄漏产生的原因进行了失效分析。分析结果表明,环焊缝焊接接头的拉伸性能符合Q/SY GJX 0110-2007《西气东输二线管道工程线路焊接技术规范》要求,但焊缝和热影响区的冲击性能均未达到焊接技术规范的要求,管道环焊缝泄漏裂纹位于环焊缝6点位置根焊区域,此位置根焊进行过内补焊作业,补焊焊缝焊趾处存在的焊接缺陷是环焊缝开裂泄漏的主要原因。%The leakage failure reason of circumferential weld for some X80 natural gas pipeline was analyzed by means of fracture morphology, microstructure observation and mechanical properties tests. The results showed that the tensile performance of welded joint for circumferential weld accord with the requirements of Q/SY GJX 0110-2007 Welding Technology Specification for the Second West-to-East Gas Pipeline Project, and the impact toughness of weld and HAZ both fail to meet the welding requirements of technical specification. The leaking crack of circumferential weld lies in the six position of root welding zone, and repair welding was implemented in the six position of root welding. The main leakage failure reason of circumferential weld was the welding defects close to the toe zone of the repair welding.

  6. 胸腰段脊柱骨折的手术治疗研究%The research of surgical treatment of thoracolumbar spine fractures

    Institute of Scientific and Technical Information of China (English)

    陈孔宁; 刘成招; 王春

    2014-01-01

    Objective To investigate the clinical efficacy of surgical posterior thoracolumbar spine fractures. Methods 80cases of thoracolumbar spine fracture patients in our hospital from February in 2011 to October in 2013 were seleted for the study. They were treated with posterior surgery, and the clinical efficacy of the patients was observed. Results All of the patients were cured of 51 cases (63.75%), 23 cases (28.75%) were effective, and total effective rate was 92.50%. After posterior surgery, tactile scores was(74.8±14.8) and sports scores was (72.1±24.8) which were excellent than treated before. There was a significant difference between them(P <0.05). Conclusion The implementation of thoracolumbar spine fractures in patients with posterior surgery can significantly improve the clinical treatment of patients with efficiency, and improve clinical symptoms of patients, moreover, posterior surgery can lower incidence of postoperative complications. It's an effective way to treat thoracolumbar spine fractures.%目的:探讨后路手术治疗胸腰段脊柱骨折的临床疗效。方法选取2011年2月~2013年10月我院接收的80例胸腰段脊柱骨折患者为研究对象,所有患者均实施后路手术治疗,观察患者手术治疗的临床疗效。结果80例患者经后路手术治疗后,显效51例(63.75%),有效23例(28.75%),总有效率为92.50%;治疗后患者手术后嗅觉评分为(74.8±14.8),运动评分为(72.1±24.8),均明显高于手术前,手术前后比较存在显著性差异(P<0.05)。结论对胸腰段脊柱骨折患者实施后路手术治疗可显著提高患者的临床治疗有效率,改善患者的临床症状,且术后并发症发生率较低,临床疗效显著,是治疗胸腰段脊柱骨折的有效方法。

  7. Surgical Decompression in Dogs with Thoracolumbar Intervertebral Disc Disease and Loss of Deep Pain Perception: A Retrospective Study of 46 Cases

    Directory of Open Access Journals (Sweden)

    Puerto David A

    2005-06-01

    Full Text Available The case details and outcome after surgical decompression of 46 dogs with thoracolumbar intervertebral disc disease with loss of deep pain perception prior to surgery were reviewed. Nineteen dogs (41.3% recovered with a median follow-up period of 12.5 months. Recovery was defined as an ambulatory paraparesis, or better, with urinary and fecal continence. There was a better outcome in dogs with loss of deep pain for less than 24 hours prior to surgery (19/41; 46.3% recovered than in dogs without deep pain perception for more than 24 hours (0/5; 0% recovered. Dogs with deep pain perception present at two weeks postoperatively had significantly higher success rate (8/12; 66.7% recovered than dogs without deep pain perception at this time period (1/10; 10.0% recovered. The return of deep pain perception by two weeks postoperatively can be a useful positive prognostic indicator.

  8. 后路椎弓根钉短节段固定治疗青壮年胸腰椎骨折%Treatment of Thoracolumbar Fractures of Youngsters with Short-segment Pedicle Instrumentation

    Institute of Scientific and Technical Information of China (English)

    张中伟; 胡隽宇; 龚遂良; 王卫明

    2011-01-01

    目的 比较长节段和短节段椎弓根系统治疗青壮年胸腰椎骨折的效果.观察常用的脊柱骨折分型对短节段固定预后的影响.方法 对72例胸腰椎骨折的青壮年患者随机采用后路短节段和长节段固定手术,随访观察有无内固定失败,X线检查测量12个月后的后凸矫形丢失度.短节段固定按脊柱AO分型和载荷-分享分型不同分组后,比较各组结果差异.患者术后均不予外固定.结果 随访平均矫形丢失度,长节段组为6.1°,短节段组为7.3°,差异无统计学意义(P>0.05).短节段固定中,不同脊柱AO分型(A、B、C)和载荷-分享分型(≤6、≥7)组别的矫形丢失度差异均无统计学意义(P>0.05).结论 随着器械和手术技术的进步,青壮年患者胸腰段骨折,即便是严重不稳定骨折,采用短节段椎弓根系统固定可取得较好效果,患者术后也无需外固定.%Objective To compare the effect of short-segment and long-segment pedicle instrumentation in treatment of thoraeolumbar fractures of youngsters and determine whether common classification systems can predict the radiologic outcome of short-segment fixation.Methods A retrospective radiographic review was conducted for 72 thoraeolumbar fractures of youngsters treated with long-segment (35 patients, group L) and short-segment (37 patients, group S) posterior instrumentation to determine the rate of correction loss (12 months later) and instrumentation failure. The outcome of group S in relation to the load sharing classification of spine fracture system and the AO classification of fractures system were compared. No postoperative bracing was used. Results No failures occurred in both groups. An average loss of correction of 6.1 degree (group L) and 7.3 degree (group S) were observed. No relationship was shown between loss of correction and load sharing classification (≤6 or ≥7 points), loss of correction and AO classification. Conclusion With modem

  9. Accuracy of High-Resolution MRI with Lumen Distention in Rectal Cancer Staging and Circumferential Margin Involvement Prediction

    International Nuclear Information System (INIS)

    To evaluate the accuracy of magnetic resonance imaging (MRI) with lumen distention for rectal cancer staging and circumferential resection margin (CRM) involvement prediction. Seventy-three patients with primary rectal cancer underwent high-resolution MRI with a phased-array coil performed using 60-80 mL room air rectal distention, 1-3 weeks before surgery. MRI results were compared to postoperative histopathological findings. The overall MRI T staging accuracy was calculated. CRM involvement prediction and the N staging, the accuracy, sensitivity, specificity, positive predictive value (PPV) and negative predictive value (NPV) were assessed for each T stage. The agreement between MRI and histological results was assessed using weighted-kappa statistics. The overall MRI accuracy for T staging was 93.6% (k = 0.85). The accuracy, sensitivity, specificity, PPV and NPV for each T stage were as follows: 91.8%, 86.2%, 95.5%, 92.6% and 91.3% for the group ≤ T2; 90.4%, 94.6%, 86.1%, 87.5% and 94% for T3; 98,6%, 85.7%, 100%, 100% and 98.5% for T4, respectively. The predictive CRM accuracy was 94.5% (k = 0.86); the sensitivity, specificity, PPV and NPV were 89.5%, 96.3%, 89.5%, and 96.3% respectively. The N staging accuracy was 68.49% (k = 0.4). MRI performed with rectal lumen distention has proved to be an effective technique both for rectal cancer staging and involved CRM predicting

  10. Accuracy of High-Resolution MRI with Lumen Distention in Rectal Cancer Staging and Circumferential Margin Involvement Prediction

    Energy Technology Data Exchange (ETDEWEB)

    Iannicelli, Elsa; Di Renzo, Sara [Radiology Institute, Faculty of Medicine and Psychology, University of Rome, Sapienza, Sant' Andrea Hospital, Rome 00189 (Italy); Department of Surgical and Medical Sciences and Translational Medicine, Faculty of Medicine and Psychology, University of Rome, Sapienza, Sant' Andrea Hospital, Rome 00189 (Italy); Ferri, Mario [Department of Surgical and Medical Sciences and Translational Medicine, Faculty of Medicine and Psychology, University of Rome, Sapienza, Sant' Andrea Hospital, Rome 00189 (Italy); Pilozzi, Emanuela [Department of Clinical and Molecular Sciences, Faculty of Medicine and Psychology, University of Rome, Sapienza, Sant' Andrea Hospital, Rome 00189 (Italy); Di Girolamo, Marco; Sapori, Alessandra [Radiology Institute, Faculty of Medicine and Psychology, University of Rome, Sapienza, Sant' Andrea Hospital, Rome 00189 (Italy); Department of Surgical and Medical Sciences and Translational Medicine, Faculty of Medicine and Psychology, University of Rome, Sapienza, Sant' Andrea Hospital, Rome 00189 (Italy); Ziparo, Vincenzo [Department of Surgical and Medical Sciences and Translational Medicine, Faculty of Medicine and Psychology, University of Rome, Sapienza, Sant' Andrea Hospital, Rome 00189 (Italy); David, Vincenzo [Radiology Institute, Faculty of Medicine and Psychology, University of Rome, Sapienza, Sant' Andrea Hospital, Rome 00189 (Italy); Department of Surgical and Medical Sciences and Translational Medicine, Faculty of Medicine and Psychology, University of Rome, Sapienza, Sant' Andrea Hospital, Rome 00189 (Italy)

    2014-07-01

    To evaluate the accuracy of magnetic resonance imaging (MRI) with lumen distention for rectal cancer staging and circumferential resection margin (CRM) involvement prediction. Seventy-three patients with primary rectal cancer underwent high-resolution MRI with a phased-array coil performed using 60-80 mL room air rectal distention, 1-3 weeks before surgery. MRI results were compared to postoperative histopathological findings. The overall MRI T staging accuracy was calculated. CRM involvement prediction and the N staging, the accuracy, sensitivity, specificity, positive predictive value (PPV) and negative predictive value (NPV) were assessed for each T stage. The agreement between MRI and histological results was assessed using weighted-kappa statistics. The overall MRI accuracy for T staging was 93.6% (k = 0.85). The accuracy, sensitivity, specificity, PPV and NPV for each T stage were as follows: 91.8%, 86.2%, 95.5%, 92.6% and 91.3% for the group ≤ T2; 90.4%, 94.6%, 86.1%, 87.5% and 94% for T3; 98,6%, 85.7%, 100%, 100% and 98.5% for T4, respectively. The predictive CRM accuracy was 94.5% (k = 0.86); the sensitivity, specificity, PPV and NPV were 89.5%, 96.3%, 89.5%, and 96.3% respectively. The N staging accuracy was 68.49% (k = 0.4). MRI performed with rectal lumen distention has proved to be an effective technique both for rectal cancer staging and involved CRM predicting.

  11. Sparing Sphincters and Laparoscopic Resection Improve Survival by Optimizing the Circumferential Resection Margin in Rectal Cancer Patients.

    Science.gov (United States)

    Keskin, Metin; Bayraktar, Adem; Sivirikoz, Emre; Yegen, Gülcin; Karip, Bora; Saglam, Esra; Bulut, Mehmet Türker; Balik, Emre

    2016-02-01

    The goal of rectal cancer treatment is to minimize the local recurrence rate and extend the disease-free survival period and survival. For this aim, obtainment of negative circumferential radial margin (CRM) plays an important role. This study evaluated predictive factors for positive CRM status and its effect on patient survival in mid- and distal rectal tumors.Patients who underwent curative resection for rectal cancer were included. The main factors were demographic data, tumor location, surgical technique, neoadjuvant therapy, tumor diameter, tumor depth, lymph node metastasis, mesorectal integrity, CRM, the rate of local recurrence, distant metastasis, and overall and disease-free survival. Statistical analyses were performed by using the Chi-squared test, Fisher exact test, Student t test, Mann-Whitney U test and the Mantel-Cox log-rank sum test.A total of 420 patients were included, 232 (55%) of whom were male. We observed no significant differences in patient characteristics or surgical treatment between the patients who had positive CRM and who had negative CRM, but a higher positive CRM rate was observed in patients undergone abdominoperineal resection (APR) (P CRM status. Logistic regression analysis revealed that APR (P CRM status. Moreover, positive CRM was associated with decreased 5-year overall and disease-free survival (P = 0.002 and P = 0.004, respectively).This large single-institution series demonstrated that APR and open resection were independent predictive factors for positive CRM status in rectal cancer. Positive CRM independently decreased the 5-year overall and disease-free survival rates.

  12. Fracture Toughness (K1C evaluation for dual phase medium carbon low alloy steels using circumferential notched tensile (CNT specimens

    Directory of Open Access Journals (Sweden)

    Kenneth Kanayo Alaneme

    2011-01-01

    Full Text Available The fracture behavior of dual phase medium carbon low alloy steels produced using two different chemical compositions (A - 0.34C, 0.75Mn, 0.12Cr, 0.13Ni steel and B - 0.3C, 0.97Mn, 0.15Cr steel was investigated using circumferential notched tensile (CNT specimens. Intercritical treatments were performed on samples with composition A by 1 austenitizing at 860 °C for 1 hour cooling in air, then treating at 770 °C for 30 minutes before oil quenching; 2 austenitizing at 860 °C for 1 hour quenching in oil, then treating at 770 °C for 30 minutes before quenching in oil; and 3 austenitizing at 860 °C for 1 hour, super-cooling to 770 °C and then quenching in oil. Samples of composition B were subjected to intercritical treatment at temperatures of 740, 760, and 780 °C for 30 minutes, followed by quenching rapidly in oil. Tensile testing was then performed on specimens without notches and the CNT specimens. It was observed that the dual phase steel produced from procedure (2 yielded a fine distribution of ferrite and martensite which gave the best combination of tensile properties and fracture toughness for composition A while the dual phase structure produced by treating at 760 °C yielded the best combination of tensile properties and fracture toughness for composition B. The fracture toughness results evaluated from the test were found to be valid (in plain strain condition and a high correlation between the fracture toughness and notch tensile strength was observed. The fracture toughness values were also found to be in close agreement with data available in literature.

  13. NWS Corrections to Observations

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Form B-14 is the National Weather Service form entitled 'Notice of Corrections to Weather Records.' The forms are used to make corrections to observations on forms...

  14. The May 2005 eruption of Fernandina volcano, Galápagos: The first circumferential dike intrusion observed by GPS and InSAR

    KAUST Repository

    Chadwick, William W Jr

    2010-12-15

    The May 2005 eruption of Fernandina volcano, Galápagos, occurred along circumferential fissures parallel to the caldera rim and fed lava flows down the steep southwestern slope of the volcano for several weeks. This was the first circumferential dike intrusion ever observed by both InSAR and GPS measurements and thus provides an opportunity to determine the subsurface geometry of these enigmatic structures that are common on Galápagos volcanoes but are rare elsewhere. Pre- and post- eruption ground deformation between 2002 and 2006 can be modeled by the inflation of two separate magma reservoirs beneath the caldera: a shallow sill at ~1 km depth and a deeper point-source at ~5 km depth, and we infer that this system also existed at the time of the 2005 eruption. The co-eruption deformation is dominated by uplift near the 2005 eruptive fissures, superimposed on a broad subsidence centered on the caldera. Modeling of the co-eruption deformation was performed by including various combinations of planar dislocations to simulate the 2005 circumferential dike intrusion. We found that a single planar dike could not match both the InSAR and GPS data. Our best-fit model includes three planar dikes connected along hinge lines to simulate a curved concave shell that is steeply dipping (~45-60°) toward the caldera at the surface and more gently dipping (~12-14°) at depth where it connects to the horizontal sub-caldera sill. The shallow sill is underlain by the deep point source. The geometry of this modeled magmatic system is consistent with the petrology of Fernandina lavas, which suggest that circumferential eruptions tap the shallowest parts of the system, whereas radial eruptions are fed from deeper levels. The recent history of eruptions at Fernandina is also consistent with the idea that circumferential and radial intrusions are sometimes in a stress-feedback relationship and alternate in time with one another. © 2010 Springer-Verlag.

  15. Error Correction in Classroom

    Institute of Scientific and Technical Information of China (English)

    Dr. Grace Zhang

    2000-01-01

    Error correction is an important issue in foreign language acquisition. This paper investigates how students feel about the way in which error correction should take place in a Chinese-as-a foreign-language classroom, based on empirical data of a large scale. The study shows that there is a general consensus that error correction is necessary. In terms of correction strategy, the students preferred a combination of direct and indirect corrections, or a direct only correction. The former choice indicates that students would be happy to take either so long as the correction gets done.Most students didn't mind peer correcting provided it is conducted in a constructive way. More than halfofthe students would feel uncomfortable ifthe same error they make in class is corrected consecutively more than three times. Taking these findings into consideration, we may want to cncourage peer correcting, use a combination of correction strategies (direct only if suitable) and do it in a non-threatening and sensitive way. It is hoped that this study would contribute to the effectiveness of error correction in a Chinese language classroom and it may also have a wider implication on other languages.

  16. Type AO-C1 thoracolumbar vertebral fracture-dislocations:four-screw two-rod single-segment reduction fixation%AO-C1型胸腰椎骨折脱位:可选择4钉2棒置入单节段复位固定

    Institute of Scientific and Technical Information of China (English)

    唐焕章; 徐皓; 董亮; 赵晓明

    2015-01-01

    BACKGROUND:The type AO-C1 thoracolumbar acute spine injury is a kind of high-energy instable injury, can cause thoracolumbar fracture-dislocation, and mainly associated with spinal nerve injury. Generaly, al needs to posterior open reduction, decompression, bone graft fusion and multiple-segmental internal fixation of pedicle screw rod system, which causes excessive loss of spinal movement segment and a large number of application of internal fixators. OBJECTIVE:To evaluate the treatment effect of posterior pedicle screw mono-segmental internal fixation for treatment of the type AO-C1 thoracolumbar vertebrae fracture-dislocations. METHODS:From January 2008 to December 2013, 17 cases of type AO-C1 thoracolumbar fracture-dislocation were folowed up. Al patients were treated with one-stage posterior open reduction and pedicle screw-rod fixation. Of them, eight cases received four screws and two rods for single-segment fixation in upper and lower vertebrae adjacent to intervertebral space after dislocation (4-screw 2-rod group). Nine cases received eight screws and two rods for multiple-segment fixation in the upper and lower vertebrae adjacent to intervertebral space after dislocation (8-screw 2-rod group). Operative time and intraoperative blood loss were compared between the two groups. The Cobb’s angle was measured on lateral X-ray film of two groups preoperatively and 1 week postoperatively and during the final folow-up. The neurological function was evaluated by Frankel classification. The visual analogue scale was adopted to assess the degree of low back pain. RESULTS AND CONCLUSION:Patients were folowed up for 1 to 5 years. Significant differences were detected in the operative time between the two groups, and operative time was better in the 4-screw 2-rod group than in the 8-screw 2-rod group (P < 0.05). No significant difference was found in intraoperative blood loss between the two groups. The deformity of fracture-dislocation had been corrected, and the

  17. Wiltse入路经椎弓根植骨治疗胸腰椎骨折%Transpedicular bone graft for the treatment of thoracolumbar vertebral fractures through Wiltse approach

    Institute of Scientific and Technical Information of China (English)

    王想福; 王兴盛

    2013-01-01

    age from 14 to 55 years old (mean,41 years old).The time from injury to operation from 2 to 15 d(mean,3 d).Twenty-five cases were caused by falling down,7 cases were caused by slipping,'20 cases were caused by car accident and 4 cases were caused by crush trauma.MRI was performed before operation to exclude pathological fracture.The distance between multifidus muscle and longissimus to midcourt line was measured.Self-made trocar was applied in operation.According to AO classification,there were 33 cases with type A1 compression fracture,5 cases with type A2 cleavage fracture and 18 cases with type A3 burst fracture.Sixteen cases of the 56 cases combined with spinal cord injury.Based on Frankel neurologic grading system,preoperative neurological function was grade B in 5 cases,grade C in 2 cases,gade D in 9 cases.Preoperative Denis gading were P5.Frankel and lumbago Denis clssification were used to evaluate neurological function and lumbago.The imaging data before,after operation and the latest follow-up were used to evaluate correction vision.Results:All patients were followed up over 24 months.At the time of the latest follow-up,Frankel B were 3 cases,Frankel C were 2 cases,Frankel D were 4 cases and Frankel E were 7 cases.According to lumbago Denis clssification,P1 (painlessness) were 32 cases,P2 (slight pain without treatment) were 18 cases,P3 (moderate pain and taking medicine occasionally) were 6 cases.The anterior vertebral height improved from preoperative (13.38±4.72) mm to postoperative (22.18± 1.44) mm.The Cobb's angle decreased from preoperative (28.39±2.64) ° to (10.07±3.05)°.There were no nails broken,rod broken,internal fixation lossen and vertebral body recompression.Conclusion:Transpedicular bone graft for thoracolumbar fractures through Wiltse approach can reduce intraoperative blood loss and postoperative complications,and aviod "eggshell" vertebral body.Mastering revealed way,drafting detailed preoperative plan and eariler exercise is the key

  18. Anatomy of thoracolumbar spinal cord anterior operation and its clinical application%胸腰段脊椎前路手术解剖与临床应用

    Institute of Scientific and Technical Information of China (English)

    曾志远; 黄杰聪; 陈小青; 蔡雅谷; 卢天祥

    2014-01-01

    Objective To Study the clinical effect of the thoracolumbar Anterior Operation (T10-L3) approach anatomy guidance anterior corpectomy decompression bone internal fixation. Methods Based on the anatomy, study of the thoracolumbar spine (T12-L3) of 10 (male 6, female 4) adult cadaveric specimens, and 30 cases of patients with spinal cord compression mainly from anterior thoracolumbar burst fracture from 2010 January to 2013 October were given scattered thoracolumbar anterior decompression bone grafting and internal fixation. Among them, 21 cases were male, 9 cases were female; age was 20-65 years old, average age was 38.5 years old. Adopted the right lateral, left approach, resection of the left eleventh rib, subtotal resection body bone graft and internal fixation of T12, or L1, L2 vertebral, in which 5 cases of T12,12 cases of L1 , 13 cases of L2, all cases were given short segment fixation separated by a vertebral body, the bleeding complications during operation time and the postoperative follow-up were comparative analyzed, bone graft fusion condition was observation. Results The average operation time was (1.8±1.3) h, the average amount of bleeding during operation was800mL(400-2100mL) , 5 cases of patients got the thoracic and abdominal injury during operation, 3 cases of thoracic drainage after operation, no damage and visceral organs of major vascular injury, and no spinal cord injury aggravated cases. The time of follow-up was 6-46 months, average time was 20 months. All cases got satisfactory reduction, there were no loss of reduction during the follow-up period, fixed position was good, no loosening or fracture, both achieved bony fusion in 5 months, the fusion rate was 100%. Conclusion For the thoracolumbar(T12-L2) vertebral burst fractures, spinal cord compression mainly from anterior spinal anterior approach, familiar with local anatomy, master the techniques of using anterior, anterior approach for subtotal resection of vertebral body bone graft and

  19. Avaliação da redução por ligamentotaxia nas fraturas toracolombares tipo explosão Evaluación de la reducción por ligamentotaxia en las fracturas toracolumbares tipo explosión Evaluation of the reduction by ligamentotaxis in thoracolumbar burst fractures

    Directory of Open Access Journals (Sweden)

    Márcio Beckhauser da Silva

    2010-06-01

    ía posterior permite, al realizar ligamentotaxia, la restauración de la altura del cuerpo vertebral fracturado, del alineamiento sagital de la columna y descompresión del canal espinal minimizando la comorbidad en relación a la cirugía por vía anterior y la laminectomía para descompresión del canal.OBJECTIVE: to evaluate the correction of kyphosis, of the vertebral body height and the reduction of the retropulsed fragments in the thoracolumbar burst fractures by means of ligamentotaxis. METHODS: retrospective study evaluating a total of 238 patients with thoracolumbar A3 burst fractures based on the classification by Magerl et al., of which 63 were eligible to the research. All patients had been treated with pedicular internal fixation and had previous and postoperative radiographs and computed tomographic images. RESULTS: the study evidenced an immediate postoperative correction of vertebral kyphosis in the fracture site in 87% of the cases, with correction of 51% in the vertebral body height and reduction of 40% the intra-canal retropulsed fragments. CONCLUSIONS: the use of internal fixation by anterior approach allows, through ligamentotaxis, the restoration of the height of the vertebral body fracture, of the sagittal alignment of the column and spinal canal decompression, thus minimizing the comorbidities in relation to the surgery by anterior approach and laminectomy to canal decompression.

  20. The Analysis on Complications of Anterior Surgery for 28 Cases of Thoracolumbar Spine Burst Fracture%胸腰椎爆裂骨折28例前路手术并发症分析

    Institute of Scientific and Technical Information of China (English)

    张广平; 舒钧

    2011-01-01

    Objective To choose the right surgical treatment of thoracolumbar burst fracture, reduce complications and get the best spinal cord rehabiltion and spinal stability. Methods 28 cases of thoracolumbar burst fractures were selected in this study. preoperative X-ray examination, CT examination, and plain CT scanning were performed before anterior sugery for thoracolumbar spine. X-ray examination and CT examination were performed to observe the fixed and decompression effects 1, 2, 3, 6 months and 1 year after surgery.Results There was 1 case of the selected patients with retroperitoneal chylous fluid leak, 1 case of incisional hernia, and 1 case of pneumothorax. After active treatment, all patients were cured. Conclusions The incidence of complications of anterior sugery for thoracolumbar spine are related with the familiarity to the anatomy of thoracolumbar spine, the surgical operation skills, and experiences of the operators. Timely and effective symptomatic treatment can reduce the damage of complications to the patients.%目的 正确选择胸腰椎爆裂骨折手术治疗方法,减少并发症,以获得最佳脊髓神经恢复和脊柱稳定性.方法 胸腰椎爆裂骨折前路手术28例,术前X、CT摄片,部分行MRI平扫;术后分别1月、2月、6月、1 a摄片及部分CT检查,观察固定和减压效果.结果 1例出现乳糜液漏,1例切口疝,1例气胸.经过积极治疗,全部治愈.结论 胸腰段前路手术并发症的发生大多数和术者对该段解剖熟知程度、手术技巧和经验有关,而在发生时及时有效的进行对症治疗可将其危害降到最低.

  1. Assessment of circumferential endocardial extent of myocardial edema and infarction in patients with reperfused acute myocardial infarction: a cardiovascular magnetic resonance study.

    Science.gov (United States)

    Ota, Shingo; Tanimoto, Takashi; Hirata, Kumiko; Orii, Makoto; Shiono, Yasutsugu; Shimamura, Kunihiro; Ishibashi, Kohei; Yamano, Takashi; Ino, Yasushi; Kitabata, Hironori; Yamaguchi, Tomoyuki; Kubo, Takashi; Imanishi, Toshio; Akasaka, Takashi

    2014-01-01

    T2 weighted (T2W) images on cardiovascular magnetic resonance (CMR) visualizes myocardial edema, which reflects the myocardial area at risk (AAR) in reperfused acute myocardial infarction (AMI). Late gadolinium enhancement (LGE) demonstrates myocardial infarction. LGE images cover the whole left ventricle, but T2W images are obtained from a few slices of the left ventricle due to the long sequence time, so the quantification of AAR of the entire left ventricle is difficult. We hypothesize that we can quantify AAR with only LGE images if there is a strong correlation between the circumferential endocardial extent of myocardial edema and infarction. Thirty patients with first AMI were enrolled. All patients underwent successfully reperfusion therapy and CMR was performed within the first week after the event. We measured the circumferential extent of edema and infarction on short-axis views (T2 angle and LGE angle), respectively. A total of 82 short-axis slices showed transmural edema on T2W images. Corresponding LGE images were analyzed for the circumferential extent of infarction. The median [interquartile range] of T2 angle and DE angle were 147° [116°-219°] and 134° [104°-200°] in patients with LAD culprit lesion, 91° [87°-101°] and 85° [80°-90°] in LCX, and 110° [94°-123°] and 104° [89°-118°] in RCA, respectively. T2 angle was well correlated with LGE angle (r = 0.99, P infarction in reperfused AMI. Thus, T2 weighted imaging can be skipped to quantify the amount of AAR.

  2. 铝合金桁架环缝自动焊机的研制%Design and manufacture of automatic circumferential welding equipment for aluminium alloy boom

    Institute of Scientific and Technical Information of China (English)

    田松亚; 封艳

    2012-01-01

    根据铝合金桁架铝合金管材与接头环缝焊接要求,设计并制造了一台专用焊接设备.根据焊接时序要求,采用可编程控制器实现对焊接设备逻辑顺序的控制,并制定了铝合金桁架铝合金管材与接头环缝的惰性气体保护焊MIG自动焊接工艺.结果表明,该焊机自动化程度高、性能稳定、操作简便,能够满足铝桁架铝合金管材与接头环缝自动焊生产要求,同时提高了生产率.依据制定的焊接工艺,进行了焊接试验.焊接试验表明,制定的工艺所获得的铝合金桁架铝合全管材与接头对接接头,满足焊缝质量要求.%According to the requirements of aluminium alloy boom circumferential welding,this paper design and manufacture a special automatic welding equipment.In terms of weld time sequence requirement,PLC is used to implement the control of welding device logical subsequence.besides.work out the MIG automatic welding procedure of circumferential welding.The Result shows that the welding device displays high degree of automation,stable performance and convenient movement,which could satisfy production requirements of aluminium alloy boom automatic circumferential welding and improve productivity .Based on the welding procedure, welding experiment is done.The result indicates that welding procedure could reach the quality requirements of welding joint.

  3. Magnetic resonance-derived circumferential strain provides a superior and incremental assessment of improvement in contractile function in patients early after ST-segment elevation myocardial infarction

    Energy Technology Data Exchange (ETDEWEB)

    Wong, Dennis T.L.; Psaltis, Peter J. [University of Adelaide, Discipline of Medicine, Adelaide (Australia); South Australian Health and Medical Research Institute (SAHMRI), Adelaide (Australia); Monash Cardiovascular Research Centre, Department of Medicine (Monash Medical Centre)Monash University and Monash Heart, Clayton, VIC (Australia); Leong, Darryl P.; Weightman, Michael J.; Richardson, James D.; Worthley, Matthew I.; Worthley, Stephen G. [University of Adelaide, Discipline of Medicine, Adelaide (Australia); Dundon, Benjamin K.; Leung, Michael C.H.; Meredith, Ian T. [Monash Cardiovascular Research Centre, Department of Medicine (Monash Medical Centre)Monash University and Monash Heart, Clayton, VIC (Australia)

    2014-06-15

    We evaluate whether circumferential strain derived from grid-tagged CMR is a better method for assessing improvement in segmental contractile function after STEMI compared to late gadolinium enhancement (LGE). STEMI patients post primary PCI underwent baseline CMR (day 3) and follow-up (day 90). Cine, grid-tagged and LGE images were acquired. Baseline LGE infarct hyperenhancement was categorised as ≤25 %, 26-50 %, 51-75 % and >75 % hyperenhancement. The segmental baseline circumferential strain (CS) and circumferential strain rate (CSR) were calculated from grid-tagged images. Segments demonstrating an improvement in wall motion of ≥1 grade compared to baseline were regarded as having improved segmental contractile-function. Forty-five patients (aged 58 ± 12 years) and 179 infarct segments were analysed. A baseline CS cutoff of -5 % had sensitivity of 89 % and specificity of 70 % for detection of improvement in segmental-contractile-function. On receiver-operating characteristic analysis for predicting improvement in contractile function, AUC for baseline CS (0.82) compared favourably to LGE hyperenhancement (0.68), MVO (0.67) and baseline-CSR (0.74). On comparison of AUCs, baseline CS was superior to LGE hyperenhancement and MVO in predicting improvement in contractile function (P < 0.001). On multivariate-analysis, baseline CS was the independent predictor of improvement in segmental contractile function (P < 0.001). Grid-tagged CMR-derived baseline CS is a superior predictor of improvement in segmental contractile function, providing incremental value when added to LGE hyperenhancement and MVO following STEMI. (orig.)

  4. The effect of deformation on unloading compliance values of TPB specimens and throughwall circumferentially cracked straight pipes under four point bending load

    International Nuclear Information System (INIS)

    Compliance technique is one of the convenient methods to measure crack growth during fracture experiments. One correlation expressing crack size as a function of unloading compliance is the prerequisite of this technique. Conventionally, compliance correlation is derived by generating compliance VI crack length data by performing small displacement linear elastic finite element analysis. However, it does not account for the large geometric deformation that may take place during the loading of the specimen. The unloading compliance may be influenced by the increasing stiffness of the specimen because of change In basic geometry. It is, therefore, of interest to study the effect of deformation on the unloading compliance. In the present work, elastic-plastic finite element analysis is carried out on three point bend (TPB) specimens and throughwall circumferentially cracked pipes under four point bending load. In case of TPB specimens, unloading compliance correlation is available. However, this correlation does not consider the effect of deformation on the compliance. The objective of this study is, therefore to investigate whether deformation of the TPB specimen changes the unloading compliances or not and whether this change, if any, warrants any modifications in the existing compliance correlation. In case of throughwall circumferentially cracked straight pipe under four point bending load which is a common component for fracture studies, no such compliance correlation is available. Because of ovalisation of pipe cross section during deformation, compliance not only depends on current crack length, but also on current load. In the present work, elastic-plastic finite element analysis has been carried out on pipes having various diameter, thickness and circumferential throughwall crack sizes. The objective is to study how initial elastic compliance of pipe is affected by deformation of the original circular cross section. From the foregoing analyses, two

  5. Circumferential decompression via the posterior approach for the surgical treatment of multilevel thoracic ossification of the posterior longitudinal ligaments: a single institution comparative study

    Institute of Scientific and Technical Information of China (English)

    Liu Xiao; Zhu Bin; Liu Xiaoguang; Liu Zhongjun; Dang Gengting

    2014-01-01

    Background The treatment strategies for multilevel thoracic ossification of the posterior longitudinal ligaments (T-OPLL) were rarely reported.The aim of this study was to investigate the clinical outcomes and complications of circumferential decompression for multilevel T-OPLL and compare two different methods in the management of the OPLL (resection or floating).Methods Data of sequentially treated patients who received surgical treatment for thoracic spinal stenosis caused by multilevel T-OPLL from January 2005 to February 2012 were retrospectively reviewed.Based on the surgical approaches applied,the patients were divided into two groups.Group A consisted the patients who received posterior decompression and group B consisted the patients who received circumferential decompression via the posterior approach.Group B was further divided into two subgroups:subgroup 1 (the resection group) where the OPLL was completely resected and subgroup 2 (the floating group) where the OPLL was floated.Results A total of 49 patients were included in the study.Fourteen patients with single posterior decompression were included in group A and 35 patients who received circumferential decompression were included in group B.In group B,29 patients had complete resection of the ossified posterior longitudinal ligaments,while the other six underwent a flotation procedure.The follow-up data were available in 39 patients.Mean JOA scores improved from 5.4 ± 1.8 to 7.5 ± 2.8 in group A and from 3.7 ± 1.8 to 7.9 ± 2.4 in group B.The main complications included cerebrospinal fluid (CSF) leakage and postoperative neurologic deterioration (ND).Twenty-three of the 25 cases with postoperative CSF leakage achieved a complete recovery at the last follow-up and 12 of the 15 cases with ND achieved some neurological improvement at the last follow-up.Conclusions Circumferential decompression via the posterior approach is an effective surgical method for thoracic spinal stenosis caused by

  6. Minimally invasive percutaneous pedicle screws osteosynthesis for treatment of thoraco-lumbar vertebra fracture%经皮微创椎根弓螺钉内固定治疗胸腰椎压缩性骨折

    Institute of Scientific and Technical Information of China (English)

    林建新; 林建民; 徐志伟

    2014-01-01

    Objective To investigate the efficacy of minimally invasive percutaneous pedicle screw fixation on thoracic vertebral compression fractures. Methods Thirty patients with thoracic vertebral compression fractures from January 2012 to November 2014 were included in the study , the data were analyzed retrospectively. Of these 30 cases, 15 underwent surgical procedure of minimally invasive percutaneous pedicle screw fixation (observation group) and 15 were treated with open surgery of traditional posterior midline longitudinal incision approach. The operation time , blood loss, hospital stay, postoperative visual analogue scale (VAS), postoperative Cobb angle correction rate, postoperative failed back surgery syndrome (FBSS) were compared between two groups. Results In observation group, the mean operation time, blood loss, hospital stay were significantly reduced when compared with control (P<0.05). VAS at 48 h was significantly lower in observation group than in control group(P<0.05). The postoperative Cobb angle correction rate in observation group was similar to that in control. FBSS patients in control group was higher than in the observation group , but the difference was not statistically significant. Conclusion Minimally invasive percutaneous pedicle screws osteosynthesis has better surgical results than the traditional posterior midline longitudinal incision approach in treatment of thoraco-lumbar vertebra fracture.%目的:探讨经皮微创行椎弓根螺钉内固定治疗单纯胸腰椎压缩性骨折的临床疗效。方法选择2012年1月至2014年11月间我院收治的30例单纯胸腰椎压缩性骨折患者,分为对照组(n=15)和观察组(n=15)。对照组患者采用传统的以伤椎为中心的后正中纵行切口开放手术,观察组患者采用经皮微创椎弓根螺钉内固定手术。比较两组患者手术相关指标、术后48 h疼痛视觉模拟评分(VAS)、手术即期效果和远期效果、术后腰椎手术

  7. Curative Effect Analysis of Treating Thoracolumbar Vertebral Compression Fracture Through Injured Vertebra Nail%经伤椎置钉治疗胸腰椎压缩性骨折的疗效分析

    Institute of Scientific and Technical Information of China (English)

    时代; 顾德毅; 荆鑫

    2014-01-01

    目的:探究经伤椎椎弓根复位固定的对于治疗胸腰椎骨折的可行性及其临床疗效。方法根据随机数字表法将60例单椎体胸腰椎骨折患者分为30例的经伤椎椎弓根固定的6钉固定术(6钉组)和30例的单纯行跨伤椎的4钉固定术(4钉组),对所有的患者随访12~43个月,平均随访(27.65±2.42)个月,通过比较两组的手术时间、术中出血量、术后卧床时间、术后伤口引流量等从而得到围手术期指标及伤椎前后缘高度比值内固定失败率腰背痛评分改善指数及神经功能恢复情况。结果两组围手术期相关指标中术中出血量、手术时间、术后卧床时间比较,差异有统计学意义(P<0.05),4钉组过度撑开致术后螺钉松动率为13.33%,后凸加重发生率为10.00%,这是4钉组的情况,但是6钉组则不存在此情况。4钉组术后1周和术后6个月随访腰背痛评分平均改善率均低于6钉组,差异有统计学意义,但两组术后神经功能恢复情况具有较大的差异无统计学意义。结论经伤椎椎弓根置钉能更直接牢固骨折和固定复位,改善应力分布和固定的强度,比传统跨伤椎固定能更好的维持矫正效果。%Objective The feasibility and clinical curative effect of treating thoracolumbar vertebral fracture through resetting and fixing of injured vertebral pedicle are discussed in the thesis. Methods 60 patients with single-vertebral thoracolumbar fracture are divided into two groups according to the random number table method;the first group has 30 patients who are subjected to 6-nail fixation of injured vertebral pedicle fixation (6-nail group);the second group has 30 patients who are subjected to 4-nail fixa-tion of simple line-cross injured vertebra (4-nail group). The follow-up visit time of all patients is 12 to 43 months; the average time is (27.65±2.42) months. Perioperative indicators such as operation time, the amount of intraoperative blood loss

  8. Spelling Correction in Context

    OpenAIRE

    Pinot, Guillaume; Enguehard, Chantal

    2005-01-01

    International audience Spelling checkers, frequently used nowadays, do not allow to correct real-word errors. Thus, the erroneous replacement of dessert by desert is not detected. We propose in this article an algorithm based on the examination of the context of words to correct this kind of spelling errors. This algorithm uses a training on a raw corpus.

  9. 胸腰椎骨折患者术后腹胀的护理干预%Nursing intervention on postoperative abdominal distension of thoracolumbar frac-tures

    Institute of Scientific and Technical Information of China (English)

    李桂荣

    2015-01-01

    目的:探讨胸腰椎骨折患者术后腹胀的护理干预方法及效果。方法将我院收治的胸腰椎骨折患者60例随机分为观察组和对照组各30例,观察组采取综合护理干预的方法,包括护理评估、心理安慰、服药干预、饮食干预、腹部按摩、协助扩胸运动、大小便护理等;对照组仅采取骨科手术后常规护理。比较两组患者术后腹胀的发生率。结果观察组患者的腹胀发生率为23.3%,对照组患者的腹胀发生率为86.7%,观察组患者的腹胀发生率显著低于对照组,两组对比,差异具有统计学意义( P<0.05)。结论早期对患者实施综合护理干预,可显著降低患者的腹胀发生率,减轻患者的痛苦,提高其生活质量。%Objective To explore the nursing intervention and effect on postoperative abdominal distension of thoracolumbar frac-tures. Methods 60 patients with thoracolumbar fracture were randomly divided into observation and control groups, 30 cases in each group. Comprehensive nursing intervention was taken in the observation group, including nursing assessment, psychological comfort, medication in-tervention, dietary interventions, abdominal massage, assistance chest movement, feces and urine care. Conventional care after orthopaedic surgery was taken in the control group. The incidence of postoperative abdominal distension was compared between two groups. Results Inci-dence of abdominal distension was 23. 3% in observation group and was 86. 7% in control group. Incidence of abdominal distension of obser-vation group was significantly lower than that of control group (P<0. 05) . Conclusion Early comprehensive nursing intervention could sig-nificantly reduce the incidence of abdominal distension, relieve the pain of patients and improve the quality of life.

  10. 后路S-P截骨矫形椎弓根内固定治疗老年胸腰段重度椎体压缩骨折合并后凸畸形%Posterior Smith-Peterson osteotomy and transpedicle internal fixation for the treatment of se-nile thoracolumbar severe vertebral compression fracture with kyphosis

    Institute of Scientific and Technical Information of China (English)

    付青松; 王安全; 周宇; 李超; 崔红林; 吴昊

    2015-01-01

    Objective To evaluate operative method and effect of posterior Smith-Peterson osteotomy and transpedicle internal fixation for the treatment of elderly thoracolumbar severe vertebral compression fracture with kyphosis. Meth-ods 24 patients with elderly thoracolumbar severe vertebral compression fracture and kyphosis underwent operations by posterior Smith-Peterson osteotomy and transpedicle internal fixation. Results The duration of surgery was 1. 8~2.8(2.4±0.4)h;andtheintraoperativebloodlosswas240~460(320±85)ml.TheSmith-Petersonosteotomywere 1~3(1. 8 ± 0. 4). All cases were followed up for 18~42(26 ± 12. 4)months. The sagittal kyphosis Cobb angle was de-creased from 22°~48° (35. 6° ± 13. 4°) preoperatively to 5. 2°~10. 4°(8. 4° ± 2. 6°)at the last follow-up and correc-tion rate was 70. 4% ~78. 6% (76. 6% ±2. 2%) (P<0. 01). The JOA score of low lumbar pain was increased from 4~9 (6. 4 ± 2. 1)preoperatively to 20~24 (21. 6 ± 2. 8) at the last follow-up and correction rate was 73. 6% ± 4. 2%(P<0. 01). The ODI score was decreased from 32~44(37. 4 ± 5. 5)preoperatively to 8~14(11. 6 ± 2. 8) at the last follow-up and correction rate was 66. 9% ± 2. 4%(P<0. 01). Conclusions It is small operative trauma, high safe to treat elderly thoracolumbar severe vertebral compression fracture with kyphosis by posterior Smith-Peterson osteotomy and transpedicle internal fixation. The mild to moderate kyphosis can be got good corrective effect.%目的:探讨后路S-P截骨矫形椎弓根螺钉内固定治疗老年性胸腰段重度椎体压缩骨折合并后凸畸形的手术方法及疗效。方法对24例老年胸腰段重度椎体压缩骨折合并后凸畸形患者采取后路S-P截骨矫形椎弓根螺钉内固定手术治疗。结果手术时间1.8~2.8(2.4±0.4)h;术中出血量240~460(320±85)ml。 S-P截骨1~3(1.8±0.4)处。24例均获随访,时间18~42(26±12.4)个月。矢状面后凸Cobb角:术前22°~48°(35.6°±13.4

  11. Assessment of Myocardial Contractile Function Using Global and Segmental Circumferential Strain following Intracoronary Stem Cell Infusion after Myocardial Infarction: MRI Feature Tracking Feasibility Study

    International Nuclear Information System (INIS)

    Background. Magnetic resonance imaging (MRI) strain analysis is a sensitive method to assess myocardial function. Our objective was to define the feasibility of MRI circumferential strain (εcc) analysis in assessing subtle changes in myocardial function following stem cell therapy. Methods and Results. Patients in the Amorcyte Phase I trial were randomly assigned to treatment with either autologous bone-marrow-derived stem cells infused into the infarct-related artery 5 to 11 days following primary PCI or control. MRI studies were obtained at baseline, 3, and 6 months. εcc was measured in the short axis views at the base, mid and apical slices of the left ventricle (LV) for each patient (13 treatments and 10 controls). Mid-anterior LV εcc improved between baseline −18.5 ± 8.6 and 3 months −22.6 ± 7.0, P = 0.03. There were no significant changes in εcc at 3 months and 6 months compared to baseline for other segments. There was excellent intraobserver and interobserver agreement for basal and mid circumferential strain. Conclusion. MRI segmental strain analysis is feasible in assessment of regional myocardial function following cell therapy with excellent intra- and inter-observer variability's. Using this method, a modest interval change in segmental εcc was detected in treatment group

  12. Cerebral hemodynamic difference between early- and late-onset Alzheimer's disease by circumferential profile analysis with 123I-IMP brain SPECT

    International Nuclear Information System (INIS)

    We conducted investigation to determine whether early- and late-onset Alzheimer's diseases differ pathophysiologically. Five patients with the early-onset (65 years and under) of the disease and 11 with the late-onset (65 years and over) of the disease were studied by single photon emission CT (SPECT) with N-isopropyl-p-[123I]iodoamphetamine (IMP). Circumferential profile analysis (CPA) was performed to examine differences in the predominant hypoperfusion in the temporoparietal lobe, which is considered to be functionally damaged the most in Alzheimer's disease. The Xm values, calculated from gradients between the motorsensory or occipital cortices and temporoparietal cortex in the circumferential profile curve, were compared in both groups. The Xm values for patients with early- and late-onset Alzheimer's disease were 6.81±2.10 (counts/degree) and 3.28±1.58, respectively, the difference being significant. Our results suggest that functional abnormalities in the temporoparietal area severer in early- than late-onset Alzheimer's disease and that the application of CPA to IMP SPECT is useful to elucidate the pathophysiological difference between each of the disease. (author)

  13. Probabilistic quantum error correction

    CERN Document Server

    Fern, J; Fern, Jesse; Terilla, John

    2002-01-01

    There are well known necessary and sufficient conditions for a quantum code to correct a set of errors. We study weaker conditions under which a quantum code may correct errors with probabilities that may be less than one. We work with stabilizer codes and as an application study how the nine qubit code, the seven qubit code, and the five qubit code perform when there are errors on more than one qubit. As a second application, we discuss the concept of syndrome quality and use it to suggest a way that quantum error correction can be practically improved.

  14. Contrast image correction method

    Science.gov (United States)

    Schettini, Raimondo; Gasparini, Francesca; Corchs, Silvia; Marini, Fabrizio; Capra, Alessandro; Castorina, Alfio

    2010-04-01

    A method for contrast enhancement is proposed. The algorithm is based on a local and image-dependent exponential correction. The technique aims to correct images that simultaneously present overexposed and underexposed regions. To prevent halo artifacts, the bilateral filter is used as the mask of the exponential correction. Depending on the characteristics of the image (piloted by histogram analysis), an automated parameter-tuning step is introduced, followed by stretching, clipping, and saturation preserving treatments. Comparisons with other contrast enhancement techniques are presented. The Mean Opinion Score (MOS) experiment on grayscale images gives the greatest preference score for our algorithm.

  15. Strain correction in interleaved strain-encoded (SENC) cardiac MR

    Science.gov (United States)

    Motaal, Abdallah G.; Osman, Nael F.

    2010-03-01

    The strain encoding (SENC) technique directly encodes regional strain of the heart into the acquired MR images and produces two images with two different tunings so that longitudinal strain, on the short-axis view, or circumferential strain on the long-axis view, are measured. Interleaving acquisition is used to shorten the acquisition time of the two tuned images by 50%, but it suffers from errors in the strain calculations due to inter-tunings motion of the heart. In this work, we propose a method to correct for the inter-tunings motion by estimating the motion-induced shift in the spatial frequency of the encoding pattern, which depends on the strain rate. Numerical data was generated to test the proposed method and real images of human subjects were used for validation. The proposed method corrected the measured strain values so they became nearly identical to the original ones. The results show an improvement in strain calculations so as to relax the imaging constraints on spatial and temporal resolutions and improve image quality.

  16. The Reverse Thomas Position for Thoracolumbar Fracture Height Restoration: Relative Contribution of Patient Positioning in Percutaneous Balloon Kyphoplasty for Acute Vertebral Compressions

    Science.gov (United States)

    Cawley, Derek T.; Beecher, Suzanne M.; Baker, Joseph F.; McCabe, John P.

    2016-01-01

    Background Standard positioning for percutaneous balloon kyphoplasty requires placing a patient prone with supports under the iliac crests and upper thorax. The authors believe that hip hyperextension maximises pelvic anteversion creating anterior longitudinal ligamentotaxis, thus facilitating restoration of vertebral height. Methods Radiographic imaging including pre-operative, post-positioning, post balloon tamp inflation and post-operative lateral radiographs were analysed for anterior and posterior column height, wedge angle of the affected vertebra and 3-level Cobb angle in patients with recent fractures of T11-L1. Fracture dimensions of the index vertebra were expressed as percentage of the analogous dimension of the referent vertebra. Results From a total of 149 patients, a full imaging sequence was available on 21 cases of vertebral compression fractures. The described positioning technique created a mean anterior column height increase from 68.3% to 75.3% with positioning (p = 0.15), increasing to 82.3% post balloon inflation. Average Cobb and wedge angle improvement of 4.7° (p = 0.004)and 3.6° (p = 0.002) from positioning along were also recorded. Conclusion The Reverse Thomas Position is a safe and effective technique for augmenting thoracolumbar fracture height restoration in percutaneous balloon kyphoplasty. PMID:27441179

  17. Corrected Age for Preemies

    Science.gov (United States)

    ... Prenatal Baby Bathing & Skin Care Breastfeeding Crying & Colic Diapers & Clothing Feeding & Nutrition Preemie Sleep Teething & Tooth Care Toddler Preschool Gradeschool Teen Young Adult Healthy Children > Ages & Stages > Baby > Preemie > Corrected Age ...

  18. Correctness is not enough

    CERN Document Server

    Pryor, Louise

    2008-01-01

    The usual aim of spreadsheet audit is to verify correctness. There are two problems with this: first, it is often difficult to tell whether the spreadsheets in question are correct, and second, even if they are, they may still give the wrong results. These problems are explained in this paper, which presents the key criteria for judging a spreadsheet and discusses how those criteria can be achieved

  19. Nested Quantum Annealing Correction

    OpenAIRE

    Vinci, Walter; Albash, Tameem; Lidar, Daniel A.

    2015-01-01

    We present a general error-correcting scheme for quantum annealing that allows for the encoding of a logical qubit into an arbitrarily large number of physical qubits. Given any Ising model optimization problem, the encoding replaces each logical qubit by a complete graph of degree $C$, representing the distance of the error-correcting code. A subsequent minor-embedding step then implements the encoding on the underlying hardware graph of the quantum annealer. We demonstrate experimentally th...

  20. Osteotomy for severe thoracolumbar kyphosis in advanced ankylosing spondylitis:skipping two-level pedide subtraction osteotomy%跳跃式双节段经椎弓根椎体截骨治疗重度强直性脊柱炎胸腰椎后凸畸形

    Institute of Scientific and Technical Information of China (English)

    钱邦平; 邱勇; 季明亮; 王斌; 俞杨; 朱泽章; 蒋军

    2013-01-01

    Objective To explore the feasibility of single-stage skipping two-level pedicle subtraction osteotomy (PSO) for severe thoracolumbar kyphosis (Cobb > 100°) in advanced ankylosing spondylitis (AS).Methods Ten AS patients with thoracolumbar kyphosis undergoing skipping two-level PSO were retrospectively reviewed.The most frequent levels of osteotomy was L1 and L4 (n =7),followed by T12 and L3 (n =2) and 12 and L5 (n =1).All patients were males with a mean age of 28.5 ±9.1 years (range:17-47).The pre-and post-operative values of thoracic kyphosis (TK),lumbar lordosis (LL),globe kyphosis (GK),local kyphosis of osteotomized vertebra (LK1,LK2) and sagittal imbalance (SVA)were measured.Results Significant differences were observed with respects to the improvements of LL,GK,LK1,LK2 and SVA (P<0.01).LL,GK,LK1,LK2 and SVA improved fron 41.9°,113.4°,40.5°,-0.3° and 25.2 cm preoperatively to-44.1°,71.6°,13.5°,-26.8° and 5.8 cm postoperatively respectively.The mean operative duration was 370 minutes (range:290-420) and the estimated volume of blood loss 2600 ml (range:1700-3800).Dural tear occurred intra-operatively in 1 patient.One had a transient brachial plexus paralysis and resolved after 1 week postoperatively.One had transient raiculopathy in right lower extremity and recovered completely 3 weeks postoperatively.Conclusion As a safe and effective technique for correction of severe thoracolumbar kyphosis (Cobb > 100°) secondary to AS,single-stage skipping two-level PSO osteotomy can achieve larger correction and better sagittal alignment with a mean correction of 86°in terms of LL.%目的 探讨一期跳跃式双节段经椎弓根椎体截骨术(PSO)治疗重度(Cobb> 100°)强直性脊柱炎(AS)胸腰椎后凸畸形的可行性.方法 回顾性分析2007年7月至2009年7月行跳跃式双节段PSO矫形内固定术的10例AS胸腰椎后凸畸形患者,截骨节段分布为L1、M(7例),T12、L3(2例),L2、L5(1例),患者均为男性,年龄17 ~47

  1. Circumferential lesion formation around the pulmonary veins in the left atrium with focused ultrasound using a 2D-array endoesophageal device: a numerical study

    Energy Technology Data Exchange (ETDEWEB)

    Pichardo, Samuel; Hynynen, Kullervo [Imaging Research-Sunnybrook Health Sciences Centre, 2075 Bayview Avenue, Room C713, Toronto, ON M4N 3M5 (Canada)

    2007-08-21

    Atrial fibrillation (AF) is the most frequently sustained cardiac arrhythmia affecting humans. The electrical isolation by ablation of the pulmonary veins (PVs) in the left atrium (LA) of the heart has been proven as an effective cure of AF. The ablation consists mainly in the formation of a localized circumferential thermal coagulation of the cardiac tissue surrounding the PVs. In the present numerical study, the feasibility of producing the required circumferential lesion with an endoesophageal ultrasound probe is investigated. The probe operates at 1 MHz and consists of a 2D array with enough elements (114 x 20) to steer the acoustic field electronically in a volume comparable to the LA. Realistic anatomical conditions of the thorax were considered from the segmentation of histological images of the thorax. The cardiac muscle and the blood-filled cavities in the heart were identified and considered in the sound propagation and thermal models. The influence of different conditions of the thermal sinking in the LA chamber was also studied. The circumferential ablation of the PVs was achieved by the sum of individual lesions induced with the proposed device. Different scenarios of lesion formation were considered where ultrasound exposures (1, 2, 5 and 10 s) were combined with maximal peak temperatures (60, 70 and 80 {sup 0}C). The results of this numerical study allowed identifying the limits and best conditions for controlled lesion formation in the LA using the proposed device. A controlled situation for the lesion formation surrounding the PVs was obtained when the targets were located within a distance from the device in the range of 26 {+-} 7 mm. When combined with a maximal temperature of 70 {sup 0}C and an exposure time between 5 and 10 s, this distance ensured preservation of the esophageal structures, controlled lesion formation and delivery of an acoustic intensity at the transducer surface that is compatible with existing materials. With a peak

  2. MRI interrReader and intra-reader reliabilities for assessing injury morphology and posterior ligamentous complex integrity of the spine according to the thoracolumbar injury classification system and severity score

    Energy Technology Data Exchange (ETDEWEB)

    Lee, Guen Young; Lee, Joon Woo; Choi, Seung Woo; Lim, Hyun Jin; Sun, Hye Young; Kang, Yu Suhn; Kang, Heung Sik [Dept. of Radiology, Seoul National University Bundang Hospital, Seongnam (Korea, Republic of); Chai, Jee Won; Kim, Su Jin [Dept. of Radiology, SMG-SNU Boramae Medical Center, Seoul (Korea, Republic of)

    2015-08-15

    To evaluate spine magnetic resonance imaging (MRI) inter-reader and intra-reader reliabilities using the thoracolumbar injury classification system and severity score (TLICS) and to analyze the effects of reader experience on reliability and the possible reasons for discordant interpretations. Six radiologists (two senior, two junior radiologists, and two residents) independently scored 100 MRI examinations of thoracolumbar spine injuries to assess injury morphology and posterior ligamentous complex (PLC) integrity according to the TLICS. Inter-reader and intra-reader agreements were determined and analyzed according to the number of years of radiologist experience. Inter-reader agreement between the six readers was moderate (k = 0.538 for the first and 0.537 for the second review) for injury morphology and fair to moderate (k = 0.440 for the first and 0.389 for the second review) for PLC integrity. No significant difference in inter-reader agreement was observed according to the number of years of radiologist experience. Intra-reader agreements showed a wide range (k = 0.538-0.822 for injury morphology and 0.423-0.616 for PLC integrity). Agreement was achieved in 44 for the first and 45 for the second review about injury morphology, as well as in 41 for the first and 38 for the second review of PLC integrity. A positive correlation was detected between injury morphology score and PLC integrity. The reliability of MRI for assessing thoracolumbar spinal injuries according to the TLICS was moderate for injury morphology and fair to moderate for PLC integrity, which may not be influenced by radiologist' experience.

  3. Braden评分法在预防胸腰椎骨折并发压疮患者中的应用%Application of Braden scoring method in the prevention of bedsore in the patients with thoracolumbar fractures

    Institute of Scientific and Technical Information of China (English)

    张敏

    2012-01-01

    Objective: To explore the effect of nursing intervention in the light of Braden scoring method in the prevention of bedsore in patients with thoracolumbar fractures . Methods: 138 patients with thoracolumbar fractures were randomly divided into a control group ( n= 65) and an experimental group (n =73) in order of admission. The conventional grading nursing method was implemented in the control group and Braden scoring method was used to predict the potential risk of bedsore in the patients with thoracolumbar fractures in the exper -imental group, and then the grading nursing care was given to the patients according to the scores of potential risk . Results: Bedsore occurred in one patient in the experimental group and 6 patients in the control group ,the difference was statistically significant between the two groups (P <0.05). Conclusion:The early warning nursing intervention by following Braden scoring method can effectively reduce the incidence of bedsore in the patients with thoracolumbar fractures .%目的:探讨Braden评分法护理干预对预防胸腰椎骨折患者压疮发生的疗效.方法:将138例胸腰椎骨折患者按入院先后顺序随机分为对照组65例和实验组73例,对照组采用传统分级护理方法护理,实验组应用Braden评分法预测胸腰椎骨折卧床患者压疮发生的潜在危险度,根据分值进行分级护理.结果:实验组发生压疮1例,对照组发生压疮6例,两组比较差异有统计学意义(P<0.05).结论:采用Braden评分法预警干预护理能有效降低胸腰椎骨折卧床患者压疮的发生率.

  4. Is crack branching under shear loading caused by shear fracture? ——A critical review on maximum circumferential stress theory

    Institute of Scientific and Technical Information of China (English)

    孙宗颀

    2001-01-01

    When a crack is subjected to shear force, crack branching usually occurs. Theoretical study shows that the crack branching under shear loading is caused by tensile stress, but not caused by shear fracture. The co-plane shear fracture could be obtained if compressive stress with given direction is applied to the specimen, subsequently, calculated shear fracture toughness, KⅡ C, is larger than KⅠ C. A prerequisite of possible occurrence of mode Ⅱ fracture was proposed. The study of shear fracture shows that the maximum circumferential stress theory considered its criterion as a parametric equation of a curve in KⅠ, KⅡ plane is incorrect; the predicted ratio KⅡ C/KⅠ C=0.866 is incorrect too.

  5. Application of fracture-proof design methods using tearing-instability theory to nuclear piping postulating circumferential through-wall cracks

    International Nuclear Information System (INIS)

    This report presents methods of applying tearing instability analysis to large circumferential through-wall cracks in piping to demonstrate cases of adequate ductility to avoid double ended break. The first part gives results of applying simplified rigid-plastic cracked section analysis to some typical piping systems and subsequently gives some additional refinements of this type of analysis. The second part presents full elastic-plastic cracked section analysis which demonstrates the adequacy of rigid-plastic analysis for most cases and provides the methodology where elastic-plastic analysis is required. The results combined with adequate treatment of material property data and other deformation limiting and load limiting aspects of as-built piping systems, provides a complete analysis of subject

  6. A method for the measurement of dispersion curves of circumferential guided waves radiating from curved shells: experimental validation and application to a femoral neck mimicking phantom

    Science.gov (United States)

    Nauleau, Pierre; Minonzio, Jean-Gabriel; Chekroun, Mathieu; Cassereau, Didier; Laugier, Pascal; Prada, Claire; Grimal, Quentin

    2016-07-01

    Our long-term goal is to develop an ultrasonic method to characterize the thickness, stiffness and porosity of the cortical shell of the femoral neck, which could enhance hip fracture risk prediction. To this purpose, we proposed to adapt a technique based on the measurement of guided waves. We previously evidenced the feasibility of measuring circumferential guided waves in a bone-mimicking phantom of a circular cross-section of even thickness. The goal of this study is to investigate the impact of the complex geometry of the femoral neck on the measurement of guided waves. Two phantoms of an elliptical cross-section and one phantom of a realistic cross-section were investigated. A 128-element array was used to record the inter-element response matrix of these waveguides. This experiment was simulated using a custom-made hybrid code. The response matrices were analyzed using a technique based on the physics of wave propagation. This method yields portions of dispersion curves of the waveguides which were compared to reference dispersion curves. For the elliptical phantoms, three portions of dispersion curves were determined with a good agreement between experiment, simulation and theory. The method was thus validated. The characteristic dimensions of the shell were found to influence the identification of the circumferential wave signals. The method was then applied to the signals backscattered by the superior half of constant thickness of the realistic phantom. A cut-off frequency and some portions of modes were measured, with a good agreement with the theoretical curves of a plate waveguide. We also observed that the method cannot be applied directly to the signals backscattered by the lower half of varying thicknesses of the phantom. The proposed approach could then be considered to evaluate the properties of the superior part of the femoral neck, which is known to be a clinically relevant site.

  7. 环形大腿吸脂术150例体会%A clinical analysis of circumferential thigh liposuction: 150 cases report

    Institute of Scientific and Technical Information of China (English)

    黎石峰; 李俊明; 张昕霞; 江华; 李琳

    2013-01-01

    目的 探讨一种安全有效的大腿吸脂塑形的方法.方法 自2008年4月至2012年5月,采用持续硬膜外麻醉+肿胀麻醉下行360°环形吸脂术,对150例求美者大腿进行吸脂塑形.结果 本组求美者150例,术中麻醉效果好,出血少,术后随访3~9个月,吸脂塑形效果好,并发症少.结论 持续硬膜外麻醉+肿胀麻醉下行360°环形大腿吸脂术是一种安全、有效的方法,值得临床推广.%Objective To explore a safe and effective liposuction method for the thigh lipostructure.Methods From April 2008 to May 2012,circumferential bilateral thigh liposuction under continuous epidural anesthesia combined with local tumescent anesthesia was performed on 150 cases.Results Satisfactory results were received with good intraoperative anesthetic effect and less bleeding.After 3 to 9 months follow-up,satisfied thigh contour was obtained in all cases with few postoperative complications.Conclusion Circumferential thigh liposuction under continuous epidural anesthesia combined with local tumescent anesthesia is a safe and efficacy approach for thigh lipostructure.

  8. 基于PLC的钢管环缝焊接性能研究%Performance of circumferential welding for steel tube based on PLC

    Institute of Scientific and Technical Information of China (English)

    陈怀忠; 许雪贵; 黄芳

    2014-01-01

    PLC technique was applied for controlling the CO2 gas shielded welding process of circumferential welding for 20MnCr steel tube. The corrosion resistance,thermal fatigue resistance,tensile and impact properties were tested and analyzed. The results show that compared with the common control method,the PLC control technique can obtain better corrosion resistance, thermal fatigue resistance,tensile and impact properties of welding joint. After neutral salt-spray corrosion for 240 h,the mass loss rate of circumferential welding joint by PLC technique decreases by 65%,tensile strength at 20℃increases by 15%,and impact energy at 20℃increases by 26%.%在20MnCr钢管环缝CO2气体保护焊控制过程中引入PLC技术,进行焊接接头耐腐蚀性能、抗热疲劳性能、拉伸和冲击性能的测试与对比分析。结果表明:与传统控制技术相比,采用PLC技术获得的焊接接头具有更优的耐腐蚀性能、抗热疲劳性能、拉伸和冲击性能;经过240 h中性盐雾腐蚀后质量损失率降低了65%;20℃抗拉强度增加15%、冲击吸收功增加26%。

  9. A method for the measurement of dispersion curves of circumferential guided waves radiating from curved shells: experimental validation and application to a femoral neck mimicking phantom.

    Science.gov (United States)

    Nauleau, Pierre; Minonzio, Jean-Gabriel; Chekroun, Mathieu; Cassereau, Didier; Laugier, Pascal; Prada, Claire; Grimal, Quentin

    2016-07-01

    Our long-term goal is to develop an ultrasonic method to characterize the thickness, stiffness and porosity of the cortical shell of the femoral neck, which could enhance hip fracture risk prediction. To this purpose, we proposed to adapt a technique based on the measurement of guided waves. We previously evidenced the feasibility of measuring circumferential guided waves in a bone-mimicking phantom of a circular cross-section of even thickness. The goal of this study is to investigate the impact of the complex geometry of the femoral neck on the measurement of guided waves. Two phantoms of an elliptical cross-section and one phantom of a realistic cross-section were investigated. A 128-element array was used to record the inter-element response matrix of these waveguides. This experiment was simulated using a custom-made hybrid code. The response matrices were analyzed using a technique based on the physics of wave propagation. This method yields portions of dispersion curves of the waveguides which were compared to reference dispersion curves. For the elliptical phantoms, three portions of dispersion curves were determined with a good agreement between experiment, simulation and theory. The method was thus validated. The characteristic dimensions of the shell were found to influence the identification of the circumferential wave signals. The method was then applied to the signals backscattered by the superior half of constant thickness of the realistic phantom. A cut-off frequency and some portions of modes were measured, with a good agreement with the theoretical curves of a plate waveguide. We also observed that the method cannot be applied directly to the signals backscattered by the lower half of varying thicknesses of the phantom. The proposed approach could then be considered to evaluate the properties of the superior part of the femoral neck, which is known to be a clinically relevant site. PMID:27272197

  10. Bone Cement Augmentation of Pedicle Screw Fixation Combined with Kyphoplasty for Osteoporotic Thoracolumbar Burst Fractures%骨水泥强化椎弓根螺钉固定结合椎体后凸成形术治疗骨质疏松性胸腰段爆裂骨折

    Institute of Scientific and Technical Information of China (English)

    于亮; 蒋伟宇; 赵刘军; 马维虎; 徐荣明

    2014-01-01

    (16.7±3.2)%, respectively, after 1-year fol ow-up, front and back edges of vertebral compression rates were (9.1 ±1.3)%and (1.2± 0.9)%, the correction of Cobb’s angle from (25.7±4.5)° to (3.3±2.1)°, the average correction angle was 19.8°; and VAS score decreased from (7.2±0.5) to (1.9 ±0.6). There were significantly statistical differences( P<0.05) in al indexes between pre-operation and post-operation. [Conclusion] Bone cement augmentation of pedicle screw fixation combined with kyphoplasty for osteoporotic thoracolumbar burst fractures, can effectively restore spinal sagittal alignment, maintain the height and strength for injured vertebral, avoid vertebral col apse and reduce complications.

  11. Renormalons and Power Corrections

    CERN Document Server

    Beneke, Martin

    2000-01-01

    Even for short-distance dominated observables the QCD perturbation expansion is never complete. The divergence of the expansion through infrared renormalons provides formal evidence of this fact. In this article we review how this apparent failure can be turned into a useful tool to investigate power corrections to hard processes in QCD.

  12. ERRORS AND CORRECTION

    Institute of Scientific and Technical Information of China (English)

    1998-01-01

    To err is human . Since the 1960s, most second language teachers or language theorists have regarded errors as natural and inevitable in the language learning process . Instead of regarding them as terrible and disappointing, teachers have come to realize their value. This paper will consider these values, analyze some errors and propose some effective correction techniques.

  13. Text Induced Spelling Correction

    NARCIS (Netherlands)

    Reynaert, M.W.C.

    2004-01-01

    We present TISC, a language-independent and context-sensitive spelling checking and correction system designed to facilitate the automatic removal of non-word spelling errors in large corpora. Its lexicon is derived from a very large corpus of raw text, without supervision, and contains word unigram

  14. Model Correction Factor Method

    DEFF Research Database (Denmark)

    Christensen, Claus; Randrup-Thomsen, Søren; Morsing Johannesen, Johannes

    1997-01-01

    of the model correction factor method, is that in simpler form not using gradient information on the original limit state function or only using this information once, a drastic reduction of the number of limit state evaluation is obtained together with good approximations on the reliability. Methods...

  15. Writing: Revisions and Corrections

    Science.gov (United States)

    Kohl, Herb

    1978-01-01

    A fifth grader wanted to know what he had to do to get all his ideas the way he wanted them in his story writing "and" have the spelling, punctuation and quotation marks correctly styled. His teacher encouraged him to think about writing as a process and provided the student with three steps as guidelines for effective writing. (Author/RK)

  16. 75 FR 68409 - Correction

    Science.gov (United States)

    2010-11-08

    ... Documents#0;#0; ] Presidential Determination No. 2010-14 of September 3, 2010--Unexpected Urgent Refugee And Migration Needs Resulting From Flooding In Pakistan Correction In Presidential document 2010-27673 beginning..., the Presidential Determination number should read ``2010-14'' (Presidential Sig.) [FR Doc....

  17. 胸腰椎单纯性屈曲性压缩性骨折的护理%explore the treatment and care of thoracolumbar vertebral fracture

    Institute of Scientific and Technical Information of China (English)

    陈帆; 魏清; 蒋礼

    2013-01-01

    Objective:To explore the treatment and care of thoracolumbar vertebral fracture, body movement and the complications of the lower. Methods: A retrospective analysis was made on the clinical data of 47 cases of compression fractures of thoracic and lumbar spine simple sex from October, 1996 to August, 2012 in our hospital. Results: Through the careful treatment, decubitus care and prevention and treatment of complications, 47 patients of this group all got better;through the follow-up visits from half a year to 16 years, 47 patients of this group all recovered. Conclusion:Through the close observation of vital signs, limb function exercise and lumbar muscle exercise, 47 patients of this group have smoothly recovered.%  目的:探讨胸腰椎骨折治疗和护理,肢体运动,降低并发症。方法:回顾分析我院1996年10月~2012年8月47例胸腰椎单纯性屈曲性压缩性骨折的临床资料。结果:本组47例病经精心治疗、及卧姿护理,防治并发症均好转,经随访半年~16年47例均痊愈。结论:经密切观察生命体征,肢体功能运动及腰椎肌锻炼,均能顺利康复。

  18. CLINICAL SIGNIFICANCE OF POSTERIOR INTERNAL FIXATION FOR REGULATION OF SPINAL CURVATURE IN THORACOLUMBAR COMPRESSION FRACTURES%胸腰椎压缩骨折复位术中伤椎植钉曲度矫正的临床意义

    Institute of Scientific and Technical Information of China (English)

    李鹏飞; 房根强; 李华; 靳宪辉; 张庆胜; 丁文元; 张为; 崔胜杰

    2013-01-01

    Objective To investigate the clinical significance of applicating posterior internal fixation for regulating spinal curvature in thoracolumbar compression fractures. Methods Between May 2006 and May 2009, 63 patients with thoracolumbar compression fractures were treated, and the clinical data were retrospectively analyzed. Among them, 33 patients received traditional posterior internal fixation in control group; 30 patients underwent posterior internal fixation with spinal curvature correction under C-arm X-ray device in trial group. There was no significant difference in age, gender, cause of injury, injured segment, grade of fracture, and time from injury to operation between 2 groups (P > 0.05). The Cobb angle, height of injured vertebral body, and disc height were measured by X-ray examination; loosening and breakage of internal fixation were observed and compared between 2 groups. The recovery rate was calculated according to pre- and post-operative visual analogue scale (VAS) and Oswestry disability index (ODI) scores for each patient. Results All cases were followed up 20-45 months (mean, 31 months). The postoperative VAS score, ODI, Cobb angle, height of injured vertebral body, and disc height were improved significantly when compared with preoperative values in 2 groups (P < 0.05). At last follow-up, VAS and ODI scores of trial group were significantly better than those of control group (P < 0.05); loss of Cobb angle was (2.1 ± 1.7)° in trial group and (4.2 ± 3.2)° in control group, showing significant difference (t=1.457, P=0.000); loss of disc height was (1.4 ± 1.2) mm in trial group and (3.4 ± 2.3) mm in control group, showing significant difference ((=9.336, P= 0.000); loss of height of injured vertebral body was 1.8% ± 0.6% in trial group and 5.4% + 2.1% in control group, showing significant difference (t=3.435, P=0.000). Broken screw and loosening screw occurred in 1 case of control group, respectively (6.1%), but no broken or loosening screw

  19. CTI Correction Code

    Science.gov (United States)

    Massey, Richard; Stoughton, Chris; Leauthaud, Alexie; Rhodes, Jason; Koekemoer, Anton; Ellis, Richard; Shaghoulian, Edgar

    2013-07-01

    Charge Transfer Inefficiency (CTI) due to radiation damage above the Earth's atmosphere creates spurious trailing in images from Charge-Coupled Device (CCD) imaging detectors. Radiation damage also creates unrelated warm pixels, which can be used to measure CTI. This code provides pixel-based correction for CTI and has proven effective in Hubble Space Telescope Advanced Camera for Surveys raw images, successfully reducing the CTI trails by a factor of ~30 everywhere in the CCD and at all flux levels. The core is written in java for speed, and a front-end user interface is provided in IDL. The code operates on raw data by returning individual electrons to pixels from which they were unintentionally dragged during readout. Correction takes about 25 minutes per ACS exposure, but is trivially parallelisable to multiple processors.

  20. Correction coil cable

    Science.gov (United States)

    Wang, Sou-Tien

    1994-11-01

    A wire cable assembly (10, 310) adapted for the winding of electrical coils is taught. A primary intended use is for use in particle tube assemblies (532) for the superconducting super collider. The correction coil cables (10, 310) have wires (14, 314) collected in wire arrays (12, 312) with a center rib (16, 316) sandwiched therebetween to form a core assembly (18, 318 ). The core assembly (18, 318) is surrounded by an assembly housing (20, 320) having an inner spiral wrap (22, 322) and a counter wound outer spiral wrap (24, 324). An alternate embodiment (410) of the invention is rolled into a keystoned shape to improve radial alignment of the correction coil cable (410) on a particle tube (733) in a particle tube assembly (732).

  1. Aberration Corrected Emittance Exchange

    CERN Document Server

    Nanni, Emilio A

    2015-01-01

    Full exploitation of emittance exchange (EEX) requires aberration-free performance of a complex imaging system including active radio-frequency (RF) elements which can add temporal distortions. We investigate the performance of an EEX line where the exchange occurs between two dimensions with normalized emittances which differ by orders of magnitude. The transverse emittance is exchanged into the longitudinal dimension using a double dog-leg emittance exchange setup with a 5 cell RF deflector cavity. Aberration correction is performed on the four most dominant aberrations. These include temporal aberrations that are corrected with higher order magnetic optical elements located where longitudinal and transverse emittance are coupled. We demonstrate aberration-free performance of emittances differing by 4 orders of magnitude, i.e. an initial transverse emittance of $\\epsilon_x=1$ pm-rad is exchanged with a longitudinal emittance of $\\epsilon_z=10$ nm-rad.

  2. Radiative corrections to DIS

    CERN Document Server

    Krasny, Mieczyslaw Witold

    2008-01-01

    Early deep inelastic scattering (DIS) experiments at SLAC discovered partons, identified them as quarks and gluons, and restricted the set of the candidate theories for strong interactions to those exhibiting the asymptotic freedom property. The next generation DIS experiments at FNAL and CERN confirmed the predictions of QCD for the size of the scaling violation effects in the nucleon structure functions. The QCD fits to their data resulted in determining the momentum distributions of the point-like constituents of nucleons. Interpretation of data coming from all these experiments and, in the case of the SLAC experiments, even an elaboration of the running strategies, would not have been possible without a precise understanding of the electromagnetic radiative corrections. In this note I recollect the important milestones, achieved in the period preceding the HERA era, in the high precision calculations of the radiative corrections to DIS, and in the development of the methods of their experimental control. ...

  3. Biomechanical properties of monosegmental pedicle screw fixation via the fractured thoracolumbar vertebrae%经胸腰段伤椎单节段椎弓根螺钉固定后的生物力学特性

    Institute of Scientific and Technical Information of China (English)

    刘上楼; 徐军; 倪卓民; 张云庆; 周枫; 姜雪峰

    2013-01-01

    背景:临床常采用经伤椎椎弓根螺钉内固定治疗胸腰椎骨折,研究已证实经伤椎双侧椎弓根螺钉固定后脊柱稳定性加强,但也有研究认为经伤椎单节段椎弓根螺钉固定足以增加脊柱的稳定性,但此结论缺乏生物力学结果支持。  目的:观察胸腰段椎体骨折经伤椎单节段固定的相关生物力学特性。  方法:取扬州大学医学院解剖教研室提供8具中国人新鲜胸腰段标本(T11-L3),锯条横断2/3椎体,制成完整胸腰段椎体实验标本,将8具标本等分成跨伤椎固定组和单节段经伤椎固定组,分别在跨伤椎临近椎体四钉固定和临近椎体四钉固定+经伤椎单侧椎弓根固定。  结果与结论:胸腰段椎体骨折后经跨伤椎固定与经单节段伤椎固定的载荷-应变关系相差12%、载荷-位移关系相差11%、强度相差18%、轴向刚度相差11%、扭转力相差11%及拔出力相差1.8%,两组差异有显著性意义(P OBJECTIVE:To evaluate the biomechanical properties of monosegmental pedicle screws fixation via fractured vertebrae for thoracolumbar fracture. METHODS:Eight cadavers’ thoracolumbar specimens (T11-L3) were provided by the Department of Anatomy, Yangzhou University School of Medicine. Saw was used to transect 2/3 of the vertebrae in order to make complete experimental thoracolumbar specimens. Eight specimens were divided into two group;beyond-fractured vertebrae fixation group and monosegmental fixation via fracture vertebrae group. The specimens in the two groups were treated with adjacent vertebral four screw fixation beyond fractured vertebrae and adjacent vertebral four screw fixation+monosegmental pedicle screw fixation via fractured vertebrae respectively. RESULTS AND CONCLUSION:After thoracolumbar fracture, the differences between beyond fractured vertebrae fixation and monosegmental pedicle screw fixation via fractured vertebrae were as fol ows

  4. Different internal fixation treatment of thoracolumbar spinal tuberculosis:comparision of kyphosis Cobb angle and spinal stability%不同植入物内固定修复胸腰段脊柱结核:后凸Cobb角及脊柱稳定性比较

    Institute of Scientific and Technical Information of China (English)

    邢文华; 霍洪军; 肖宇龙; 杨学军; 赵岩; 付裕; 祝勇; 李峰; 辛大奇

    2015-01-01

    mild and moderate spinal kyphosis deformity. Surgical treatment of spinal tuberculosis has been frequently reported in recent years, the commonly used treatment includes lesion clearance, bone graft fusion and internal fixation. OBJECTIVE:To investigate the principle of choosing different internal fixation treatment for thoracolumbar spinal tuberculosis. METHODS:42 patients with thoracolumbar spinal tuberculosis were involved in this study from January 2001 to December 2011. Al patients suffered from waist and back pains, with the disease course range of 1 month to 7 years. Four cases showed neurological deficit before surgery. According to the Frankel classification, 1 case was graded as Frankel C and 3 cases as Frankel D. The preoperative average Cobb angle of kyphosis was 27° (range 12°-45°). The internal fixation approaches were chosen according to the tuberculose focus and vertebral fracture extent. Thoraco-abdominal approach for thoracolumbar spine via diaphragm with the removal of 11 rib and(or) 12 rib was performed for al patients. Among these protocols, 25 cases underwent anterior focal debridement and bone grafting. 17 cases had anterior focal debridement and posterior pedicle screw internal fixation (one-stage surgery in 7 cases and second-stage surgery in 10 cases). Al patients received anti-tuberculosis chemotherapy before and after operation. 36 cases used rib and 6 cases used iliac bone as bone graft. Al patients were fol owed up from 17 months to 9 years. The correction of spinal deformity, spinal stability and spinal functional recovery were observed. RESULTS AND CONCLUSION:30 patients were fol owed up after operations and the back pains disappeared. X-ray examination showed that, al patients were fixed wel without no loosening and rupture, and achieved bony fusion (the mean time were 5.4 months). No tuberculosis recurred. Four cases complicated with spinal cord injury were E grade according to the Frankel classification. The Cobb angle was 0-26

  5. PKP结合颈腰痛Ⅱ号方治疗老年骨质疏松性胸腰椎压缩性骨折临床疗效观察%Clinical Study of PKP in Combination with the Prescription of Jingyaotong Ⅱ in Treating Thoracolumbar Compressed Fractures in Aged Patients with Osteoprosis

    Institute of Scientific and Technical Information of China (English)

    修忠标; 邱元洲; 陈晓东

    2012-01-01

    statistically significant compared preoperation with postoperation about percentage of anterior vertebral height loss, two groups weren't statistically significant after 3 days and 6 months, and statistically significant after 12 months; the differences of A group and B group were statistically significant compared preoperation with postoperation about percentage of middle vertebral height loss, two groups were statistically significant after 3 days and 6 months and 12 months; the differences of A group and B group were statistically significant compared preoperation with postoperation about Cobb's angle, two groups weren't statistically significant after 3 days and 6 months, that was statistically significant after 12 months. A year After treatment of two groups, the total effective rates of two groups were statistically significant. Conclusion : PKP can efficently relieve back pain of the wounded, restore the vertebral height and correct the kyphosis in the treatment of thoracolumbar compressed fractures in aged patients with osteoprosis. But long-term follow-up result illustrates that PKP cannot maintain anterior vertebral height and Cobb's angle. Prescription of Jingyaotong Ⅱ can enhance the analgesic effect of PKP, and reduce vertebral height loss.%目的:探讨经皮椎体后凸成形术(PKP)结合颈腰痛Ⅱ号方治疗老年骨质疏松性胸腰椎压缩性骨折的临床疗效.方法:2008年12月-2010年12月老年骨质疏松性椎体压缩性骨折住院患者89例,对纳入病例行中医辨证,选择肾虚血瘀型患者,术前均有腰背部疼痛、局部疼痛如刺、痛处不移、不能持重.采用随机数字表法分成两组,A组46例患者,其中男14例,女32例,年龄60~88岁,平均70.7岁;B组43例患者,其中男12例,女31例,年龄60~88岁,平均70.9岁.所有患者术前均行X线片、CT扫描、MRI检查及相关体格检查,排除其他原因引起的胸腰椎压缩性骨折,无脊髓和神经根受损,椎体后壁完整.A组

  6. Circumferential or sectored beam arrangements for stereotactic body radiation therapy (SBRT) of primary lung tumors: Effect on target and normal-structure dose-volume metrics

    Energy Technology Data Exchange (ETDEWEB)

    Rosenberg, Mara W. [Broad Institute of MIT and Harvard, Cambridge, MA (United States); Department of Physics, Brandeis University, Waltham, MA (United States); Kato, Catherine M. [Macalester College, St. Paul, MN (United States); Carson, Kelly M.P. [The University of North Carolina, Chapel Hill, NC (United States); Matsunaga, Nathan M. [Santa Clara University, Santa Clara, CA (United States); Arao, Robert F. [Department of Public Health and Preventive Medicine, Oregon Health and Science University, Portland, OR (United States); Doss, Emily J. [Department of Internal Medicine, Providence St. Vincent Medical Center, Portland, OR (United States); McCracken, Charles L. [Department of Radiation Medicine, Oregon Health and Science University, Portland, OR (United States); Meng, Lu Z. [Department of Radiation Oncology, University of California Davis Comprehensive Cancer Center, Sacramento, CA (United States); Chen, Yiyi [Department of Public Health and Preventive Medicine, Oregon Health and Science University, Portland, OR (United States); Laub, Wolfram U.; Fuss, Martin [Department of Radiation Medicine, Oregon Health and Science University, Portland, OR (United States); Department of Nuclear Engineering and Radiation Health Physics, Oregon State University, Corvallis, OR (United States); Tanyi, James A., E-mail: tanyij@ohsu.edu [Department of Radiation Medicine, Oregon Health and Science University, Portland, OR (United States); Department of Nuclear Engineering and Radiation Health Physics, Oregon State University, Corvallis, OR (United States)

    2013-01-01

    To compare 2 beam arrangements, sectored (beam entry over ipsilateral hemithorax) vs circumferential (beam entry over both ipsilateral and contralateral lungs), for static-gantry intensity-modulated radiation therapy (IMRT) and volumetric-modulated arc therapy (VMAT) delivery techniques with respect to target and organs-at-risk (OAR) dose-volume metrics, as well as treatment delivery efficiency. Data from 60 consecutive patients treated using stereotactic body radiation therapy (SBRT) for primary non–small-cell lung cancer (NSCLC) formed the basis of this study. Four treatment plans were generated per data set: IMRT/VMAT plans using sectored (-s) and circumferential (-c) configurations. The prescribed dose (PD) was 60 Gy in 5 fractions to 95% of the planning target volume (PTV) (maximum PTV dose ∼ 150% PD) for a 6-MV photon beam. Plan conformality, R{sub 50} (ratio of volume circumscribed by the 50% isodose line and the PTV), and D{sub 2} {sub cm} (D{sub max} at a distance ≥2 cm beyond the PTV) were evaluated. For lungs, mean doses (mean lung dose [MLD]) and percent V{sub 30}/V{sub 20}/V{sub 10}/V{sub 5} Gy were assessed. Spinal cord and esophagus D{sub max} and D{sub 5}/D{sub 50} were computed. Chest wall (CW) D{sub max} and absolute V{sub 30}/V{sub 20}/V{sub 10}/V{sub 5} {sub Gy} were reported. Sectored SBRT planning resulted in significant decrease in contralateral MLD and V{sub 10}/V{sub 5} {sub Gy}, as well as contralateral CW D{sub max} and V{sub 10}/V{sub 5} {sub Gy} (all p < 0.001). Nominal reductions of D{sub max} and D{sub 5}/D{sub 50} for the spinal cord with sectored planning did not reach statistical significance for static-gantry IMRT, although VMAT metrics did show a statistically significant decrease (all p < 0.001). The respective measures for esophageal doses were significantly lower with sectored planning (p < 0.001). Despite comparable dose conformality, irrespective of planning configuration, R{sub 50} significantly improved with IMRT

  7. Position Effect of Circumferential Crack Defects on Elbow Pipe Bearing Capacity%周向缺陷位置对弯管承载能力的影响

    Institute of Scientific and Technical Information of China (English)

    万晋; 秦超

    2016-01-01

    Taking elbow pipe as the object of study, the finite element method was adopted to investigate axial stress distribution on the cross section of the elbow pipe and plastic limit load;and the stress distribution there under internal pressure and bending load was summarized, including location of the maximum axial stress and its calculation formulation. Analyzing the position effect of circumferential crack defects on the elbow pipe’ s bearing capacity shows that, as for the elbow pipe with smaller bending radius and bigger diameter-thickness ratio, the circumferential crack defect should be located at the spot of the maximal axial stress so as to deter-mine the elbow’ s bearing capacity and lay the foundation for further study of the plastic ultimate bending mo-ment and improvement of elbow failure assessment.%以弯管为研究对象,采用有限元法对弯管中间横截面应力分布规律和塑性极限载荷进行研究,给出了弯管在内压和弯矩载荷下的应力分布情况,指出了弯矩载荷下弯管中间截面最大轴向应力点位置和计算公式,分析了中间截面上不同位置周向裂纹缺陷对弯管塑性极限弯矩载荷的影响。结果表明,对于弯曲半径比较小,径厚比较大的弯管应将周向裂纹缺陷定位在最大轴向应力点确定弯管弯矩承载能力,为进一步研究弯管塑性极限弯矩,完善弯管失效评定奠定基础。

  8. Brain Image Motion Correction

    DEFF Research Database (Denmark)

    Jensen, Rasmus Ramsbøl; Benjaminsen, Claus; Larsen, Rasmus;

    2015-01-01

    The application of motion tracking is wide, including: industrial production lines, motion interaction in gaming, computer-aided surgery and motion correction in medical brain imaging. Several devices for motion tracking exist using a variety of different methodologies. In order to use such devices...... offset and tracking noise in medical brain imaging. The data are generated from a phantom mounted on a rotary stage and have been collected using a Siemens High Resolution Research Tomograph for positron emission tomography. During acquisition the phantom was tracked with our latest tracking prototype...

  9. Osteoporotic compression fracture of the thoracolumbar spine and sacral insufficiency fracture: incidence and analysis of the relationship according to the clinical factors

    Energy Technology Data Exchange (ETDEWEB)

    Kong, Jeong Hwa; Park, Ji Sun; Ryu, Kyung Nam [Kyunghee University Hospital, Seoul (Korea, Republic of)

    2006-11-15

    To evaluate the incidence of sacral insufficiency fracture in osteoporotic patient with compression fracture of the thoracolumbar (T-L) spine on magnetic resonance image (MRI), and to analyze the correlation of variable clinical factors and the incidence of sacral insufficiency fracture. We retrospectively reviewed 160 patients (27 men, 133 women; age range of 50 to 89 years) who underwent spinal MRI and had compression fracture of the T-L spine. Compression fractures due to trauma or tumor were excluded. We evaluated the incidence of sacral insufficiency fracture according to the patients' age, sex, number of compression fractures, and the existence of bone marrow edema pattern of compression fracture. During the same period, we evaluated the incidence of spinal compression fracture in the patients of pelvic insufficiency fracture. Out of the 160 patients who had compression fracture in the T-L spine, 17 (10.6%) had insufficiency fracture of the sacrum. Compression fracture occurred almost 5 times more frequently in women (27:133), but the incidence of sacral insufficiency fracture was 2/27 for men (7.4%) and 15/133 for women (11.3%), with no statistically significant difference ({rho} = 0.80). According to age, the ratio of insufficiency fracture to compression fracture was 0% (0/23) in the 50's, 10.6% (7/66) in the 60's, 12.5% (7/56) in the 70's, and 20.0% (3/15) in the 80's. In respect of single and multiple compression fracture, the incidence of sacral insufficiency fracture was 8/65 for men (12.3%) and 9/95 for women (9.5%), showing no significant difference ({rho} = 0.37). In the patients with and without compression fracture with bone marrow edema, insufficiency fracture occurred in 5/76 (6.6%) and 12/84 (14.3%), respectively. On the other hand, of the 67 patients who had pelvic insufficiency fracture, 27 (40.3%) also had spinal compression fracture. About 10% of the patients with osteoporotic compression fracture in the T/L spine

  10. OCT Motion Correction

    Science.gov (United States)

    Kraus, Martin F.; Hornegger, Joachim

    From the introduction of time domain OCT [1] up to recent swept source systems, motion continues to be an issue in OCT imaging. In contrast to normal photography, an OCT image does not represent a single point in time. Instead, conventional OCT devices sequentially acquire one-dimensional data over a period of several seconds, capturing one beam of light at a time and recording both the intensity and delay of reflections along its path through an object. In combination with unavoidable object motion which occurs in many imaging contexts, the problem of motion artifacts lies in the very nature of OCT imaging. Motion artifacts degrade image quality and make quantitative measurements less reliable. Therefore, it is desirable to come up with techniques to measure and/or correct object motion during OCT acquisition. In this chapter, we describe the effect of motion on OCT data sets and give an overview on the state of the art in the field of retinal OCT motion correction.

  11. Contact Lenses for Vision Correction

    Science.gov (United States)

    ... Ask an Ophthalmologist Español Eye Health / Glasses & Contacts Contact Lenses Sections Contact Lenses for Vision Correction Proper ... to Know About Contact Lenses Colored Contact Lenses Contact Lenses for Vision Correction Written by: Kierstan Boyd ...

  12. Geologic interpretations of seismic data Route 128 (Northern Circumferential Highway) cut, and Hopkins Street grade separation stations 1-18 in Wakefield, Mass.

    Science.gov (United States)

    May, James E.; Lineham, Rev. Daniel

    1950-01-01

    The completion of a segment of the Northern Circumferential Highway, Route 126, in Wakefield, Mass., requires an underpass bridge at Hopkins Street, Station 5+50. The plan of the project shows approximately 1800 feet if approach cuts between stations 1 and 18. In October 1945 a preliminary seismic study was made of a segment of this cut between stations 6+50 and 13+30. Four profiles were made at this time and a report was submitted by Newton E. Chute and Rev. Daniel Linhan (file report of January 15). This work showed a relatively shallow (in general, 6 to 12 feet in depth) somewhat irregular bedrock surface between stations 6+50 and 13+50. That data indicated that much of this segment of the cut will be in bedrock. In order to obtain more complete data for the preparation of detailed estimates on the amount of bedrock to be excavated for this segment of the cut, and also to obtain sufficient data for the unexplored segment of the cut, 21 additional seismic traverses were made in September 1949. The present report contains only the results obtained from this later work. The work was performed as a part of a cooperative program of the Massachusetts Department of Public Works and the United States Geological Survey.

  13. Learning Curve in a Western Training Center of the Circumferential En Bloc Esophageal Endoscopic Submucosal Dissection in an In Vivo Animal Model

    Directory of Open Access Journals (Sweden)

    Miguel A. Tanimoto

    2011-01-01

    Full Text Available Aim. Evaluate the feasibility to overcome the learning curve in a western training center of the en bloc circumferential esophageal (ECE- ESD in an in vivo animal model. Methods. ECE-ESD was performed on ten canine models under general anesthesia on artificial lesions at the esophagus marked with coagulation points. After the ESD each canine model was euthanized and surgical resection of the esophagus and stomach was carried out according to “the Principles of Humane Experimental Technique, Russel and Burch.” The specimen was fixed with needles on cork submerged in formalin with the esophagus and stomach then delivered to the pathology department to be analyzed. Results. ECE-ESD was completed without complications in the last 3/10 animal models. Mean duration for the procedures was 192±35 minutes (range 140–235 minutes. All the procedures were done at the animal lab surgery room with cardio pulmonary monitoring and artificial ventilation by staff surgery members and a staff member of the Gastroenterology department trained during 1999–2001 at the Fujigaoka hospital of the Showa U. in Yokohama, Japan, length (range 15–18 mm and 51±6.99 width (range 40–60 mm. Conclusion. ECE-ESD training is feasible in canine models for postgraduate endoscopy fellows.

  14. Thromboembolic event rate in patients with persistent or paroxysmal atrial fibrillation post circumferential pulmonary vein isolation:a single center experience in China

    Institute of Scientific and Technical Information of China (English)

    ZHOU Jing-min; LIU Shao-wen; LIN Jia-xiong; NIE Zhen-ning; WU Hong-yi; ZHOU Jun; HAO Ying; CAI Nai-sheng; GE Jun-bo

    2007-01-01

    Background Pulmonary-vein isolation (PVI) is currently used for the treatment of chronic and paroxysmal atrial fibrillation and a major risk of PVI is thromboembolism. The purpose of this study was to observe embolic event rate in patients with persistent or paroxysmal atrial fibrillation (AF) undergone PVI.Methods Circumferential PVI (CPVI) was performed in 64 consecutive patients with persistent AF (42 men, aged (60.0±9.1) years) and in 84 consecutive patients with paroxysmal AF (53 men, aged (61.4±9.3) years). Warfarin was administrated in all patients before ablation for at least 3 weeks ((5.2±2.6) weeks) and continued for at least 3 months post ablation with international normalized ratio (INR) of 2.0-3.0. During CPVI, intravenous heparin was given at a dose of 5000-8000 U or 75-100 U/kg, followed by 1000 U or 12 U/kg per hour.Results In patients with persistent AF, 1 patient developed embolic event during ablation and 3 patients developed embolic events after ablation. In contrast, no thromboembolic event was observed in patients with paroxysmal AF (4/64vs 0/84, P=0. 033).Conclusion Thromboembolic event rate related to CPVI is significantly higher in patients with persistent AF than that in patients with paroxysmal AF.

  15. Illumination Correction on Biomedical Images

    OpenAIRE

    Edoardo Ardizzone; Roberto Pirrone; Orazio Gambino; Salvatore Vitabile

    2014-01-01

    RF-Inhomogeneity Correction (aka bias) artifact is an important research field in Magnetic Resonance Imaging (MRI). Bias corrupts MR images altering their illumination even though they are acquired with the most recent scanners. Homomorphic Unsharp Masking (HUM) is a filtering technique aimed at correcting illumination inhomogeneity, but it produces a halo around the edges as a side effect. In this paper a novel correction scheme based on HUM is proposed to correct the artifact mentioned abov...

  16. 胸腰椎骨折患者腹胀的护理干预及原因分析%Cause analysis and nursing intervention of abdominal distension in pa-tients with thoracolumbar fracture

    Institute of Scientific and Technical Information of China (English)

    邹艳贤; 谢红艳; 胡梅; 李文芳

    2015-01-01

    Objective To explore the cause and effective nursing intervention of abdominal distension in patients with thoracolumbar fracture. Methods 100 cases with thoracolumbar fractures from September 2011 to August 2013 in our department were selected and randomly divided into the experimental group and the control group,50 cases in each group.The experimental group was given the related nursing measures after admission,the control group was given the routine nursing care.The incidence of abdominal distension in two groups was compared. Results The incidence of ab-dominal distension in the experimental group was significantly lower than that in the control group,with significant dif-ference (P<0.01). Conclusion According to the cause of abdominal distention in patients with thoracolumbar fractures to take the related nursing measures,which can effectively prevent or alleviate patients’incidence of abdominal distension.%目的:探讨胸腰椎骨折后腹胀发生的原因及有效的护理干预。方法选取本科室2011年9月~2013年8月收治的100例胸腰椎骨折患者作为研究对象,随机分实验组和对照组,各50例。实验组从患者入院后即开始采取相关护理措施,对照组采用骨科护理常规进行护理,比较两组的腹胀发生率。结果实验组的腹胀发生率显著低于对照组,差异有统计学意义(P<0.01)。结论针对胸腰椎骨折患者发生腹胀的原因采取相关护理对策,可有效预防或减轻患者的腹胀发生率。

  17. Constipation acupuncture in the treatment of thoracolumbar fractures after abdominal distension constipation curative effect observation%便秘灸治疗胸腰椎骨折后腹胀便秘的疗效观察

    Institute of Scientific and Technical Information of China (English)

    任春霞

    2016-01-01

    目的:观察便秘灸治疗胸腰椎骨折患者腹胀、便秘的疗效。方法:将102例胸腰椎骨折后腹胀便秘的患者随机分成两组,观察组用便秘灸贴敷脐部,对照组给予腹部按摩、热敷、口服缓泻剂等方法。观察两组患者肛门排气、排便、腹胀消除的情况及观察两组病人副作用发生情况。结果:观察组总有效率96.15%,对照组74%。副作用发生情况:观察组9.16%,对照组36%。结论:便秘灸治疗胸腰椎骨折患者腹胀便秘效果优于按摩、热敷、口服缓泻剂等方法。两组比较,差异有统计学意义(P<0.01)。%Objective To observe the constipation main treatment of thoracolumbar fractures in patients with abdominal distension and constipation curative effect.Methods 102 cases of thoracolumbar fractures after abdominal distension constipation patients were randomly divided into two groups, observation group with constipation main navel, the control group given abdominal massage and hot compress, oral sugar-refining, etc. Observe two groups of patients with anal exhaust, defecation, abdominal distension, eliminate.Results Observation group total effectiveness 96.15%, control group 74%.Conclusion Abdominal distension of constipation in patients with constipation acupuncture treatment thoracolumbar fractures is better than massage and hot compress, oral sugar-refining, etc. Comparison of similar between the two groups was statistically significant (P<0.01).

  18. Application of intermediate screw technology on thoracolumbar fractures%经伤椎椎弓根置钉技术在胸腰段骨折中的应用

    Institute of Scientific and Technical Information of China (English)

    吕豪珍; 林红; 张绍昆; 闫明; 刘理迪

    2012-01-01

    BACKGROUND: For thoracolumbar fractures, there are a lot of fixed ways, however, at present intermediate screws in shortsegment pedicular fixation is minimal damage, cost less, and fixed tightly.OBJECTIVE: To systemic illustrate the technology of intermediate screw and clinical application effect.METHODS: A computer-based online search was performed on PuMed database and CNKI database with key words of"Intermediate screws, pedicular screw fixation, thoracolumbar fracture" in English and Chinese from January 1983 to June 2011.Repeated literatures were eliminated.RESULTS AND CONCLUSION: A total of 48 articles were included to review. Biological mechanics experimental and clinicalapplication result indicates that intermediate screws in short segment pedicular fixation can instantly reset vertebral fracture,restore vertebral body height, and compared with the traditional short segments of the posterior fixation, intermediate screws inshort segment pedicular fixation can effectively reduce the incidence of complications of internal fixation loose or screw breakage,vertebral height lost again.%背景:对于胸腰椎骨折,有很多固定方式,但目前经伤椎后路短节段内固定是损伤最小、费用较少,且固定牢固的固定方式.目的:系统阐述伤椎置钉技术的发展及其临床应用效果.方法:应用计算机检索1983-01/2011-06 PubMed数据库、中国知网数据库中相关文章,中文检索词为"伤椎置钉,椎弓根螺钉内固定,胸腰段骨折",英文检索词为"intermediate screws,pedicular screw fixation,thoracolumbar fracture".排除重复文献.结果与结论:共纳入48篇文献进行综述.目前,生物力学实验及临床应用结果证明,经伤椎短节段椎弓根螺钉内固定能即时复位骨折椎体,恢复椎体高度,且同传统的后路短节段内固定相比,能有效地降低内固定松动或短钉、伤椎高度再次丢失等并发症的发生率.

  19. 自助式悬吊牵引整复治疗单纯胸腰椎压缩性骨折%Investigation of Self-help Suspention Traction Therapy on Thoracolumbar Compression Fracture by SF-36

    Institute of Scientific and Technical Information of China (English)

    娄宇明; 唐汉武; 黄承军; 梁柱; 唐福宇; 徐敏; 梁冬波; 王继; 关威

    2012-01-01

    目的:观察自助式悬吊牵引整复对单纯胸腰椎压缩性骨折患者生活质量的影响.方法:100例单纯性胸腰椎压缩骨折患者,随机分成治疗组和对照组,每组50例,分别采用自助式悬吊牵引整复和垫枕复位治疗.分别观察治疗前及治疗结束后1个月时的“健康调查简易量表”(Medical Outcomes Study,SF-36)评分,并进行比较.结果:经统计分析显示治疗前两组SF-36问卷评分各维度无统计学差异,但治疗结束后1个月时的SF-36问卷评分显示悬吊牵引组在缓解躯体疼痛,恢复精力,恢复社会活动功能及精神、心理健康维度上优于垫枕复位对照组,差异有统计学意义(P<0.05).结论:自助式悬吊牵引整复治疗单纯性胸腰椎压缩骨折能更好的改善患者的SF-36问卷评分,提高生活质量.%Objective:To observe living quality of thoracolumbar compression fracture patients influenced by the therapy of self-help suspention traction. Method; 100 cases with thoracolumbar compression fracture were randomly divided into the control group (n=50 ) and self-help suspention traction therapy group ( n= 50). The SF-36 Health Survey Questionnaire were investigated before and 1 month after the treatment . Result: There was no statistic difference of SF-36 between the two groups before therapy (P>0. 05). But 1 month after the treatment ,it showed that the bodily pain relief, vitality recovering, rehabilitation of social function and mental health status of the therapy group was better than that of the control group (P<0. 05). Conclusion: The "Self-help Suspention Traction Therapy Treatment" for thoracolumbar compression fracture can improve scores of SF-36 and life quality.

  20. 经伤椎椎弓根椎体内植骨治疗胸腰椎爆裂性骨折临床观察%Clinical Observation of Blowout Fracture Within the Vertebral Pedicle Bone Graft for Thoracolumbar

    Institute of Scientific and Technical Information of China (English)

    陈煜东

    2015-01-01

    Objective To observe the pedicle bone graft for thoracolumbar burst fracture treatment. Methods 65 cases of thoracolumbar fracture patients were chosen from May 2011 to October 2012 in our hospital, they were given by pedicle bone graft treatment, surgery to vertebral CT taken as the center piece and X ray, fracture healing state, vertebral height and Cobb angle changes to improve the situation. Results The patients were followed up 0.5~3 years, the excellent was 87.69%in this group, all patients were low back pain, no fracture fixation, failure, loosening and other complications. Conclusion The administration of thoracolumbar burst fracture patients by internal pedicle bone graft treatment, helps promote healing, strengthen before vertebral column stability, reduce long-term complications.%目的:观察经伤椎椎弓根椎体内植骨对胸腰椎爆裂性骨折的治疗效果。方法选择2011年5月~2012年10月我院收治的65例胸腰椎爆裂性骨折患者,均给予经伤椎椎弓根椎体内植骨治疗,术后以伤椎为中心拍摄CT片及X线片,观察骨折愈合状态、伤椎高度变化及Cobb角改善情况。结果术后随访0.5~3年,本组优良率为87.69%,所有患者均未出现腰背疼痛,无内固定断裂、失效、松动等并发症。结论给予胸腰椎爆裂性骨折患者经伤椎椎弓根椎体内植骨治疗,有助于促进骨折愈合,加强伤椎前中柱稳定性,减少远期并发症发生。

  1. 手法整复胸腰椎后关节紊乱治疗腰背肌筋膜疼痛综合征%TREATING BACK MYOFASCIAL PAIN SYNDROME BY MAINPULATION OF THORACOLUMBAR FACET JOINT DISORDER

    Institute of Scientific and Technical Information of China (English)

    马永健; 王强; 张丽娜

    2012-01-01

    Objective To observe the clinical effect of the mainpulation of thoracolumbar facet joint disorder in treating back myofascial pain syndrome and its influence on the serum level of interleukin -1( IL - 1 ). Methods A total of 120 patients were randomly divided into treatment and control groups, the treatment group was treated by mainpulation and the control group was treated with oral Ibuprofen and Eperisone, the changes of clinical symptoms 、signs and the serum level IL - 1 were observed. Results The treatment group had obvious advantages in the total clinical effect, but not very different from the control group in lowering the serum level IL -1. Conclusion The thoracolumbar facet joint disorder is a major pathological change of back myofascial pain syndrome, and the mainpulation of thoracolumbar facet joint disorder has a good and lasting effect.%目的 观察手法整复胸腰椎后关节紊乱治疗腰背肌筋膜疼痛综合征的临床疗效及对血清白细胞介素(interleukin-1,IL-1)含量的影响.方法 患者120例,随机分成治疗组和对照组,分别采用手法整复胸腰椎后关节紊乱治疗和精氨酸布洛芬颗粒+乙哌立松片治疗,观察治疗前后临床症状、体征及血清IL-1含量的变化.结果 治疗组总疗效优于对照组(P<0.01),在降低血清IL-1含量方面与对照组差异无统计学意义(P>0.05).结论 胸腰椎后关节紊乱是腰背肌筋膜疼痛综合征一个重要病理改变,手法整复胸腰椎后关节紊乱在临床取得良好疗效且作用持久.

  2. Clinical observation of posterior internal fixation with vertebral pedicle screw and rod system on thoracolumbar spine fracture%采用后路椎弓根钉棒系统治疗胸腰椎骨折疗效观察

    Institute of Scientific and Technical Information of China (English)

    王洽君

    2013-01-01

    目的 观察后路椎弓根钉棒系统治疗胸腰椎骨折的临床疗效.方法 回顾性分析32例采用后路椎弓根钉棒系统治疗胸腰椎骨折患者的临床资料,术后最长获得2年随访,分析椎体高度、椎体序列和Cobb角的改变.结果 32例患者获得6~ 48个月随访,平均15.8个月.术后椎体前、后缘高度分别为(96.85±14.33)%、(97.44±12.38)%,明显大于术前的(46.67±11.25)%、(76.76±12.62)%(均P<0.05);术后Cobb角为(7.45±2.12)°,显著小于术前的(20.56±7.51).(P<0.05).术后患者Frankel分级均有改善.结论 应用椎弓根钉棒系统治疗胸腰椎骨折能取得良好的临床疗效.%Objective To observe the clinical effect of posterior internal fixation with vertebral pedicle screw and rod system on thoracolumbar spine fracture.Methods The clinical data of 32 patients diagnosed as thoracolumbar spine fracture in our hospital who treated with posterior internal fixation with vertebral pedicle screw and rod system were retrospectively analyzed.The Frankel scale combined with X-ray and CT images were used for the judgment of efficacy.Results The vertebral Height and Cobb angles were improved significantly after the operations (P <0.05).And the Frankel degree of cases with nerve symptoms was also improved.Conclusion Posterior internal fixation with vertebral pedicle screw and rod system is effective in treating patients with thoracolumbar spine fracture.

  3. Aloenxerto circunferencial de femur proximal em cirurgia de revisäo de artroplastia total de quadril: relato de casos com seguimento mínimo de 20 anos Circumferential proximal femoral allografts in revision surgery on total hip arthroplasty: case reports with a minimum follow-up of 20 years

    Directory of Open Access Journals (Sweden)

    Bruno Dutra Roos

    2012-01-01

    Full Text Available Dentre as opções para reconstrução femoral em cirurgias de revisão de artroplastia total do quadril (RATQ em defeitos circunferenciais extensos está a utilização de aloenxerto de fêmur proximal. O seu uso permite a correção do mecanismo abdutor do quadril e da discrepância de comprimento dos membros inferiores, além de apresentar potencial osteocondutivo. Os autores relatam os achados clínicos e radiográficos de dois casos de RATQ com uso desta técnica, em seguimento mínimo de 20 anos.Among the options for femoral reconstruction in total hip arthroplasty (THA revision procedures, in cases of extensive circumferential defects, is the use of proximal femoral allografts. This technique makes it possible to correct the hip abductor mechanism and the leg length discrepancy, as well as presenting osteoconductive potential. The authors report the clinical and radiographic results from two cases of THA revision using this technique, with a minimum follow-up of 20 years.

  4. 78 FR 34245 - Miscellaneous Corrections

    Science.gov (United States)

    2013-06-07

    .... 2.346(f). (77 FR 46576-46578, 46584; August 3, 2012). This change implements the intended revision... regulations to make miscellaneous corrections. These changes include updating the name of its human capital office, correcting and adding missing cross-references, correcting grammatical errors, revising...

  5. Radiation camera motion correction system

    Science.gov (United States)

    Hoffer, P.B.

    1973-12-18

    The device determines the ratio of the intensity of radiation received by a radiation camera from two separate portions of the object. A correction signal is developed to maintain this ratio at a substantially constant value and this correction signal is combined with the camera signal to correct for object motion. (Official Gazette)

  6. Temperature Corrected Bootstrap Algorithm

    Science.gov (United States)

    Comiso, Joey C.; Zwally, H. Jay

    1997-01-01

    A temperature corrected Bootstrap Algorithm has been developed using Nimbus-7 Scanning Multichannel Microwave Radiometer data in preparation to the upcoming AMSR instrument aboard ADEOS and EOS-PM. The procedure first calculates the effective surface emissivity using emissivities of ice and water at 6 GHz and a mixing formulation that utilizes ice concentrations derived using the current Bootstrap algorithm but using brightness temperatures from 6 GHz and 37 GHz channels. These effective emissivities are then used to calculate surface ice which in turn are used to convert the 18 GHz and 37 GHz brightness temperatures to emissivities. Ice concentrations are then derived using the same technique as with the Bootstrap algorithm but using emissivities instead of brightness temperatures. The results show significant improvement in the area where ice temperature is expected to vary considerably such as near the continental areas in the Antarctic, where the ice temperature is colder than average, and in marginal ice zones.

  7. XRF matrix corrections

    International Nuclear Information System (INIS)

    Full text: In order to obtain meaningful analytical information from an X-Ray Fluorescence spectrometer, it is necessary to correlate measured intensity values with sample concentrations. The ability to do this to a desired level of precision depends on taking care of a number of variables which influence measured intensity values. These variables include: the sample, which needs to be homogeneous, flat and critically thick to the analyte lines used for measurement; the spectrometer, which needs to perform any mechanical movements in a highly reproducible manner; the time taken to measure an analyte line, and the software, which needs to take care of detector dead-time, the contribution of background to the measured signal, the effects of line overlaps and matrix (absorption and enhancement) effects. This presentation will address commonly used correction procedures for matrix effects and their relative success in achieving their objective. Copyright (2002) Australian X-ray Analytical Association Inc

  8. EDITORIAL: Politically correct physics?

    Science.gov (United States)

    Pople Deputy Editor, Stephen

    1997-03-01

    If you were a caring, thinking, liberally minded person in the 1960s, you marched against the bomb, against the Vietnam war, and for civil rights. By the 1980s, your voice was raised about the destruction of the rainforests and the threat to our whole planetary environment. At the same time, you opposed discrimination against any group because of race, sex or sexual orientation. You reasoned that people who spoke or acted in a discriminatory manner should be discriminated against. In other words, you became politically correct. Despite its oft-quoted excesses, the political correctness movement sprang from well-founded concerns about injustices in our society. So, on balance, I am all for it. Or, at least, I was until it started to invade science. Biologists were the first to feel the impact. No longer could they refer to 'higher' and 'lower' orders, or 'primitive' forms of life. To the list of undesirable 'isms' - sexism, racism, ageism - had been added a new one: speciesism. Chemists remained immune to the PC invasion, but what else could you expect from a group of people so steeped in tradition that their principal unit, the mole, requires the use of the thoroughly unreconstructed gram? Now it is the turn of the physicists. This time, the offenders are not those who talk disparagingly about other people or animals, but those who refer to 'forms of energy' and 'heat'. Political correctness has evolved into physical correctness. I was always rather fond of the various forms of energy: potential, kinetic, chemical, electrical, sound and so on. My students might merge heat and internal energy into a single, fuzzy concept loosely associated with moving molecules. They might be a little confused at a whole new crop of energies - hydroelectric, solar, wind, geothermal and tidal - but they could tell me what devices turned chemical energy into electrical energy, even if they couldn't quite appreciate that turning tidal energy into geothermal energy wasn't part of the

  9. Anomaly Corrected Heterotic Horizons

    CERN Document Server

    Fontanella, A; Papadopoulos, G

    2016-01-01

    We consider supersymmetric near-horizon geometries in heterotic supergravity up to two loop order in sigma model perturbation theory. We identify the conditions for the horizons to admit enhancement of supersymmetry. We show that solutions which undergo supersymmetry enhancement exhibit an sl(2,R) symmetry, and we describe the geometry of their horizon sections. We also prove a modified Lichnerowicz type theorem, incorporating $\\alpha'$ corrections, which relates Killing spinors to zero modes of near-horizon Dirac operators. Furthermore, we demonstrate that there are no AdS2 solutions in heterotic supergravity up to second order in $\\alpha'$ for which the fields are smooth and the internal space is smooth and compact without boundary. We investigate a class of nearly supersymmetric horizons, for which the gravitino Killing spinor equation is satisfied on the spatial cross sections but not the dilatino one, and present a description of their geometry.

  10. Catalytic quantum error correction

    CERN Document Server

    Brun, T; Hsieh, M H; Brun, Todd; Devetak, Igor; Hsieh, Min-Hsiu

    2006-01-01

    We develop the theory of entanglement-assisted quantum error correcting (EAQEC) codes, a generalization of the stabilizer formalism to the setting in which the sender and receiver have access to pre-shared entanglement. Conventional stabilizer codes are equivalent to dual-containing symplectic codes. In contrast, EAQEC codes do not require the dual-containing condition, which greatly simplifies their construction. We show how any quaternary classical code can be made into a EAQEC code. In particular, efficient modern codes, like LDPC codes, which attain the Shannon capacity, can be made into EAQEC codes attaining the hashing bound. In a quantum computation setting, EAQEC codes give rise to catalytic quantum codes which maintain a region of inherited noiseless qubits. We also give an alternative construction of EAQEC codes by making classical entanglement assisted codes coherent.

  11. Deconvolution with correct sampling

    CERN Document Server

    Magain, P; Sohy, S

    1997-01-01

    A new method for improving the resolution of astronomical images is presented. It is based on the principle that sampled data cannot be fully deconvolved without violating the sampling theorem. Thus, the sampled image should not be deconvolved by the total Point Spread Function, but by a narrower function chosen so that the resolution of the deconvolved image is compatible with the adopted sampling. Our deconvolution method gives results which are markedly superior to those of other existing techniques: in particular, it does not produce ringing around point sources superimposed on a smooth background. Moreover, it allows to perform accurate astrometry and photometry of crowded fields. These improvements are a consequence of both the correct treatment of sampling and the recognition that the most probable astronomical image is not a flat one. The method is also well adapted to the optimal combination of different images of the same object, as can be obtained, e.g., via adaptive optics techniques.

  12. A study of circumferentially-heated and block-heated heat pipes. I - Experimental analysis and generalized analytical prediction of capillary limits. II - Three-dimensional numerical modeling as a conjugate problem

    Science.gov (United States)

    Schmalhofer, Joseph; Faghri, Amir

    1993-01-01

    The wall and centerline vapor temperatures and heat output are determined experimentally for a low-temperature copper-water heat pipe under uniform circumferential heating and block heating. The time required to reach a vapor temperature of 60 C from an initial ambient temperature of 21 C is determined for both modes of heating. The experimental capillary limit of the heat pipe is compared to the generalized capillary limits for block-heated pipes over a range of vapor temperatures. A three-dimensional numerical model is then developed for determining the temperature, pressure, and velocity distributions in the entire domain of a circumferentially heated and a block-heated pipe. The problem is formulated as a conjugate problem, without the assumption of a uniform vapor temperature. The predictions of the model are found to be in good agreement with the experimental data.

  13. Improved Lateral Anterior Surgical Approaches in Thoracolumbar Burst Fractures%改进的侧前方手术径路在胸腰椎爆裂性骨折中的应用

    Institute of Scientific and Technical Information of China (English)

    曹众; 米光明; 熊俭

    2013-01-01

      目的针对胸腰椎爆裂性骨折行改进侧前方手术径路的治疗效果进行研讨。方法对我院在2010年3月至2011年11月所收治的36例胸腰椎爆裂性骨折患者采取随机分配的方式分为治疗组与对照组,治疗组行改进的侧前方手术径路治疗,对照组行传统的胸腹膜外入路治疗,比较两组患者术中出血量、手术时间、最终治疗效果。对患者骨折情况进行随访3~12个月。结果36例患者手术均取得成功,治疗组在手术过程中出血量、总出血量、手术时间均少于对照组,两组患者数据对比具有明显差异(P<0.05)。随访两组患者术后均未出现感染、无截瘫加重、无植骨块塌陷等情况出现。结论对胸腰椎爆裂性骨折患者行改进的侧前方手术路径治疗方法能够减少术中出血量、总出血量,减短手术时间,最大限度保证脊柱稳定性,降低脊髓损伤的发生概率,保证治疗效果,是治疗胸腰椎爆裂性骨折疗效较好的治疗方法。%Objective To discuss the surgical approach improved side in front of thoracolumbar burst fracture line treatment effect. Methods 36 cases admitted to our hospital in March 2010-November thoracolumbar burst fracture patients were randomly divided into a treatment group and the control group, the treatment of lateral anterior surgical approach in the treatment group line improvements, the control group underwent traditional film outside the thoracoabdominal approach for treatment, the two groups were compared blood loss, operative time, the final treatment effect. Results 36 patients with surgery were successful, the treatment group in the amount of bleeding during surgery, the total amount of bleeding, surgery time was less than that of the control group, the two groups of patients with the comparison of the data with a significant difference (P<0.05). None of the follow-up postoperative infection, paraplegia heavier, graft

  14. 经皮可扩张椎体支柱块置入术治疗胸腰椎压缩骨折%Percutaneous intravertebral expandable pillar implanting for treatment of thoracolumbar vertebral compression fractures

    Institute of Scientific and Technical Information of China (English)

    黄智慧; 丁亮华; 胡新宇; 包欣南; 张乃东; 凌为其

    2012-01-01

    目的 探讨经皮可扩张椎体支柱块(IVEP)置入并植骨治疗胸腰椎压缩性骨折的手术技巧和短期疗效.方法 自2009年1月~2011年2月采用经皮穿刺经双侧椎弓根IVEP置入术治疗胸腰椎压缩性骨折42例(44椎),共置入支柱块88枚.结果 术后疼痛显著缓解,VAS评分及ODI评分均较术前明显降低.平均手术时间(38.8±5.3)min/椎.术后椎体高度平均恢复至正常椎体高度的(89.6±6.5)%,术后Cobb角明显变小.至末次随访,骨折愈合良好,无复位丢失和支柱块移位.结论 经皮可扩张IVEP置入并植骨治疗胸腰椎压缩性骨折的短期疗效满意,具有创伤小、手术操作简便、并发症少、并且可保留脊柱生理活动度的优点,是治疗该类骨折较为理想的选择.%Objective To study the operation techniques and therapeutic outcomes of percutaneous intravertebral expandable pillar (IVEP) implanting for treatment of thoracolumbar vertebral compression fractures. Methods Between January 2009 and February 2012, forty-two patients with thoracolumbar vertebral compression fractures were treated by percutaneously IVEP implanting and bone grafting through bilateral pedicle. Results Forty-four vertebral bodies were treated in forty-two patients. All patients successfully underwent the surgery without open-surgery or changing internal fixation. The average operation tune was (38.8?.3)min per vertebral body (range, 25~45 min). Pain was prominently relieved the next day after operation. The VAS was (8.2?.2) before operation and (2.3?.1) twenty-four hours after operation. The ODI was (53.2?3.4)% before operation and (24.9?4.7)%. The preoperative loss of vertebral height was 36% and it was reduced to 10% postoperatively. The average Cobb's angle was 23?preoperatively and 8?postoperatively. In an average follow up of 13.7 months (range 6-20 months), there were no loss of reduction and dislocation of IVEP. Conclusion These forty-two cases demonstrate that the IVEP

  15. Clinical outcomes of surgical correction for ankylosing spondylitic kyphosis%强直性脊柱炎后凸畸形的后路截骨矫形术及疗效分析

    Institute of Scientific and Technical Information of China (English)

    曾岩; 陈仲强; 郭昭庆; 齐强; 孙垂国; 李危石

    2010-01-01

    Objective To evaluate the clinical outcomes of posterior surgical corrective methods for ankylosing spondylitic kyphosis. Methods From June 2003 to June 2008, 21 cases of ankylosing spondylitic kyphosis received posterior surgical correction. There were 17 male and 4 female, and the average age was 39. 5 years (range, 20 to 57 years). The total spine X-ray and CT were used to evaluate sagittal balance and thoracolumbar spine kyphosis angle, and chin brow-vertical angle was obtained from clinical lateral photograph. The surgical goal was to correct sagittal imbalance and chin brow-vertical angle.The simulated osteotomy was performed in computer before surgery to determine the correction methods. The surgical methods included: 16 cases of monosegmental closing osteotomy correction, 3 cases of anterior opening-posterior closing osteotomy correction, and 2 cases of combined pedicle subtraction osteotomy in thoracolumbar spine and Smith-Peterson osteotomy in lumbar spine. All patients were followed up after surgery, and the improvement of sagittal imbalance, chin brow-vertical angle and thoracolumbar spine kyphosis angle were assessed. The symptoms relief and satisfied rate were also evaluated. Results The average operation time was 4.4hours, and the average blood loss was 1770 ml. Before surgery, the average thoracolumbar kyphosis angle was 62.1°,the average anterior shift of C7 plumb line was 172. 9 mm, and theaverage chin brow-vertical angle was 34. 9°. The average follow-up was 28. 8 months after surgery. The average correction rate of thoracolumbar kyphosis angle was 60%, the average improvement rate of anterior shift of C7 plumb line was 64%, and the average correction rate of chin brow-vertical angle was 98%. The improvement rate of back pain was 64% during follow-up. The total surgical satisfactory rate was 95%.Conclusion Based on the simulated osteotomy in computer before surgery, according to the characteristics of ankylosing spondylitic kyphosis, different

  16. 胸腰椎多节段脊柱骨折手术治疗的临床疗效分析%Analysis Clinical Curative Effect on Thoracolumbar Spinal Fracture Surgery

    Institute of Scientific and Technical Information of China (English)

    王雯筠

    2015-01-01

    Objective Analysis clinical curative effect on thoracolumbar spinal fracture surgery. Methods Adopt operation treatment for 75 cases with thoracolumbar multi segmental spinal, observation patients with fracture reduction and Frankel classification postoperative. Results All the patients were followed up, no internal fixation loosen, broken rods, screw breakage condition. Patients with vertebral height from preoperative 22.75%~75.41%to 80.54%~99.21%to postoperative recovery. Conclusion In thoracic and lumbar spine were treated with multi section treat according to the speciifc situation of patients with fracture of spinal column sequence, returned to normal, complete reconstruction of spinal stability.%目的:对胸腰椎多节段脊柱骨折手术治疗的临床疗效进行分析。方法对75例胸腰椎多节段脊柱患者对其进行手术治疗,术后观察患者骨折复位情况及Frankel分级情况。结果对患者进行随访,随访时患者均未出现内固定松动、断棒、断钉情况。患者椎体高度由术前22.75%~75.41%,恢复至术后80.54%~99.21%。结论在对胸腰椎多节段脊柱骨折患者进行治疗时应根据患者具体情况进行治疗,从而使患者脊柱序列恢复正常,完成重建脊柱稳定的目的。

  17. Electroanatomical systems to guided circumferential pulmonary veins ablation for atrial fibrillation: initial experience from comparison between the Ensite/NavX and CARTO system

    Institute of Scientific and Technical Information of China (English)

    LIU Xu; WANG Xin-hua; GU Jia-ning; ZHOU Li; QIU Jian-hua

    2005-01-01

    Background The circumferential pulmonary vein ablation (CPVA) has been proved effective for atrial fibrillation (AF) treatment and is becoming more widely accepted and practiced. This study aims to evaluate the characteristics of the CARTO and the Ensite/NavX system and draw a comparison between them on the aspects of procedural parameters and clinical effectiveness.Methods Seventy-five cases with paroxysmal or chronic symptomatic AF were randomly assigned to CPVA procedure guided by the Ensite/NavX system (group Ⅰ, n=40) and by the CARTO system (group Ⅱ, n=35). After successful transseptal procedure, the geometry of left atrium was created under the guidance of the two systems. Radiofrequency energy was applied to circumferentially ablate tissues out of pulmonary veins' (PVs') ostia. In cases with chronic AF, linear ablation was applied to modify the substrate of left atrium (LA). The endpoint of the procedure was complete PVs isolation. Results Seventy-five cases underwent the procedure successfully. The total procedure and fluoroscopic durations in group Ⅱ were significantly shorter than in group Ⅰ [(150±23) min and (18±17) min versus (170±34) min and (25±16) min, P=0.03 and 0.04, respectively]. There was no significant difference in the fluoroscopic and procedure durations for geometry creation between group Ⅰ and group Ⅱ [(8±4) min and (16±11) min versus (5±4) min and (14±8) min, respectively]. The fluoroscopic durations for CPVA were (15±5) min in group Ⅰ versus (10±6) min in group Ⅱ (P=0.05), and the CPVA procedural durations were significantly shorter in group Ⅱ than in group Ⅰ [(18±11) min versus (25±10) min, P=0.04]. AF was terminated by radio frequency delivery in 14 cases (35%) in group Ⅰ versus 5 cases (14%) in group Ⅱ (P=0.035). After CPVA complete PV isolation was attained in 26 cases (65%) in group Ⅰ versus 11 cases (31%) in group Ⅱ (P=0.004). During a mean follow-up of 7 months, 32 (80%) cases in group

  18. Thermodynamics of Error Correction

    Science.gov (United States)

    Sartori, Pablo; Pigolotti, Simone

    2015-10-01

    Information processing at the molecular scale is limited by thermal fluctuations. This can cause undesired consequences in copying information since thermal noise can lead to errors that can compromise the functionality of the copy. For example, a high error rate during DNA duplication can lead to cell death. Given the importance of accurate copying at the molecular scale, it is fundamental to understand its thermodynamic features. In this paper, we derive a universal expression for the copy error as a function of entropy production and work dissipated by the system during wrong incorporations. Its derivation is based on the second law of thermodynamics; hence, its validity is independent of the details of the molecular machinery, be it any polymerase or artificial copying device. Using this expression, we find that information can be copied in three different regimes. In two of them, work is dissipated to either increase or decrease the error. In the third regime, the protocol extracts work while correcting errors, reminiscent of a Maxwell demon. As a case study, we apply our framework to study a copy protocol assisted by kinetic proofreading, and show that it can operate in any of these three regimes. We finally show that, for any effective proofreading scheme, error reduction is limited by the chemical driving of the proofreading reaction.

  19. 周向多爆炸成型弹丸战斗部仿真%Simulation Study of Circumferential MEFP Warhead

    Institute of Scientific and Technical Information of China (English)

    张利; 彭雪琴

    2014-01-01

    为了提高多爆炸成形弹丸(MEFP)对武装直升机、巡航导弹及空地制导武器等目标的毁伤能力,通过在炸药周向布置多个药型罩、轴向布置多层结构的办法,设计了一种新型多枚爆炸成形弹丸战斗部,分析了弹丸成型过程中的力学特性并利用动力学仿真软件模拟了成形过程。毁伤计算结果表明:该型战斗部所形成的单个EFP在穿透10 mm 装甲后仍具有较高的剩余动能,对轻型装甲目标具有较高的毁伤效能,研究结果可为小口径MEFP战斗部设计提供参考。%To strength the multiple explosively formed projectiles’(MEFP)damage effect on such targets like armed helicopters,cruise missiles and ground guided weapons,liners this paper designed were cir-cumferential layered with multi-layers along the axial.After the analysis on the EFP’s mechanical proper-ties during the forming process,the dynamic simulation software was adopted to reappear this forming process.De Marre formula calculation results show:the single EFP’s residual kinetic energy was signifi-cant even after it penetrated 10mm armor plate.The result of this paper indicates that MEFP warhead has impressive prospect to damage the abovementioned targets,and it will provide valuable reference for the Small-Caliber of the EFP’s warhead.

  20. Initial experience with circumferential pulmonary vein isolation guided by Overlay Ref and CartoMerge in the treatment of paroxysmal atrial fibrillation

    Institute of Scientific and Technical Information of China (English)

    TANG Kai; ZHAO Dong-dong; ZHANG Jing-ying; CHEN Yan-qing; XU Ya-wei

    2010-01-01

    Background CartoMerge has been widely used in guiding circumferential pulmonary vein isolation (CPVI) for the treatment of paroxysmal atrial fibrillation (PAF).However, the procedure of landmarks selection varies among operators according to their experience.Techniques have to be established to standardize this procedure.We propose that Overlay Ref could facilitate this procedure.This paper aimed to report our initial experience with CPVI guided by Overlay Ref and CartoMerge for the treatment of PAF.Methods Fifty-nine patients with PAF were enrolled in this study.Using Overlay Ref technique, a reference image (inverted) was faded into the live fluoroscopic image.Landmarks of CartoMerge were selected from anatomic points of the top of superior pulmonary veins (PVs) and the bottom of inferior PVs guided by Overlay Ref image.Overlay Ref images were also used to guide the ablation procedure combining with CartoMerge.Results All patients were successfully mapped by CartoMerge guided by Overlay Ref.The distance between the mapping points and the CT surfaces was (1.42±0.67) mm for the patients as a whole.This led to a successful rate of 96%for isolation of pulmonary veins.Duration of ablation procedure was (92±17) minutes.And the total duration of procedure was (139±32) minutes.CartoMerge could also be performed just with 3 paries to 4 paries selected landmarks guided by Overlay Ref without a full anatomic model constructed by Carto.Then, the total duration of procedure could be shortened to (115±38) minutes.Conclusions Overlay Ref technique can facilitate the catheter ablation of PAF and can help to standardize the procedure of landmarks selection.

  1. Minimally Invasive Pedicle Screw Fixation Combined with Vertebroplasty with Calcium Phosphate Bone Cement in the Treatment of Thoracolumbar Burst Fracture%微创椎弓根钉内固定联合磷酸钙骨水泥椎体成形术治疗胸腰椎爆裂性骨折

    Institute of Scientific and Technical Information of China (English)

    顾宇彤; 梁朝革; 张亮; 林红; 周健

    2015-01-01

    ,who suffered from single fresh thoracolumbar burst fracture without neurologic deficits and were classified as A3 fracture located between T11~L2 ,underwent the procedure of minimally invasive pedicle screw fixation combined with PVP with calcium phosphate bone cement .Duration of operation and blood loss ,injected volume of bone cement and length of stay ,were recorded .Lumbago and backache scores assessed by visual analogue scale (VAS) were recorded before surgery ,immediately after surgery ,as well as 1 month ,2 months ,3 months ,6 months ,1 year and 2 years after surgery . Vertebral compression rate and restoring rate ,Cobb angle and correction rate of vertebral kyphosis ,were measured at each time point and compared among the time points .Results:The average injected volume of calcium phosphate bone cement was 4 .9(3 .8~6 .4)mL .The mean duration of operation was 92(75~120)min .The average blood loss was 52(40~75)mL .The mean length of stay was 5 .6(4~ 7) d and the average follow‐up period was 26 months (24 ~ 29) .The VAS significantly decreased from 8 .8 ± 1 .2 before surgery to 1 .8 ± 0 .6 immediately after surgery and 0 .4 ± 0 .5 at 2 years after surgery ,and the differences were statistically significant(P< 0 .001) .The compression rate of vertebral body height decreased from(50 .4 ± 7 .2)% before surgery to (6 .2 ± 1 .5)% immediately after surgery and(6 .9 ± 1 .4)% at 2 years after surgery ,and the differences were statistically significant(P<0 .001) .The Cobb angle decreased from (22 .6 ± 1 .8)° before surgery to (3 .2 ± 1 .7)° immediately after surgery and (5 .1 ± 1 .5)° at 2 years after surgery ,and the differences were statistically significant(P<0 .001) .No significant decrease in both kyphosis correction and vertebral body height restoration was observed during the follow‐up .There was no loosen screw or broken screw .Conclusions:Minimally invasive pedicle screw fixation combined with PVP with calcium phosphate bone cement is a safe and

  2. Nested Quantum Error Correction Codes

    CERN Document Server

    Wang, Zhuo; Fan, Hen; Vedral, Vlatko

    2009-01-01

    The theory of quantum error correction was established more than a decade ago as the primary tool for fighting decoherence in quantum information processing. Although great progress has already been made in this field, limited methods are available in constructing new quantum error correction codes from old codes. Here we exhibit a simple and general method to construct new quantum error correction codes by nesting certain quantum codes together. The problem of finding long quantum error correction codes is reduced to that of searching several short length quantum codes with certain properties. Our method works for all length and all distance codes, and is quite efficient to construct optimal or near optimal codes. Two main known methods in constructing new codes from old codes in quantum error-correction theory, the concatenating and pasting, can be understood in the framework of nested quantum error correction codes.

  3. Food systems in correctional settings

    DEFF Research Database (Denmark)

    Smoyer, Amy; Kjær Minke, Linda

    Food is a central component of life in correctional institutions and plays a critical role in the physical and mental health of incarcerated people and the construction of prisoners' identities and relationships. An understanding of the role of food in correctional settings and the effective...... management of food systems may improve outcomes for incarcerated people and help correctional administrators to maximize their health and safety. This report summarizes existing research on food systems in correctional settings and provides examples of food programmes in prison and remand facilities......, including a case study of food-related innovation in the Danish correctional system. It offers specific conclusions for policy-makers, administrators of correctional institutions and prison-food-service professionals, and makes proposals for future research....

  4. Health care in correctional facilities.

    OpenAIRE

    Thorburn, K M

    1995-01-01

    More than 1.3 million adults are in correctional facilities, including jails and federal and state prisons, in the United States. Health care of the inmates is an integral component of correctional management. Health services in correctional facilities underwent dramatic improvements during the 1970s. Public policy trends beginning in the early 1980s substantially affected the demographics and health status of jail and prison populations and threatened earlier gains in the health care of inma...

  5. Comparison of Topographic Correction Methods

    Directory of Open Access Journals (Sweden)

    Rudolf Richter

    2009-07-01

    Full Text Available A comparison of topographic correction methods is conducted for Landsat-5 TM, Landsat-7 ETM+, and SPOT-5 imagery from different geographic areas and seasons. Three successful and known methods are compared: the semi-empirical C correction, the Gamma correction depending on the incidence and exitance angles, and a modified Minnaert approach. In the majority of cases the modified Minnaert approach performed best, but no method is superior in all cases.

  6. Corrective Feedback and Teacher Development

    OpenAIRE

    Ellis, Rod

    2009-01-01

    This article examines a number of controversies relating to how corrective feedback (CF) has been viewed in SLA and language pedagogy. These controversies address (1) whether CF contributes to L2 acquisition, (2) which errors should be corrected, (3) who should do the correcting (the teacher or the learner him/herself), (4) which type of CF is the most effective, and (5) what is the best timing for CF (immediate or delayed). In discussing these controversies, both the pedagogic and SLA litera...

  7. QCD corrections to triboson production

    Science.gov (United States)

    Lazopoulos, Achilleas; Melnikov, Kirill; Petriello, Frank

    2007-07-01

    We present a computation of the next-to-leading order QCD corrections to the production of three Z bosons at the Large Hadron Collider. We calculate these corrections using a completely numerical method that combines sector decomposition to extract infrared singularities with contour deformation of the Feynman parameter integrals to avoid internal loop thresholds. The NLO QCD corrections to pp→ZZZ are approximately 50% and are badly underestimated by the leading order scale dependence. However, the kinematic dependence of the corrections is minimal in phase space regions accessible at leading order.

  8. New orbit correction method uniting global and local orbit corrections

    Science.gov (United States)

    Nakamura, N.; Takaki, H.; Sakai, H.; Satoh, M.; Harada, K.; Kamiya, Y.

    2006-01-01

    A new orbit correction method, called the eigenvector method with constraints (EVC), is proposed and formulated to unite global and local orbit corrections for ring accelerators, especially synchrotron radiation(SR) sources. The EVC can exactly correct the beam positions at arbitrarily selected ring positions such as light source points, simultaneously reducing closed orbit distortion (COD) around the whole ring. Computer simulations clearly demonstrate these features of the EVC for both cases of the Super-SOR light source and the Advanced Light Source (ALS) that have typical structures of high-brilliance SR sources. In addition, the effects of errors in beam position monitor (BPM) reading and steering magnet setting on the orbit correction are analytically expressed and also compared with the computer simulations. Simulation results show that the EVC is very effective and useful for orbit correction and beam position stabilization in SR sources.

  9. Advances in Treatment of Thoracolumbar Fractures by Using Pedicle Screw Fixation at the Level of the Fractured Vertebra%胸腰椎爆裂骨折后路伤椎椎弓根钉固定的治疗进展

    Institute of Scientific and Technical Information of China (English)

    林冬铭; 宋舟锋

    2012-01-01

    [目的]介绍胸腰椎椎弓根的解剖学特点、伤椎椎弓根钉固定的生物力学和临床应用研究进展.[方法]查阅近年来国内外有关文献,进行综合分析.[结果]伤椎椎弓根钉固定治疗胸腰椎爆裂性骨折,有助于改善骨折椎复位难、固定强度不够、复位椎体高度丢失、内置物松动断裂等缺点,但尚需进一步的理论及临床研究.[结论]伤椎椎弓根钉固定为胸腰椎爆裂性骨折的治疗提供了一种有效的内固定方法.%[Objective] To introduce the anatomic character of thoracolumbar, the progress of biomechanical & clinical study of using pedicle screw fixation at the level of the fractured vertebra. [Methods] Related literatuis concerning the treatment of thoracolumbar fractures by using pedicle screw fixation at me level of the fractured vertebra in recent years were extensively reviewed. [Results]The method of using pedicle screw fixation at the level of the fractured vertebra can well achieve outcome in reduction and stability of the posterior transpedicular fixation to treat thoracolumbar vertebra fracture patients. [Conclusion] The pedicle screw fixation at the level of the fractured vertebra is an effective internal fixation for treatment of thoracolumbar fractures.

  10. 胸腰段陈旧性压缩性骨折患者椎体变形与相邻椎间盘退变的相关性%Correlation of vertebral body deformity and adjacent disc degeneration in patients with old thoracolumbar compression fractures

    Institute of Scientific and Technical Information of China (English)

    崔运能; 李绍林; 赵银霞; 岑黄

    2015-01-01

    Objective To assess the correlation between vertebral body deformity and degeneration of the adjacent intervertebral discs in patients with old thoracolumbar compression fractures. Methods Seventy-one patients who had been conservatively treated after single segment thoracolumbar compression fractures between April, 2011 and May, 2014 were enrolled in this study. Both radiographic and magnetic resonance (MR) images of the thoracolumbar segment were obtained. The involved vertebral body deformity was rated on radiography according to the Genant criterion, and the degeneration of the adjacent cephalic and caudal discs was assessed on MR images using the Oner and Pfirrmann classification schemes, respectively. The relationship between vertebral body deformity and adjacent disc changes was assessed using correlation analysis, and the changes in the adjacent cranial and caudal discs was compared. Results The Genant classification of the involved vertebral bodies was moderately correlated with Oner morphological scores (r=0.48, P0.05). The Oner classification of the adjacent cephalic discs was higher than that of the adjacent caudal discs (P0.05),变形椎体相邻头侧的椎间盘Oner分度较相邻尾侧椎间盘高(P0.05)。结论胸腰段椎体压缩性骨折主要影响相邻头侧椎间盘的形态,两者严重程度相一致,而相邻尾侧椎间盘不受影响。

  11. Correct and efficient accelerator programming

    OpenAIRE

    Cohen, Albert; Donaldson, Alistair F.; Huisman, Marieke; Katoen, Joost-Pieter

    2013-01-01

    This report documents the program and the outcomes of Dagstuhl Seminar 13142 “Correct and Efficient Accelerator Programming”. The aim of this Dagstuhl seminar was to bring together researchers from various sub-disciplines of computer science to brainstorm and discuss the theoretical foundations, design and implementation of techniques and tools for correct and efficient accelerator programming.

  12. Atmospheric correction of satellite data

    Science.gov (United States)

    Shmirko, Konstantin; Bobrikov, Alexey; Pavlov, Andrey

    2015-11-01

    Atmosphere responses for more than 90% of all radiation measured by satellite. Due to this, atmospheric correction plays an important role in separating water leaving radiance from the signal, evaluating concentration of various water pigments (chlorophyll-A, DOM, CDOM, etc). The elimination of atmospheric intrinsic radiance from remote sensing signal referred to as atmospheric correction.

  13. The changes of the interspace angle after anterior correction and instrumentation in adolescent idiopathic scoliosis patients

    Directory of Open Access Journals (Sweden)

    Fei Qi

    2007-10-01

    Full Text Available Abstract Background In idiopathic scoliosis patients, after anterior spinal fusion and instrumentation, the discs (interspace angle between the lowest instrumented vertebra (LIV and the next caudal vertebra became more wedged. We reviewed these patients and analyzed the changes of the angle. Methods By reviewing the medical records and roentgenograms of adolescent idiopathic scoliosis patients underwent anterior spinal fusion and instrumentation, Cobb angle of the curve, correction rate, coronal balance, LIV rotation, interspace angle were measured and analyzed. Results There were total 30 patients included. The mean coronal Cobb angle of the main curve (thoracolumbar/lumbar curve before and after surgery were 48.9° and 11.7°, respectively, with an average correction rate of 76.1%. The average rotation of LIV before surgery was 2.1 degree, and was improved to 1.2 degree after surgery. The interspace angle before surgery, on convex side-bending films, after surgery, at final follow up were 3.2°, -2.3°, 1.8° and 4.9°, respectively. The difference between the interspace angle after surgery and that preoperatively was not significant (P = 0.261, while the interspace angle at final follow-up became larger than that after surgery, and the difference was significant(P = 0.012. The interspace angle after surgery was correlated with that on convex side-bending films (r = 0.418, P = 0.022, and the interspace angle at final follow-up was correlated with that after surgery (r = 0.625, P = 0.000. There was significant correlation between the loss of the interspace angle and the loss of coronal Cobb angle of the main curve during follow-up(r = 0.483, P = 0.007. Conclusion The interspace angle could be improved after anterior correction and instrumentation surgery, but it became larger during follow-up. The loss of the interspace angle was correlated with the loss of coronal Cobb angle of the main curve during follow-up.

  14. Relativistic corrections to stopping powers

    International Nuclear Information System (INIS)

    Relativistic corrections to the nonrelativistic Bethe-Bloch formula for the stopping power of matter for charged particles are traditionally computed by considering close collisions separately from distant collisions. The close collision contribution is further divided into the Mott correction appropriate for very small impact parameters, and the Bloch correction, computed for larger values. This division of the region of close collisions leads to a very cumbersome result if one generalizes the original Bloch procedure to relativistic energies. The authors avoid the resulting poorly specified scattering angle theta/sub o/ that divides the Mott and Bloch correction regimes by using the procedure suggested by Lindhard and applied by Golovchenko, Cox and Goland to determine the Bloch correction for relativistic velocities. 25 references, 2 figures

  15. Shell corrections in stopping powers

    Science.gov (United States)

    Bichsel, H.

    2002-05-01

    One of the theories of the electronic stopping power S for fast light ions was derived by Bethe. The algorithm currently used for the calculation of S includes terms known as the mean excitation energy I, the shell correction, the Barkas correction, and the Bloch correction. These terms are described here. For the calculation of the shell corrections an atomic model is used, which is more realistic than the hydrogenic approximation used so far. A comparison is made with similar calculations in which the local plasma approximation is utilized. Close agreement with the experimental data for protons with energies from 0.3 to 10 MeV traversing Al and Si is found without the need for adjustable parameters for the shell corrections.

  16. Holographic thermalization with Weyl corrections

    Science.gov (United States)

    Dey, Anshuman; Mahapatra, Subhash; Sarkar, Tapobrata

    2016-01-01

    We consider holographic thermalization in the presence of a Weyl correction in five dimensional AdS space. We first obtain the Weyl corrected black brane solution perturbatively, up to first order in the coupling. The corresponding AdS-Vaidya like solution is then constructed. This is then used to numerically analyze the time dependence of the two point correlation functions and the expectation values of rectangular Wilson loops in the boundary field theory, and we discuss how the Weyl correction can modify the thermalization time scales in the dual field theory. In this context, the subtle interplay between the Weyl coupling constant and the chemical potential is studied in detail.

  17. 聚乙烯管道热熔接头环向裂纹应力强度因子的数值分析%Numerical Analysis of Stress Intensity Factor for Circumferential Cracks of Polyethylene Pipe's Hot Melting Joints

    Institute of Scientific and Technical Information of China (English)

    朱志彬; 杨晓翔; 陈丽静; 林乃昌; 庄鹏辉

    2013-01-01

    应力强度因子K是缺陷结构安全评定的重要参数.基于粘弹性理论,将聚乙烯管材料的粘弹性参数用Prony级数表示,运用非线性有限元法,在ANSYS中建立聚乙烯管热熔接头环向裂纹模型,并对K进行计算和分析.通过有限元的模拟,总结得到聚乙烯管最可能发生断裂的时间为产生裂纹时刻,从而得出分析聚乙烯管环向表面裂纹应力强度因子时不必考虑聚乙烯管的黏弹性,环向表面裂纹缺陷的主要影响因素是裂纹深度与聚乙烯管的厚度之比.%Aiming at the PE pipe' s viscoelastic properties,the Ansys was used to simulate and analyze the hot melting connector' s mechanical properties of the PE pipe with circumferential surface cracks,and the Prony series was used to analog material's viscoelastic properties,as well as the 1/4 node singular element was used to mesh the volumes at the crack boundary and to calculate the stress intensity factor of the PE pipe under the well-distributed internal pressure.The finite element simulation shows that the time of PE pipe rupture is just the moment that the crack occurs,and it is unnecessary to take PE pipe' s viscoelasticity into account while calculating the stress intensity factor of circumferential surface cracks.The crack depth-PE pipe thickness ratio mainly influences the circumferential cracks.

  18. Clinical study of microsplint and circumferential wiring in the treatment of mandibular body fracture in children%微型夹板配合环颌结扎治疗儿童下颌体部骨折的研究

    Institute of Scientific and Technical Information of China (English)

    姜刚勇

    2015-01-01

    目的:探讨微型夹板配合环颌结扎固定在儿童下颌骨体部骨折治疗中的应用。方法:选择2009~2012年儿童下颌体部骨折23例,采用微型夹板配合环颌结扎固定,观察其疗效。结果:微型夹板配合环颌结扎固定方法对儿童下颌骨骨折进行治疗具有不损伤恒牙胚,骨折复位良好、固定稳固、不影响进食,便于口腔清洁的特点。结论:微型夹板配合环颌结扎固定是治疗儿童下颌骨体部骨折的有效方法。%Objective:To evaluate the application of microsplint and circumferential wiring in the treatment of mandibular body frac-ture in children.Methods:23 children with mandibular body fracture were treated by microsplint and circumferential wiring from 2009 to 2012,the effects of treatment were assessed.Results:Treatment with microsplint and circumferential wiring did not injure perma-nent teeth germ.It showed many features,such as easy reduction of fractured bone segments,stable fixation,without interfere with eat-ing and benefit of mouth clearness.Conclusion:Microsplin and cicumferential wiring is effective for the treatment of mandibular body fracture in children.

  19. 注入骨水泥治疗胸腰椎骨质疏松性骨折:成熟技术中的常见问题%Bone cement injection for the treatment of thoracolumbar osteoporotic fractures:Common problems in the mature technology

    Institute of Scientific and Technical Information of China (English)

    韩卫东; 黄爱军; 陈丽萍

    2013-01-01

      背景:注入骨水泥是胸腰椎骨质疏松性骨折常用的固定方法之一。目的:评估注入骨水泥内固定胸腰椎骨质疏松性骨折的生物力学性能以及固定效果。方法:选取骨质疏松胸腰椎标本,测定骨密度以及最大压力载荷、位移、刚度等力学性能指标,建立骨折模型,注入骨水泥固定后,再次测定最大压力载荷、位移、刚度指标,比较注入骨水泥固定前后生物性能的变化,同时与椎弓根螺钉固定胸腰椎骨质疏松性骨折的生物学性能进行比较。对注入骨水泥固定胸腰椎骨质疏松性骨折的患者进行随访观察,通过评估患者缓解疼痛程度、胸腰椎体高度恢复程度以及骨水泥注入量和骨水泥外渗等情况,明确注入骨水泥固定治疗的效果。结果与结论:生物力学实验测定注入骨水泥固定胸腰椎骨质疏松性骨折后的最大载荷为2285 N,比骨折前承受的最大载荷1954 N强度增加了近16.9%,注入骨水泥固定胸腰椎骨质疏松性骨折后的刚度为427 N,比骨折前刚度349 N增加了近22.1%,显示出良好的生物性能。对应用注入骨水泥固定胸腰椎骨质疏松性骨折的患者以及应用闭合复位注入骨水泥固定胸腰椎骨质疏松性骨折的患者进行随访观察,结果发现2种方法均可以使患者的疼痛得到明显的缓解,而闭合复位注入骨水泥固定胸腰椎骨质疏松性骨折时骨水泥注入量、局部后凸角以及椎体高度恢复情况均更好,表明闭合复位辅助下注入骨水泥固定是胸腰椎骨质疏松性骨折安全有效的治疗方法。%  BACKGROUND: Bone cement injection is one of the commonly used methods for the treatment of thoracolumbar osteoporotic fractures. OBJECTIVE: To evaluate biomechanical properties and fixed effects of bone cement injection for the treatment of thoracolumbar osteoporotic fractures. METHODS: The specimens of

  20. 数字化虚拟手术系统在胸腰椎骨折治疗中的应用价值%Value of digital virtual surgery system in surgical treatment of thoracolumbar vertebral fracture

    Institute of Scientific and Technical Information of China (English)

    王秀会; 付备刚; 王明辉

    2016-01-01

    Objective To discuss the core value of digital virtual surgery system(DVSS),and verify its accuracy in the treatment of thoracolumbar vertebral fracture. Methods From March 2008 to June 2011,113 patients of burst Denis B thoracolumbar fractures were treated with traditional posterior short segment internal fixation(Group A). From March 2012 to September 2014,128 patients of burst Denis B thoracolumbar fractures were treated with traditional posterior short segment internal fixation with the best operation plan designed by DVSS simulated operation(Group B). Comparison was made in the operation time,intra-operative perspective time,blood loss and penetration condition on lateral wall of vertebral pedicle and anterior cortex between the 2 groups. Results There was no infection and hematoma in both groups. The operation time,intra-operative perspective time and penetration condition on lateral wall of vertebral pedicle and anterior cortex in Group B were all better than those of Group A(P0.05). Other adverse outcomes did not occur in the 2 groups. Conclusion The application of DVSS in spinal surgery has the advantages of simple procedures,high safety,accuracy and clinical reliability,which leads to wide popularization.%目的:探讨数字化虚拟手术系统(digital virtual surgery system,DVSS)在治疗胸腰段骨折中的应用价值并验证其准确性。方法2008年3月—2011年6月,对113例胸腰段单椎体爆裂型Denis B型骨折患者采用传统后路短节段经伤椎置钉行复位固定(A组)。2012年3月—2014年9月,对128例胸腰段单椎体爆裂型Denis B型骨折患者术前应用DVSS模拟骨折复位,制定最佳手术方案后行后路短节段经伤椎置钉(B组),手术方式与A组相同。比较2组病例手术时间、术中透视时间、术中出血量、椎弓根侧壁及椎体前方骨皮质穿破情况。结果2组均无感染、血肿发生。B组在手术时间、术中透视时间、椎弓根钉穿破

  1. 观察胸腰椎多节段脊柱骨折手术治疗的临床疗效%Observation on Clinical Effect of Surgery for Spinal Fracture of Thora-columbar Segments

    Institute of Scientific and Technical Information of China (English)

    李少平; 杨光勇; 潘继春

    2015-01-01

    目的:探讨胸腰椎多节段脊柱骨折手术的临床疗效。方法该研究报告选取了在该院接受治疗的胸腰椎多节段脊柱骨折患者60例为研究对象,征求患者治疗意愿后,分为观察组与对照组,观察组采用前路手术治疗,对照组采用后路手术治疗,分别采用不同术后观察患者手术疗效。结果对照组椎体前缘高度为(22.28±4.02),后凸角为(17.61±2.88),观察组前缘高度为(32.01±4.32),后凸角为(5.23±3.08),观察组病变椎体的平均高度有显著改善(P0.05),观察组患者治疗有效率为96.67%;对照组患者治疗有效率为93.33%。结论临床上在治疗胸腰椎多节段脊椎骨折时,应根据患者不同的骨折情况给予患者不同的手术治疗,[A1]前路手术对改善胸腰椎多节段脊柱骨折患者椎体前缘高度以及后凸角有着重要的作用,帮助患者减轻椎体压力,并对脊柱起良好固定作用。%Objective To investigate the clinical curative effect of surgery for spinal fracture of thoracolumbar segments. Methods This study selected 60 patients in the hospital for treatment of thoracolumbar spine fracture as the research object and divided into observation group and control group with patients' preferences. The observation group was given the anterior surgical treatment, while the control group was treated by posterior approach. Postoperative surgical curative effect of the two groups was observed. Results Control group fanterior flange height is (22.28±4.02), lobe was (17.61±2.88), after the observation group leading edge height is(32.01±4.32)mm, lobe was(5.23±3.08), after the observation group of lesions the average height of the vertebral body has improved significantly (P0.05), the observation group of patients treatment effective rate was 96.67%;The control group patients treatment effective rate was 93.33%. Conclusion Clinical in the treatment of thoracolumbar vertebral fractures, should

  2. 胸腰椎骨折后部韧带复合体损伤中MRI诊断价值的探讨%Reliability of magnetic resonance imaging in diagnosing posterior ligament complex injury in thoracolumbar fractures

    Institute of Scientific and Technical Information of China (English)

    张涛; 冯世庆; 姜文学; 高延征

    2008-01-01

    Objective To analyze the reliability of magnetic resonance imaging (MRI) in detecting posterior ligament complex injury in thoracolumbar fractures. Methods Ninety-five patients with thoracolumbar fracture were evaluated by palpation of the interspinal gap, plain radiography, and MRI before operation. In addition to conventional MRI sequences, a fat-suppressed T2-weighted sagittal sequence was performed. Surgery was performed by a posterior approach. During the operation, posterior ligament complex was examined. Results A wide interspinal gap was palpated in 41 patients and was found in 55 patients on plain radiography. According to MRI, injury to the supraspinal ligament was suspected in 85 patients, the interspinal ligament in 83 patients, and the ligamenta tiara in 26 patients. There were 82 supraspinal ligament injuries, 80 interspinal ligament injuries, and 20 ligamenta flava injuries in operative findings. The relations between plain radiography and operative findings, between MRI interpretation and operative findings were statistically significant. Conclusion A fat-suppressed T2-weighted sagittal sequence of MRI is a highly sensitive, specific, and accurate method to detect posterior ligament complex injury and which is recommended for the accurate evaluation of posterior ligament complex injury in thoracolumbar fractures.%目的 评估MRI对诊断胸腰椎骨折患者后部韧带复合体损伤的可靠性. 方法 95例胸腰椎骨折患者,术前进行棘突间隙触诊、X线片、MRI检查,其中MRI检查在传统的成像基础上,加做矢状12抑脂序列.采用后入路手术,手术中仔细检查后部韧带复合体损伤情况. 结果 触诊棘突间隙增宽41例,X线片55例,MRI发现韧带复合体损伤85例,其中棘上韧带损伤85例,棘间韧带损伤83例,黄韧带损伤26例;手术发现棘上韧带损伤82例,棘间韧带损伤80例,黄韧带损伤20例.触诊与手术所见无相关性,X线片诊断、MRI诊断与

  3. 椎弓根内固定椎体后凸成形术治疗骨质疏松性胸腰椎骨折%Pedicle Screw Fixation Kyphoplasty in Treatment of Osteoporotic Thoracolumbar Fracture

    Institute of Scientific and Technical Information of China (English)

    柯勇

    2013-01-01

    目的探讨椎弓根内固定结合椎体后凸成形术治疗骨质疏松性胸腰椎骨折的方法及临床治疗的效果。方法自2011年2月~2012年2月本院采用后路切开椎弓根内固定结合椎体后凸成形术治疗13例骨质疏松性胸腰椎压缩性骨折患者。术后随访24个月,术后复查胸腰椎正侧位片。分别于术前、术后4d、末次随访用Oswestry功能障碍指数评分(oswestry disability index,ODI),X线片上测量椎体矢状面指数(sagittal index,SI)及Cobb角(SI=椎体前缘高度/椎体后缘高度),观察内固定及伤椎稳定及功能恢复情况。结果所有患者都未发生骨水泥渗漏,无神经症状的缺失。13例患者中,12例获平均20个月随访,末次随访时患者的功能恢复良好,未发现椎弓根钉松动、断裂。结论椎弓根内固定结合椎体后凸成形术为骨质疏松性胸腰椎压缩性骨折的手术治疗提供了一种安全、可靠的方法,改善了机体的功能,提高了患者的生活质量。%Objective To investigate the pedicle screw fixation combined with kyphoplasty treatment of osteoporotic thoracolumbar fractures and clinical treatment ef ect. Methods The hospital incision posterior pedicle screw fixation combined with kyphoplasty treatment of 13 cases of osteoporotic thoracolumbar vertebral compression fracture patients from February 2011 to February 2012 The patients were fol owed up for 24 months, after review of the thoracic and lumbar lateral radiographs. Preoperative and postoperative 4D, the last fol ow-up, the Oswestry Disability Index score (oswestry disability index, ODI), X-ray measurement the vertebral sagit al index (sagit al index, SI) and the Cobb angle (SI =vertebral edge height /posterior margin height), fixed and the injured vertebra stable and function recovery observed. Results Al patients had happened leakage of bone cement, the lack of neurological symptoms. 13 patients, 12 patients were an average of 20 months fol ow

  4. Study on the accuracy of thoracolumbar pedicle screw installation assisted by O-arm navigation%O-arm导航辅助下胸腰椎椎弓根螺钉置入精确度研究

    Institute of Scientific and Technical Information of China (English)

    蒋涛; 任先军; 王卫东; 初同伟; 李长青; 阴洪; 石泽刚

    2015-01-01

    目的 探讨O-arm导航辅助下胸腰椎椎弓根螺钉置入的准确性和可靠性.方法 回顾性分析2014年3-10月收治的75例实施胸腰椎椎弓根螺钉固定术患者,32例采用O-arm导航辅助置钉(导航组),43例采用C形臂X线机透视辅助下徒手置钉(透视组),术后行X线片、CT扫描检查,比较两组螺钉置入的准确性,评价导航组术中导航和术后CT扫描的矢状位和轴位图像中螺钉置入角度的一致性.结果 透视组共置入206枚椎弓根螺钉,一次性置钉成功率为93.2%,置钉准确率为90.8%(一类),1枚三类螺钉导致L3神经根刺激症状.导航组共置入226枚椎弓根螺钉,一次性置钉成功率为100%,置钉准确率为96.9%(一类),无三类螺钉,而在术中导航和术后CT扫描的矢状位和轴位图像中,螺钉置入角度差异无统计学意义(P>0.05).结论 O-arm导航系统可以提供高清晰度导航图像并实现高精确度导航操作,有效提高胸腰椎椎弓根螺钉置入的准确性,具有良好的可靠性.%Objective To evaluate the accuracy and reliability of O-arm-based thoracolumbar pedicle screw installation.Methods A retrospective review was conducted on 75 patients who had undergone thoracolumbar pedicle screw fixation assisted with O-arm navigation (navigation group,n =32) and C-arm fluoroscopy (fluoroscopy group,n =43) from March to October 2014.All the patients were assessed with X-ray and CT images after operation.Accuracy of screw installation in both groups was compared.In navigation group,screw directions were measured on the sagittal and axial images of intraoperative navigation and post-operative CT scanning to evaluate the concordance.Results In fluoroscopy group,a total of 206 pedicle screws were placed with the one-time success rate of 93.2% and accuracy of 90.8% for screw placement,and one misplaced screw (grade llⅢ) led to L3 nerve root symptom.In navigation group,a total of 226 pedicle screws were placed with

  5. Quantum corrections for Boltzmann equation

    Institute of Scientific and Technical Information of China (English)

    M.; Levy; PETER

    2008-01-01

    We present the lowest order quantum correction to the semiclassical Boltzmann distribution function,and the equation satisfied by this correction is given. Our equation for the quantum correction is obtained from the conventional quantum Boltzmann equation by explicitly expressing the Planck constant in the gradient approximation,and the quantum Wigner distribution function is expanded in pow-ers of Planck constant,too. The negative quantum correlation in the Wigner dis-tribution function which is just the quantum correction terms is naturally singled out,thus obviating the need for the Husimi’s coarse grain averaging that is usually done to remove the negative quantum part of the Wigner distribution function. We also discuss the classical limit of quantum thermodynamic entropy in the above framework.

  6. Dispersion based beam tilt correction

    CERN Document Server

    Guetg, Marc W; Prat, Eduard; Reiche, Sven

    2013-01-01

    In Free Electron Lasers (FEL), a transverse centroid misalignment of longitudinal slices in an electron bunch reduces the effective overlap between radiation field and electron bunch and therefore the FEL performance. The dominant sources of slice misalignments for FELs are the incoherent and coherent synchrotron radiation within bunch compressors as well as transverse wake fields in the accelerating cavities. This is of particular importance for over-compression which is required for one of the key operation modes for the SwissFEL planned at the Paul Scherrer Institute. The centroid shift is corrected using corrector magnets in dispersive sections, e.g. the bunch compressors. First and second order corrections are achieved by pairs of sextupole and quadrupole magnets in the horizontal plane while skew quadrupoles correct to first order in the vertical plane. Simulations and measurements at the SwissFEL Injector Test Facility are done to investigate the proposed correction scheme for SwissFEL. This paper pres...

  7. Spelling Correction in Agglutinative Languages

    CERN Document Server

    Oflazer, K

    1994-01-01

    This paper presents an approach to spelling correction in agglutinative languages that is based on two-level morphology and a dynamic programming based search algorithm. Spelling correction in agglutinative languages is significantly different than in languages like English. The concept of a word in such languages is much wider that the entries found in a dictionary, owing to {}~productive word formation by derivational and inflectional affixations. After an overview of certain issues and relevant mathematical preliminaries, we formally present the problem and our solution. We then present results from our experiments with spelling correction in Turkish, a Ural--Altaic agglutinative language. Our results indicate that we can find the intended correct word in 95\\% of the cases and offer it as the first candidate in 74\\% of the cases, when the edit distance is 1.

  8. Multipole correction in large synchrotrons

    International Nuclear Information System (INIS)

    A new method of correcting dynamic nonlinearities due to the multipole content of a synchrotron such as the Superconducting Super Collider is discussed. The method uses lumped multipole elements placed at the center (C) of the accelerator half-cells as well as elements near the focusing (F) and defocusing (D) quads. In a first approximation, the corrector strengths follow Simpson's Rule. Correction of second-order sextupole nonlinearities may also be obtained with the F, C, and D octupoles. Correction of nonlinearities by about three orders of magnitude are obtained, and simple solutions to a fundamental problem in synchrotrons are demonstrated. Applications to the CERN Large Hadron Collider and lower energy machines, as well as extensions for quadrupole correction, are also discussed

  9. Radiative corrections to Bose condensation

    Energy Technology Data Exchange (ETDEWEB)

    Gonzalez, A. (Academia de Ciencias de Cuba, La Habana. Inst. de Matematica, Cibernetica y Computacion)

    1985-04-01

    The Bose condensation of the scalar field in a theory behaving in the Coleman-Weinberg mode is considered. The effective potential of the model is computed within the semiclassical approximation in a dimensional regularization scheme. Radiative corrections are shown to introduce certain ..mu..-dependent ultraviolet divergences in the effective potential coming from the Many-Particle theory. The weight of radiative corrections in the dynamics of the system is strongly modified by the charge density.

  10. Colour correction for panoramic imaging

    OpenAIRE

    Tian, Gui Yun; Gledhill, Duke; Taylor, D.

    2002-01-01

    This paper reports the problem of colour distortion in panoramic imaging. Particularly when image mosaicing is used for panoramic imaging, the images are captured under different lighting conditions and viewpoints. The paper analyses several linear approaches for their colour transform and mapping. A new approach of colour histogram based colour correction is provided, which is robust to image capturing conditions such as viewpoints and scaling. The procedure for the colour correction is intr...

  11. Finite Size Corrections for Dimers

    CERN Document Server

    Nigro, Alessandro

    2012-01-01

    In this paper we derive the finite size corrections to the energy eigenvalues of the energy for 2D dimers on a square lattice. These finite size corrections, as in the case of Critical Dense Polymers, are proportional to the eigenvalues of the Local Integrals of Motion of Bazhanov Lukyanov and Zamolodchikov for central charge $c=-2$. This sheds more light on the status of the Dimer model as a conformal field theory with this value of the certral charge.

  12. Dialectical nursing of abdominal distension and constipation in patients with thoracolumbar fractures%辨证施护对预防胸腰椎骨折患者腹胀便秘的效果观察

    Institute of Scientific and Technical Information of China (English)

    顾爱焕

    2012-01-01

    目的 探讨辨证施护对胸腰椎骨折患者腹胀、便秘的效果.方法 将120例胸腰椎骨折患者随机分为对照组(60例)和观察组(60例);对照组实施骨科常规护理,便秘时给予开塞露40mL塞肛;观察组在常规护理的基础上作辨证施护.比较两组疗效.结果 观察组患者腹胀、便秘发生率为25.00%(15例),明显低于对照组56.67%(34例),观察组腹胀、便秘发生率明显低于对照组(x2=6.719,P< 0.05).结论 通过对便秘的病因分析,并对证护理,能使护理工作达到事半功倍的效果.%Objective To observe the effect of dialectical nursing on ahdominal distension and constipation in patients with thoracolumbar fractures. Method 120 patients with thoracolumbar fractures were randomly divided into therapeutic group and control group in equal number. The control group received the routine orthopedics nursing care, with glycerin enema (40 mL) applied into anus at abdominal distension and constipation. The therapeutic group received dialectical nursing besides routine nursing. The curative effects were compared between the two groups. Results In the therapeutic group, the incidence of abdominal distension and constipation was 25.00% and that in the control group was 56.67%. There was significant difference between the two groups (x2 = 6.719, P< 0.05). Conclusion The dialectical nursing based on analyses of etiological factors may be effective.

  13. Using neo-spinal surgery-preliminary positioning system for thoracolumbar diseases%新型脊柱术前节段定位系统在胸腰椎疾病中的应用

    Institute of Scientific and Technical Information of China (English)

    王小健; 苏云星; 常峰

    2015-01-01

    目的:利用新型脊柱术前定位系统治疗胸腰椎疾病,观察其临床应用效果。方法自2014年1月至8月我院骨科使用该系统诊治胸腰椎疾病患者共28例,同时期不使用该装置进行手术55例,从平均手术时间、平均暴露每椎节的皮肤切口长度、平均术中应用动态X线机的次数、术中出现的定位错误等方面进行统计分析。结果使用该系统组28例患者未出现定位错误等情况,在手术时间、减小切口长度、减少承受放射剂量等方面均优于对照组,且该系统操作简单。结论使用脊柱术前椎体定位系统在术中能准确定位脊柱节段,可以向临床推广。%Objective To use neo-spinal surgery-preliminary positioning system for the treatment of thora-columbar diseases, and to determine its clinical effects. Methods A total of 28 patients with thoracolumbar diseases underwent the neo-spinal surgery-preliminary positioning system between January 2014 and August 2014 in the De-partment of Orthopaedics of our hospital. A contemporary cohort of 55 cases did not use the system. The mean opera-tion time, mean length of skin incision of the exposed vertebral section, mean frequency of using the dynamic X-ray machine during the operation, and intraoperative positioning errors were statistically analyzed. Results No position-ing errors were found in 28 patients using neo-spinal surgery-preliminary positioning system. The operation time, de-creased incision length, and decreased radiation dose in the neo-spinal surgery-preliminary positioning system group were better than those in the control group. The operation of the neo-spinal surgery-preliminary positioning system is simple. Conclusion Using spinal surgery-preliminary positioning system can accurately position spinal segment, which justifies widespread use in clinical practice.

  14. 胸腰椎骨折内固定方法应用的比较分析%The Comparison of Application about Internal Fixation Method Applied to Thoracolumbar Fracture

    Institute of Scientific and Technical Information of China (English)

    王兴水

    2013-01-01

    Objective:To compare and analysis the application effect of internal fixation method applied to thoracolumbar fracture.Method:The 82 patients were surgical treatment respectively with internal fixation of posterior(internal fixation of decompression from the posterior called Harrington and internal fixation from the posterior through the pedicle of vertebral arch called AF system)and internal fixation from the front path called Kaneda,then compare the the improvement about cobb’s angle of injured spinal cord and the height of front and rear edge、the changes of Frankel classification and the adverse reaction case after treatment.Result:The effect of AF was better than Harrington and Kaneda on cobb’s angle and the height of front and rear edge;The adverse reaction case of Harrington and AF was less than Kaneda.Conclusion:Medical clinical should choose the right way of internal fixation when treatment with thoracolumbar fracture,internal fixation of decompression from the posterior can be considered first in the feasible premise.%  目的:比较分析胸腰椎骨折内固定方法的应用效果。方法:对82例患者分别采用后路内固定(后路减压式内固定方式Harrington和后路经椎弓根内固定AF系统)及前路内固定Kaneda方式进行手术治疗,比较治疗后伤椎Cobb’s角和前、后缘高度改善情况,以及Frankel分级变化情况、并发症发生情况。结果:Cobb’s角和前、后缘高度改善情况及Frankel分级上,AF较之Harrington与Kaneda效果更佳;另外,Harrington与AF较之Kaneda,并发症发生率相对更少。结论:治疗胸腰椎骨折时,应根据患者的具体情况选择合适的内固定方式,后路方式可行的前提下可优先考虑采用。

  15. Brachial plexus palsy caused by halo traction before posterior correction in patients with severe scoliosis

    Institute of Scientific and Technical Information of China (English)

    QIAN Bang-ping; QIU Yong; WANG Bin; YU Yang; ZHU Ze-zhang

    2007-01-01

    Objective: To explore the clinical features and treatment results of brachial plexus palsy caused by halo traction before posterior correction in patients with severe scoliosis.Methods: A total of 300 cases of severe scoliosis received halo traction before posterior correction in our department from July 1997 to November 2004. Among them, 7 cases were complicated with brachial plexus palsy.The average Cobb angle was 110° (range, 90°-135°).Diagnoses were made as idiopathic scoliosis in 1 case,congenital scoliosis in 3 cases, and neuromuscular scoliosis in 3 cases. Additionally, diastematomyelia and tethered cord syndrome were found in 3 cases and thoracolumbar kyphosis in 2 cases. Weight of traction was immediately reduced when the patient developed any abnormal neurological symptoms in the upper extremity, and rehabilitation training was undertaken. Simultaneously,neurotrophic pharmacotherapy was applied, and the neurological function restoration of the upper limbs and the recovery time were documented.Results: Traction was used for an average of 3.5 weeks (range, 2-6 weeks) before spinal fusion for these 7 patients. The average traction weight was 8 kg, which was 19% on average (range, 13%-26%) of the average body weight (40.2 kg). These 7 patients had long and thin body configuration with a mean height of 175 cm. The duration between symptoms of brachial plexus paralysis and the diagnosis was 1-3 hours. All of these 7 patients presented various degrees of numbness in the ulnar side of the hand and forearm. Median nerve paresis was found in 3 cases and ulnar nerve paresis in 4 cases. Complete recovery of the neurological function had been achieved by the end of three months.Conclusions: The clinical features of brachial plexus palsy caused by halo traction include median nerve paresis,ulnar nerve paralysis, and numbness in the ulnar side of the hand and forearm, which may be due to the injury of the inferior part of the brachial plexus, i.e. , damage of Cs and

  16. 42 CFR 460.194 - Corrective action.

    Science.gov (United States)

    2010-10-01

    ... 42 Public Health 4 2010-10-01 2010-10-01 false Corrective action. 460.194 Section 460.194 Public...) Federal/State Monitoring § 460.194 Corrective action. (a) A PACE organization must take action to correct... corrective actions. (c) Failure to correct deficiencies may result in sanctions or termination, as...

  17. Gravitomagnetic corrections on gravitational waves

    CERN Document Server

    Capozziello, S; Forte, L; Garufi, F; Milano, L

    2009-01-01

    Gravitational waveforms and production could be considerably affected by gravitomagnetic corrections considered in relativistic theory of orbits. Beside the standard periastron effect of General Relativity, new nutation effects come out when c^{-3} corrections are taken into account. Such corrections emerge as soon as matter-current densities and vector gravitational potentials cannot be discarded into dynamics. We study the gravitational waves emitted through the capture, in the gravitational field of massive binary systems (e.g. a very massive black hole on which a stellar object is inspiralling) via the quadrupole approximation, considering precession and nutation effects. We present a numerical study to obtain the gravitational wave luminosity, the total energy output and the gravitational radiation amplitude. From a crude estimate of the expected number of events towards peculiar targets (e.g. globular clusters) and in particular, the rate of events per year for dense stellar clusters at the Galactic Cen...

  18. Delegation in Correctional Nursing Practice.

    Science.gov (United States)

    Tompkins, Frances

    2016-07-01

    Correctional nurses face daily challenges as a result of their work environment. Common challenges include availability of resources for appropriate care delivery, negotiating with custody staff for access to patients, adherence to scope of practice standards, and working with a varied staffing mix. Professional correctional nurses must consider the educational backgrounds and competency of other nurses and assistive personnel in planning for care delivery. Budgetary constraints and varied staff preparation can be a challenge for the professional nurse. Adequate care planning requires understanding the educational level and competency of licensed and unlicensed staff. Delegation is the process of assessing patient needs and transferring responsibility for care to appropriately educated and competent staff. Correctional nurses can benefit from increased knowledge about delegation. PMID:27302707

  19. Local Correction of Boolean Functions

    CERN Document Server

    Alon, Noga

    2011-01-01

    A Boolean function f over n variables is said to be q-locally correctable if, given a black-box access to a function g which is "close" to an isomorphism f_sigma of f, we can compute f_sigma(x) for any x in Z_2^n with good probability using q queries to g. We observe that any k-junta, that is, any function which depends only on k of its input variables, is O(2^k)-locally correctable. Moreover, we show that there are examples where this is essentially best possible, and locally correcting some k-juntas requires a number of queries which is exponential in k. These examples, however, are far from being typical, and indeed we prove that for almost every k-junta, O(k log k) queries suffice.

  20. When correction turns positive: processing corrective prosody in Dutch.

    Directory of Open Access Journals (Sweden)

    Diana V Dimitrova

    Full Text Available Current research on spoken language does not provide a consistent picture as to whether prosody, the melody and rhythm of speech, conveys a specific meaning. Perception studies show that English listeners assign meaning to prosodic patterns, and, for instance, associate some accents with contrast, whereas Dutch listeners behave more controversially. In two ERP studies we tested how Dutch listeners process words carrying two types of accents, which either provided new information (new information accents or corrected information (corrective accents, both in single sentences (experiment 1 and after corrective and new information questions (experiment 2. In both experiments corrective accents elicited a sustained positivity as compared to new information accents, which started earlier in context than in single sentences. The positivity was not modulated by the nature of the preceding question, suggesting that the underlying neural mechanism likely reflects the construction of an interpretation to the accented word, either by identifying an alternative in context or by inferring it when no context is present. Our experimental results provide strong evidence for inferential processes related to prosodic contours in Dutch.

  1. When correction turns positive: processing corrective prosody in Dutch.

    Science.gov (United States)

    Dimitrova, Diana V; Stowe, Laurie A; Hoeks, John C J

    2015-01-01

    Current research on spoken language does not provide a consistent picture as to whether prosody, the melody and rhythm of speech, conveys a specific meaning. Perception studies show that English listeners assign meaning to prosodic patterns, and, for instance, associate some accents with contrast, whereas Dutch listeners behave more controversially. In two ERP studies we tested how Dutch listeners process words carrying two types of accents, which either provided new information (new information accents) or corrected information (corrective accents), both in single sentences (experiment 1) and after corrective and new information questions (experiment 2). In both experiments corrective accents elicited a sustained positivity as compared to new information accents, which started earlier in context than in single sentences. The positivity was not modulated by the nature of the preceding question, suggesting that the underlying neural mechanism likely reflects the construction of an interpretation to the accented word, either by identifying an alternative in context or by inferring it when no context is present. Our experimental results provide strong evidence for inferential processes related to prosodic contours in Dutch.

  2. 胸腰椎骨折术后切口感染的相关危险因素及预防对策%Risk factors of incision infection after thoracolumbar fracture surgery and preventive measures

    Institute of Scientific and Technical Information of China (English)

    徐强; 李海燕; 林云琴; 朱让腾; 应有荣; 管敏昌

    2016-01-01

    目的 探讨胸腰椎骨折术后切口感染的相关危险因素,并提出相应预防对策.方法 回顾性分析2011年4月至2014年4月在浙江省台州恩泽医疗中心(集团)路桥医院行胸腰椎骨折手术974例患者的病历资料,其中并发切口感染21例.对患者年龄、文化水平、手术失血量、手术方式、手术时间、住院时间、基础疾病、开放性伤口、内置物、体重指数、术前抗菌药物应用情况和主刀医师年资等因素与胸腰椎骨折术后切口感染进行相关性分析.结果 单因素Logistic回归分析显示,影响切口感染的相关因素有年龄、手术失血量、手术时间、住院时间、基础疾病、营养状态、开放性伤口、内置物、体重指数和术前抗菌药物应用情况(均P<0.05);多因素Logistic回归分析显示,年龄>35岁、手术时间>60 min、住院时间>15 d、手术失血量> 500 ml、有基础疾病、营养状态差、开放性伤口、体重指数>25 kg/m2、内置物、术前未应用抗菌药物是胸腰椎骨折术后切口感染发生的危险因素(均P <0.05).结论 年龄>35岁、手术时间>60 min、住院时间>15 d、手术失血量>500 ml、有基础疾病、营养状态差、开放性伤口、体重指数>25 kg/m2、内置物、术前未应用抗菌药物是胸腰椎骨折术后切口感染的主要危险因素,应针对各危险因素采取相应预防措施.%Objective To investigate the related risk factors of incision infection after thoracolumbar fracture surgery and preventive measures.Methods Nine hundred and seventy four patients who underwent thoracolumbar fracture surgery from April 2011 to April 2014 were retrospectively analyzed,among them,21 cases were complicated with incision infection.The relative factors,including age,educational level,operation blood loss,operation mode,operation duration,hospitalization duration,underlying diseases,open wounds,implants,body mass index

  3. Clinical observation of posterior internal fixation with vertebral pedicle screw and rod system on thoracolumbar spine fractures%椎弓根钉棒系统在胸腰椎骨折的疗效分析

    Institute of Scientific and Technical Information of China (English)

    黎华茂; 李敬中; 向峥; 林晓岗

    2012-01-01

    Objective To observe the clinical efficacy of posterior internal fixation of vertebral pedicle screw and rod system for thoracolumbar spine fractures. Methods Totally 59 patients with thoracic or lumbar vertebral fractures were treated with internal fixation of vertebral pedicle screw and rod system. The Frankel scale combined with X ray and CT images was used for the judgment of efficacy. Results Radiographic parameters were significantly improved after the experiment, the Frankel degree of cases with nerve injury symptoms was improved 2-4 degrees after surgery. Conclusions Internal fixation of vertebral pedicle screw and rod system is efficient for thoraco lumbar spine fractures.%目的 观察椎弓根钉棒系统内固定治疗胸腰椎骨折的临床疗效.方法 应用椎弓根钉棒系统内固定治疗胸腰椎骨折59例,采用Frankel分级结合X线片、CT影像表现判断疗效.结果 术后各项影像学指标均有明显改善,患者术后神经功能Frankel分级大多数都有2~4级提高.结论 椎弓根钉棒系统内固定是治疗胸腰椎骨折的一种有效方法,值得临床推广应用.

  4. 浅谈胸腰椎骨折治疗过程中的医患沟通%Communication Methods and Skills between Doctors and Patients in the Treatment of Thoracolumbar Fractures

    Institute of Scientific and Technical Information of China (English)

    王洪伟; 李长青; 周跃

    2011-01-01

    Patients with thoracolumbar fractures have different psychological features in the stages of before treatment, the stage of treatment, the stage of rehabilitation and the stage of post - discharge.In order to relieve patients’negative psychological reaction during the whole treatment process and promote patients’ physiologic and psychological rehabilitation, the health care workers should adopt different communication methods and skills for different individuals according to their psychological features.%胸腰椎骨折患者在治疗前、治疗中、康复期、出院后等不同阶段有不同的心理特点,在临床上,有针对性地运用一些沟通方式和技巧与患者进行沟通,可减轻患者在整个治疗期间的消极心理反应,减少医疗纠纷,使患者身体、心理得到康复.

  5. Correction

    Science.gov (United States)

    2016-09-01

    The feature article “Neutrons for new drugs” (August pp26–29) stated that neutron crystallography was used to determine the structures of “wellknown complex biological molecules such as lysine, insulin and trypsin”.

  6. Correction

    CERN Multimedia

    2007-01-01

    From left to right: Luis, Carmen, Mario, Christian and José listening to speeches by theorists Alvaro De Rújula and Luis Alvarez-Gaumé (right) at their farewell gathering on 15 May.We unfortunately cut out a part of the "Word of thanks" from the team retiring from Restaurant No. 1. The complete message is published below: Dear friends, You are the true "nucleus" of CERN. Every member of this extraordinary human mosaic will always remain in our affections and in our thoughts. We have all been very touched by your spontaneous generosity. Arrivederci, Mario Au revoir,Christian Hasta Siempre Carmen, José and Luis PS: Lots of love to the theory team and to the hidden organisers. So long!

  7. Correction.

    Science.gov (United States)

    1991-11-29

    Because of a production error, the photographs of pierre Chambon and Harald zur Hausen, which appeared on pages 1116 and 1117 of last week's issue (22 November), were transposed. Here's what you should have seen: Chambon is on the left, zur Hausen on the right.

  8. Correction

    Institute of Scientific and Technical Information of China (English)

    2015-01-01

    <正>The paper"A comparative study on the transplantation of different concentrations of human umbilical mesenchymal cells into diabetic rat"DOI:10.3980/j.issn.2222-3959.2015.02.08 was published in No.2 issue of IJO on 18th April.Jia-Hui Kong,Dan Zheng,Song Chen,Hong-Tao Duan,Yue-Xin Wang,Meng Dong,Jian Song Clinical College of Ophthalmology,Tianjin Medical University,Tianjin Eye Hospital,Tianjin Institute of Ophthalmology,

  9. The correct "ball bearings" data.

    Science.gov (United States)

    Caroni, C

    2002-12-01

    The famous data on fatigue failure times of ball bearings have been quoted incorrectly from Lieblein and Zelen's original paper. The correct data include censored values, as well as non-fatigue failures that must be handled appropriately. They could be described by a mixture of Weibull distributions, corresponding to different modes of failure.

  10. Quantum Convolutional Error Correction Codes

    OpenAIRE

    Chau, H. F.

    1998-01-01

    I report two general methods to construct quantum convolutional codes for quantum registers with internal $N$ states. Using one of these methods, I construct a quantum convolutional code of rate 1/4 which is able to correct one general quantum error for every eight consecutive quantum registers.

  11. CORRECTIVE ACTION IN CAR MANUFACTURING

    Directory of Open Access Journals (Sweden)

    H. Rohne

    2012-01-01

    Full Text Available

    ENGLISH ABSTRACT: In this paper the important .issues involved in successfully implementing corrective action systems in quality management are discussed. The work is based on experience in implementing and operating such a system in an automotive manufacturing enterprise in South Africa. The core of a corrective action system is good documentation, supported by a computerised information system. Secondly, a systematic problem solving methodology is essential to resolve the quality related problems identified by the system. In the following paragraphs the general corrective action process is discussed and the elements of a corrective action system are identified, followed by a more detailed discussion of each element. Finally specific results from the application are discussed.

    AFRIKAANSE OPSOMMING: Belangrike oorwegings by die suksesvolle implementering van korrektiewe aksie stelsels in gehaltebestuur word in hierdie artikel bespreek. Die werk is gebaseer op ondervinding in die implementering en bedryf van so 'n stelsel by 'n motorvervaardiger in Suid Afrika. Die kern van 'n korrektiewe aksie stelsel is goeie dokumentering, gesteun deur 'n gerekenariseerde inligtingstelsel. Tweedens is 'n sistematiese probleemoplossings rnetodologie nodig om die gehalte verwante probleme wat die stelsel identifiseer aan te spreek. In die volgende paragrawe word die algemene korrektiewe aksie proses bespreek en die elemente van die korrektiewe aksie stelsel geidentifiseer. Elke element word dan in meer besonderhede bespreek. Ten slotte word spesifieke resultate van die toepassing kortliks behandel.

  12. Multilingual text induced spelling correction

    NARCIS (Netherlands)

    Reynaert, M.W.C.

    2004-01-01

    We present TISC, a multilingual, language-independent and context-sensitive spelling checking and correction system designed to facilitate the automatic removal of non-word spelling errors in large corpora. Its lexicon is derived from raw text corpora, without supervision, and contains word unigrams

  13. Bone-setting manipulation combined with percutaneous vertebroplasty using polymethylmethacrylate for treatment of osteoporotic thoracolumbar vertebral compression fractures%经皮聚甲基丙烯酸甲酯骨水泥椎体成形结合手法牵引复位治疗骨质疏松性胸腰椎压缩骨折

    Institute of Scientific and Technical Information of China (English)

    周英杰; 赵刚; 李森; 郑怀亮; 赵鹏飞

    2012-01-01

    BACKGROUND: Percutaneous vertebroplasty technique and kyphosis vertebroplasty have been more widely used in clinic,which is considered as the ideal treatment for osteoporotic thoracolumbar vertebral compression fractures.OBJECTIVE: To observe the clinical effects of bone-setting manipulation combined with percutaneous vertebroplasty versuspercutaneous kyphosis vertebroplasty on osteoporotic thoracolumbar vertebral compression fractures.METHODS: Totally 59 cases with osteoporotic thoracolumbar vertebral compression fractures were divided into A and B group: Agroup was treated with bone-setting manipulation combined with percutaneous vertebroplasty, including 38 cases; B groupreceived treatment with percutaneous kyphosis vertebroplasty, including 21 cases. The clinical therapeutic effects of the twogroups were compared by observing the changes in anterior vertebral height, central vertebral height, visual analogue scalescoring, Cobb angle, fees and so on.RESULTS AND CONCLUSION: Anterior vertebral height, central vertebral height, visual analogue scale scoring, Cobb angle inthe two groups were significantly improved after treatment (P 0.05). The fees in the A group were significantly lower than those in the B group (P 0.05).手法结合经皮椎体成形组患者手术费用显著低于经皮后凸椎体成形组(P < 0.05).表明手法牵引复位结合经皮椎体成形治疗骨质疏松性椎体压缩骨折症状、体征均有显著疗效,并能节约手术费用,可以作为老年患者骨质疏松性椎体压缩骨折的首选治疗方法.

  14. 聚焦线圈对管道爬行器X射线管电子束轨迹的纠正作用%Research of Gathering Focus Wire for Rectifying Electron Locus Based on the Focusing Coil for X Ray Tube Electron Beam Trajectory Correction Technology

    Institute of Scientific and Technical Information of China (English)

    张金光; 李冬雪; 马春青

    2012-01-01

    X ray crawler in long distance pipeline girth welding seam X-ray detection is widely used. During the application in the second west to East Gas Pipeline Project of large diameter pipeline, partial target phenomenon was observed for circumferential conical target X ray generator, causing the circumferential X ray intensity inhomogeneity and film densiting difference. To solve this problem, the focusing coil was used in the circumferential conical target X ray generator to correct the trajectory ofeleetron beam. Through the analysis of the experiment, circumferential field intensity reached the purpose of uniform. Application in the follow-up of the long distance pipeline construction in radiographic testing received good results.%X射线管道爬行器在长输管道环焊缝射线检测中得到越来越广泛的应用。其在西气东输二线大口径长输管道的应用中,出现周向锥靶X射线发生器偏靶现象,致使周向X射线场强不均匀,拍摄的底片黑度差异大。对此提出了将聚焦线圈应用在周向锥靶X射线发生器中,以纠正电子柬轨迹的方法。通过分析,试验达到了周向上场强均匀的目的。在后续的长输管道射线检测应用施工中收到良好效果。

  15. GSS pedicle screw fixation combined with two-stage bone cement perfusion for thoracolumbar fractures%GSS椎弓根螺钉内固定并二期伤椎骨水泥灌注治疗胸腰椎骨折

    Institute of Scientific and Technical Information of China (English)

    宋洁富; 李利军; 常峰; 荆志振

    2012-01-01

    Objective To explore the efficacy and safety of surgical treatment of thoracolumbar fractures by GSS pedicle screw fixation combined with two-stage bone cement perfusion. Methods From March 2005 to October 2010, 31 patients with thoracolumbar bursting fractures were treated with posterior GSS pedicle screw fixation. The patients were reviewed by X-ray and CT scan 3-18 months postoperatively. Once "eggshell phenomenon" appeared, bone cement was used in the injured vertebral body before removing the fixators. Injured vertebral height and Cobb' s angle were measured preoperatively, postoperatively and at the final follow-up. Results No leakage of bone cement happened in all the patients. The internal fixators were removed 12-18 months postoperatively. Then the patients were followed up for 1-3 years. Fractured vertebral height and Cobb' s angle were significantly improved after surgery. Conclusion GSS combined with two-stage bone cement perfusion for thoracolumbar fractures can achieve a good therapeutic effect. It can be taken as an attempt at the treatment of thoracolumbar fractures.%目的 探讨GSS椎弓根螺钉内固定结合二期伤椎骨水泥灌注治疗胸腰椎骨折的有效性和安全性.方法 2005年3月~2010年10月共31例胸腰椎爆裂性骨折患者行后路GSS椎弓根螺钉内固定治疗,术后3~18个月根据X线及CT复查情况,出现"蛋壳现象"的患者在取出内固定前行伤椎骨水泥灌注,记录术前、术后及末次随访时的伤椎高度及X线片测量的Cobb角角度.结果 本组患者均未出现骨水泥渗漏,术后12~18个月取出内固定后再随访1~3年.术后伤椎椎体高度及Cobb角与术前相比有明显改善.结论 GSS椎弓根螺钉内固定结合二期伤椎骨水泥灌注治疗胸腰椎骨折可达到良好的治疗效果,可作为治疗胸腰椎骨折的新的尝试.

  16. Motion-corrected Fourier ptychography

    CERN Document Server

    Bian, Liheng; Guo, Kaikai; Suo, Jinli; Yang, Changhuei; Chen, Feng; Dai, Qionghai

    2016-01-01

    Fourier ptychography (FP) is a recently proposed computational imaging technique for high space-bandwidth product imaging. In real setups such as endoscope and transmission electron microscope, the common sample motion largely degrades the FP reconstruction and limits its practicability. In this paper, we propose a novel FP reconstruction method to efficiently correct for unknown sample motion. Specifically, we adaptively update the sample's Fourier spectrum from low spatial-frequency regions towards high spatial-frequency ones, with an additional motion recovery and phase-offset compensation procedure for each sub-spectrum. Benefiting from the phase retrieval redundancy theory, the required large overlap between adjacent sub-spectra offers an accurate guide for successful motion recovery. Experimental results on both simulated data and real captured data show that the proposed method can correct for unknown sample motion with its standard deviation being up to 10% of the field-of-view scale. We have released...

  17. Proximity effect correction sensitivity analysis

    Science.gov (United States)

    Zepka, Alex; Zimmermann, Rainer; Hoppe, Wolfgang; Schulz, Martin

    2010-05-01

    Determining the quality of a proximity effect correction (PEC) is often done via 1-dimensional measurements such as: CD deviations from target, corner rounding, or line-end shortening. An alternative approach would compare the entire perimeter of the exposed shape and its original design. Unfortunately, this is not a viable solution as there is a practical limit to the number of metrology measurements that can be done in a reasonable amount of time. In this paper we make use of simulated results and introduce a method which may be considered complementary to the standard way of PEC qualification. It compares simulated contours with the target layout via a Boolean XOR operation with the area of the XOR differences providing a direct measure of how close a corrected layout approximates the target.

  18. Video Error Correction Using Steganography

    Directory of Open Access Journals (Sweden)

    Robie David L

    2002-01-01

    Full Text Available The transmission of any data is always subject to corruption due to errors, but video transmission, because of its real time nature must deal with these errors without retransmission of the corrupted data. The error can be handled using forward error correction in the encoder or error concealment techniques in the decoder. This MPEG-2 compliant codec uses data hiding to transmit error correction information and several error concealment techniques in the decoder. The decoder resynchronizes more quickly with fewer errors than traditional resynchronization techniques. It also allows for perfect recovery of differentially encoded DCT-DC components and motion vectors. This provides for a much higher quality picture in an error-prone environment while creating an almost imperceptible degradation of the picture in an error-free environment.

  19. Personalized recommendation with corrected similarity

    International Nuclear Information System (INIS)

    Personalized recommendation has attracted a surge of interdisciplinary research. Especially, similarity-based methods in applications of real recommendation systems have achieved great success. However, the computations of similarities are overestimated or underestimated, in particular because of the defective strategy of unidirectional similarity estimation. In this paper, we solve this drawback by leveraging mutual correction of forward and backward similarity estimations, and propose a new personalized recommendation index, i.e., corrected similarity based inference (CSI). Through extensive experiments on four benchmark datasets, the results show a greater improvement of CSI in comparison with these mainstream baselines. And a detailed analysis is presented to unveil and understand the origin of such difference between CSI and mainstream indices. (paper)

  20. Unitarity Corrections and Structure Functions

    CERN Document Server

    Gay-Ducati, M B

    2002-01-01

    We have studied the color dipole picture for the description of the deep inelastic process, mainly the structure functions which are driven directly by the gluon distribution. Estimates for those functions are obtained using the effective dipole cross section given by the Glauber-Mueller approach in QCD, encoding the corrections due to the unitarity effects associated with the saturation phenomenon. Frame invariance is verified in the calculations of the observables when analysing the experimental data.

  1. Interaction and self-correction

    DEFF Research Database (Denmark)

    Satne, Glenda Lucila

    2014-01-01

    In this paper, I address the question of how to account for the normative dimension involved in conceptual competence in a naturalistic framework. First, I present what I call the naturalist challenge (NC), referring to both the phylogenetic and ontogenetic dimensions of conceptual possession and......-correction that I develop with the help of the interactionist theory of mutual understanding arising from recent developments in phenomenology and developmental psychology. © 2014 Satne....

  2. EPS Young Physicist Prize - CORRECTION

    CERN Document Server

    2009-01-01

    The original text for the article 'Prizes aplenty in Krakow' in Bulletin 30-31 assigned the award of the EPS HEPP Young Physicist Prize to Maurizio Pierini. In fact he shared the prize with Niki Saoulidou of Fermilab, who was rewarded for her contribution to neutrino physics, as the article now correctly indicates. We apologise for not having named Niki Saoulidou in the original article.

  3. Holographic superconductors with Weyl corrections

    Science.gov (United States)

    Momeni, Davood; Raza, Muhammad; Myrzakulov, Ratbay

    2016-10-01

    A quick review on the analytical aspects of holographic superconductors (HSCs) with Weyl corrections has been presented. Mainly, we focus on matching method and variational approaches. Different types of such HSC have been investigated — s-wave, p-wave and Stúckelberg ones. We also review the fundamental construction of a p-wave type, in which the non-Abelian gauge field is coupled to the Weyl tensor. The results are compared from numerics to analytical results.

  4. The fallacies of QT correction

    OpenAIRE

    Lokhandwala, Yash; Toal, SC

    2003-01-01

    Not to correct QT, but how to, that is the question”. The QT interval is a reflection of the action potential in the cardiac cells. Homogenous or heterogenous changes in the action potential duration lead to alteration of QT interval (in addition to morphological changes of T & U waves) 1. Such changes can be due to change in heart rate & autonomic tone. They can also be markers of abnormal repolarization, depolarization or both as a result of electrolyte disturbances, cardiac diseases, drug...

  5. [Orthognathic surgery: corrective bone operations].

    Science.gov (United States)

    Reuther, J

    2000-05-01

    The article reviews the history of orthognathic surgery from the middle of the last century up to the present. Initially, mandibular osteotomies were only performed in cases of severe malformations. But during the last century a precise and standardized procedure for correction of the mandible was established. Multiple modifications allowed control of small fragments, functionally stable osteosynthesis, and finally a precise positioning of the condyle. In 1955 Obwegeser and Trauner introduced the sagittal split osteotomy by an intraoral approach. It was the final breakthrough for orthognathic surgery as a standard treatment for corrections of the mandible. Surgery of the maxilla dates back to the nineteenth century. B. von Langenbeck from Berlin is said to have performed the first Le Fort I osteotomy in 1859. After minor changes, Wassmund corrected a posttraumatic malocclusion by a Le Fort I osteotomy in 1927. But it was Axhausen who risked the total mobilization of the maxilla in 1934. By additional modifications and further refinements, Obwegeser paved the way for this approach to become a standard procedure in maxillofacial surgery. Tessier mobilized the whole midface by a Le Fort III osteotomy and showed new perspectives in the correction of severe malformations of the facial bones, creating the basis of modern craniofacial surgery. While the last 150 years were distinguished by the creation and standardization of surgical methods, the present focus lies on precise treatment planning and the consideration of functional aspects of the whole stomatognathic system. To date, 3D visualization by CT scans, stereolithographic models, and computer-aided treatment planning and simulation allow surgery of complex cases and accurate predictions of soft tissue changes.

  6. Lightweight Specifications for Parallel Correctness

    OpenAIRE

    Burnim, Jacob Samuels

    2012-01-01

    With the spread of multicore processors, it is increasingly necessaryfor programmers to write parallel software. Yet writing correctparallel software with explicit multithreading remains a difficultundertaking. Though many tools exist to help test, debug, and verifyparallel programs, such tools are often hindered by a lack of anyspecification from the programmer of the intended, correct parallelbehavior of his or her software.In this dissertation, we propose three novel lightweightspecificati...

  7. Performance of TPC crosstalk correction

    CERN Document Server

    Dydak, F; Krasnoperov, A; Nefedov, Y; Wotschack, J; Zhemchugov, A

    2004-01-01

    The performance of the CERN-Dubna-Milano (CDM) algorithm for TPC crosstalk correction is presented. The algorithm is designed to correct for uni-directional and bi-directional crosstalk, but not for self-crosstalk. It reduces at the 10% level the number of clusters, and the number of pads with a signal above threshold. Despite of dramatic effects in selected channels with complicated crosstalk patterns, the average longitudinal signal shape of a hit, and the average transverse signal shape of a cluster, are little affected by uni-directional and bi-directional crosstalk. The longitudinal signal shape of hits is understood in terms of preamplifier response, longitudinal diffusion, track inclination, and self-crosstalk. The transverse signal shape of clusters is understood in terms of the TPC's pad response function. The CDM crosstalk correction leads to an average charge decrease at the level of 15%, though with significant differences between TPC sectors. On the whole, crosstalk constitutes a relatively benig...

  8. 斑点追踪技术评价缺血心肌短轴缩短率和圆周应变%Evaluation of Regional Shortening Fraction and Circumferential Strain in Patients with Myocardial Ischemia by Speckle Tracking Imaging

    Institute of Scientific and Technical Information of China (English)

    何艳; 王东平; 陈金国; 张娜; 杨体霞; 张军; 周利民

    2012-01-01

    目的 运用斑点追踪技术(STI)测量缺血心肌的短轴缩短率和圆周应变值,探讨其在诊断心肌缺血,评价心肌功能中的应用价值.方法 对29例心肌缺血患者(冠状动脉狭窄≥75%)和28例正常对照组(冠状动脉没有狭窄)分别行超声心动图检查,采集并记录左室短轴观(二尖瓣水平)的高帧频动态二维灰阶图像,应用二维应变分析软件进行脱机分析,系统自动将左室短轴分为前间隔、前壁、侧壁、后壁、下壁、后间隔6个节段,并给出应变曲线,分别测量各节段心肌的短轴缩短率和圆周应变值.结果 正常对照组的圆周应变曲线是负向峰值曲线,短轴缩短率曲线是正向峰值曲线,整组曲线排列较整齐;而心肌缺血组的应变曲线形态不规则.心肌缺血组圆周应变和短轴缩短率均低于正常对照组,差异有统计学意义(P<0.05).结论 斑点追踪技术能对心肌的二维应变进行定量分析,为临床诊断心肌缺血,评价心肌功能提供了无创性新方法.%Objective To evaluate the clinical value of speckle tracking imaging in the measurement of regional shortening fraction and circumferential strain in patients with myocardial ischemia. Methods Twenty-nine patients with myocardial ischemia and twenty-eight healthy subjects underwent echocardiography,high frame rate two-dimensional images were recorded from the left ventricular short-axis views at the levels of mitral annulus, regional shortening fraction and circumferential strain were measured in the left ventricular short-axis views using two-dimensional strain software. Results Circumferential strain curve, regional shortening fraction curve in healthy group changed regularly, while in myocardial ischemia patients, the curve changed irregularly. Regional shortening fraction and circumferential strain in myocardial ischemia patients showed significant reduction compared with normal myocardium(P<0.05). Conclusion Speckle

  9. Design and performance test of circumferential crankle guide vane of multistage centrifugal pumps%多级离心泵圆周弯扭式导叶设计及性能试验

    Institute of Scientific and Technical Information of China (English)

    张启华; 徐燕; 施卫东; 高雄发; 马栋棋; 陆伟刚

    2013-01-01

      为开发一种紧凑式多级泵,研究配套的一种圆周弯扭式导叶,其设计思路源自扭曲离心叶轮设计方法。通过固定导叶顶端曲线,将导叶底端曲线沿圆周方向向前延伸,形成弯扭式曲面。该导叶结构具有2个优点。首先,导叶底端沿圆周向前延伸后保证了较大的喉部进水区域面积。其次,利用底端向前延伸的部分与下一个叶片的圆柱部分自然形成扩压器状的过流通道,增强了导叶的扩压能力。在二次开发技术的基础上开发出该结构的水力设计系统。利用该系统设计出多组方案,同时利用CFD计算分析,经过不同方案的比较,最终获得了优化的导叶模型,并通过样机试验验证该模型具有较好的水力性能。该设计方法将有利于多级泵的节能,同时该方法也为紧凑式多级泵开发提供了有益的参考。%To design compact multistage centrifugal pumps, a circumferential crankle guide vane was proposed to match their compact structure. The basic design principle originated from the twisted centrifugal impeller design method and the design method of this guide vane was investigated systematically. By fixing the top curve of the guide vane and extending the bottom curve forward along a circumferential direction, a crankle surface is shaped. This design method has two merits. Firstly, the bottom curve of the first guide vane is extended circumferentially forward to guarantee a large throat flow area. And secondly, a diffuser-like passage is naturally formed by the extended surface and the cylindrical surface of the next blade, which enhances its pressure recovery ability. In addition, the blade surface is divided into two segmented parts, that is, a full twisted surface and a cylindrical surface, thus the casting and molding of the guide vane is more convenient. To reduce the design cycle of the guide vane, a hydraulic design system of the circumferential crankle

  10. 超声衍射时差法检测汽水管道环焊缝根部腐蚀减薄%Time-of-Flight-Diffraction Testing of Steam and Water Piping Circumferential Weld Roots Local Wall-thinning

    Institute of Scientific and Technical Information of China (English)

    钟志民; 张维; 汪明辉

    2016-01-01

    The field feedbacks show that the industry should pay more attention to secondary loop steam and water piping circumferential weld root flow-accelerated corrosion(FAC)in Nuclear Power Plants from field feedbacks. Without effective inspection and supervision, it will lead to serious consequences such as high energy pipe leakage or rupture. The weld root Ultrasonic Time of Flight Diffraction(TOFD) inspection principle and testing results were discussed in detail. It was shown that TOFD can be applied to inspect local wall-thinning ,caused by flow-accelerated corrosion, at circumferential weld roots of secondary loop steam & water piping in nuclear power plants.%工程经验反馈表明,过往关注较少的核电站二回路汽水管道环焊缝根部由流动加速腐蚀引起的局部减薄现象应引起业界重视,如不进行有效的检测和监督,也会导致高能管道泄漏或破裂.本文重点探讨了核电站二回路汽水管道环焊缝根部局部减薄超声衍射时差法的检测原理、试验情况.结果表明,超声衍射时差法可用于检测流动加速腐蚀引起的汽水管道环焊缝根部局部减薄.

  11. 周向导波电磁超声探头(EMAT)设计与优化%Design and Optimization of Electromagnetic Acoustic Transducer (EMAT) for Guided Circumferential Wave

    Institute of Scientific and Technical Information of China (English)

    沙高峰; 蔡桂喜

    2012-01-01

    To inspect oil and gas pipelines by using SHO mode guided circumferential ultrasonic wave,a novel electromagnetic acoustic transducer (EMAT) for guided circumferential wave was designed. The EMAT has two structural features,a carbon steel sheet is on top of all the magnets and small nonmagnetic blocks are placed between adjacent magnets. To improve its transduction efficiency, ANSYS software was used to optimize some geometric parameters of EMAT. The optimal result is the carbon steel sheet should be thicker than 1 mm, and the wire spacing of the coil should be as small as possible. Experiments on a tube 200 mm in OD and 4 mm in wall thickness indicate that the EMAT optimized can excite the SHO mode guided wave effectively.%为了利用SH0模超声周向导波检测油气管道纵向裂纹,提出了一种新的周向导波电磁超声探头(EMAT)结构设计,其结构特点是磁铁顶部放置碳钢片,相邻磁铁之间放置非磁性材料片.为了提高周向导波EMAT的换能效率,采用ANSYS仿真对其结构参数进行了优化.优化的结果为:磁铁顶部应放置厚度大于1mm的碳钢片,线圈中导线间距要尽量小.在直径200 mm壁厚、4mm的管材上进行实验,结果表明,优化设计后的探头能有效地激励出周向SH0导波.

  12. 护理干预对胸腰椎骨折患者腹胀的影响分析%The effect of nursing intervention on abdominal distension of patients with thoraco-lumbar fractures

    Institute of Scientific and Technical Information of China (English)

    任晓凤; 林艳荣

    2014-01-01

    目的:研究护理干预措施对胸腰椎骨折患者腹胀的影响。方法将2011年7月至2013年10月期间我院收治的胸腰椎骨折患者120例纳入研究对象,根据术后护理方法不同分为给予常规护理的对照组和给予常规护理联合综合干预措施的观察组,比较两组患者的术后腹胀情况、胃泌素和胃动素含量、负面情绪情况。结果观察组肠鸣音(5.1±0.32)次/min、胃动素和胃泌素含量(209.5±33.8、63.8±8.2)pg/ml均明显高于对照组(P<0.05、0.01);腹胀发生率(6.7%)、腹胀持续时间(2.3±0.5)d、排便时间(20.5±6.4)h、HAMA评分、HAMD评分、SAS评分、SDS评分(18.4±2.5、17.9±2.1、44.7±6.2、42.5±5.8)均明显低于对照组( P<0.05)。结论术后综合干预措施有助于改善腹胀情况、缓解负面情绪、增加胃动素和胃泌素含量,是胸腰椎骨折术后的理想护理方式。%Objective To study the effect of nursing intervention on abdominal distension of patients with thoracolumbar frac-tures.Methods From July 2011 to October 2013 in our hospital patients with thoracolumbar fractures totaled of 120 were selected and divid-ed into control group and observation group.The control group adopted the routine nursing and the observation group adopted the comprehen-sive nursing based on the control group.Abdominal distension condition, negative emotion, motilin and gastrin content of two groups were compared.Results Bowel sounds (5.1 ±0.32) times/min, motilin, gastrin (209.5 ±33.8, 33.8 ±8.2 pg/ml in the observation group were significantly higher than those in the control group (P<0.05, 0.01);incidence of abdominal distension (6.7%), abdominal disten-sion duration (2.3 ±0.5) d, defecation time (20.5 +6.4) h, HAMA scores, HAMD scores, SAS scores and SDS score (18.4 ±2.5, 17.9 ±2.1, 44.7 ±6.2, 42.5 ±5.8) were significantly lower than those of control

  13. Thoracolumbar Fractures with Spinal Cord Injury Surgical Options and Efficacy Analysis%胸腰段骨折伴脊髓损伤的术式选择以及疗效分析

    Institute of Scientific and Technical Information of China (English)

    张雷炎

    2011-01-01

    Objective:To investigate the thoracolumbar fracture with spinal cord injury.Mehtods:thoracolumbar fractures with spinal cord injury in 39 patients,all with anterior,poaterior,and combined surgical approach before and after the method of surgical treatment.Single segment of which involved 35 cases,T11 5cases,T12 15 cases,L1 15 cases.4 cases involved double fault,T11 and T12 3 cases,T12 L1 1case.Results:All of the spinal cord have received a full and effective decompression,sinal fixation has beeb good ,with an average follow-up of 24 months,the bone graft at the fusion well,and 1 patient had a kyphosis,with 2cases pedicle screw loose,injured vertebra from preoperative (1.6±0.3)cm to apostoperative recovery (3.0±0.3)cm,cobb angle from preoperative(27±2)°restored to (40±3)°.Conclusion :In thoracolumabar fracture with surgical treatment of spinal cord injury,anterior and posterior were effective treatment methods,and advantages and disadvantages.%目的:探讨胸腰段骨折伴脊髓损伤的治疗.方法:胸腰段骨折伴脊髓损伤患者39例,全部均采用前路、后路及前后联合手术入路的方法行手术治疗.其中单节段受累35例,T11 5例、T12 15例、L1 15例.双节断受累4例、T11和T12 3例、T12 L1 1例.结果:所有的脊髓均获得了充分的有效的减压,脊柱得到了良好的内固定,平均随访了24个月,植骨处融合良好,有1例出现了脊拄后凸畸形,有2例出现椎弓根螺钉松动,伤椎由术前的(1.6±0.3)cm恢复到术后的(3.0±0.3)cm,cobb角由术前的(27±2)°恢复到(40±3)°结论:胸腰段骨折伴脊髓损伤的手术治疗中,前后路均为有效的方法,且各有优缺点.

  14. The treatment of stable inflectional vertebral compress fracture of thoracolumbar spine with sandbag pillow and exercise%沙袋垫枕锻炼法治疗胸腰段稳定型屈曲压缩性骨折

    Institute of Scientific and Technical Information of China (English)

    刘宏建; 杜靖远

    2004-01-01

    AIM: To treat the stable inflectional vertebral compress fracture of thoracolumbar with sandbag pillow and back extensor exercise .METHODS: After traumatism , the sandbag pillow of four specification from low to high were underlay to the thoracolumbar respectively every other 3 to 5 days, kept excessive extend posture for 8 to 10 weeks. When the sandbag pillow was underlain for 3 hours, trundle the body for sleeping in left or right posture for half an hour. Exercise started after the sandbag pillow were underlay for 1 or 2 days. Supine exercise techniques included 5points shoring and 3 points shoring. The former was 3 times per day, 30minutes to 1 hour once, more than 100 times per day and increased to 2minutes and 5 to 10 times per day gradually. Three weeks later, the latter group started after vertebral compress fracture 4 weeks, pronate exercise started.RESULTS: According to Dennis assess: of the 74 follow-up patients, 4remained low-grade pain on back and waist, 1 remained mid-grade pain, 1remained continued pain and gone with the complications of low limbs anaesthesia and urine incontinence. The rest were cured. Cobb angles decreased 5°- 35° (mean 17°) compared to original by X-ray examination in reexamination.CONCLUSION: This conventional therapy is easy to learn and popularize to treat compression fracture, and attained therapeutic success.%目的:沙袋垫枕加背伸肌锻炼法治疗胸腰段稳定型屈曲压缩性骨折.方法:胸腰段稳定型屈曲压缩性骨折100例,外伤后二三天开始,每隔3~5 d,分别应用由低到高4种规格的沙袋垫于胸腰段,维持过伸位至8~10周,每垫枕3 h,用整体滚动法可左右侧卧半小时.锻炼应从垫枕后一两天开始,仰卧锻炼法分为5点支撑法和3点支撑法,前者原则为3次/d,30min~1 h/次,不少于100次/d,渐过渡到逐日增加2min,次数5~10次/d;后者在前者应用3周后开始.俯卧位锻炼法要求在骨折后4周开始.结果:以Dennis评定方法:74

  15. Plans for Jet Energy Corrections at CMS

    Science.gov (United States)

    Mishra, Kalanand

    2009-05-01

    We present a plan for Jet Energy Corrections at CMS. Jet corrections at CMS will come initially from simulation tuned on test beam data, directly from collision data when available, and ultimately from a simulation tuned on collision data. The corrections will be factorized into a fixed sequence of sub-corrections associated with different detector and physics effects. The following three factors are minimum requirements for most analysis: offset corrections for pile-up and noise; correction for the response of the calorimeter as a function of jet pseudorapidity relative to the barrel; correction for the absolute response as a function of transverse momentum in the barrel. The required correction gives a jet Lorentz vector equivalent to the sum of particles in the jet cone emanating from a QCD hard collision. We discuss the status of these corrections, the planned data-driven techniques for their derivation, and their anticipated evolution with the stages of the CMS experiment.

  16. Atmospheric correction of APEX hyperspectral data

    Directory of Open Access Journals (Sweden)

    Sterckx Sindy

    2016-03-01

    Full Text Available Atmospheric correction plays a crucial role among the processing steps applied to remotely sensed hyperspectral data. Atmospheric correction comprises a group of procedures needed to remove atmospheric effects from observed spectra, i.e. the transformation from at-sensor radiances to at-surface radiances or reflectances. In this paper we present the different steps in the atmospheric correction process for APEX hyperspectral data as applied by the Central Data Processing Center (CDPC at the Flemish Institute for Technological Research (VITO, Mol, Belgium. The MODerate resolution atmospheric TRANsmission program (MODTRAN is used to determine the source of radiation and for applying the actual atmospheric correction. As part of the overall correction process, supporting algorithms are provided in order to derive MODTRAN configuration parameters and to account for specific effects, e.g. correction for adjacency effects, haze and shadow correction, and topographic BRDF correction. The methods and theory underlying these corrections and an example of an application are presented.

  17. 胸、腰椎椎体结核病椎置钉短节段内固定的疗效分析%Efficacy analysis of short segmental screw fixation on the decayed vertebral of thoracolumbar tuberculosis

    Institute of Scientific and Technical Information of China (English)

    王兵站; 谭洪宇; 廖文波; 刘培太; 刘屹林; 王利民

    2015-01-01

    Objective To explore the effectiveness of short segmental screw fixation and bone graft fusion on the decayed vertebral of thoracolumbar tuberculosis.Methods A total of 46 cases undergone one stage anterior debridement,interbody fusion,screw fixation on the decayed vertebral of thoracolumbar tuberculosis were retrospectively analyzed from June 2009 to November 2013.Including 25 males and 21 females,with the mean age of 39.6 years (range,13-69 years).Lesion segments:T6-L4 (segment lesions ≤ 3 segments); 3 B gradecases,6 C grade cases,4 D grade cases and 33 E grade cases assessmed by Frankel grade.The average Cobb angle of kyphosis was 16.34°±3.19° and ESR:19-81 mm/1 h preopration.CT scan and Two-dimensional reconstruction were done before operation,and the effective height of front and middle pillar of residual thoracolumbar vertebral in coronal and sagittal position were measured before operation,when the minimum effective height was higher than 10 mm,combined the intraoperative visual,the appropriate internal fixation for anterior debridement and interbody bone grafting were choosed.The cobb angle,the Frankel grade,the ESR and VAS value were compared with preoperative and postoperative.The stability and bone graft fusion were also observed.Results Fourty-six cases of patients were received followed up from 12 to 48 months,an average of 26 months.All patients with tuberculosis poisoning symptoms disappeared.The ESR:0-15 mm/1 h.Frankel rating at the end of postoperative follow-up:2 D-class cases,44 E-class cases.The VAS score (6.85± 1.22,4.49±0.95 vs.2.06±0.93) and vertebral Cobb angle (16.34°±3.19°,4.16°±2.71° vs.4.52°±1.29°) at post-operation 7 d and the last follow-up were significant lower than those at pre-operation,while the ESR (41.25±1.61 mm/1 h,17.36±6.82 mm/1 h vs.10.67±0.72 mm/1 h) was reduced to normal levelthan that of pre-operation.The comparative difference was statistically significant between pre-operative and post

  18. Clinical study of minimally invasive pedicle screw technique combined with percutaneous vertebral body ;in treatment of thoracolumbar burst fracture without neurological symptoms in elderly patients%微创椎弓根螺钉技术联合经皮椎体后凸成形术治疗老年无神经症状胸腰椎爆裂性骨折的临床研究

    Institute of Scientific and Technical Information of China (English)

    张育斌; 杨艳琴; 陈晓生; 杨周生

    2016-01-01

    Objective To compare the clinical efficacy of minimally invasive pedicle screw placement combined with Percutaneous kyphoplasty ( PKP) and PKP in the treatment of elderly patients with no neurological symptoms of thoracolumbar burst fracture .Methods 78 patients with thoracolumbar burst fracture were randomly divided into joint group (group A, n=39) and traditional group (group B, n=39).The clinical and imaging results were evaluated by 2 years follow-up.The clinical results mainly included pain visual analogue scale ( VAS ) , Oswestry Disability Index ( ODI ) .The imaging results included Cobb angle , Secondary fractures , adjacent segment fractures and bone cement leakage .Results There was no statistical difference between the two groups in operation time and duration of hospitalization (P>0.05).Compared pkp group, the combined group has higher bone cement injection ( P<0.05); PKP group had advantages in operation time and intraoperative blood loss (P<0.05).The combined group was superior to the PKP group in the correction of Cobb angle and excellent maintance after operation (P<0.05).Every time after surgery, the combined group were improved significantly compared PKP group in low back pain VAS score and ODI in postoperative follow-up time ( P <0.05).5 patients occurred secondary fractures and 9 patients were found adjacent vertebral fracture after operation in PKP, otherwise, combined group had no fracture .Conclusions Minimally invasive pedicle technique combined with PKP is more effective in correction of kyphotic deformity than pkp .It can quickly relieve postoperative low back pain and improve the quality of life .%目的:对比研究微创椎弓根螺钉置入联合经皮后凸成形术( Percutaneous kyphoplasty ,PKP)与单纯经PKP治疗老年性无神经症状胸腰椎爆裂性骨折,探讨其临床疗效。方法78例老年性胸腰椎爆裂性骨折患者,随机分为联合入路组(A组,n=39)和传统组(B组,n=39

  19. Sclerosing thoracolumbar discectomy via Wiltse approach%Wilts e入路治疗硬化性胸腰段椎间盘突出症的临床研究

    Institute of Scientific and Technical Information of China (English)

    徐兆万; 吴沁民; 戴伟华; 隋国侠; 冀旭斌; 庄青山

    2015-01-01

    Objective To evaluate the clinical effect of sclerosing thoracolumbar discectomy via Wiltse approach in the treatment of sclerosing thoracolumbar disc herniation. Methods Twenty-three cases were included in this group from July 2010 to June 2014. There were 17 males and 6 females. The age ranged from 19 to 71 years old, with an average of 42.9±23.36 years. The section of disc herniation located in T10/11 for 2 cases, T11/12 for 8, T12/L1 for 10, L1/2 for 3. All cases were single segment sclerosing disc herniation. No one was associated with ossification or hypertrophy of yellow ligament. All the sclerosing herniated discs were excised via the Wiltse approach. Results All patients had successful operations, one case (T10/11) appeared exacerbation of preexisting deficits after operation. The patient was treated with methylprednisolone, dehydrant and neural nutrition. After treatment, the patient had recovered to preoperative level. X-ray showed no malposition of internal fixation, CT scan showed complete removal of compressor. All 23 patients were followed up for an average of 19.8±15.72 months(range 3 to 36 months). All patients had neurofunction recovered to some extent. According to improved Macnab criteria, there were excellent in 13 cases, good in 7 cases, improved in 2 cases and poor in 1 case. The excellent and good rate was 86.96%and total effective rate was 95.65%. All got bony fusion without instrument failure. Conclusion Sclerosing thoracolumbar discectomy via Wiltse approach can improve the clinical result obviously.%目的:探讨经Wiltse入路治疗硬化性胸腰段椎间盘突出症的手术方法及临床疗效。方法2010年7月至2014年6月,治疗23例硬化性胸腰段椎间盘突出症患者,男17例,女6例;年龄19~71岁,平均(42.9±23.36)岁。椎间盘突出的节段:T 10/112例,T 11/128例,T 12/L110例,L1/23例。所有病例均为单节段硬化性椎间盘突出,不合并黄韧带骨化或肥厚。手术

  20. 后路椎体次全切除治疗胸腰椎爆裂性骨折%Clinical effect of posterior approach for spine reconstruction with subtotal vertebrectomy for thoracolumbar vertebra burst fractures with spinal cord injuries

    Institute of Scientific and Technical Information of China (English)

    何明长; 林斌; 许洋; 郭志民; 施建东

    2015-01-01

    目的:探讨经后路椎体次全切除治疗胸腰段爆裂骨折伴脊髓损伤的适应证及临床疗效。方法采用后路椎体次全切除椎管减压治疗41例伴脊髓、神经损伤的胸腰段爆裂骨折患者。比较术前及末次随访神经功能 ASIA 分级、伤椎前缘高度、后凸 Cobb 角,观察椎管容积率。结果手术时间180~290 min,术中出血量600~2 400 ml。所有患者伤口均一期愈合,无肺部感染。41例均获得随访,时间12~24个月。植骨均顺利融合,内固定无松动、断裂;椎体高度、曲度和椎管容积无明显丢失。术后6个月 ASIA 分级: A 级5例无恢复;B 级9例恢复至 C 级2例、 D 级5例、 E 级1例,1例无恢复;C 级13例恢复至 D 级5例、 E 级6例,2例无恢复;D 级14例恢复至 E 级13例,1例无恢复。 Cobb 角:术前23.6°±2.7°,术后6个月为6.4°±0.8°,P <0.01。椎管容积率:术前49.03%±6.04%,术后6个月为98.09%±0.98%,P <0.01。结论后路椎体次全切除、减压内固定治疗合并有肺挫伤、关节交锁、后方韧带复合体结构断裂等的胸腰椎爆裂性骨折并脊髓损伤,可有效恢复椎体高度、椎管容积及 Cobb 角度,减压彻底,是一种安全、有效的手术方法。%Objective To investigate the indications and clinical effect of posterior approach for spine reconstruction with subtotal vertebrectomy, decompression and internal fixation for thoracolumbar vertebra burst fractures with spinal cord injuries. Methods 41 patients with thoracolumbar veterbra burst fractures were treated with posterior approach for spine reconstruction with subtotal vertebrectomy, decompression and internal fixation were analyzed retrospective-ly. Results The operative time was 180 ~ 290 min, the hemorrhage was 600 ~ 2 400 ml,and the follow-up time was 12 ~ 24 months. All incisions were primary healing, and no lung infection was occurred. All the follow-up patients were obtained excellent

  1. Clinical analysis of early deep wound infection after posterior thoracolumbar spinal fixation%胸腰椎后路内固定术后伤口早期深部感染的临床分析

    Institute of Scientific and Technical Information of China (English)

    王林峰; 张静涛; 雷涛; 申勇

    2016-01-01

    背景:胸腰椎内固定术后手术部位感染是一种严重的并发症,对手术疗效起至关重要的作用。目的:探讨胸腰椎后路内固定术后伤口早期深部感染的临床特点。方法:回顾性分析2006年1月至2011年1月我院脊柱外科1100例胸腰椎后路内固定手术患者的临床资料。术后伤口早期感染患者65例,其中浅表感染40例,深部感染25例。深部感染患者中进行一次清创患者14例,多次清创患者11例;移除内固定患者9例,保留内固定患者16例。记录所有患者年龄、性别、BMI、病原菌种类、糖尿病、营养状况、激素使用、融合节段数、手术时间、出血量、异体输血及远处感染等情况。结果:与浅表感染患者相比,深部感染患者合并糖尿病及发生多重细菌感染的比率较高。多次清创患者中,耐甲氧西林金黄色葡萄球菌感染及远处感染的发生率高于一次清创者。内固定移除患者中,营养不足的比率高于内固定保留者。结论:深部感染患者常合并糖尿病及发生多重细菌感染,耐甲氧西林金黄色葡萄球菌感染及远处感染常需多次清创,营养不足可能是内固定保留失败的危险因素。%Background:Surgical site infection after thoracolumbar fixation is a serious complication, which can significant-ly affect clinical outcomes. Objective:To investigate the characteristics of early deep wound infection after posterior thora-columbar spinal fixation. Methods: Clinical data of 1100 patients who underwent posterior thoracolumbar fixation from Januray 2006 to January 2011 was analyzed retrospectively. Postoperative early wound infection developed in 65 patients of them. There were 40 cases with superficial infection and 25 with deep infection. Of the 25 cases with deep infection, 14 cas-es underwent debridement one time and 11 cases underwent multiple debridements;implants were preserved in 16 cases and removed

  2. 经皮椎弓根内固定治疗胸腰椎骨折的效果及并发症分析%Therapeutic effects and complications of percutaneous pedicle screw fixation for thoracolumbar fractures

    Institute of Scientific and Technical Information of China (English)

    罗鹏; 徐良丰; 倪文飞; 王向阳; 林焱; 毛方敏; 黄其杉; 徐华梓; 池永龙

    2011-01-01

    Objective To investigate the therapeutic effects and complications of percutaneous pedicle screw fixation for thoracolumbar fractures. Methods From January 2002 to December 2008,103 patients with thoracolumbar fractures were treated with percutaneous pedicle screw fixation, including 75 males and 28 females, the average age was 45.6 years ( range, 18-72 years). All of them were of no neurological deficits. There were 65 cases of traffic injury, 23 cases of fall injury and 15 cases of smashed injury. According to the Denis classification, 64 patients were of compression fractures, and 39 patients of burst fractures. There were 5 cases had fractures in T11, 30 in T12, 42 in L1, 15 in L2, 4 in L3, 3 in L4 ,2 in T11-12, 1 in L1-2, and 1 in L2-3. Radiological examinations, including X-ray and CT examinations, and clinical examinations were carried out to evaluate the therapeutic effects. Results Twenty one patients were lost to follow up, the remaining were followed up from 10 to 48 months with an average of 27.4 months.Before the operation, the vertebral height, the kyphposis angle and the occupation of spinal canal were (54. 5 ±8. 7)%, 16. 4°±2. 9°and 1.2 ± 1. 0, and were improved to (88.6 ±6. 4)%, 11.6°± 2. 7°and 0. 5 ± 0. 6 respectively after the operation. Preoperatively the visual analogue scale and the Oswestry disability index were 8. 0 ± 1.2 and 41.2 ± 9. 3, and were improved to 1.7 ± 1.8 and 6. 7 ± 5.6 postoperatively,respectively. All of these values between pre- and post-operatively were significantly different (P <0. 01 ). Screw misplacement was found in 7 patients, superficial wound infection in 1, screw breakage in 3, screw dislodgment in 2, cement leakage in 5, transient neurological symptoms in 4, and 8 patients with low back pain remained,of which 2 patients required occasional oral analgesics. Bone fusion achieved in all cases. Conclusions The clinical efficacy of percutaneous pedicle screw fixation is similar with conventional open

  3. Application of PMMA Combined with Pedicle Screw in Senile Thoracolumbar Vertebra Fracture%PMMA联合椎弓根螺钉在老年性胸腰椎骨折手术中的应用

    Institute of Scientific and Technical Information of China (English)

    陈大勇; 黄庆华; 李照明; 胡凯; 吴罗根; 周文华; 潘丹; 刘超; 李丰

    2013-01-01

    [目的]探讨用聚甲基丙烯酸甲酯(polymethylmethacrylate,PMMA)骨水泥联合椎弓根螺钉在治疗老年性胸腰椎骨折的早期临床疗效.[方法]回顾性分析2007年6月~2010年6月收治的41例老年性胸腰椎骨折患者采用PMMA联合椎弓根螺钉强化伤椎及椎板减压后外侧植骨融合治疗的临床资料.术前及术后6、12个月随访进行JOA评分,计算手术改善率;行X射线摄片并观察有无并发症发生.[结果]所有患者随访12~21个月,平均13个月.术前JOA评分平均(11±2.36)分,术后半年随访平均为(23±2.06)分,改善率75.0%;末次随访平均(25±2.29分),改善率87.5%,术前、术后JOA评分差异有显著性(P<0.01).置入螺钉过程中未发生因骨水泥渗漏、放热效应及毒性反应引起并发症.1例术后2月发生固定节段下方椎体的螺钉对椎体产生切割现象,但未出现神经根症状.其余患者未出现螺钉松动、断裂和脱落.[结论]PMMA联合椎弓根螺钉内固定能明显增强螺钉的稳定性,是一种治疗老年性胸腰椎骨折安全、可靠的方法.%[Objective]To explore the early clinical efficacy of polymethylmethacrylate(PMMA) bone cement combined with pedicle screw for the treatment of senile thoracolumbar vertebra fracture. [Methods]Clinical data of 41 elderly patients with thoracolumbar vertebra fractures treated with PMMA combined with pedicle screw for strengthening the injury vertebra and lateral grafted bone fusion after laminectomy from June 2007 to June 2010 were analyzed retrospectively. Preoperative and postoperative of JOA score was carried out during 6 and 12 months of follow up. The improvement ratio of the operation was calculated. X-ray radiography was performed. The incidence of the complications was observed. [Results]All patients were followed up for 12 to 21 months(mean 13 months). The mean preoperative JOA score was 11 ± 2. 36. The mean JOA score half a year after the operation was 23 ± 2. 06

  4. 3D计算机导航下经椎弓根骨水泥增强螺钉的应用%Polymethylmethacrylate-augmented thoracolumbar pedicle screw fixation guided by the three-dimensional navigation in osteoporotic patients

    Institute of Scientific and Technical Information of China (English)

    袁强; 张贵林; 吴静晔; 行勇刚; 何达; 孙宇庆; 田伟

    2014-01-01

    Objective To evaluate the safety and efficacy of polymethylmethacrylate (PMMA) -augmented thoracolumbar pedicle screw fixation guided by three-dimensional (3D) navigation in the osteoporotic patients.Methods From January 2010 to January 2012,27 osteoporotic patients with a variety of spinal disorders underwent PMMA-augmented thoracolumbar pedicle screw fixation guided by 3D navigation.They were 3 men and 24 women,aged from 51 to 92 years (average,70.1 years).Their osteoporosis was all serious.PMMA leakage was evaluated intraoperatively and postoperatively.Screw loosening and bone fusion were evaluated radiographically after operation.The Japanese Orthopaedic Association (JOA) scores of the patients were compared between preoperation and one year postoperation.Results Altogether 149 pedicle screws were implanted in the 27 patients.One patient died of postoperative pneumonia and the rest 26 patients were followed up for more than 12 months.No pedicle cortex breach or cement leakage surrounding the pedicle cortex was observed.None of the patients complained of dyspnoea showing evidence of pulmonary embolism or iatrogenic neural injury.No obvious deterioration of related symptoms or functions was observed after operation.The pre-operative JOA score (18.2 ± 2.6 points) was significantly increased (25.1 ± 2.3 points) postoperation (t =16.996,P =0.000),with a mean therapeutic improvement rate of 39.6%.None of the patients showed loosening or displacement of the implants.Lateral X-ray films showed bone fusion in 20 patients (76.9%) at the 12-month follow-up Conclusion PMMA-augmented thoracolumbar pedicle screw fixation guided by 3D navigation is safe and effective for osteoporotic patients with a variety of spinal disorders,leading to favorable outcomes both clinically and radiologically.%目的 评价在3D计算机导航下经椎弓根骨水泥增强胸腰椎椎弓根螺钉内固定术的安全性和有效性. 方法 2010年1月至2012年1月27例不同脊柱疾患

  5. CLINICAL MANIFESTATION AND STRATEGY FOR SURGICAL RESECTION AND RECONSTRUCTION OF THORACOLUMBAR VERTEBRAL OSTEOID OSTEOMA%胸腰椎椎体骨样骨瘤的临床表现和切除重建策略

    Institute of Scientific and Technical Information of China (English)

    施鑫; 任可; 吴苏稼; 周光新; 黎承军; 陆萌; 赵建宁

    2012-01-01

    Objective To investigate the clinical manifestation of thoracolumbar vertebral osteoid osteoma and to evaluate the surgical procedure and effectiveness of transpedicular tumor resection and spine reconstruction with posterior pedicle screw system and bone graft. Methods Between January 2001 and lune 2010, 8 cases of thoracolumbar vertebral osteoid osteoma underwent one-stage transpedicular intralesional excision and bone graft combined with spine reconstruction with pedicle screw system through posterior approach. There were 5 males and 3 females with a median age of 15.5 years (range, 6-27 years). Affected segments included T8 in 1 case, T10 in 1 case, L2 in 2 cases, L3 in 1 case, L, in 1 case, and L5 in 2 cases. All of the cases had back pain, 1 had radiating pain of lower extremity, and 4 patients presented with scoliosis. The mean diameter of lesions was 1.6 cm (range, 0.9-2.0 cm). Results The mean operation time was 110 minutes (range, 70-170 minutes) and the mean blood loss was 720 mL (range, 300-1 400 mL). The postoperative pathologic examination showed osteoid osteoma in all cases. All patients achieved healing of the incisions by first intention. Immediate relief of pain was observed after operation in all patients without complication. The patients were followed up 12-58 months (mean, 39 months). No local recurrence or spinal deformity was observed during the follow-up. Conclusion CT can show a low attenuation nidus with central mineral ization and varying degrees of perinidal sclerosis, so it has great value for final diagnosis of thoracolumbar vertebral osteoid osteoma. One-stage transpedicular intralesional excision supplemented by impaction bone graft and combined posterior pedicle screw stabilization is a safe and effective treatment.%目的 探讨胸腰椎椎体骨样骨瘤患者的临床表现特点和后路经椎弓根肿瘤切除植骨内固定手术的疗效.方法 2001年1月-2010年6月,收治8例胸腰椎椎体骨样骨瘤患者.男5例,女3

  6. Holographic Thermalization with Weyl Corrections

    CERN Document Server

    Dey, Anshuman; Sarkar, Tapobrata

    2015-01-01

    We consider holographic thermalization in the presence of a Weyl correction in five dimensional AdS space. We numerically analyze the time dependence of the two point correlation functions and the expectation values of rectangular Wilson loops in the boundary field theory. The subtle interplay between the Weyl coupling constant and the chemical potential is studied in detail. An outcome of our analysis is the appearance of a swallow tail behaviour in the thermalization curve, and we give evidence that this might indicate distinct physical situations relating to different length scales in the problem.

  7. Correct Linearization of Einstein's Equations

    Directory of Open Access Journals (Sweden)

    Rabounski D.

    2006-06-01

    Full Text Available Regularly Einstein's equations can be reduced to a wave form (linearly dependent from the second derivatives of the space metric in the absence of gravitation, the space rotation and Christoffel's symbols. As shown here, the origin of the problem is that one uses the general covariant theory of measurement. Here the wave form of Einstein's equations is obtained in the terms of Zelmanov's chronometric invariants (physically observable projections on the observer's time line and spatial section. The obtained equations depend on solely the second derivatives even if gravitation, the space rotation and Christoffel's symbols. The correct linearization proves: the Einstein equations are completely compatible with weak waves of the metric.

  8. Correction of gene expression data

    DEFF Research Database (Denmark)

    Darbani Shirvanehdeh, Behrooz; Stewart, C. Neal, Jr.; Noeparvar, Shahin;

    2014-01-01

    This report investigates for the first time the potential inter-treatment bias source of cell number for gene expression studies. Cell-number bias can affect gene expression analysis when comparing samples with unequal total cellular RNA content or with different RNA extraction efficiencies....... For maximal reliability of analysis, therefore, comparisons should be performed at the cellular level. This could be accomplished using an appropriate correction method that can detect and remove the inter-treatment bias for cell-number. Based on inter-treatment variations of reference genes, we introduce...

  9. Matrix Models and Gravitational Corrections

    CERN Document Server

    Dijkgraaf, R; Temurhan, M; Dijkgraaf, Robbert; Sinkovics, Annamaria; Temurhan, Mine

    2002-01-01

    We provide evidence of the relation between supersymmetric gauge theories and matrix models beyond the planar limit. We compute gravitational R^2 couplings in gauge theories perturbatively, by summing genus one matrix model diagrams. These diagrams give the leading 1/N^2 corrections in the large N limit of the matrix model and can be related to twist field correlators in a collective conformal field theory. In the case of softly broken SU(N) N=2 super Yang-Mills theories, we find that these exact solutions of the matrix models agree with results obtained by topological field theory methods.

  10. 78 FR 16753 - Service Delivery Plan; Correction

    Science.gov (United States)

    2013-03-18

    ... ADMINISTRATION Service Delivery Plan; Correction AGENCY: Social Security Administration. ACTION: Notice; request for comments; Correction. SUMMARY: The Social Security Administration published a document in the..., Office of Regulations, Social Security Administration. BILLING CODE 4191-02-P...

  11. 内镜下侧方入路单椎体内固定治疗胸腰椎压缩性骨折的解剖学研究%Anatomical study of only injured vertebrae internal fixation through lateral approach by endoscope to treat thoracolumbar vertebral compression fracture

    Institute of Scientific and Technical Information of China (English)

    李际才; 刘平均; 刘君华; 贺用礼; 毛炳焱; 王文聪; 晏平华; 丁原; 胡志喜

    2012-01-01

      目的探讨内镜下侧方入路单椎体内固定术治疗胸腰椎压缩性骨折在应用解剖上的可行性。方法随机选取12具脊柱胸腰段保存完整的成人尸体标本,垂直于矢状面将克氏针钻入T11-L4椎体侧方中央,观察脊神经的走行方向、冠状面上各克氏针与其后方经过的上位脊神经的距离、胸腰段椎体节段血管在椎体侧方的走行位置、椎体高度、椎体后缘与腔静脉、主动脉的距离,测量椎体侧方手术安全区。结果冠状面上T10-L3脊神经均走行于下位椎体侧方中线(克氏针)的后方,胸腰段椎体节段性血管紧贴椎体侧方自内上斜向外下走向,本手术路径无法避开,胸腰椎侧方存在手术安全区,左侧手术区较右侧更安全。结论内镜下侧方入路单椎体内固定治疗胸腰椎压缩性骨折在解剖学上是可行性的。%  Objective To investigate the feasibility of treatment thoracolumbar vertebral compression fracture by endoscopic lateral approach which only injured vertebrae internal fixated. Methods Select 12 thoracolumbar vertebrae with adult corpses specimens randomly, perpendicular to the vertical plane a gram needle drilling into the T11-L4 vertebral body side in central, observe the nerve way of T10-L3, coronary face every gram its rear after superior needle of the distance and chest pairs of vertebral segment lumbar blood vessels in the vertebral body side walk line position, thoracolumbar vertebral height, after vertebral bodies flanges and vena cava, aortic distance, calculation vertebral lateral surgical area safety. Results Coronary face T10-L3 nerve walking on lateral vertebral bodies under a line(gram needle) rear, segment artery of thoracolumbar vertebrae cling to the body, this surgery path can't avoid it, vertebral lateral side being security operation window, the left is right safety. Conclusion Minimal invasion through lateral approach by endoscopic treatment

  12. Automatic Power Factor Correction Using Capacitive Bank

    OpenAIRE

    Mr.Anant Kumar Tiwari,; Mrs. Durga Sharma

    2014-01-01

    The power factor correction of electrical loads is a problem common to all industrial companies. Earlier the power factor correction was done by adjusting the capacitive bank manually [1]. The automated power factor corrector (APFC) using capacitive load bank is helpful in providing the power factor correction. Proposed automated project involves measuring the power factor value from the load using microcontroller. The design of this auto-adjustable power factor correction is ...

  13. Network error correction with unequal link capacities

    OpenAIRE

    Kim, Sukwon; Ho, Tracey; Effros, Michelle; Avestimehr, Amir Salman

    2010-01-01

    We study network error correction with unequal link capacities. Previous results on network error correction assume unit link capacities. We consider network error correction codes that can correct arbitrary errors occurring on up to z links. We find the capacity of a network consisting of parallel links, and a generalized Singleton outer bound for any arbitrary network. We show by example that linear coding is insufficient for achieving capacity in general. In our exampl...

  14. 75 FR 2510 - Procurement List; Corrections

    Science.gov (United States)

    2010-01-15

    ... services on January 11, 2010 (75 FR 1354-1355). The correct date that comments should be received is... FR 1355-1356). The correct effective date should be February 11, 2010. ADDRESSES: Committee for... PEOPLE WHO ARE BLIND OR SEVERELY DISABLED Procurement List; Corrections AGENCY: Committee for...

  15. 45 CFR 1225.19 - Corrective action.

    Science.gov (United States)

    2010-10-01

    ... 45 Public Welfare 4 2010-10-01 2010-10-01 false Corrective action. 1225.19 Section 1225.19 Public... Corrective action. (a) When discrimination is found, Peace Corps or ACTION must take appropriate action to... corrective action to the agent and other class members in accordance with § 1225.10 of this part. (b)...

  16. 40 CFR 192.04 - Corrective action.

    Science.gov (United States)

    2010-07-01

    ... 40 Protection of Environment 24 2010-07-01 2010-07-01 false Corrective action. 192.04 Section 192... Corrective action. If the groundwater concentration limits established for disposal sites under provisions of § 192.02(c) are found or projected to be exceeded, a corrective action program shall be placed...

  17. 45 CFR 1225.10 - Corrective action.

    Science.gov (United States)

    2010-10-01

    ... 45 Public Welfare 4 2010-10-01 2010-10-01 false Corrective action. 1225.10 Section 1225.10 Public... Corrective action. When it has been determined by Final Agency Decision that the aggrieved party has been subjected to illegal discrimination, the following corrective actions may be taken: (a) Selection as...

  18. 10 CFR 72.172 - Corrective action.

    Science.gov (United States)

    2010-01-01

    ... 10 Energy 2 2010-01-01 2010-01-01 false Corrective action. 72.172 Section 72.172 Energy NUCLEAR... Corrective action. The licensee, applicant for a license, certificate holder, and applicant for a CoC shall... that the cause of the condition is determined and corrective action is taken to preclude...

  19. 42 CFR 431.246 - Corrective action.

    Science.gov (United States)

    2010-10-01

    ... 42 Public Health 4 2010-10-01 2010-10-01 false Corrective action. 431.246 Section 431.246 Public... Recipients Procedures § 431.246 Corrective action. The agency must promptly make corrective payments, retroactive to the date an incorrect action was taken, and, if appropriate, provide for admission...

  20. 40 CFR 35.3170 - Corrective action.

    Science.gov (United States)

    2010-07-01

    ... 40 Protection of Environment 1 2010-07-01 2010-07-01 false Corrective action. 35.3170 Section 35... STATE AND LOCAL ASSISTANCE State Water Pollution Control Revolving Funds § 35.3170 Corrective action. (a... will notify the State of such noncompliance and prescribe the necessary corrective action. Failure...