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Sample records for acromioclavicular joint reconstruction

  1. A modified surgical technique for reconstruction of an acute acromioclavicular joint dislocation

    Marchie Anthony

    2009-01-01

    Full Text Available We report a modified surgical technique for reconstruction of coracoclavicular and acromioclavicular ligaments after acute dislocation of acromioclavicular joint using suture anchors. We have repaired 3 consecutive type III acromioclavicular dislocations with good results. This technique is simple and safe and allows anatomical reconstruction of the ligaments in acute dislocations.

  2. Reconstruction of chronic acromioclavicular joint disruption with artificial ligament prosthesis

    Devendra Kumar Chouhan; Uttam Chand Saini; Mandeep Singh Dhillon

    2013-01-01

    Objective:Management of Rockwood type 3 acromioclavicular disruptions is a matter of debate.Should we adopt conservative or operative measures at first presentation? It is not clear but most of the evidences are in favour of conservative management.We present our experience in managing these patients surgically.Methods:We present a prospective series of eight cases of chronic Rockwood type 3 acromioclavicular joint disruptions treated surgically.Anatomical reconstruction of the coracoclavicular ligament was done by artificial braided polyester ligament prosthesis.Results:All the patients were able to perform daily activities from an average of the 14th postoperative day.All patients felt an improvement in pain,with decrease in average visual analogue scale from preoperative 6.5 points (range 3-9 points) to 2.0 points (range 0-5 points),Constant score from 59% to 91% and American Shoulder and Elbow Surgeons shoulder score from 65 to 93 points postoperatively.These results improved or at least remained stationary on midterm follow-up,and no deterioration was recorded at an average follow-up of 46 months.Conclusion:This midterm outcome analysis of the artificial ligament prosthesis is the first such follow-up study with prosthesis.Our results are encouraging and justify the further use and evaluation of this relatively new and easily reproducible technique.

  3. A new method of arthroscopic reconstruction of the dislocated acromio-clavicular joint.

    Trikha, S. P.; Acton, D.; Wilson, A. J.; Curtis, M. J.

    2004-01-01

    BACKGROUND: Symptomatic total acromio-clavicular joint dislocation (Rockwood et al. types III-VI) may be treated by surgical reconstruction. AIM: To describe an arthroscopically assisted technique to reconstruct anatomically the coraco-clavicular ligaments in acute or chronic (> 6 weeks) acromio-clavicular joint dislocation. METHODS: This new technique involves arthroscopic exposure of the coracoid process. Prior to introducing this technique, cadaveric studies were undertaken. RESULTS: Five ...

  4. Acromioclavicular joint reconstruction using the LockDown synthetic implant: a study with cadavers.

    Taranu, R; Rushton, P R P; Serrano-Pedraza, I; Holder, L; Wallace, W A; Candal-Couto, J J

    2015-12-01

    Dislocation of the acromioclavicular joint is a relatively common injury and a number of surgical interventions have been described for its treatment. Recently, a synthetic ligament device has become available and been successfully used, however, like other non-native solutions, a compromise must be reached when choosing non-anatomical locations for their placement. This cadaveric study aimed to assess the effect of different clavicular anchorage points for the Lockdown device on the reduction of acromioclavicular joint dislocations, and suggest an optimal location. We also assessed whether further stability is provided using a coracoacromial ligament transfer (a modified Neviaser technique). The acromioclavicular joint was exposed on seven fresh-frozen cadaveric shoulders. The joint was reconstructed using the Lockdown implant using four different clavicular anchorage points and reduction was measured. The coracoacromial ligament was then transferred to the lateral end of the clavicle, and the joint re-assessed. If the Lockdown ligament was secured at the level of the conoid tubercle, the acromioclavicular joint could be reduced anatomically in all cases. If placed medial or 2 cm lateral, the joint was irreducible. If the Lockdown was placed 1 cm lateral to the conoid tubercle, the joint could be reduced with difficulty in four cases. Correct placement of the Lockdown device is crucial to allow anatomical joint reduction. Even when the Lockdown was placed over the conoid tubercle, anterior clavicle displacement remained but this could be controlled using a coracoacromial ligament transfer. PMID:26637681

  5. Management of acromioclavicular joint injuries.

    Li, Xinning; Ma, Richard; Bedi, Asheesh; Dines, David M; Altchek, David W; Dines, Joshua S

    2014-01-01

    Acromioclavicular joint injuries are among the most common shoulder girdle injuries in athletes and most commonly result from a direct force to the acromion with the arm in an adducted position. Acromioclavicular joint injuries often present with associated injuries to the glenohumeral joint, including an increased incidence of superior labrum anterior posterior (SLAP) tears that may warrant further evaluation and treatment. Anteroposterior stability of the acromioclavicular joint is conferred by the capsule and acromioclavicular ligaments, of which the posterior and superior ligaments are the strongest. Superior-inferior stability is maintained by the coracoclavicular (conoid and trapezoid) ligaments. Type-I or type-II acromioclavicular joint injuries have been treated with sling immobilization, early shoulder motion, and physical therapy, with favorable outcomes. Return to activity can occur when normal shoulder motion and strength are obtained and the shoulder is asymptomatic as compared with the contralateral normal extremity. The management of type-III injuries remains controversial and is individualized. While a return to the previous level of functional activity with nonsurgical treatment has been documented in a number of case series, surgical reduction and coracoclavicular ligament reconstruction has been associated with a favorable outcome and can be considered in patients who place high functional demands on their shoulders or in athletes who participate in overhead sports. Surgical management is indicated for high-grade (≥type IV) acromioclavicular joint injuries to achieve anatomic reduction of the acromioclavicular joint, reconstruction of the coracoclavicular ligaments, and repair of the deltotrapezial fascia. Outcomes after surgical reconstruction of the coracoclavicular ligaments have been satisfactory with regard to achieving pain relief and return to functional activities, but further improvements in the biomechanical strength of these

  6. Complete acromioclavicular joint dislocation treated with reconstructed ligament by trapezius muscle fascia and observation of fascial metaplasia

    Wang Chaoliang

    2015-01-01

    Full Text Available We evaluated the long-term clinical results of acute complete acromioclavicular dislocations treated by reconstruction of the acromioclavicular and coracoclavicular ligament using trapezius muscle fascia. Open reduction and internal fixation was performed using the clavicular hook plate in 12 patients with acute complete acromioclavicular joint dislocation, and the acromioclavicular and coracoclavicular ligaments were reconstructed using trapezius muscle fascia. Radiographic evaluations were conducted postoperatively. We evaluated the functional results with constant scoring system and radiological results at the final follow-up visit. The mean Constant score at the final follow-up visit was 91.67 (range, 81 to 100. The results were excellent in eight patients (66.7% and good in four patients (33.3%. Three patients with scores from 80 to 90 had mild pain during activity, but this did not affect the range of motion of the shoulder. All patients have returned to their preoperative work without any limitations. Compared with the contralateral side, radiography showed anatomical reposition in the vertical plane in all cases. The hook-plate fixation with ligament reconstruction was successful in treating AC dislocations. The acromioclavicular and coracoclavicular ligament were reconstructed by trapezius muscle fascia that keep the distal clavicle stable both vertically and horizontally after type III injuries.

  7. Modified Weaver-Dunn Procedure Versus The Use of Semitendinosus Autogenous Tendon Graft for Acromioclavicular Joint Reconstruction

    Hegazy, Galal; Safwat, Hesham; Seddik, Mahmoud; Al-shal, Ehab A.; Al-Sebai, Ibrahim; Negm, Mohame

    2016-01-01

    Background: The optimal operative method for acromioclavicular joint reconstruction remains controversial. The modified Weaver-Dunn method is one of the most popular methods. Anatomic reconstruction of coracoclavicular ligaments with autogenous tendon grafts, widely used in treating chronic acromioclavicular joint instability, reportedly diminishes pain, eliminates sequelae, and improves function as well as strength. Objective: To compare clinical and radiologic outcomes between a modified Weaver-Dunn procedure and an anatomic coracoclavicular ligaments reconstruction technique using autogenous semitendinosus tendon graft. Methods: Twenty patients (mean age, 39 years) with painful, chronic Rockwood type III acromioclavicular joint dislocations were subjected to surgical reconstruction. In ten patients, a modified Weaver-Dunn procedure was performed, in the other ten patients; autogenous semitendinosus tendon graft was used. The mean time between injury and the index procedure was 18 month (range from 9 – 28). Clinical evaluation was performed using the Oxford Shoulder Score and Nottingham Clavicle Score after a mean follow-up time of 27.8 months. Preoperative and postoperative radiographs were compared. Results: In the Weaver-Dunn group the Oxford Shoulder Score improved from 25±4 to 40±2 points. While the Nottingham Clavicle Score increased from 48±7 to 84±11. In semitendinosus tendon graft group, the Oxford Shoulder Score improved from 25±3 points to 50±2 points and the Nottingham Clavicle Score from 48±8 points to 95±8, respectively. Conclusion: Acromioclavicular joint reconstruction using the semitendinosus tendon graft achieved better Oxford Shoulder Score and Nottingham Clavicle Score compared to the modified Weaver-Dunn procedure. PMID:27347245

  8. Acromioclavicular joint reconstruction with coracoacromial ligament transfer using the docking technique

    Gobezie Reuben

    2009-01-01

    Full Text Available Abstract Background Symptomatic Acromioclavicular (AC dislocations have historically been surgically treated with Coracoclavicular (CC ligament reconstruction with transfer of the Coracoacromial (CA ligament. Tensioning the CA ligament is the key to success. Methods Seventeen patients with chronic, symptomatic Type III AC joint or acute Type IV and V injuries were treated surgically. The distal clavicle was resected and stabilized with CC ligament reconstruction using the CA ligament. The CA ligament was passed into the medullary canal and tensioned, using a modified 'docking' technique. Average follow-up was 29 months (range 12–57. Results Postoperative ASES and pain significantly improved in all patients (p = 0.001. Radiographically, 16 (94% maintained reduction, and only 1 (6% had a recurrent dislocation when he returned to karate 3 months postoperatively. His ultimate clinical outcome was excellent. Conclusion The docking procedure allows for tensioning of the transferred CA ligament and healing of the ligament in an intramedullary bone tunnel. Excellent clinical results were achieved, decreasing the risk of recurrent distal clavicle instability.

  9. The acromioclavicular joint: Normal variation and the diagnosis of dislocation

    Acromioclavicular separation is a common traumatic injury. Diagnosis rests on clinical and radiographic findings. However, normal variation in the alignment of the acromioclavicular joint may make the roentgen diagnosis more difficult. We stress the variations of normal alignment at the acromioclavicular joint and offer suggestions for avoiding pitfalls in this clinical situation. (orig.)

  10. Acromioclavicular joint reconstruction using a tendon graft: a biomechanical study comparing a novel “sutured throughout” tendon graft to a standard tendon graft

    Naziri Qais

    2016-01-01

    Full Text Available Background: With a recurrence rate of over 30%, techniques that offer stronger acromioclavicular (AC joint reconstruction through increased graft strength may provide longevity. The purpose of our study was to determine the biomechanical strength of a novel tendon graft sutured throughout compared to a native tendon graft in Grade 3 anatomical AC joint reconstruction. Methods: For this in vitro experiment, nine paired (n = 18 embalmed cadaveric AC joints of three males and six females (age 86 years, range 51–94 years were harvested. Anatomic repair with fresh bovine Achilles tendon grafts without bone block was simulated. Specimens were divided into two groups; with group 1 using grafts with ultra-high molecular-weight polyethylene (UHMWPE suture ran throughout the entire length. In group 2, reconstruction with only native allografts was performed. The distal scapula and humerus were casted in epoxy compound and mounted on the mechanical testing machine. Tensile tests were performed using a mechanical testing machine at the rate of 50 mm/min. Maximum load and displacement to failure were collected. Results: The average load to failure was significantly higher for group 1 compared to group 2, with mean values of 437.5 N ± 160.7 N and 94.4 N ± 43.6 N, (p = 0.001. The average displacement to failure was not significantly different, with 29.7 mm ± 10.6 mm in group 1 and 25 mm ± 9.1 mm in group 2 (p = 0.25. Conclusion: We conclude that a UHMWPE suture reinforced graft can provide a 3.6 times stronger AC joint reconstruction compared to a native graft.

  11. Reconstruction of displaced acromio-clavicular joint dislocations using a triple suture-cerclage: description of a safe and efficient surgical technique

    Sandmann Gunther H

    2012-10-01

    Full Text Available Abstract Purpose In this retrospective study we investigated the clinical and radiological outcome after operative treatment of acute Rockwood III-V injuries of the AC-joint using two acromioclavicular (AC cerclages and one coracoclavicular (CC cerclage with resorbable sutures. Methods Between 2007 and 2009 a total of 39 patients fit the inclusion criteria after operative treatment of acute AC joint dislocation. All patients underwent open reduction and anatomic reconstruction of the AC and CC-ligaments using PDS® sutures (Polydioxane, Ethicon, Norderstedt, Germany. Thirty-three patients could be investigated at a mean follow up of 32±9 months (range 24–56 months. Results The mean Constant score was 94.3±7.1 (range 73–100 with an age and gender correlated score of 104.2%±6.9 (88-123%. The DASH score (mean 3.46±6.6 points, the ASES score (94.6±9.7points and the Visual Analogue Scale (mean 0.5±0,6 revealed a good to excellent clinical outcome. The difference in the coracoclavicular distance compared to the contralateral side was Conclusion Open AC joint reconstruction using AC and CC PDS cerclages provides good to excellent clinical results in the majority of cases. However, radiographically, the CC distance increased significantly at final follow up, but neither the amount of re-dislocation nor calcifications of the CC ligaments or osteoarthritis of the AC joint had significant influence on the outcome. Level of evidence Case series, Level IV

  12. Operative treatment of acromioclavicular joint dislocation: a new technique with suture anchors

    Zhang Jingwei

    2014-07-01

    Full Text Available 【Abstract】Objective: To evaluate clinical outcome of suture anchors in strengthening both acromioclavicular and coracoclavicular ligaments in the surgical treatment of acromioclavicular joint dislocation. Methods: Twenty-eight patients with acute traumatic Rockwood III, IV and V dislocations of the acromioclavicular joint surgically treated at our institute between October 2010 and January 2012 were recruited. All patients underwent open reduction combined with suture anchors. Function was evaluated using the ConstantMurley shoulder score. Clinical and radiographic shoulder ratings were evaluated using Taft criteria at 3, 6 and 12 months. Results:Two cases with fixation loosening were not included in final statistical analysis. Other patients obtained full joint reposition on immediate postoperative radiographs. Follow-up was performed with an average of 15.6 months (range, 12-19. After early range of motion exercises, 96.2% of the patients (25/26 could abduct and elevate their shoulders more than 90 degrees within postoperative 3 months. There was no infection. Average Constant-Murley score was 96.3 points (range, 94-100 and mean Taft shoulder rating was 10.7 points (range, 8-12 at 12 months. Conclusion: The suture anchor is a relatively simple technique and can avoid screw removal which is helpful in reconstructing both acromioclavicular and coracoclavicular ligaments in acute traumatic acromioclavicular joint dislocation. Key words: Acromioclavicular joint; Dislocations; Surgery; Suture anchors

  13. Arthroscopically Assisted Treatment of Acute Dislocations of the Acromioclavicular Joint

    Braun, Sepp; Beitzel, Knut; Buchmann, Stefan; Imhoff, Andreas B.

    2015-01-01

    Arthroscopically assisted treatments for dislocations of the acromioclavicular joint combine the advantages of exact and visually controlled coracoid tunnel placement with the possibility of simultaneous treatment of concomitant injuries. The clinical results of previous arthroscopically assisted techniques have been favorable at midterm and long-term follow-up. The presented surgical technique combines the advantages of arthroscopically positioned coracoclavicular stabilization with an additional suture cord cerclage of the acromioclavicular joint capsule for improved horizontal stability. PMID:26870646

  14. Operative treatment of acromioclavicular joint dislocation:a new technique with suture anchors

    Zhang Jingwei; Li Min; He Xianfeng; Yu Yihui; Zhu Limei

    2014-01-01

    Objective:To evaluate clinical outcome of suture anchors in strengthening both acromioclavicular and coracoclavicular ligaments in the surgical treatment of acromioclavicular joint dislocation.Methods:Twenty-eight patients with acute traumatic Rockwood Ⅲ,Ⅳ and Ⅴ dislocations of the acromioclavicular joint surgically treated at our institute between October 2010 and January 2012 were recruited.All patients underwent open reduction combined with suture anchors.Function was evaluated using the ConstantMurley shoulder score.Clinical and radiographic shoulder ratings were evaluated using Taft criteria at 3,6 and 12 months.Results:Two cases with fixation loosening were not included in final statistical analysis.Other patients obtained full joint reposition on immediate postoperative radiographs.Follow-up was performed with an average of 15.6 months (range,12-19).After early range of motion exercises,96.2% of the patients (25/26) could abduct and elevate their shoulders more than 90 degrees within postoperative 3 months.There was no infection.Average Constant-Murley score was 96.3 points (range,94-100)and mean Taft shoulder rating was 10.7 points (range,8-12) at 12 months.Conclusion:The suture anchor is a relatively simple technique and can avoid screw removal which is helpful in reconstructing both acromioclavicular and coracoclavicular ligaments in acute traumatic acromioclavicular joint dislocation.

  15. Epidemiology of Isolated Acromioclavicular Joint Dislocation

    Claudio Chillemi

    2013-01-01

    Full Text Available Background. Acromioclavicular (AC joint dislocation is a common shoulder problem. However, information about the basic epidemiological features of this condition is scarce. The aim of this study is to analyze the epidemiology of isolated AC dislocation in an urban population. Materials and Methods. A retrospective database search was performed to identify all patients with an AC dislocation over a 5-year period. Gender, age, affected side and traumatic mechanism were taken into account. X-rays were reviewed by two of the authors and dislocations were classified according to the Rockwood’s criteria. Results. A total of 108 patients, with a mean age of 37.5 years were diagnosed with AC dislocation. 105 (97.2% had an isolated AC dislocation, and 3 (2.8% were associated with a clavicle fracture. The estimated incidence was 1.8 per 10000 inhabitants per year and the male-female ratio was 8.5 : 1. 50.5% of all dislocations occurred in individuals between the ages of 20 and 39 years. The most common traumatic mechanism was sport injury and the most common type of dislocation was Rockwood type III. Conclusions. Age between 20 and 39 years and male sex represent significant demographic risk factors for AC dislocation.

  16. Three Endobutton plates in reconstruction of coracoclavicular ligament for the dislocations of the acromioclavicular joint%三Endobutton钢板解剖重建喙锁韧带治疗肩锁关节脱位

    吕书军; 曹勇; 洪晔; 蒋栋; 周广(钅监)

    2012-01-01

    目的 探讨三Endobutton钢板解剖重建喙锁韧带治疗肩锁关节脱位的初步临床疗效.方法 对25例肩锁关节脱位患者应用三Endobutton钢板解剖重建喙锁韧带治疗的临床疗效进行分析.结果 25例均获随访,时间14~29个月.X线检查证实肩锁关节脱位均完全复位.肩关节外展活动范围术前为40°~80°,术后为140°~150°.肩关节功能按Constant标准,评分术前为(66.5±3.2)分,术后3个月为(90.5±2.3)分,术后6个月为(93.5±3.1)分.结论 三Endobutton钢板解剖重建喙锁韧带治疗肩锁关节脱位固定确实,不损伤关节面,术后患者可以早期功能锻炼,无需二次手术,疗效满意.%Objective To evaluate the clinical results of three Endobutton plates in reconstruction of coracoclavicular ligament for the dislocations of the acromioclavicular joint. Methods 25 patients with the dislocations of the acromi-oclavicular joint were reviewed retrospectively. The Constant evaluation system were used to analyze the clinical effects of triple button plates technique. Results All patients obtained the follow-up and the time was 14 to 29 months. Preoperative shoulder abduction range was 40° to 80°. Postoperative abduction range was 140° to 150°. Pre-operative shoulder function according to the standard of Constant score was 66. 5 ± 3. 2 points. After 3 months, Constant score was ( 90. 5 ± 2. 3 ) points, and 6 months Constant score was ( 93. 5 ± 3. 1 ) points. Conclusions The treatment of dislocations of acromioclavicular joint by using reconstruction of coracoclavicular ligament has satisfactory functional outcome and a few trauma in joint surface, without the secondary operation.

  17. Arthroscopic coracoclavicular ligament reconstruction for Rockwood type Ⅲ acromioclavicular joint dislocations%肩关节镜下喙锁韧带重建术治疗 RockwoodⅢ型肩锁关节脱位的疗效研究

    李奉龙; 姜春岩

    2015-01-01

    目的:分析采用肩关节镜下喙锁韧带重建术治疗 Rockwood Ⅲ型肩锁关节脱位的临床疗效。方法回顾性研究2013年2月至2014年1月连续收治并获得随访的21例 Rockwood Ⅲ型肩锁关节脱位患者的资料。其中男性17例,女性4例。平均年龄42.8岁,平均受伤到手术时间11.1 d。所有患者均于肩关节镜下应用同种异体肌腱重建喙锁韧带并高强度缝线捆扎固定喙锁间隙治疗肩锁关节脱位。术后定期随访,记录患侧肩关节活动范围,并采用疼痛视觉模拟评分(visual analogue score,VAS)、ASES(American shoulder and elbow surgeons)评分及 UCLA(university of California Los Angeles)评分评价患者肩关节功能状况;同时拍摄肩关节正位、侧位及腋位 X 线片,评估是否有肩锁关节复位丢失。结果21例患者术后平均随访(14.6±3.9)个月。末次随访时肩关节平均前屈上举为173.9°±10.3°,体侧外旋为59.5°±14.3°,内旋为第12胸椎体水平,平均 UCLA 评分为(34.1±2.5)分,平均 ASES 评分为(95.5±4.7)分,平均 VAS 评分(0.3±0.6)分。末次随访拍摄肩关节 X 线片未发现肩锁关节复位丢失。结论采用肩关节镜下喙锁韧带重建术治疗 Rockwood Ⅲ型肩锁关节脱位的临床疗效满意,患者术后可获得良好的肩关节功能。%Background Dislocation of the acromioclavicular joint is a common injury of shoulder girdle.For the dislocation of acromioclavicular joint of Rockwood type Ⅰ and type Ⅱ,patient can obtain satisfactory result from conservative treatment; For the severe dislocation such as Rockwood type Ⅳ and type Ⅴ,operative treatment should be a good choice.However,for the patients of Rockwood type Ⅲ dislocation,the treatment is still controversial.With the development of minimally invasive technique,arthroscopic ligament reconstruction is gradually widely used in the treatment of acromioclavicular joint dislocation.Shoulder arthroscopic operation has the

  18. Endobutton technique for the treatment of acute acromioclavicular joint dislocations

    Raif Özden

    2014-06-01

    Full Text Available Objective: Acromioclavicular (AC joint dislocation is a common injury frequently affecting young athletes. The aim of this study is to evaluate postoperative functional results in cases diagnosed with acute AC joint dislocation stabilized with endobutton system. Methods: This fixation procedure has been applied on 10 patients. Indications of the technique included: a grade V AC joint dislocation (7 patients, and grade III AC joint dislocation (3 patient according to Rockwood classification. The coracoclavicular (CC interval and AC joint were reduced using two endobuttons. One endobutton was fitted on the clavicle and the second was placed at the undersurface of the coracoid. Outcomes were assessed with the Constant shoulder score and visual analog pain scale. Results: All the patients had powerful intraoperative fixation. Immediately after surgery, and 6 weeks, and 1 year postoperative radiographs showed adequate reduction of the CC distance and the AC joint. The mean Constant shoulder score was 89 (88–92 in the injured shoulder and 90 (88–93 in the uninjured shoulder. There was no statically significant difference between the injured and normal shoulder in terms of Constant shoulder score and there was no complication during the process. Conclusion: This technique is a safe and effective method for providing fixation for the AC joint.

  19. Relationship between MRI and clinical findings in the acromioclavicular joint

    Objective: To determine the relationship between the magnetic resonance (MR) appearance of the acromioclavicular (AC) joint and the physical findings. Design: A total of 116 consecutive patients underwent routine MR imaging (MRI) of the shoulder over an 18-month period. All MR studies were interpreted by a blinded, experienced musculoskeletal radiologist. Eleven variables were studied: the presence of osteophytes; fluid in the joint; fluid outside the joint; high signal in the clavicle or in the acromion; fluid in the subacromial bursa; irregularity of the joint margins; bulging of the capsule; widening of the joint; the age of the patient; and the presence of a rotator cuff tear. The clinical information was supplied by an experienced shoulder surgeon blinded to the MRI findings. A control group of 23 normal volunteers was also studied. Results: The only statistically significant correlation (P=0.0249) was between high signal in the distal clavicle and degenerative changes found clinically. A weaker relationship existed between fluid in the joint and the clinical examination and between increasing degenerative changes and advancing age. Otherwise, no material relationship was found between any of the other MR abnormalities and the clinical picture. Conclusion: There appears to be no real correlation between the MR appearances and the clinical findings in the AC joint. (orig.)

  20. Clinical Effect of Acute Complete Acromioclavicular Joint Dislocation Treated with Micro-Movable and Anatomical Acromioclavicular Plate

    Qingjun Liu, Jianyun Miao, Bin Lin, Zhimin Guo

    2012-01-01

    Full Text Available Objectives: We evaluated the long-term clinical results of acute complete acromioclavicular dislocations treated with micro-movable and anatomical acromioclavicular plate.Methods: Open reduction and internal fixation was performed using the MAAP in 16 patients (10 males, 6 females; mean age 36 years; range16 to 63 years with acute complete acromioclavicular joint dislocation. Radiographic evaluations were routinely conducted every 3 weeks until 3 months postoperatively. The MAAP were removed under local anesthesia after 3 months postoperatively. We evaluated the functional results by using the constant scoring system and radiological results in the last follow-up time. The mean follow up was 26 months (range 16 to 38 months.Results: The mean Constant score was 94 (range, 78 to 100. The results were excellent in 12 patients (75.0%, good in 3 patients (18.8% and satisfactory in 1patient (6.2%. Three patients with scores of 80 to 90 had mild pain during activity, but have not affected the shoulder range of motion. One patient has both some pain and limited range of motion of shoulder joint. All patients but one have returned to their preoperative work without any limitations. Compared to the contralateral side, radiography showed anatomical reposition in the vertical plane in 14 cases, slight loss of reduction in 2 older patients.Conclusion: We recommend the MAAP fixation for surgical treatment of acute complete acromioclavicular joint dislocation as it could provide satisfactory shoulder functions and clinical results, with lower complication rate. However, it is necessary to continue to observe the clinical effects of this fixation technique.

  1. Static and functional ultrasonographic picture shoulder and acromioclavicular joints in normal and at hypermobility

    Litvin Yu.P.

    2012-01-01

    Full Text Available Studying of anatomy humeral and acromioclavicular joints according to static and functional ultrasonography in norm and at hypermobility was an objective of this research. For the decision of an object in view we had been surveyed 45 persons at the age from 15 till 59 years (middle age has made 32,4±1,6 year, from them 32 men and 13 women. To clinical signs of hypermobility an investigated contingent have divided on two groups: the basic – 15 patients and control – 30 patients. It is established that humeral and acromioclavicular joints on ultrasonograms the features have display of elements. In research are described not changed soft tissue and bone structures, and also variants of their normal structure. By means of functional ultrasonography the basic signs of instability humeral and acromioclavicular joints have been defined.

  2. Acromioclavicular joint cyst: nine cases of a pseudotumor of the shoulder

    (1) To analyse the imaging appearances of nine patients with acromioclavicular joint cysts presenting as shoulder masses for tumor staging with operative, histopathological and joint aspiration findings. Retrospective review of imaging and correlation with clinical, operative and surgical notes. Images were reviewed by two musculoskeletal radiologists by consensus. Nine patients who presented clinically with a shoulder mass were evaluated by radiographs (n=9), ultrasound (n=1), conventional arthrography (n=3), MRI (n=6; with direct MR arthrography n=2, indirect MR arthrography n=4). All patients had a focal mass superior to the AC joint, with a size ranging from 1.5 cm to 6 cm and a mean of 3.27 cm. Correlation was available with surgery (n=7), histopathology (n=2) and cyst aspiration (n=2). Two patients were managed conservatively. Geyser sign was positive in all three arthrograms. All MRIs revealed extensive rotator cuff tears with a column of fluid extending from the glenohumeral joint through the rotator cuff tear into the acromioclavicular joint and acromioclavicular cyst. Chondrocalcinosis was seen in the acromioclavicular joint cyst (n=2) and in the glenohumeral joint (n=1). Aspirate in two patients contained calcium pyrophosphate dihydrate crystals. (orig.)

  3. Shoulder tendinitis and osteoarthrosis of the acromioclavicular joint and their relation to sports.

    Stenlund, B

    1993-01-01

    A sample of 207 men from the construction industry was studied using an epidemiological technique of cross-sectional design to investigate if sport activities involving the arms increase the risk of developing shoulder tendinitis or osteoarthrosis of the acromioclavicular joint. The relative risk for shoulder tendinitis was estimated to be 9.5 on the right side, and 4.9 on the left side for a lifetime of sport activity exceeding 8399 h. Subjects who reported both extremely high physical load ...

  4. Nonoperative management of a sagittal coracoid fracture with a concomitant acromioclavicular joint separation

    Thomas Kristen

    2010-01-01

    Full Text Available Separation of the acromioclavicular joint in conjunction with a coracoid fracture is a rare injury. Treatment decisions are traditionally based on the level of the fracture, the status of the coracoclavicular ligament and the activity level of the patient. We present a novel coracoid fracture pattern treated nonoperatively in a young, active patient and a thorough review of the literature regarding this topic.

  5. Coracoid Process Avulsion Fracture at the Coracoclavicular Ligament Attachment Site in an Osteoporotic Patient with Acromioclavicular Joint Dislocation.

    Onada, Yoshihiro; Umemoto, Takahisa; Fukuda, Kimitaka; Kajino, Tomomichi

    2016-01-01

    Coracoid fractures are uncommon, mostly occur at the base or neck of the coracoid process (CP), and typically present with ipsilateral acromioclavicular joint (ACJ) dislocation. However, CP avulsion fractures at the coracoclavicular ligament (CCL) attachment with ACJ dislocation have not been previously reported. A 59-year-old woman receiving glucocorticoid treatment fell from bed and complained of pain in her shoulder. Radiographs revealed an ACJ dislocation with a distal clavicle fracture. Three-dimensional computed tomography (3D-CT) reconstruction showed a small bone fragment at the medial apex of the CP. She was treated conservatively and achieved a satisfactory outcome. CP avulsion fractures at the CCL attachment can occur in osteoporotic patients with ACJ dislocations. Three-dimensional computed tomography is useful for identifying this fracture type. CP avulsion fractures should be suspected in patients with ACJ dislocations and risk factors for osteoporosis or osteopenia. PMID:27493819

  6. Coracoid Process Avulsion Fracture at the Coracoclavicular Ligament Attachment Site in an Osteoporotic Patient with Acromioclavicular Joint Dislocation

    Umemoto, Takahisa; Fukuda, Kimitaka; Kajino, Tomomichi

    2016-01-01

    Coracoid fractures are uncommon, mostly occur at the base or neck of the coracoid process (CP), and typically present with ipsilateral acromioclavicular joint (ACJ) dislocation. However, CP avulsion fractures at the coracoclavicular ligament (CCL) attachment with ACJ dislocation have not been previously reported. A 59-year-old woman receiving glucocorticoid treatment fell from bed and complained of pain in her shoulder. Radiographs revealed an ACJ dislocation with a distal clavicle fracture. Three-dimensional computed tomography (3D-CT) reconstruction showed a small bone fragment at the medial apex of the CP. She was treated conservatively and achieved a satisfactory outcome. CP avulsion fractures at the CCL attachment can occur in osteoporotic patients with ACJ dislocations. Three-dimensional computed tomography is useful for identifying this fracture type. CP avulsion fractures should be suspected in patients with ACJ dislocations and risk factors for osteoporosis or osteopenia. PMID:27493819

  7. Coracoid Process Avulsion Fracture at the Coracoclavicular Ligament Attachment Site in an Osteoporotic Patient with Acromioclavicular Joint Dislocation

    Yoshihiro Onada

    2016-01-01

    Full Text Available Coracoid fractures are uncommon, mostly occur at the base or neck of the coracoid process (CP, and typically present with ipsilateral acromioclavicular joint (ACJ dislocation. However, CP avulsion fractures at the coracoclavicular ligament (CCL attachment with ACJ dislocation have not been previously reported. A 59-year-old woman receiving glucocorticoid treatment fell from bed and complained of pain in her shoulder. Radiographs revealed an ACJ dislocation with a distal clavicle fracture. Three-dimensional computed tomography (3D-CT reconstruction showed a small bone fragment at the medial apex of the CP. She was treated conservatively and achieved a satisfactory outcome. CP avulsion fractures at the CCL attachment can occur in osteoporotic patients with ACJ dislocations. Three-dimensional computed tomography is useful for identifying this fracture type. CP avulsion fractures should be suspected in patients with ACJ dislocations and risk factors for osteoporosis or osteopenia.

  8. Acroplate--a modern solution for the treatment of acromioclavicular joint dislocation.

    Cîrstoiu, C; Rădulescu, R; Popescu, D; Ene, R; Circotă, G; Bădiceanu, Corina

    2009-01-01

    Two main ways to fix the reduction were imposed in surgical treatment of the acromioclavicular joint dislocations: fixation with trans acromioclavicular pin (Phemister method) and fixation with plate and screws type acroplate. The purpose of the present paper work is to compare immediate and later postoperative results between the two types of surgical interventions. During 2005-2007, 37 surgical reductions and fixation of acromioclavicular joint dislocations were performed in the Orthopedic-Traumatology Clinic of SUUB. In 17 cases a fixation with screws and plates type acroplate has been performed and in 20 cases with pins using the Phemister method. Sex ratio: 31 men and 8 women. Patients were aged between 17 and 56 years old. Follow up at 6 weeks, 3, 6, 12 and 18 post-operatory months. Osteosintesis material removing was done postoperatively, at 4 weeks in case of acroplate's and at 6 weeks in case of the pins. All patients treated of fixation with plate and screws acroplate type had a favorable evolution/development, starting with the shoulder joint mobilization at 24 hours postoperatively, with a complete recovery 4 weeks after the operation, at the same time with the ablation, and without immediate other late complications. As far as the patients treated by using the Phemister method are concerned, they were applied an immobilization, postoperatively. Desault bandage or the scarf for a period between 1 and 3 weeks, beginning with the shoulder joint mobilization later on and a full recovery after a minimum of 6 weeks. However, 3 of the cases showed a migration of one or both pins. Following the study, a more rapid recovery resulted, complete, and without complications of mobility in the shoulder joint, when using plate type acroplate vs pin. PMID:20108536

  9. Comparative study on treating complete dislocation of acromioclavicular joint with three different methods

    林斌; 练克俭; 郭林新; 郭志民; 庄泽民; 刘庆军; 周亮

    2004-01-01

    Objective: To comparatively study complete dislocation of acromioclavicular joint treated with three different methods.Methods:A total of 96 patients (81 males and 15 females, aged 16-59 years, mean =45 years) with complete dislocation of acromioclavicular joint were treated with Dewar's operation ( Group A, n = 32), internal fixation with Kirschner tension band wires ( Group B, n = 44), or internal fixation with Wolter plates ( Group C, n = 20 ),respectively, in this study. Eighty-five patients suffered from acute dislocations and eleven from chronic dislocations. Results: The patients were followed up for 50 months on an average. According to Karlsson's standard, in Group A, 26 patients were assessed as good, 5 as fair and 1 as poor. In Group B, 20 patients were assessed as good, 13 as fair and 11 as poor. In Group C, 15 patients were assessed as good, 4 as fair and 1 as poor. The good and fair rates were significantly different between Group A and Group B, and between Group C and Group B, but no statistical difference was found between Group A and Group C. The operating time was ( 52.36 ± 7.24 ) minutes, ( 67.43 ± 8.11) minutes and (69.73 ±8.04) minutes in Groups A, B and C, respectively. And the hospitalizing fees were (2 400 ±270) yuan, (2 100±190) yuan and (8450±360) yuan in Groups A, B and C, respectively. Conclusions: Dewar's operation is a good and safe method with shorter operating time and lower hospitalizing fee for treating complete dislocation of acromioclavicular joint. The method is simple without the need of a second operation to remove the implants and with few complications.

  10. Type IV acromioclavicular joint dislocation associated with a mid-shaft clavicle malunion.

    Mohammed, Khalid D; Stachiw, Danielle; Malone, Alex A

    2016-01-01

    This reports presents the case of a combined clavicle fracture malunion and chronic Type IV acromioclavicular (AC) joint dislocation. The patient was seen acutely in the emergency department following a mountain bike accident at which time the clavicle fracture was identified and managed conservatively however the AC dislocation was not diagnosed. The patient presented 25 months following the injury with persistent pain and disability and was treated with clavicle osteotomy and AC stabilization. We document the clinical details, surgical treatment and outcome. PMID:26980988

  11. Type IV acromioclavicular joint dislocation associated with a mid-shaft clavicle malunion

    Khalid D Mohammed

    2016-01-01

    Full Text Available This reports presents the case of a combined clavicle fracture malunion and chronic Type IV acromioclavicular (AC joint dislocation. The patient was seen acutely in the emergency department following a mountain bike accident at which time the clavicle fracture was identified and managed conservatively however the AC dislocation was not diagnosed. The patient presented 25 months following the injury with persistent pain and disability and was treated with clavicle osteotomy and AC stabilization. We document the clinical details, surgical treatment and outcome.

  12. Acute septic arthritis of the acromioclavicular joint caused by Haemophilus parainfluenzae: a rare causative origin.

    Hong, Myong-Joo; Kim, Yeon-Dong; Ham, Hyang-Do

    2015-04-01

    Septic arthritis of the acromioclavicular (AC) joint is a rare entity with symptoms that include erythema, swelling, and tenderness over the AC joint, fever, and limitation of shoulder motion with pain. In previous reports, Staphylococcus and Streptococcus species have been mentioned as common causative organisms. Haemophilus parainfluenzae is a normal inhabitant of the oral cavity, respiratory tract, gastrointestinal tract, and urogenital tract. However, it sometimes causes opportunistic infections leading to septic arthritis and osteomyelitis. AC joint infection associated with H.parainfluenzae is very rare, and only one case has been reported in the literature. Moreover, septic arthritis in immunocompetent patients is also very rare. Here, we report the case of a healthy patient with H. parainfluenzae-related septic arthritis of the AC joint. PMID:24584486

  13. Bioabsorbable Suture Anchor Migration to the Acromioclavicular Joint: How Far Can These Implants Go?

    Giovanna Medina

    2014-01-01

    Full Text Available Few complications regarding the use of bioabsorbable suture anchors in the shoulder have been reported. What motivated this case report was the unusual location of the anchor, found in the acromioclavicular joint which, to our knowledge, has never been reported so far. A 53-year old male with previous rotator cuff (RC repair using bioabsorbable suture anchors presented with pain and weakness after 2 years of surgery. A suspicion of retear of the RC led to request of a magnetic resonance image, in which the implant was found located in the acromioclavicular joint. The complications reported with the use of metallic implants around the shoulder led to the development of bioabsorbable anchors. Advantages are their absorption over time, minimizing the risk of migration or interference with revision surgery, less artifacts with magnetic resonance imaging, and tendon-to-bone repair strength similar to metallic anchors. Since the use of bioabsorbable suture anchors is increasing, it is important to know the possible complications associated with these devices.

  14. ISAKOS upper extremity committee consensus statement on the need for diversification of the Rockwood classification for acromioclavicular joint injuries

    Beitzel, Knut; Mazzocca, Augustus D; Bak, Klaus;

    2014-01-01

    Optimal treatment for the unstable acromioclavicular (AC) joint remains a highly debated topic in the field of orthopaedic medicine. In particular, no consensus exists regarding treatment of grade III injuries, which are classified according to the Rockwood classification by disruption of both th...

  15. 全关节镜下治疗肩锁关节脱位%Arthroscopic treatment of acromioclavicular joint dislocation

    汪国友; 沈骅睿; 曾胜强; 徐平; 邓凯; 扶世杰

    2014-01-01

    Background The dislocation of acromioclavicular joint is a common injury clinically. This study is to investigate the treatment of acute acromioclavicular joint dislocation (Rockwood typeⅢ)and compare the clinical effect of two different ways of coracoclavicular ligament reconstruction. Methods We select the patients with fresh Rockwood type Ⅲ to V dislocation of acromioclavicular joint from January 2008 to June 2013.After randomization,1 6 cases received the reconstruction of coracoclavicular and acromioclavicular ligament arthroscopically with semitendinosus tendon (autogenous group).Among them,12 were males and 4 were females,aged 1 6-62 years old,the average age is 39.8 years old.They were followed up for 9-39 months,the average follow-up was 25.6 months;13 cases underwent the reconstruction of coracoclavicular ligament with the double Endobutton plate and Ethibond suture (Ethibond suture group),including 9 cases of male,4 cases of female,aging from 1 9 to 57 years old,the average age is 36.5 years old,were followed up for 12-35 months with a mean follow-up of 1 9.6 months.The reason of injury:12 cases of traffic injuries,9 cases of sports injury,4 cases of fall,bruise in 2 cases and 2 cases of other injuries.The time between injury to operation was 3-1 1 d,averagely 6 d.8 patients were accompanied by SLAP injury of shoulder joint (5 cases of autologous ligament group,3 cases of Ethibond suture group),3 patients were accompanied by rotator cuff injury (1 cases of autologous ligament group,2 cases of Ethibond suture group).2 patients were combined with glenohumeral joint cartilage injury (1 case of autologous ligament group 1 case,1 case of love help group),2 patients were combined with Bankart injury (both in autologous ligament group ), 1 patient was combined with glenoid fracture (Ethibond suture group).The age,sex,cause of injury,injury side and time from getting injured to operation of the two groups are without significant differences (P >0

  16. [Arthroscopically assisted techniques for treatment of acute and chronic acromioclavicular joint injuries].

    Braun, S; Imhoff, A B; Martetschläger, F

    2015-05-01

    Acute and chronic acromioclavicular (AC) joint dislocation is frequently encountered in the routine clinical practice. This injury can lead to significant impairment of shoulder girdle function. Therapy based on the severity of injury is recommended to re-establish correct shoulder function. The static radiographic Rockwood classification is used to define the degree of dislocation but the clinical aspects and functional x-ray imaging of horizontal AC joint instability should also be considered for selection of the appropriate procedure. Rockwood grades I and II injuries are treated non-operatively with early functional exercise. The approach for Rockwood grade III injuries should be individual and patient-specific, with non-surgical procedures for low functional requirement patients with a high risk for surgical interventions. For patients with high demands on shoulder function surgery is recommended. A detailed diagnostic assessment frequently reveals Rockwood grade III injuries to be type IV injuries. Rockwood types IV and V AC joint dislocations require surgery for sustained stability. Treatment of acute injuries is recommended within 1-3 weeks after trauma but there is no clear evidence of a cut-off for the presence of chronic injuries. Various surgical techniques have been described in the literature. This article presents an arthroscopically assisted technique that addresses both vertical and horizontal instability of the AC joint. PMID:25964020

  17. Acromioclavicular joint acceleration-deceleration injury as a cause of persistent shoulder pain: Outcome after arthroscopic resection

    Ehud Atoun; Artan-Athanasios Bano; Alexander Van Tongel; Ali Narvani; Giuseppe Sforza; Ofer Levy

    2014-01-01

    Background: Shoulder pain in general and acromioclavicular joint (ACJ) pain specifically is common after acceleration-deceleration injury following road traffic accident (RTA). The outcome of surgical treatment in this condition is not described in the literature. The aim of the present study was to report the outcome of arthroscopic resection of the ACJ in these cases. Materials and Methods: Nine patients with localized ACJ pain, resistant to nonoperative treatment were referred on an a...

  18. Clinics in diagnostic imaging (151). Acromioclavicular joint geyser sign with chronic full-thickness supraspinatus tendon (SST) tear.

    Khor, Andrew Yu Keat; Wong, Steven Bak Siew

    2014-01-01

    An 82-year-old man presented with neck pain, right upper limb radiculopathy and right shoulder pain. Physical examination revealed a soft lump over the right shoulder joint, as well as reduced range of shoulder movements. On magnetic resonance imaging, the soft lump was shown to be a cystic mass over the acromioclavicular joint and was related to a full-thickness supraspinatus tendon tear. This is the classic geyser sign. The pathophysiology and clinical features of the geyser sign, and its i...

  19. Arthroscopic resection of the distal clavicle in osteoarthritis of the acromioclavicular joint

    Park, Tae-Soo; Lee, Kwang-Won

    2016-01-01

    Background: Symptomatic acromioclavicular joint (ACJ) lesions are a common cause of shoulder complaints that can be treated successfully with both conservative and surgical methods. There are several operative techniques, including both open and arthroscopic surgery, for excising the distal end of the clavicle. Here, we present a new modified arthroscopic technique for painful osteoarthritis of the ACJ and evaluate its clinical outcomes. Our hypothesis was that 4- to 7-mm resection of the distal clavicle in an en bloc fashion would have several advantages, including no bony remnants, maintenance of stability of the ACJ, and reduced prevalence of heterotopic ossification, in addition to elimination of the pathologic portion of the distal clavicle. Materials and Methods: 20 shoulders of 20 consecutive patients with painful and isolated osteoarthritis of the ACJ who were treated by arthroscopic en bloc resection of the distal clavicle were included in the study. There were 10 males and 10 females with an average age of 56 years (range 42–70 years). The mean duration of followup was 6 years and 2 months (range 4–8 years 10 months). The results were evaluated using the University of California Los Angeles (UCLA) shoulder rating score. Results: The overall UCLA score was 13.7 preoperatively, which improved to 33.4 postoperatively. All subscores were improved significantly (P painful osteoarthritis of the ACJ lesions in active patients engaged in overhead throwing sports and heavy labor. PMID:27512219

  20. Axial and tangential views of the acromioclavicular joint: the introduction of new projections

    CHEN Wei; ZHAGN Qi; SU Yan-ling; ZHANG Ze-kun; HOU Zhi-yong; PAN Jin-she; ZHANG Xiao-lin; ZHANG Ying-ze

    2012-01-01

    Background Routine anteroposterior radiographs of the acromioclavicular (AC) joint with or without weight bearing have limitations in demonstrating the AC joint.Transarticular fixation with Kirschner wire is a treatment choice for AC dislocations.However,percutaneous fixation of the AC joint is technically demanding.The C-arm fluoroscopy can be used as routine intraoperative guidance to facilitate this procedure.The current study aims to introduce new projections,the axial and tangential views of AC joint,to help evaluate the severity of the injury and facilitate the percutaneous procedure.Methods Three shoulder specimens were used to find the projection directions of the axial and tangential views of the AC joint by using the digital radiography (DR) unit.The axial and tangential views were taken of 20 adult volunteers by referencing the projection directions determined in the shoulder specimens.The angles showed on the DR system and the angles between the coronal plane of the body and the vertical plane of the flat panel detector (FPD) during taking these radiographs were recorded.The C-arm fluoroscopy unit was used to take the axial and tangential views referencing the angles measured on the DR system.Routine anteroposterior radiographs of the AC joint were taken on the volunteers.The minimal distances from the distal clavicle to the acromion were measured on both tangential and anteroposterior radiographs.The data was statistically analyzed.Results The clear axial and tangential radiographs of AC joints of the volunteers were obtained using both DR and C-arm fluoroscopy units.The angles demonstrated on the DR window are (20.8±2.4)° for male and (18.3±2.3)° for female.During taking the axial views,the angles between the coronal plane of the body and vertical plane of FPD are (23.3±3.2)° for male and (20.1±2.4)° for female.During taking tangential views,the corresponding angles are (117.5±3.7)° for male and (113.1±3.3)° for female.On the tangential

  1. Radiographic changes in the operative treatment of acute acromioclavicular joint dislocation – tight rope technique vs. K-wire fixation

    Operative treatment of higher degree acromioclavicular joint luxation is common. A new option is made available by the tight rope technique. It claims to provide adequate outcome with the use of a minimally invasive technique. First clinical studies justified its medical use, but the equivalence to established surgical methods remains unclear. We therefore analyzed radiographic data from patients that were treated with the tight rope system (TR) and compared them to those treated with K-wires (KW) fixation. Retrospective study with inclusion criteria: surgery for acromioclavicular joint luxation between 2004 and 2011, classified as Rockwood type III, no concomitant injury, first event injury. We compared pre- and post-operative X-rays with those taken at the end of treatment. Clinical data from follow-ups and radiographic data were evaluated. The main outcome variable was the remaining distance between the acromion and clavicle (ACD), as well as the coracoid process and clavicle (CCD). 27 patients (TR: n=16; KW: n=11) with comparable demographics and injury severity were included. Surgery reduced ACD (TR: p=0.002; KW: p<0.001) and CCD (TR: p=0.001; KW: p=0.003). Heterotopic ossification or postoperative osteolysis was not significantly associated with either one of the procedures. Three patients (18.75%) in the TR group showed impaired wound healing, migrating K-wires were recorded in 2 patients (18.2%) and impingement syndrome occurred in 1 patient (9.1%) with K-wires. Posttraumatic arthritis was not seen. There was a loss of reduction in 2 cases within the TR-group (12.51%) and 1 in the KW-group (9.1%). At last follow up, ACD and CCD were wider in both groups compared to the healthy side. This study shows that the Tight rope system is an effective alternative in the treatment of higher degree acromioclavicular luxation and comparable to the established methods

  2. Acromioclavicular joint separations grades I-III: a review of the literature and development of best practice guidelines.

    Reid, Duncan; Polson, Kate; Johnson, Louise

    2012-08-01

    Acromioclavicular joint (ACJ) separation injuries are common injuries among sporting populations. ACJ separations are graded according to severity from grade I being a mild sprain to grade VI, which is severe dislocation with displacement. There is consensus in the literature that grade I-III ACJ separations are managed conservatively and grades IV-VI are managed surgically. Despite conservative care being recommended for lesser grades of injury, there is very little evidence in the literature as to what constitutes conservative care. Therefore, the purpose of this paper was, first, to review the relevant anatomy and kinematics of the ACJ and, second, to review the literature relating to current evidence of conservative management of ACJ injury. Using this data, a best practice guideline for conservative rehabilitation in grade I-III ACJ separations was developed. For the conservative management, a literature search was undertaken using the following databases in the Auckland University of Technology's electronic library resources; MEDLINE, CINAHL, SPORTDiscus™ and the Cochrane Library. The following keywords or phrases were used: 'acromioclavicular joint separations', 'injury', 'dislocations', 'rehabilitation', 'conservative care', 'physiotherapy' and 'exercise'. A total of 24 articles was identified. There were no randomized controlled trials (RCTs) that investigated conservative treatment for grade I-III ACJ sprains. Therefore, a narrative review was formulated covering the anatomy and biomechanics of the ACJ, injury mechanisms and relevant literature reviewed covering rehabilitation principles. Conservative management of grade I-III ACJ separations is still the main recommendation following this review. A best practice guideline for managing grade I-III ACJ separations is presented to help guide clinicians until well constructed RCTs are carried out to improve the conservative management of ACJ injuries. PMID:22784232

  3. 关节镜下喙锁韧带增强术治疗肩锁关节脱位%Arthroscopic treatment of acute acromioclavicular joint dislocations by coracoacromial ligament augmentation and suture

    皇甫小桥; 赵金忠; 何耀华; 杨星光; 刘旭东; 刘闻欣; 王海明

    2013-01-01

    目的:研究关节镜下缝线钢板增强喙锁韧带术治疗肩锁关节脱位的近期治疗效果。方法2010年3月至2011年3月,在关节镜下使用膝关节韧带重建技术的缝线钢板(德国 ASCULAP 公司, B′BRAUN)增强重建喙锁韧带(三角韧带与斜方韧带),治疗 Rockwood Ⅲ型9例、Ⅴ型3例新鲜肩锁关节脱位。行 X线片、美国肩肘关节外科医师(America Shoulder Elbow Surgeons,ASES)评分和 Constant 评分,随访12~18个月。结果 ASES 评分:术前28.7分,术后86.9分;Constant 评分:术前24分,术后91分。治疗组 X线片显示,肩锁关节复位良好。术后1年,91.7%(11/12)病例获得满意治疗效果,83.3%(10/12)恢复到术前运动水平,仅有1例出现肩锁关节半脱位。结论关节镜下缝线钢板喙锁韧带增强术治疗肩锁关节脱位,早期可以获得满意的治疗效果,术后复位良好,并发症少。%Objective Acromioclavicular joint dislocation is commonly seen in shoulder joint injuries. Dysfunction as well as pain and discomfort usually occurred when the integrity of shoulder is damaged,for the acromioclavicular (AC)joint is involved in the connection between the scapula and the body as well as the activities of shoulder joint.Therefore,a consensus has been reached to treat severe AC joint dislocation by surgery.Based on different anatomical and functional cognition,methods for AC joint dislocation are various,which are typically performed by incision to reconstruct its stability and restore function.Attempts had been made by many doctors in the reconstruction of AC joint dislocation with the development of arthroscopy.From March 2010 to March 2011,obvious therapeutic effect was obtained in treating Rockwood type Ⅲ and Ⅴ AC joint dislocation arthroscopically with the suture plate used for the reconstruction of ligaments of knee joint to augment the reconstructed CC ligaments (conoid ligament and trapezoid ligament).Methods From March 2010 to March 2011

  4. Clinical results of coracoacromial ligament transfer in acromioclavicular dislocations: A review of published literature

    Sood Aman

    2008-01-01

    Full Text Available Acromioclavicular joint dislocations are common injuries, which typically occur with trauma in young men. Treatment recommendations for these injuries are highly variable and controversial. There are greater than 100 surgical techniques described for operative treatment of this injury. One of the most widely recommended methods of surgical reconstruction for acromioclavicular joint dislocations is to utilize the coracoacromial ligament for stabilization of the distal clavicle. Several modifications of this procedure have been described which have involved adjunct coracoclavicular fixation or fixation across acromioclavicular joint. Although the literature is replete with descriptive papers, there is paucity of studies evaluating the surgical outcome of this procedure. We systematically reviewed the English language published literature in peer reviewed journals (Medline, EMBASE, SCOPUS and assigned a level of evidence for available studies. We critically reviewed each paper for the flaws and biases and then evaluated the comparable clinical outcomes for various procedures and their modifications. The published literature consists entirely of case series (Level IV evidence with variability in surgical technique and outcome measures. On review there is low level evidence to support the use of coracoacromial ligament for acromioclavicular dislocation but it has been associated with high rate of deformity recurrence. Adjunct fixation does not improve clinical results when compared to isolated coracoacromial ligament transfer. This is in part because of the high incidence of fixation related complications. Similar results are reported with coracoacromial ligament reconstruction for acute and chronic cases. The development of secondary acromioclavicular joint symptoms with distal clavicle retention is poorly reported with the incidence rate varying from 12% to 32%. Despite this, the retention or excision of distal clavicle did not affect overall

  5. The relationship between chronic type III acromioclavicular joint dislocation and cervical spine pain

    Vestri Anna R

    2009-12-01

    Full Text Available Abstract Background This study was aimed at evaluating whether or not patients with chronic type III acromioclavicular dislocation develop cervical spine pain and degenerative changes more frequently than normal subjects. Methods The cervical spine of 34 patients with chronic type III AC dislocation was radiographically evaluated. Osteophytosis presence was registered and the narrowing of the intervertebral disc and cervical lordosis were evaluated. Subjective cervical symptoms were investigated using the Northwick Park Neck Pain Questionnaire (NPQ. One-hundred healthy volunteers were recruited as a control group. Results The rate and distribution of osteophytosis and narrowed intervertebral disc were similar in both of the groups. Patients with chronic AC dislocation had a lower value of cervical lordosis. NPQ score was 17.3% in patients with AC separation (100% = the worst result and 2.2% in the control group (p Conclusions Our study shows that chronic type III AC dislocation does not interfere with osteophytes formation or intervertebral disc narrowing, but that it may predispose cervical hypolordosis. The higher average NPQ values were observed in patients with chronic AC dislocation, especially in those that developed cervical hypolordosis.

  6. Treatment of Rockwood type Ⅲ acromioclavicular joint dislocation with endobutton technique%应用 Endobutton 带袢钢板技术治疗RockwoodⅢ型肩锁关节脱位

    宋哲; 张堃; 朱养均; 李忠; 庄岩; 魏巍; 杨娜

    2015-01-01

    ,distal clavicle and coracoid.The fascias of deltoid muscle and trapezius muscle were divided along the long axis of clavicle and the periosteum was stripped to expose the distal clavicle.The interal between deltoid and pectoralis major muscle was opened and the medial and lateral boarders of coracoid was prepared.The residual coraco-clavicle ligament was reserved.The articular space of acromioclavicular joint was examined and the ruptured fibrous cartilage disc was removed.After reduction of acromioclavicular joint,one Kirschner wire was drilled through the articular surface from the lateral end of acromion to provisionally keep the joint in place.A 1.0 mm guide pin was drilled from distal clavicle into the base of coracoid perpendicularly,3.5 mm canulated drill bit drilled a bone tunnel along the guiding pin.The distance from the surface of clavicle to the base of coracoid was measured with depth scale.The Endobutton was selected properly.A shuttle wire was used to pull the button loop out of clavicle and left the button under coracoid.The distal clavicle was reduced with compression.The loop was pulled upward and the other Endobutton without loop was put into the loop with acutenaculum.First,the Endobutton was laid on its side with sutures pierced through its two holes. Then the Endobutton was laid flat and made sure to attach to the base of coracoid without sliding.The sutures were tightened and knotted to make the Endobutton without loop fixed on the loop.The reconstruction of conoid ligament was finished.Then the suture on the coracoclavicular ligament was tightened and knotted.The wound was irrigated.The acromioclavicular joint capsule was repaired and the deltoid and trapezius muscle were reconstructed at the distal clavicle.The incision was closed layer by layer.(3 )Post-operative management and outcome evaluation:Antibiotics were given to prevent infection for 24-48 hours.The shoulder was protected by a sling for 1 -2 weeks.Pendulum exercise began after pain relief and

  7. Tratamento artroscópico da luxação acromioclavicular aguda com âncoras Arthroscopic treatment of acute acromioclavicular joint dislocation using suture anchors

    Leonardo Muntada Cavinatto

    2011-01-01

    Full Text Available OBJETIVO: Apresentar os resultados clínicos e radiográficos de uma série de casos com diagnóstico de Luxação Acromioclavicular (LAC Aguda, tratados através da fixação coracoclavicular com âncoras por via artroscópica. MÉTODO: Vinte pacientes apresentando LAC com menos de 30 dias de evolução foram operados pela técnica da estabilização coracoclavicular com âncoras por via artroscópica. Duas âncoras metálicas com dois fios cada, foram inseridas no coracóide. Os fios foram amarrados sobre a clavícula passando por túneis transósseos claviculares. Para a avaliação radiográfica, foi utilizada a medida comparativa da distância coracoclavicular com o lado contralateral e a avaliação funcional através dos escores de Constant e UCLA o seguimento foi de seis meses. RESULTADO: Dos vinte casos inicialmente selecionados, seis necessitaram de novo procedimento cirúrgico e foram excluídos do estudo. Dos quatorze pacientes restantes, apenas dois mantiveram redução da articulação acromioclavicular, enquanto os demais apresentaram algum grau de desvio no decorrer da evolução. Desconsiderando os pacientes excluídos, os escores de Constant e UCLA tiveram média 94,79 (82-100 e, 32,64 (26-35, respectivamente. CONCLUSÃO: A técnica apresentou um alto índice de perda da redução ao longo da evolução de seis meses. A avaliação funcional apresentou resultado satisfatório com escore médio elevado de Evidência: Nível de Evidência: Nível III, estudo retrospectivo.OBJECTIVE: To present the clinical and radiographic results of a case series of patients with acute acromioclavicular dislocation (AAD treated by arthroscopic coracoclavicular fixation with suture anchors. METHOD: Twenty patients with AAD with less than 30 days since the injury were submitted to a coracoclavicular stabilization procedure using 2 suture anchors placed at the base of the coracoid process. Each suture anchor was connected to 2 strands of No.2

  8. The morphologic and radiologic evaluation of the acromioclavicular joint in healthy individuals

    Yucel, Mustafa

    2004-01-01

    The topographic and functional anatomy and the age depended osteoarthrosis of the right acromioclaviculer joint has been examined on 39 dead bodies by means of anatomopathologic and radiologic tools. The AC joints have been extirpated in to, fixed in formalin and pinned in the horizontal plane; they have been arthrotomizedn and the macroscopic view of the joint surface photographed. Subsequently, the joint surfaces have been lamellized in the frontal plane, and decalcified; three different h...

  9. Treatment of Chronic Acromioclavicular Joint Dislocation in a Paraplegic Patient with the Weaver-Dunn Procedure and a Hook-Plate

    Godry, Holger; Citak, Mustafa; Königshausen, Matthias; Schildhauer, Thomas A.; Seybold, Dominik

    2016-01-01

    In case of patients with spinal cord injury and concomitant acromioclavicular (AC) joint-dislocation the treatment is challenging, as in this special patient group the function of the shoulder joint is critical because patients depend on the upper limb for mobilization and wheelchair-locomotion. Therefore the goal of this study was to examine, if the treatment of chronic AC-joint dislocation using the Weaver-Dunn procedure augmented with a hook-plate in patients with a spinal cord injury makes early postoperative wheelchair mobilization and the wheelchair transfer with full weight-bearing possible. In this case the Weaver-Dunn procedure with an additive hook-plate was performed in a 34-year-old male patient with a complete paraplegia and a posttraumatic chronic AC-joint dislocation. The patient was allowed to perform his wheelchair transfers with full weight bearing on the first post-operative day. The removal of the hook-plate was performed four months after implantation. At the time of follow-up the patient could use his operated shoulder with full range of motion without restrictions in his activities of daily living or his wheel-chair transfers. PMID:27433301

  10. Mid-term results after operative treatment of rockwood grade III-V Acromioclavicular joint dislocations with an AC-hook-plate

    Kienast B

    2011-02-01

    Full Text Available Abstract Acromioclavicular joint dislocations often occur in athletic, young patients after blunt force to the shoulder. Several static and dynamic operative procedures with or without primary ligament replacement have been described. Between February 2003 and March 2009 we treated 313 patients suffering from Rockwood III-V lesions of the AC joint with an AC-hook plate. 225 (72% of these patients could be followed up. Mean operation time was 42 minutes in the conventional group and 47 minutes in the minimal invasive group. The postoperative pain on a scale from 1 to 10 (VAS-scale was rated 2.7 in the conventional group and 2.2 in the minimal invasive group. Taft score showed very good and good results in 189 patients (84%. Constant score showed an average of 92.4 of 100 possible points with 89% excellent and good results and 11% satisfying results. All patients had some degree of pain or discomfort with the hookplate in place. These symptoms were relieved after removal of the plate. The overall complication rate was 10.6%. There were 6 superficial soft tissue infections, 1 fracture of the acromion, 7 redislocations after removal of the hook-plate. We observed 4 broken hooks which could be removed at the time of plate removal, 4 seromas and 2 cases of lateral clavicle bone infection, which required early removal of the plate. We can conclude that clavicle hook plate is a convenient device for the surgical treatment of Rockwood Grade III-V dislocations, giving good mid-term results with a low overall complication rate compared to the literature. Early functional therapy is possible and can avoid limitations in postoperative shoulder function.

  11. 关节镜下四骨道双束固定治疗急性肩锁关节Rockwood Ⅴ型脱位%Arthroscopic fixation in the treatment of Rockwood Ⅴ acute acromioclavicular joint dislocation

    陆伟; 王大平; 朱伟民; 欧阳侃; 柳海峰; 彭亮权; 李皓; 冯文哲

    2014-01-01

    Background Treatment methods for acromioclavicular joint dislocation of Rockwood type V are numerous.The commonly used is the open surgery with large trauma (by clavicular hook plate fixation).In recent years,some scholars use clavicle-coracoid screws fixation method under arthroscopy,but the screws need to be removed after 6 weeks; there are also scholars using arthroscopic double Endobutton loops single bundle fixation method with good effect,but they found suture rupture between the Endobutton,redislocation or fracture,bone absorption under the loops in some patients. This article investigates the method of arthroscopic procedure with four-tunnel quadruple double-bundle Endobutton double-bundle fixation via self-designed positioning apparatus in the treatment of acute acromioclavicular joint (ACJ)Rockwood Ⅴ degree dislocations and their short-term therapeutic effect.Methods (1)Patient selection:12 patients (9 male and 3 female)with acute acromioclavicular joint dislocation of Rockwood type V were selected from October 2010 to June 2013. Their average age is 28.2 years.with sports injury in 10 cases and fall injury in 2 cases.All patients received surgical repair within 2 weeks after injury.The operations were performed by the same senior surgeon.(2)Preoperative bone tunnel positioning design:All patients had CT scan in the position of 90°internal rotating of bilateral shoulder joint (palm down).Measure the angle of scapular long axis and coronal section (A)separately,make the line in the coracoid neck parallel to the long axis of scapula (S),and then measure the width of parallel line in the part of coracoid neck (P).The midpoint of the coracoid neck is the center between the two preparatively drilled bone tunnels.Make the cross line vertical to line P,and the bone tunnels are located in the I and II quadrant.The distance between two bone tunnels is 6 mm.(3 )Surgical techniques:According to the data of preoperative measurement of bone tunnel,the self

  12. The treatment of the acute acromioclavicular joint dislocation with LARS artificial ligament:a preliminary report%应用LARS人工韧带治疗急性肩锁关节脱位的初步报告

    陈爱民; 鹿楠; 叶添文; 杨鹏; 朱磊; 李菁

    2014-01-01

    Background Currently,the clinical perspectives of surgical treatment for Tossy Ⅲacromioclavicular(AC)joint dislocations are relatively identical.Due to the post-traumatic ruptures of the acromioclavicular ligament and coracoclavicular(CC)ligament which are used to maintain stability of the joint,the clavicle moves backward and upward,and the upper arm and the scapula drops downward for the gravity of the upper arm and the influence of the sternocleidomastoid muscle.Since such complications as reduction difficulties,redislocation after external fixation,pressure ulcers of the skin,and so forth are particularly prone to occur in the conservative therapy,the operative treatment is more inclined to be adopted for the Tossy Ⅲ dislocation of the AC joint.With the single repair and fixation of the CC ligament,redislocation is likely to happen after implant removal because the ruptured ligaments healed as scar tissue.Therefore,this study uses an operative method of reconstructing and augmenting the CC ligament with LARS artificial ligament for the treatment of Tossy Ⅲ AC joint dislocation,and evaluates its clinical effect.Methods From November 2006 to July 2009,8 patients with acute AC joint dislocation of Tossy Ⅲ were admitted into our hospital.Five patients were male and 3 were female,and their ages ranged from 21 to 45.Sides:3 injuries were on the left and 5 were on the right.Seven patients suffered from falling on the ground,and 1 patient was inj ured in a traffic accident.All the patients were treated with LARS artificial ligaments to reconstruct the CC ligament.Constant score and VAS score were adopted in clinical evaluation.Zanca view of the bilateral AC joint and the axillary radiograph of the affected shoulder joint were employed for imaging evaluation.All the patients were simple Tossy Ⅲ dislocation of AC joint with no trauma of other parts and skin breakdown.Regular pre-operative examinations and evaluations were carried out after admission,and LARS

  13. BIOLOGIC JOINT RECONSTRUCTION: ALTERNATIVES TO ARTHROPLASTY

    Brian J. Cole

    2009-06-01

    limited prosthetic resurfacing. Section VI is "Operative treatment-elbow" including chapters arthroscopy, nonprosthetic elbow arthroplasty, biological resurfacing. The Section VII is "Operative treatment-foot and ankle" including chapters about ankle arthroscopy and cartilage repair in the ankle.The text is one of the most comprehensive and up-to-date references in the treatment of cartilage pathologies and biological joint reconstruction. Some other minimal invasive surgical techniques such as prosthetic partial resurfacing or some osteotomies are also subjected as other alternative treatments for joint restoration. Basic sciences, diagnostic imaging, pharmacological treatment and neutraceuticals, and rehabilitation are making the text. The chapter about future developments in cartilage repair is not only describing the recent technology, different types of tissue engineering and related centers in the world but also gives an idea for the possibilities of future in cartilage repair. Chapters about surgical techniques and procedures are uniformly composed of parts including introduction, preoperative evaluation, surgical technique, postoperative issues, results and references in which the techniques and management described in detail. Numerous high quality images, rich illustrations and figures, page design and also colored tables about key points, protocols, or helpful hints makes the reading and understanding easier

  14. Type RockwoodIII in the treatment of small incision of clavicular hook plate for acromioclavicular joint dislocation in 66 cases%小切口锁骨钩钢板治疗RockwoodIII型肩锁关节脱位66例

    李克军; 邹方亮; 邹孝军; 杨志乐

    2013-01-01

      Objective To summarize the operation method and clinical effect of dislocation of small incision of clavicular hook plate in treatment of type RockwoodIII shoulder. Methods From 2004 January ~ 2012 year in January, the treatment of 66 cases of RockwoodIII type acromioclavicular joint dislocation were treated with clavicular hook plate, with only the clavicular hook plate, repair of acromioclavicular joint capsule and the acromioclavicular ligament, not deliberately repair of coracoclavicular ligament. Reset X ray to evaluate the postoperative dislocation of acromioclavicular joint, shoulder joint function exercise. Remove the clavicular hook plate in 9 ~ 18 months after operation, 11 months after operation on the average. Through the bilateral shoulder joints in patients with normal and weight-bearing flms, evaluation of acromioclavicular joint dislocation after operation, after taking out the internal fixation of shoulder joint function and repair and no repair of coracoclavicular ligament of shoulder joint function infuence. Results All cases were followed up, followed up for 15 ~ 32 months, an average of 20 months follow-up, according to the function evaluation standard patients, excellent in 40 cases, good in 26 cases. Conclusion The small incision of clavicular hook plate in treatment of acromioclavicular joint dislocation with RockwoodIII type acromioclavicular joint anatomic and biomechanical characteristics, reliable fxation, coracoclavicular ligament can repair, postoperative early functional exercise, is worthy of promotion.%  目的总结小切口锁骨钩钢板治疗RockwoodIII型肩锁关节脱位的手术方法和临床疗效。方法2004年1月至2012年1月,应用锁骨钩钢板治疗66例RockwoodIII型肩锁关节脱位,术中仅行锁骨钩钢板固定,修复肩锁关节关节囊和肩锁韧带,未刻意修复喙锁韧带。术后X光片评估肩锁关节脱位的复位,行肩关节功能锻炼。锁骨钩钢板在术后9~18

  15. Complications following arthroscopic fixation of acromioclavicular separations: a systematic review of the literature

    Woodmass JM

    2015-04-01

    Full Text Available Jarret M Woodmass,1 John G Esposito,1 Yohei Ono,1,2 Atiba A Nelson,1 Richard S Boorman,1 Gail M Thornton,1,3 Ian KY Lo1 1Department of Surgery, Section of Orthopaedic Surgery, McCaig Institute for Bone and Joint Health, University of Calgary, Calgary, AB, Canada; 2Department of Orthopaedic Surgery, Nagoya University Graduate School of Medicine, Nagoya, Japan; 3Department of Orthopaedics, University of British Columbia, Vancouver, BC, Canada Purpose: Over the past decade, a number of arthroscopic or arthroscopically assisted reconstruction techniques have emerged for the management of acromioclavicular (AC separations. These techniques provide the advantage of superior visualization of the base of the coracoid, less soft tissue dissection, and smaller incisions. While these techniques have been reported to provide excellent functional results with minimal complications, discrepancies exist within the literature. This systematic review aims to assess the rate of complications following these procedures. Methods: Two independent reviewers completed a search of Medline, Embase, PubMed, and the Cochrane Library entries up to December 2013. The terms “Acromioclavicular Joint (MeSH” OR “acromioclavicular* (text” OR “coracoclavicular* (text” AND “Arthroscopy (MeSH” OR “Arthroscop* (text” were used. Pooled estimates and 95% confidence intervals were calculated assuming a random-effects model. Statistical heterogeneity was quantified using the I2 statistic. Level of evidence: IV Results: A total of 972 abstracts met the search criteria. After removal of duplicates and assessment of inclusion/exclusion criteria, 12 articles were selected for data extraction. The rate of superficial infection was 3.8% and residual shoulder/AC pain or hardware irritation occurred at a rate of 26.7%. The rate of coracoid/clavicle fracture was 5.3% and occurred most commonly with techniques utilizing bony tunnels. Loss of AC joint reduction occurred in 26

  16. COMPARATIVE ANALYSIS OF AUTOGRAFT TECHNIQUE AND CLAVICULAR HOOK PLATE IN GRADE 3 ACROMIOCLAVICULAR DISLOCATIONS

    Rahul Narayan

    2016-04-01

    Full Text Available OBJECTIVE To evaluate clinical outcome of clavicular hook plate and autograft technique in the surgical treatment of Rockwood Grade-III acromioclavicular joint dislocation. METHODS Fifteen patients were operated using standard clavicular hook plate and another fifteen patients were operated using autograft technique. After a minimum follow-up of one year, clinical assessment was done using Constant-Murley Score. Statistical evaluation was done using SPSS ver. 21.0. RESULTS Mean age group was 31.44±7.8 years. Average constant shoulder score for the hook plate group was 81.3 (Range 74–89 and that for autograft technique group was 91.7 (Range 88–97. CONCLUSION Autograft technique was found to be superior in terms of functional outcome when compared to clavicular hook plate. Such superiority can be attributed to the biologic nature of coracoclavicular ligament reconstruction in the autograft technique.

  17. Ankle and shoulder joint reconstruction using soft tissue allografts

    Full text: Lateral Collateral Ligament Insufficiency is a common complication of injury to the ankle joint. This needs reconstruction of the torn ligament as the joint instability gives rise to frequent giving way at the ankle joint. It can be reconstructed using autologous peroneus brevis tendon. The authors prefer to reconstruct using deep frozen (-80 degree C) non-gamma irradiated tibialis anterior or tibialis posterior tendon allograft procured by NUH Tissue Bank. The graft must be at least between 18-22 cm long. The procedure employed is a first stage Brostrom Procedure repairing the anterior talo-fibula ligament using Mitek sutures. In the second stage the Calcaneofibular ligament is reconstructed using a figure of eight tendon reconstruction via drill holes in the fibular above and the calcaneum below. Twelve cases have been reconstructed this way with good results. When injury is sustained to the Acromia-clavicular (AC) Joint, for type 3 to 5 AC Joint Dislocation and in manual labourers, reconstruction is needed. The author's preferred method is a 2 stage procedure using deep frozen (-80 degree C), non gamma-irradiated fascia lata allografts procured by NUH Tissue Bank. In the first stage the dislocated AC Joint is reduced and held in position by transfixation using 2 baby Steinmann Pins and repair of torn corac clavicular ligaments. The second stage consisted of reconstruction with rolled-up fascia lata figure of eight allograft tendon between the clavicle and the coracoid process. The 2 pins are removed after 6 weeks and the shoulder mobilised. 10 cases have been done with good results. Two cases showed mild subluxation of the AC joint due to slight loss of the reduction performed during the operation. (Author)

  18. Diagnostic challenges in acromioclavicular septic arthritis.

    Williams, Mark

    2016-01-01

    A 69-year-old man with Klinefelter's syndrome presented with a painful shoulder and staphylococcal sepsis. He received intravenous antibiotics while investigations were performed to locate the source of infection. MRI demonstrated infection in the acromioclavicular joint (ACJ). The patient clinically improved and a further 5 weeks of oral antibiotics were given. He remained asymptomatic at 2-year follow-up. Although ACJ septic arthritis is rare, independent of immune-competent status, a high index of suspicion is essential for prompt diagnosis. The condition presents additional diagnostic challenges due to unfamiliarity, the challenges of interpreting imaging, desire for radiological guided arthrocentesis and low volume aspirates. Overcoming these pitfalls is essential to avoid significant morbidity and mortality. PMID:27257000

  19. Systematics of glenohumoral and acromioclavicular arthritis

    A common risk factor for osteoarthritis (OA) of the glenohumeral joint is instability and is often observed as a sequel to dislocation. Altered biomechanics will ultimately result in joint degeneration including osteophyte development at the lower margin of the humerus, glenoidal cartilage loss and surface deformity. An OA of the glenohumeral joint is often coexistent with soft tissue derangement of the shoulder. In advanced stages defects of the rotator cuff and OA of the glenohumeral joint may accelerate disease progression. Degenerative changes of the acromioclavicular joint (AC joint) are commonly seen in older persons with only modest correlation with clinical symptoms. Symptomatic OA of the AC joint is often concomitantly observed with degenerative changes of the glenohumeral joint. Standard radiographs are the basis of a structural assessment of shoulder OA but lack correlation with clinical symptoms and are insensitive for the detection of early degenerative changes. Magnetic resonance imaging (MRI) provides increased sensitivity for the detection of cartilage defects and reveals relevant soft tissue changes, such as lesions of the glenoid labrum and capsuloligamentous structures, which are seen in conjunction with instability. It is also the method of choice to detect clinically relevant bone marrow edema-like lesions or synovial changes that are associated with symptomatic OA. Standard radiographs are not applicable for detection of early degenerative changes. Once OA is suspected clinically, MRI is the method of choice for further structural assessment. The administration of an intravenous contrast agent is useful for assessing synovitis, which commonly correlates with clinical disease manifestations. For preoperative and surgical planning of joint replacement, MRI or CT should be used. (orig.)

  20. Relação anatômica do nervo supraescapular com o processo coracoide, articulação acromioclavicular e acrômio Anatomical relationship of the suprascapular nerve to the coracoid process, acromio clavicular joint and acromion

    Bernardo Barcellos Terra

    2010-06-01

    Full Text Available OBJETIVO: Estabelecer a relação anatômica do nervo supraescapular (NSE localizado na fossa supraescapular com a borda medial da base do coracoide, face articular acromial da articulação acromioclavicular e a borda anterolateral do acrômio. MÉTODOS: Foram dissecados 16 ombros de 16 cadáveres, sendo nove masculinos e sete femininos, mensurando com auxílio do paquímetro a distância do nervo supraescapular (na sua passagem sob o ligamento transverso com pontos fixos determinados na borda medial da base do processo coracoide, na face articular do acrômio da articulação acromioclavicular e na borda anterolateral do acrômio, correlacionando com a idade e o sexo. Foram excluídos cadáveres com intervenção cirúrgica prévia. RESULTADOS: Com relação à medida do nervo supraescapular, na sua fossa à borda medial da base do processo coracoide, obtivemos uma média de 3,9cm (variando de 3,1cm a 5,2cm; com relação à articulação acromioclavicular, a média foi de 4,7 (3,9cm a 5,2cm; e, com relação à borda anterolateral do acrômio, a média foi de 6,1cm (5,7cm a 6,8cm. CONCLUSÃO: É fundamental o conhecimento exato da anatomia dos nervos da região anterior do ombro para evitar lesões iatrogênicas e para conseguir resultados satisfatórios no tratamento cirúrgico das doenças do ombro, seja ele realizado de forma aberta ou artroscópica.OBJECTIVE: To establish the anatomic relationship of the suprascapular nerve (SSN located in the suprascapular notch to the medial border of the base of the coracoid process, the medial acromial surface of the acromioclavicular joint and the anterolateral edge of the acromion. METHODS: We dissected 16 shoulders of 16 cadavers, 9 males and 7 females. The distance from the suprascapular nerve (in its course beneath the transverse ligament to certain fixed points in the medial base of the coracoid process was measured with the aid of a caliper, as well as to the articular surface of the acromion

  1. Elbow joint stability following experimental osteoligamentous injury and reconstruction

    Deutch, Søren R; Jensen, Steen Lund; Tyrdal, Stein; Olsen, Bo S; Sneppen, Otto

    2003-01-01

    Elbow joint dislocation was simulated in cadaveric specimens to quantify laxity induced by radial head and coronoid process lesions, either alone or in combination with collateral ligament insufficiency. The effects of lateral ligament reconstruction and radial head prosthesis replacement were al...

  2. Elbow joint stability following experimental osteoligamentous injury and reconstruction

    Deutch, Søren R; Jensen, Steen Lund; Tyrdal, Stein;

    2003-01-01

    Elbow joint dislocation was simulated in cadaveric specimens to quantify laxity induced by radial head and coronoid process lesions, either alone or in combination with collateral ligament insufficiency. The effects of lateral ligament reconstruction and radial head prosthesis replacement were also...

  3. Immediate function of temporomandibular joint after total resection and reconstruction

    Richter, M.; Dulguerov, Pavel; Pittet Cuenod, Brigitte Maud; Becker, Minerva

    1997-01-01

    Two patients with recurrent parotid gland carcinoma required subtotal petrosectomy and infratemporal fossa type C approach. To achieve en bloc resection, the ascending mandibular ramus and the entire temporomandibular joint, including the adjacent temporal bone, were removed. An original technique for immediate reconstruction of the infratemporal region, including the glenoid fossa and the ramus of the mandible, is described. Rigid fixation, as well as good functional and aesthetic results, w...

  4. Joint Image Reconstruction and Segmentation Using the Potts Model

    Storath, Martin; Frikel, Jürgen; Unser, Michael

    2014-01-01

    We propose a new algorithmic approach to the non-smooth and non-convex Potts problem (also called piecewise-constant Mumford-Shah problem) for inverse imaging problems. We derive a suitable splitting into specific subproblems that can all be solved efficiently. Our method does not require a priori knowledge on the gray levels nor on the number of segments of the reconstruction. Further, it avoids anisotropic artifacts such as geometric staircasing. We demonstrate the suitability of our method for joint image reconstruction and segmentation from limited data in x-ray and photoacoustic tomography. For instance, our method is able to reconstruct the Shepp-Logan phantom from $7$ angular views only. We demonstrate the practical applicability in an experiment with real PET data.

  5. Bayesian PET image reconstruction incorporating anato-functional joint entropy

    Tang, Jing; Rahmim, Arman

    2009-12-01

    We developed a maximum a posterior (MAP) reconstruction method for positron emission tomography (PET) image reconstruction incorporating magnetic resonance (MR) image information, with the joint entropy between the PET and MR image features serving as the regularization constraint. A non-parametric method was used to estimate the joint probability density of the PET and MR images. Using realistically simulated PET and MR human brain phantoms, the quantitative performance of the proposed algorithm was investigated. Incorporation of the anatomic information via this technique, after parameter optimization, was seen to dramatically improve the noise versus bias tradeoff in every region of interest, compared to the result from using conventional MAP reconstruction. In particular, hot lesions in the FDG PET image, which had no anatomical correspondence in the MR image, also had improved contrast versus noise tradeoff. Corrections were made to figures 3, 4 and 6, and to the second paragraph of section 3.1 on 13 November 2009. The corrected electronic version is identical to the print version.

  6. Acromioclavicular Joint Dislocation of Types Rockwood Ⅲ, Ⅳ and Ⅴ Treated with Coracoclavicular Bolt Combined with Beak-shoulder Ligament Shif%喙锁螺钉结合喙肩韧带移位治疗Rockwood Ⅲ型、Ⅳ型、Ⅴ型肩锁关节脱位

    谢伟; 郑建平; 黎高明; 吴向科; 傅格深

    2012-01-01

    [目的]探讨喙锁螺钉结合喙肩韧带移位治疗RockwoodⅢ型、Ⅳ型、Ⅴ型肩锁关节脱位的临床疗效.[方法]对32例RockwoodⅢ型、Ⅳ型、Ⅴ型肩锁关节脱位患者采用喙锁螺钉结合喙肩韧带移位治疗,采用Karlasson标准,分析其临床疗效.[结果]术后随访9~21个月,平均13个月,其中A级28例,B级4例,术后均未出现神经血管损伤、螺钉失败等严重并发症.[结论]喙锁螺钉结合喙肩韧带移位是治疗肩锁关节脱位一种有效的治疗方法.%[Objective] To investigate the effects of acromioclavicular joint dislocation of types Rockwood Ⅲ, IV and V treated with coracoclavicular bolt combined with beak-shoulder ligament shift. [Method] Take Karlasson standard to 32 cases, analyse the clinical effect. [Result]Followed up for 9~ 21m after operation, 28 cases were of level A, 4 level B, without nerve or vessel injury or failure bolt or other severe complication. [Conclusion] Coracoclavicular bolt combined with beak-shoulder ligament shift is an effective method for acromioclavicular joint dislocation.

  7. Joint regularization for spectro-temporal CT reconstruction

    Clark, D. P.; Badea, C. T.

    2016-03-01

    X-ray CT is widely used, both clinically and preclinically, for fast, high-resolution, anatomic imaging; however, compelling opportunities exist to expand its use in functional imaging applications. For instance, spectral information combined with nanoparticle contrast agents enables quantification of tissue perfusion levels, while temporal information details cardiac and respiratory dynamics. In previous work, we proposed and demonstrated a projection acquisition and reconstruction strategy for 5D CT (3D + dual-energy + time) which recovered spectral and temporal information without substantially increasing radiation dose or sampling time relative to anatomic imaging protocols. The approach relied on the approximate separability of the temporal and spectral reconstruction sub-problems, which enabled substantial projection undersampling and effective regularization. Here, we extend this previous work to more general, nonseparable 5D CT reconstruction cases (3D + muti-energy + time) with applicability to K-edge imaging of exogenous contrast agents. We apply the newly proposed algorithm in phantom simulations using a realistic system and noise model for a photon counting x-ray detector with six energy thresholds. The MOBY mouse phantom used contains realistic concentrations of iodine, gold, and calcium in water. Relative to weighted least-squares reconstruction, the proposed 5D reconstruction algorithm improved reconstruction and material decomposition accuracy by 3-18 times. Furthermore, by exploiting joint, low rank image structure between time points and energies, ~80 HU of contrast associated with the Kedge of gold and ~35 HU of contrast associated with the blood pool and myocardium were recovered from more than 400 HU of noise.

  8. Joint image reconstruction and sensitivity estimation in SENSE (JSENSE).

    Ying, Leslie; Sheng, Jinhua

    2007-06-01

    Parallel magnetic resonance imaging (pMRI) using multichannel receiver coils has emerged as an effective tool to reduce imaging time in various applications. However, the issue of accurate estimation of coil sensitivities has not been fully addressed, which limits the level of speed enhancement achievable with the technology. The self-calibrating (SC) technique for sensitivity extraction has been well accepted, especially for dynamic imaging, and complements the common calibration technique that uses a separate scan. However, the existing method to extract the sensitivity information from the SC data is not accurate enough when the number of data is small, and thus erroneous sensitivities affect the reconstruction quality when they are directly applied to the reconstruction equation. This paper considers this problem of error propagation in the sequential procedure of sensitivity estimation followed by image reconstruction in existing methods, such as sensitivity encoding (SENSE) and simultaneous acquisition of spatial harmonics (SMASH), and reformulates the image reconstruction problem as a joint estimation of the coil sensitivities and the desired image, which is solved by an iterative optimization algorithm. The proposed method was tested on various data sets. The results from a set of in vivo data are shown to demonstrate the effectiveness of the proposed method, especially when a rather large net acceleration factor is used. PMID:17534910

  9. COMPARATIVE ANALYSIS OF AUTOGRAFT TECHNIQUE AND CLAVICULAR HOOK PLATE IN GRADE 3 ACROMIOCLAVICULAR DISLOCATIONS

    Rahul Narayan; Ojas

    2016-01-01

    OBJECTIVE To evaluate clinical outcome of clavicular hook plate and autograft technique in the surgical treatment of Rockwood Grade-III acromioclavicular joint dislocation. METHODS Fifteen patients were operated using standard clavicular hook plate and another fifteen patients were operated using autograft technique. After a minimum follow-up of one year, clinical assessment was done using Constant-Murley Score. Statistical evaluation was done using SPSS ver. 21.0. RES...

  10. [Reconstructive surgery in war injuries of the bones and joints].

    Korzinek, K

    1992-01-01

    The basic problems of bone-and-joint surgery with special emphasis on war injuries and the role of reconstructive surgery in relieving the gravest consequences of war injuries are discussed. Since bone and joint injuries rank high among the war injuries with a share of over 70% including more than 30% of fractures, they pose not only a serious medical and surgical but also a major public health problem. The economic and social consequences of these injuries are further aggravated by the necessity for prolonged treatment and multiple surgical interventions. The basic preconditions which must be fulfilled for bone healing to take place are discussed in the light of the ultimate goal of all therapeutic efforts. i.e. restoration of full functional ability of the injured extremity. The importance of bone fragment immobilization for the process of bone healing is emphasized. Impaired bone healing, resulting from insufficient immobilization or inadequate reposition of bone fragments, is a common problem with war fractures, mainly because of the great forces involved and extensive destruction of bone and all other surrounding tissues. One of the main features of war fractures is delayed bone healing caused by massive circulatory defects in the injured bone. Some special problems attending war injuries, such as pseudarthroses and associated defects, soft tissue infections and defects, may only be effectively solved by cooperation with a plastic-vascular- or neurosurgeon. In one and joint surgery profound understanding of the physiology, pathophysiology and biomechanics of bone healing, knowledge of modern methods of osteosynthesis, skill in the management of bone and other infections as well as knowledge of the latest developments in postoperative care are essential for achieving satisfactory therapeutic results. Availability of various implants and a wide range of surgical instruments is a precondition which needs no further discussion. It is only in this way that the most

  11. Fratura extra-articular da extremidade medial da clavícula associada à luxação acromioclavicular tipo IV: relato de caso Extra-articular fracture of the medial end of the clavicle associated with type IV acromioclavicular dislocation: case report

    Mário Chaves Correa

    2011-10-01

    months after the surgery, the patient was asymptomatic, with full active and passive mobility, and normal strength and endurance of the shoulder girdle. Radiographs and a three-dimensional CT scan showed persistent posterosuperior subluxation of the acromioclavicular joint and anatomical consolidation of the clavicular fracture.

  12. Joint reconstruction strategy for structured illumination microscopy with unknown illuminations

    Labouesse, Simon; Idier, Jérôme; Bourguignon, Sébastien; Negash, Awoke; Liu, Penghuan; Sentenac, Anne

    2016-01-01

    The blind structured illumination microscopy (SIM) strategy proposed in (Mudry et al., 1992) is drastically revisited in this paper, unveiling the mechanism that drives the super-resolution in the method. A much improved numerical implementation is also provided for the reconstruction problem under the image positivity constraint. This algorithm rests on a new preconditioned proximal iteration faster than existing solutions, paving the way to 3D and real-time 2D reconstruction.

  13. Joint Line Reconstruction in Navigated Total Knee Arthroplasty Revision

    2012-05-16

    Revision Total Knee Arthroplasty Because of; Loosening; Instability; Impingement; or Other Reasons Accepted as Indications for TKA Exchange.; The Focus is to Determine the Precision of Joint Line Restoration in Navigated vs. Conventional Revision Total Knee Arthroplasty

  14. A comparative study of three-dimensional reconstructive images of temporomandibular joint using computed tomogram

    The purpose of this study was to clarify the spatial relationship of temporomandibular joint and to an aid in the diagnosis of temporomandibular disorder. For this study, three-dimensional images of normal temporomandibular joint were reconstructed by computer image analysis system and three-dimensional reconstructive program integrated in computed tomography. The obtained results were as follows : 1. Two-dimensional computed tomograms had the better resolution than three dimensional computed tomograms in the evaluation of bone structure and the disk of TMJ. 2. Direct sagittal computed tomograms and coronal computed tomograms had the better resolution in the evaluation of the disk of TMJ. 3. The positional relationship of the disk could be visualized, but the configuration of the disk could not be clearly visualized on three-dimensional reconstructive CT images. 4. Three-dimensional reconstructive CT images had the smoother margin than three-dimensional images reconstructed by computer image analysis system, but the images of the latter had the better perspective. 5. Three-dimensional reconstructive images had the better spatial relationship of the TMJ articulation, and the joint space were more clearly visualized on dissection images.

  15. 应用不同手术方法治疗陈旧性肩锁关节脱位的疗效分析%Review of the results of different operative procedures for old acromioclavicular dislocation

    吴其常; 卞传华; 苗旭漫

    2001-01-01

    目的比较分析应用不同手术方法治疗陈旧性肩锁关节脱位的疗效。方法对43例陈旧性肩锁关节脱位患者分别应用单纯切开复位克氏针内固定(9例);切开复位内固定并肩锁关节韧带重建(14例);切开复位内固定并喙突上移(20例)三种手术方法进行治疗,术后平均随访4.8年,对其自觉症状、上肢肌力、肩关节功能和肩锁关节间隙等改善程度进行比较。结果三种术式的优良率分别为33%(3/9)、50%(7/14)和74%(15/20)。单纯切开复位克氏针内固定法的疗效与切开复位内固定并肩锁韧带重建法相比,差异无显著性意义(P>0.05),两者与切开复位内固定并喙突上移法比较,差异有显著性意义(均P 0.05). Modified Dewar's operation was better compared with Kirschner wire fixation and reconstruction of acromioclavicular ligament (P< 0.05). Conclusion A satisfactory surgical procedure for treatment of old acromioclavicular dislocation should accomplish the following points: removal of scar tissue and intra articular cartilaginous fragments, reconstruction of joint stability and effective internal fixation until complete healing of the ligament structures.

  16. Reconstructing mandibular anterior region by Branemark and Bonefit joint implants: a case report

    AR. Rokn

    1998-04-01

    Full Text Available   A 48 year old patient was candidate for anterior mandibular reconstruction by 2 fixtures of Branemark implant. Residual infection lead to removal of one of the implants from the extracted tooth socket. Afterwards, 2 fixtures of Bonefit was inserted adjacent to previously placed Branemark implants and final prosthesis were loaded in a joint cemented and screwed design.

  17. Immediate effects of neuromuscular joint facilitation intervention after anterior cruciate ligament reconstruction.

    Wang, Lei

    2016-07-01

    [Purpose] The aim of this study was to examine the immediate effects of neuromuscular joint facilitation (NJF) on the functional activity level after rehabilitation of anterior cruciate ligament (ACL) reconstruction. [Subjects and Methods] Ten young subjects (8 males and 2 females) who underwent ACL reconstruction were included in the study. The subjects were divided into two groups, namely, knee joint extension muscle strength training (MST) group and knee joint extension outside rotation pattern of NJF group. Extension strength was measured in both groups before and after the experiment. Surface electromyography (sEMG) of the vastus medialis and vastus lateralis muscles and joint position error (JPE) test of the knee joint were also conducted. [Results] JPE test results and extension strength measurements in the NJF group were improved compared with those in the MST group. Moreover, the average discharge of the vastus medialis and vastus lateralis muscles on sEMG in the NJF group was significantly increased after MST and NJF treatments. [Conclusion] The obtained results suggest that NJF training in patients with ACL reconstruction can improve knee proprioception ability and muscle strength. PMID:27512270

  18. Custom Anatomical 3D Spacer for Temporomandibular Joint Resection and Reconstruction.

    Green, John Marshall; Lawson, Sarah T; Liacouras, Peter C; Wise, Edward M; Gentile, Michael A; Grant, Gerald Thomas

    2016-03-01

    Two cases are presented using a two-stage approach and a custom antibiotic spacer placement. Temporomandibular reconstruction can be very demanding and accomplished with a variety of methods in preparation of a total joint and ramus reconstruction with total joint prostheses (TMJ Concepts, Ventura, CA). Three-dimensional reconstructions from diagnostic computed tomography were used to establish a virtually planned resection which included the entire condyle-ramus complex. From these data, digital designs were used to manufacture molds to facilitate intraoperative fabrication of precise custom anatomic spacers from rapidly setting antibiotic-impregnated polymethyl methacrylate. Molds were manufactured using vat polymerization (stereolithography) with a photopolymer in the first case and powder bed fusion (electron beam melting) with Ti6AL4V for the second. Surgical methodology and the use of molds for intraoperative spacer fabrication for each case are discussed. PMID:26889353

  19. Total reconstruction of the temporomandibular joint. Up to 8 years of follow-up of patients treated with Biomet(®) total joint prostheses.

    Westermark, A

    2010-10-01

    12 patients underwent temporomandibular joint (TMJ) reconstruction with Biomet total joint prostheses. Indications for TMJ reconstruction included ankylosis, rheumatoid arthritis, degenerative joint disease and condylar resorption. Five patients had unilateral procedures, seven had bilateral. The follow-up ranged between 2 and 8 years. Amongst the ankylotic patients the mean jaw-opening capacity increased from 3.8mm preoperatively to 30.2mm 1 year after surgery, and in most of those patients the opening capacity remained stable over the years. The other patients maintained a mean opening capacity of more than 35 mm. Joint related pain and interference with eating were eliminated after TMJ reconstruction. There were no permanent facial nerve disturbance, no postoperative infections and no device related complications. The outcome supports prosthetic TMJ reconstruction as a useful treatment modality in patients with advanced TMJ disease. PMID:20594807

  20. Application value of curved planar reconstruction in sacroiliac joint of ankylosing spondylitis

    Objective: To determine the application value of curved planar reconstruction (CPR) of multislice spiral computed tomography(MSCT) in changes of sacroiliac joint of ankylosing spondylitis(AS). Methods: 33 patients with AS diagnosed clinically were chosen to take MSCT scanning of bilateral sacroiliac joints with the slice thick of 5mm and the slice interval of 5 mm. The primary images were transported to General Electric AW4.0 workstation, and the multiplanar reformatted sagittal images of sacrum were obtained by the reformat software, and further the coronary images of bilateral sacroiliac joints by CPR with the construction curves coincident with sacrums. Results: All coronary images of bilateral sacroiliac joints by CPR were excellent in density and space resolution, and showed complete sacroiliac joints and their changes clearly and directly. Of all 33 cases, 2 were graded as grade 0, 5 grade I, 11 grade II, 10 grade III, 5 glade IV, according to grading standard. Conclusion: The coronary images of sacroiliac joint by CPR are enough clear and eligible for clinical diagnosis, and, in combination with transversal images, are helpful to complete assessment about the grade and scope of changes of sacroiliac joint in AS patients. (authors)

  1. Kinematic reconstruction of the human arm joints in robot-aided therapies with Hermes robot.

    Bertomeu-Motos, Arturo; Morales, Ricardo; Lledo, Luis D; Diez, Jorge A; Catalan, Jose M; Garcia-Aracil, Nicolas

    2015-08-01

    This paper presents a kinematic reconstruction algorithm for the variables of the human arm joints in robot-aided neurorehabilitation therapies. The presented algorithm uses the end effector of a rehabilitation robot and an accelerometer placed onto the upper arm to compute accurate values of the human arm chain. The goal of this algorithm is to obtain the joint values of the patient's arm to provide objective information to the therapist about the progress of the patient and to study the effectiveness of these kind of therapies. PMID:26736479

  2. Joint reconstruction of absorption and refractive properties in propagation-based x-ray phase-contrast tomography via a non-linear image reconstruction algorithm

    Chen, Yujia; Wang, Kun; Gursoy, Doga; Soriano, Carmen; De Carlo, Francesco; Anastasio, Mark A.

    2016-03-01

    Propagation-based X-ray phase-contrast tomography (XPCT) provides the opportunity to image weakly absorbing objects and is being explored actively for a variety of important pre-clinical applications. Quantitative XPCT image reconstruction methods typically involve a phase retrieval step followed by application of an image reconstruction algorithm. Most approaches to phase retrieval require either acquiring multiple images at different object-to-detector distances or introducing simplifying assumptions, such as a single-material assumption, to linearize the imaging model. In order to overcome these limitations, a non-linear image reconstruction method has been proposed previously that jointly estimates the absorption and refractive properties of an object from XPCT projection data acquired at a single propagation distance, without the need to linearize the imaging model. However, the numerical properties of the associated non-convex optimization problem remain largely unexplored. In this study, computer simulations are conducted to investigate the feasibility of the joint reconstruction problem in practice. We demonstrate that the joint reconstruction problem is ill-posed and sensitive to system inconsistencies. Particularly, the method can generate accurate refractive index images only if the object is thin and has no phase-wrapping in the data. However, we also observed that, for weakly absorbing objects, the refractive index images reconstructed by the joint reconstruction method are, in general, more accurate than those reconstructed using methods that simply ignore the object's absorption.

  3. New design method for lap scarf joint used for reconstruction of timber structures

    Hasníková, Hana; Kunecký, Jiří; Kloiber, Michal; Sebera, V.; Tippner, J.

    New York: Institute of Research Engineers and Doctors, 2015, s. 46-49. ISBN 978-1-63248-083-5. [International Conference on Advances in Civil , Structural and Mechanical Engineering . Bangkok (TH), 28.12.2015-29.12.2015] R&D Projects: GA MK(CZ) DF12P01OVV004 Keywords : lap scarf joint * wooden dowels * stiffness * reconstruction * design rules Subject RIV: AL - Art, Architecture, Cultural Heritage http://www.seekdl.org/conferences_page_papers.php?confid=228

  4. Help Desk Answers: Surgery vs conservative management for AC joint repair: How do the 2 compare?

    Matchin, Bruce; Yee, Bruce; Mott, Timothy

    2016-04-01

    When not considering the grade of acromioclavicular (AC) joint dislocation, both conservative and surgical management lead to positive outcomes, although surgically managed patients require more time out of work. PMID:27262254

  5. Effects of neuromuscular training on knee joint stability after anterior cruciate ligament reconstruction.

    Shim, Jae-Kwang; Choi, Ho-Suk; Shin, Jun-Ho

    2015-12-01

    [Purpose] This study examined the effects of neuromuscular training on knee joint stability after anterior cruciate ligament reconstruction. [Subjects and Methods] The subjects were 16 adults who underwent arthroscopic anterior cruciate reconstruction and neuromuscular training. The Lysholm scale was used to assess functional disorders on the affected knee joint. A KT-2000 arthrometer was used to measure anterior displacement of the tibia against the femur. Surface electromyography was used to detect the muscle activation of the vastus medialis oblique, vastus lateralis, biceps femoris, and semitendinosus before and after neuromuscular training. [Results] There was significant relaxation in tibial anterior displacement of the affected and sound sides in the supine position before neuromuscular training. Furthermore, the difference in the tibial anterior displacement of the affected knee joints in the standing position was reduced after neuromuscular training. Moreover, the variation of the muscle activation evoked higher muscle activation of the vastus medialis oblique, vastus lateralis, biceps femoris, and semitendinosus. [Conclusion] Neuromuscular training may improve functional joint stability in patients with orthopedic musculoskeletal injuries in the postoperative period. PMID:26834316

  6. Relationship Between Functional Knee Joint Position Sense and Functional Performance Scores Following Anterior Cruciate Ligament Reconstruction (Pilot Study)

    Kafa, Nihan; Ataoglu, Muhammed Baybars; Hazar, Zeynep; Citaker, Seyit; Ozer, Mustafa

    2014-01-01

    Objectives: The aim of this study was to assess the relationship between functional knee joint position sense (JPS) and functional performance following ACL reconstruction Methods: Seven male patients (mean age=32,66 ±6,47) who had undergone ACL reconstruction and 10 male healthy control subjects participated in the study. Knee joint position sense was evaluated by reproduction of 20° knee flexion angle in weight-bearing position with single and bilateral limb movement into flexion and extens...

  7. Surgical treatment of acromioclavicular dislocation with coracoclavicular screw and double Endobutton plate%喙锁螺钉与双Endobutton钢板治疗肩锁关节脱位的临床研究

    杨杰; 赵友明; 孙辽军; 洪建军; 孔建中; 杨雷; 窦海成; 邵荣学

    2011-01-01

    Objective To evaluate and compare the clinical outcome of coracoclavicular screw and double Endobutton plate in treatment of acromioclavicular dislocation ( Rockwood Ⅲ-Ⅴ ). Methods Twenty-eight patients with Rockwood Ⅲ-Ⅴ acromioclavicular dislocation were subjected to surgical reconstruction from January 2008 to October 2009. The coracoclavicular screw was performed in 14 patients and the double Endobutton plate in the other 14 patients. Clinical evaluation was performed by using Constant score and subject should value (SSV) in both groups, and the preoperative and postoperative radiographs, curative effects and complications were compared. Results The patients in two groups were followed up for a range of 6-25 months (average 12.6 months) , which showed higher postoperative Constant score and SSV score than preoperation in both groups (P<0.05). But the postoperative Constant sore and postoperative SSV score in the double Endobutton group were (89.8 ±8.3) points and (85.7 ±7. 3) points respectively, significantly better than (78. 0 ± 10. 3) points and (71. 8 ±9. 7) points respectively in the coracoclavicular screw group ( P < 0.05). The radiologic measurement showed no significant difference in regard of the coracoclavicular distance three months after operation in two groups (P>0.05). Conclusions The double Endobutton plate can attain significantly superior clinical outcomes for Rockwood Ⅲ-Ⅴ acromioclavicular dislocation compared with the coracoclavicular screw. The surgical technique of reconstructing the coracoclavicular ligament through anatomical approach will be the future trend in treatment of the acromioclavicular joint dislocation.%目的 探讨喙锁螺钉与双Endobutton钢板治疗Rockwocd Ⅲ~Ⅴ型肩锁关节脱位的临床疗效,并对两者进行对比研究.方法自2008年1月至2009年10月收治Rockwood Ⅲ~Ⅴ型肩锁关节脱位患者28例,电脑随机抽样分为两组,14例采用喙锁螺钉治疗,另14例采用

  8. Reconstruction of high voltage electric burn wound with exposed shoulder joint by thoracoacromial artery perforator propeller flap

    Rout, Debesh Kumar; Nayak, Bibhuti Bhusan; Choudhury, Arun Kumar; Pati, Ajit Kumar

    2014-01-01

    We describe the reconstruction of high voltage electric burn injury with exposed shoulder joint by thoracoacromial artery perforator propeller flap based on the delto-pectoral perforators of thoracoacromial artery. The successful use of this propeller flap to cover the exposed shoulder joint in a case with limited local flap options demonstrates its use as an alternative technique. PMID:25190925

  9. Reconstruction of high voltage electric burn wound with exposed shoulder joint by thoracoacromial artery perforator propeller flap

    Debesh Kumar Rout

    2014-01-01

    Full Text Available We describe the reconstruction of high voltage electric burn injury with exposed shoulder joint by thoracoacromial artery perforator propeller flap based on the delto-pectoral perforators of thoracoacromial artery. The successful use of this propeller flap to cover the exposed shoulder joint in a case with limited local flap options demonstrates its use as an alternative technique.

  10. A joint Richardson—Lucy deconvolution algorithm for the reconstruction of multifocal structured illumination microscopy data

    Ströhl, Florian; Kaminski, Clemens F.

    2015-03-01

    We demonstrate the reconstruction of images obtained by multifocal structured illumination microscopy, MSIM, using a joint Richardson-Lucy, jRL-MSIM, deconvolution algorithm, which is based on an underlying widefield image-formation model. The method is efficient in the suppression of out-of-focus light and greatly improves image contrast and resolution. Furthermore, it is particularly well suited for the processing of noise corrupted data. The principle is verified on simulated as well as experimental data and a comparison of the jRL-MSIM approach with the standard reconstruction procedure, which is based on image scanning microscopy, ISM, is made. Our algorithm is efficient and freely available in a user friendly software package.

  11. Non-operative treatment of a fracture to the coracoid process with acromioclavicular dislocation in an adolescent

    Vera Pedersen

    2014-08-01

    Full Text Available Coracoid process fractures are rare and often associated with dislocations of the acromioclavicular (AC joint. There is little evidence about the treatment of these injuries in adolescents, but the few case reports published recommend surgery. We report a case of a dislocated epiphyseal fracture to the base of the coracoid process with AC joint dislocation in a 14-year-old ice-hockey player following direct impact to his left shoulder. Since magnetic resonance tomography revealed intact AC and coracoclavicular ligaments, we initiated non-operative treatment with immobilization and unloading of the shoulder by an abduction brace allowing limited rotation for 6 weeks. This treatment resulted in complete recovery after 8 weeks and return to full sports on first league level after 3 month. In conclusion, non-operative treatment of coracoid base fractures with concomitant AC-joint injury in the adolescent can result in excellent functional results and early recovery.

  12. Joint Simultaneous Reconstruction of Regularized Building Superstructures from Low-Density LIDAR Data Using Icp

    Wichmann, Andreas; Kada, Martin

    2016-06-01

    There are many applications for 3D city models, e.g., in visualizations, analysis, and simulations; each one requiring a certain level of detail to be effective. The overall trend goes towards including various kinds of anthropogenic and natural objects therein with ever increasing geometric and semantic details. A few years back, the featured 3D building models had only coarse roof geometry. But nowadays, they are expected to include detailed roof superstructures like dormers and chimneys. Several methods have been proposed for the automatic reconstruction of 3D building models from airborne based point clouds. However, they are usually unable to reliably recognize and reconstruct small roof superstructures as these objects are often represented by only few point measurements, especially in low-density point clouds. In this paper, we propose a recognition and reconstruction approach that overcomes this problem by identifying and simultaneously reconstructing regularized superstructures of similar shape. For this purpose, candidate areas for superstructures are detected by taking into account virtual sub-surface points that are assumed to lie on the main roof faces below the measured points. The areas with similar superstructures are detected, extracted, grouped together, and registered to one another with the Iterative Closest Point (ICP) algorithm. As an outcome, the joint point density of each detected group is increased, which helps to recognize the shape of the superstructure more reliably and in more detail. Finally, all instances of each group of superstructures are modeled at once and transformed back to their original position. Because superstructures are reconstructed in groups, symmetries, alignments, and regularities can be enforced in a straight-forward way. The validity of the approach is presented on a number of example buildings from the Vaihingen test data set.

  13. Hip Reconstruction Osteotomy by Ilizarov Method as a Salvage Option for Abnormal Hip Joints

    Masood Umer

    2014-01-01

    Full Text Available Hip joint instability can be secondary to congenital hip pathologies like developmental dysplasia (DDH or acquired such as sequel of infective or neoplastic process. An unstable hip is usually associated with loss of bone from the proximal femur, proximal migration of the femur, lower-extremity length discrepancy, abnormal gait, and pain. In this case series of 37 patients coming to our institution between May 2005 and December 2011, we report our results in treatment of unstable hip joint by hip reconstruction osteotomy using the Ilizarov method and apparatus. This includes an acute valgus and extension osteotomy of the proximal femur combined with gradual varus and distraction (if required for realignment and lengthening at a second, more distal, femoral osteotomy. 18 males and 19 females participated in the study. There were 17 patients with DDH, 12 with sequelae of septic arthritis, 2 with tuberculous arthritis, 4 with posttraumatic arthritis, and 2 with focal proximal femoral deficiency. Outcomes were evaluated by using Harris Hip Scoring system. At the mean follow-up of 37 months, Harris Hip Score had significantly improved in all patients. To conclude, illizarov hip reconstruction can successfully improve Trendelenburg’s gait. It supports the pelvis and simultaneously restores knee alignment and corrects lower-extremity length discrepancy (LLD.

  14. Hip reconstruction osteotomy by Ilizarov method as a salvage option for abnormal hip joints.

    Umer, Masood; Rashid, Haroon; Umer, Hafiz Muhammad; Raza, Hasnain

    2014-01-01

    Hip joint instability can be secondary to congenital hip pathologies like developmental dysplasia (DDH) or acquired such as sequel of infective or neoplastic process. An unstable hip is usually associated with loss of bone from the proximal femur, proximal migration of the femur, lower-extremity length discrepancy, abnormal gait, and pain. In this case series of 37 patients coming to our institution between May 2005 and December 2011, we report our results in treatment of unstable hip joint by hip reconstruction osteotomy using the Ilizarov method and apparatus. This includes an acute valgus and extension osteotomy of the proximal femur combined with gradual varus and distraction (if required) for realignment and lengthening at a second, more distal, femoral osteotomy. 18 males and 19 females participated in the study. There were 17 patients with DDH, 12 with sequelae of septic arthritis, 2 with tuberculous arthritis, 4 with posttraumatic arthritis, and 2 with focal proximal femoral deficiency. Outcomes were evaluated by using Harris Hip Scoring system. At the mean follow-up of 37 months, Harris Hip Score had significantly improved in all patients. To conclude, illizarov hip reconstruction can successfully improve Trendelenburg's gait. It supports the pelvis and simultaneously restores knee alignment and corrects lower-extremity length discrepancy (LLD). PMID:24895616

  15. Joint image reconstruction and motion parameter estimation for free-breathing navigator-gated cardiac MRI

    Akçakaya, Mehmet; Basha, Tamer A.; Weingärtner, Sebastian; Nezafat, Reza

    2013-09-01

    We propose an acquisition and reconstruction technique for accelerated free-breathing cardiac MRI acquisitions. For the acquisition, a random undersampling pattern, including a fully-sampled center of k-space, is generated prospectively. The k-space lines specified by this undersampling pattern is acquired with respiratory navigating (NAV), where only the central k-space lines are acquired within the prespecified gating window. For the outer k-space lines, if the NAV signal corresponding to a k-space segment is outside the gating window, the segment is rejected, but not re-acquired. The reconstruction approach jointly estimates the underlying image using a compressed-sensing based approach, and the translational motion parameters for each segment for the outer k-space segments acquired outside the gating window. The feasibility of the approach is demonstrated in healthy adult subjects using whole-heart coronary MRI with a 3-fold accelerated random undersampling pattern. The proposed acquisition and reconstruction technique is compared to parallel imaging with uniform undersampling with 3-fold undersampling. The two techniques exhibit similar image quality with a shorter acquisition time for the proposed approach (4:25+/-0:31 minutes versus 6:52+/-0:19).

  16. Use of the Composite Pedicled Pectoralis Minor Flap after Resection of Soft Tissue Sarcoma in Reconstruction of the Glenohumeral Joint

    Michiel A. J. van de Sande

    2014-01-01

    Full Text Available The surgical repair of an extensive anterior glenohumeral soft tissue defect is complicated by glenohumeral instability and subsequent significant functional deficit. This surgical note offers a relatively simple reconstruction of the anterior capsule and subscapularis muscle using a pectoralis minor pedicle flap. This reconstruction is supplemented with functional reconstruction of the anterior glenohumeral joint. A conventional deltopectoral approach is utilized and pectoralis minor is freed from its coracoid insertion, released, and mobilized without compromising the pedicle entering from the dorsum and inferior one-third of the muscle. The mobilized pectoralis minor vascular pedicle has sufficient length for the pectoralis minor to be transferred to provide coverage of the anterior shoulder joint even in full external rotation, providing anterior stability. To further improve glenohumeral stability and shoulder function, the pectoralis major muscle can be split with the clavicular part reinserted lateral to the bicipital groove onto the lesser tuberosity replacing subscapularis function while stabilising the glenohumeral joint.

  17. The pedicle screw-rod system is an acceptable method of reconstructive surgery after resection of sacroiliac joint tumours

    Zhou, Yi-Jun; Yunus, Akbar; Tian, Zheng; Chen, Jiang-Tao; Wang, Chong; Xu, Lei-Lei

    2016-01-01

    Hemipelvic resections for primary bone tumours require reconstruction to restore weight bearing along anatomic axes. However, reconstruction of the pelvic arch remains a major surgical challenge because of the high rate of associated complications. We used the pedicle screw-rod system to reconstruct the pelvis, and the purpose of this investigation was to assess the oncology, functional outcome and complication rate following this procedure. The purpose of this study was to investigate the operative indications and technique of the pedicle screw-rod system in reconstruction of the stability of the sacroiliac joint after resection of sacroiliac joint tumours. The average MSTS (Musculoskeletal Tumour Society) score was 26.5 at either three months after surgery or at the latest follow-up. Seven patients had surgery-related complications, including wound dehiscence in one, infection in two, local necrosis in four (including infection in two), sciatic nerve palsy in one and pubic symphysis subluxation in one. There was no screw loosening or deep vein thrombosis occurring in this series. Using a pedicle screw-rod after resection of a sacroiliac joint tumour is an acceptable method of pelvic reconstruction because of its reduced risk of complications and satisfactory functional outcome, as well as its feasibility of reconstruction for type IV pelvis tumour resection without elaborate preoperative customisation. Level of evidence: Level IV, therapeutic study. PMID:27095944

  18. 3D tracking the Brownian motion of colloidal particles using digital holographic microscopy and joint reconstruction

    Verrier, Nicolas; Fournel, Thierry

    2015-01-01

    In-line digital holography is a valuable tool for sizing, locating and tracking micro- or nano-objects in a volume. When a parametric imaging model is available, Inverse Problems approaches provide a straightforward estimate of the object parameters by fitting data with the model, thereby allowing accurate reconstruction. As recently proposed and demonstrated, combining pixel super-resolution techniques with Inverse Problems approaches improves the estimation of particle size and 3D-position. Here we demonstrate the accurate tracking of colloidal particles in Brownian motion. Particle size and 3D-position are jointly optimized from video holograms acquired with a digital holographic microscopy set up based on a "low-end" microscope objective ($\\times 20$, $\\rm NA\\ 0.5$). Exploiting information redundancy makes it possible to characterize particles with a standard deviation of 15 nm in size and a theoretical resolution of 2 x 2 x 5 nm$^3$ for position under additive white Gaussian noise assumption.

  19. Joint space aspect reconstruction of wide-angle SAR exploiting sparsity

    Stojanovic, Ivana; Cetin, Mujdat; Karl, William C.

    2008-04-01

    In this paper we present an algorithm for wide-angle synthetic aperture radar (SAR) image formation. Reconstruction of wide-angle SAR holds a promise of higher resolution and better information about a scene, but it also poses a number of challenges when compared to the traditional narrow-angle SAR. Most prominently, the isotropic point scattering model is no longer valid. We present an algorithm capable of producing high resolution reflectivity maps in both space and aspect, thus accounting for the anisotropic scattering behavior of targets. We pose the problem as a non-parametric three-dimensional inversion problem, with two constraints: magnitudes of the backscattered power are highly correlated across closely spaced look angles and the backscattered power originates from a small set of point scatterers. This approach considers jointly all scatterers in the scene across all azimuths, and exploits the sparsity of the underlying scattering field. We implement the algorithm and present reconstruction results on realistic data obtained from the XPatch Backhoe dataset.

  20. Simulated and reconstructed climate in Europe during the last five centuries: joint evaluation of climate models performance and the dynamical consistency of gridded reconstructions

    José Gómez-Navarro, Juan; Bothe, Oliver; Wagner, Sebastian; Zorita, Eduardo; Werner, Johannes P.; Luterbacher, Jürg; Raible, Christoph C.; Montávez, Juan Pedro

    2015-04-01

    This study jointly analyses European winter and summer temperature and precipitation gridded climate reconstructions and a regional climate simulation reaching a resolution of 45 km over the period 1501-1990. In a first step, the simulation is compared to observational records to establish the model performance and to identify the most prominent caveats. It is found that the regional simulation is able to add value to the driving global simulation, which allows it to reproduce accurately the most prominent characteristics of the European climate, although remarkable biases can also be identified. In a second step, the simulation is compared to a set on independent reconstructions. The high-resolution of the simulation and the reconstructions allows to analyse the European area for nine sub-areas. An overall good agreement is found between the reconstructed and simulated climate variability across different areas, supporting a consistency of both products and the proper calibration of the reconstructions. However, biases appear between both datasets, that thanks to the evaluation of the model performance carried out before, can be attributed to deficiencies in the simulation. Although the simulation responds to external forcing, it largely differers with reconstructions in their estimates of the past climate evolution for European sub-regions. In particular, there are deviations between simulated and reconstructed anomalies during the Maunder and Dalton minima, i.e. the simulated response is much stronger than the reconstructed. This disagreement is to some extent expected given the prominent role of internal variability in the regional evolution of temperature and precipitation. However the inability of the model to reproduce any warm period similar to that recorded around 1740 in the reconstructions indicates fundamental limitations in the simulation that preclude reproducing exceptionally anomalous conditions. Despite these limitations, the simulated climate is a

  1. An edge-preserving algorithm of joint image restoration and volume reconstruction for rotation-scanning 4D echocardiographic images

    GUO Qiang; YANG Xin

    2006-01-01

    A statistical algorithm for the reconstruction from time sequence echocardiographic images is proposed in this paper.The ability to jointly restore the images and reconstruct the 3D images without blurring the boundary is the main innovation of this algorithm. First, a Bayesian model based on MAP-MRF is used to reconstruct 3D volume, and extended to deal with the images acquired by rotation scanning method. Then, the spatiotemporal nature of ultrasound images is taken into account for the parameter of energy function, which makes this statistical model anisotropic. Hence not only can this method reconstruct 3D ultrasound images, but also remove the speckle noise anisotropically. Finally, we illustrate the experiments of our method on the synthetic and medical images and compare it with the isotropic reconstruction method.

  2. Long-term bone tissue reaction to polyethylene oxide/polybutylene terephthalate copolymer (Polyactive) in metacarpophalangeal joint reconstruction.

    Waris, Eero; Ashammakhi, Nureddin; Lehtimäki, Mauri; Tulamo, Riitta-Mari; Törmälä, Pertti; Kellomäki, Minna; Konttinen, Yrjö T

    2008-06-01

    The poly-L/D-lactide 96/4 joint scaffolds are used to engineer fibrous tissue joints in situ for the reconstruction of metacarpophalangeal joints. In this experimental study, a supplementary elastomeric stem made of Polyactive 1000PEO70PBT30 (a segmented block copolymer of polyethylene oxide and polybutylene terephtalate with 70/30 PEO/PBT ratio) was used to anchor the joint scaffold in the arthroplasty space. Eleven resected fifth metacarpophalangeal joints of minipig were reconstructed and evaluated radiologically and histologically for 3 years. Plain joint scaffold and Swanson silicone implant arthroplasties (11 of each) in metacarpophalangeal joints of minipig served as controls. Altogether fore limbs of eighteen minipigs were operated for the study. Deleterious tissue reaction with dramatic signs of osteolysis and inflammatory foreign-body reaction was observed around the Polyactive stems. The mean maximum diameter of the osteolytic stem cavity was statistically wider when compared to the mean maximum diameter of Swanson implant group during the first postoperative year. Numerous osteoclasts were found at the margins of the osteolytic areas. No direct bone contact could be seen. At 1 year osteoblastic regeneration and formation of new trabecular bone followed. Finally the foreign-body reaction settled, but the adjoining bones were at this stage highly sclerotic and composed of coarse trabeculae. In contrary to previous in vivo studies suggesting biocompatibility, osteoconductivity and capability to bond to bone, Polyactive 1000PEO70PBT30 stem in this setting caused massive osteolytic lesions and foreign-body reactions. PMID:18336902

  3. Anatomy assisted PET image reconstruction incorporating multi-resolution joint entropy

    A promising approach in PET image reconstruction is to incorporate high resolution anatomical information (measured from MR or CT) taking the anato-functional similarity measures such as mutual information or joint entropy (JE) as the prior. These similarity measures only classify voxels based on intensity values, while neglecting structural spatial information. In this work, we developed an anatomy-assisted maximum a posteriori (MAP) reconstruction algorithm wherein the JE measure is supplied by spatial information generated using wavelet multi-resolution analysis. The proposed wavelet-based JE (WJE) MAP algorithm involves calculation of derivatives of the subband JE measures with respect to individual PET image voxel intensities, which we have shown can be computed very similarly to how the inverse wavelet transform is implemented. We performed a simulation study with the BrainWeb phantom creating PET data corresponding to different noise levels. Realistically simulated T1-weighted MR images provided by BrainWeb modeling were applied in the anatomy-assisted reconstruction with the WJE-MAP algorithm and the intensity-only JE-MAP algorithm. Quantitative analysis showed that the WJE-MAP algorithm performed similarly to the JE-MAP algorithm at low noise level in the gray matter (GM) and white matter (WM) regions in terms of noise versus bias tradeoff. When noise increased to medium level in the simulated data, the WJE-MAP algorithm started to surpass the JE-MAP algorithm in the GM region, which is less uniform with smaller isolated structures compared to the WM region. In the high noise level simulation, the WJE-MAP algorithm presented clear improvement over the JE-MAP algorithm in both the GM and WM regions. In addition to the simulation study, we applied the reconstruction algorithms to real patient studies involving DPA-173 PET data and Florbetapir PET data with corresponding T1-MPRAGE MRI images. Compared to the intensity-only JE-MAP algorithm, the WJE

  4. Joint Reconstruction of Absorbed Optical Energy Density and Sound Speed Distribution in Photoacoustic Computed Tomography: A numerical Investigation

    Huang, Chao; Schoonover, Robert W; Wang, Lihong V; Anastasio, Mark A

    2015-01-01

    Photoacoustic computed tomography (PACT) is a rapidly emerging bioimaging modality that seeks to reconstruct an estimate of the absorbed optical energy density within an object. Conventional PACT image reconstruction methods assume a constant speed-of-sound (SOS), which can result in image artifacts when acoustic aberrations are significant. It has been demonstrated that incorporating knowledge of an object's SOS distribution into a PACT image reconstruction method can improve image quality. However, in many cases, the SOS distribution cannot be accurately and/or conveniently estimated prior to the PACT experiment. Because variations in the SOS distribution induce aberrations in the measured photoacoustic wavefields, certain information regarding an object's SOS distribution is encoded in the PACT measurement data. Based on this observation, a joint reconstruction (JR) problem has been proposed in which the SOS distribution is concurrently estimated along with the sought-after absorbed optical energy density ...

  5. Relationship Between Functional Knee Joint Position Sense and Functional Performance Scores Following Anterior Cruciate Ligament Reconstruction (Pilot Study)

    Kafa, Nihan; Ataoglu, Muhammed Baybars; Hazar, Zeynep; Citaker, Seyit; Ozer, Mustafa

    2014-01-01

    Objectives: The aim of this study was to assess the relationship between functional knee joint position sense (JPS) and functional performance following ACL reconstruction Methods: Seven male patients (mean age=32,66 ±6,47) who had undergone ACL reconstruction and 10 male healthy control subjects participated in the study. Knee joint position sense was evaluated by reproduction of 20° knee flexion angle in weight-bearing position with single and bilateral limb movement into flexion and extension. The deviations in the angle were recorded and compared to both noninjured side and healthy controls’. Functional performance was evaluated with Single Leg Hop Test in both injured and non-injured sides. The scores were also compared with healthy controls and non-injured sides. Relationship between measured values was tested with Spearman Correlation Analysis. Results: There was no significant difference in knee joint position sense in functional position between the operated and uninjured knees of patients or between patients and healthy controls (p>0,05). However, there is significant difference in Single Leg Hop test scores between operated and non-operated or between patients and healthy controls (p=0,037; p0,05). Conclusion: There was no evidence of impaired joint position sense in weight-bearing positions in subjects with ACL reconstruction but there was a decrease in functional performance. This decrease in functional performance may depend on the other parameters except proprioceptive deficits.

  6. Partial arthroscopic trapeziectomy with ligament reconstruction to treat primary thumb basal joint osteoarthritis.

    Desmoineaux, P; Delaroche, C; Beaufils, P

    2012-11-01

    Since the outcome of partial trapeziectomy is not always satisfactory, we proposed using arthroscopy to perform partial trapeziectomy and to perform ligament reconstruction with the abductor pollicis longus tendon. A tendon strip was left intact at its insertion at the base of the first metacarpal and then slipped into the trapeziectomy space. It was fixed into a blind tunnel at the base of the second metacarpal with a bioabsorbable interference screw. Forty-nine patients were surgically treated between 2006 and 2009. With an average follow-up of 3.6 years, 83.5% of patients were satisfied with the procedure; 96% of thumbs were stable and 74% were pain free. The average recovery time was 4.5 months. There were four cases of radial nerve branch irritation and one case of flexor carpi radialis tendinitis; there were no cases of complex regional pain syndrome. This minimally-invasive technique is a less-aggressive treatment approach for thumb carpometacarpal joint arthritis, which simplify postoperative recovery. PMID:23098774

  7. dPIRPLE: a joint estimation framework for deformable registration and penalized-likelihood CT image reconstruction using prior images

    Sequential imaging studies are conducted in many clinical scenarios. Prior images from previous studies contain a great deal of patient-specific anatomical information and can be used in conjunction with subsequent imaging acquisitions to maintain image quality while enabling radiation dose reduction (e.g., through sparse angular sampling, reduction in fluence, etc). However, patient motion between images in such sequences results in misregistration between the prior image and current anatomy. Existing prior-image-based approaches often include only a simple rigid registration step that can be insufficient for capturing complex anatomical motion, introducing detrimental effects in subsequent image reconstruction. In this work, we propose a joint framework that estimates the 3D deformation between an unregistered prior image and the current anatomy (based on a subsequent data acquisition) and reconstructs the current anatomical image using a model-based reconstruction approach that includes regularization based on the deformed prior image. This framework is referred to as deformable prior image registration, penalized-likelihood estimation (dPIRPLE). Central to this framework is the inclusion of a 3D B-spline-based free-form-deformation model into the joint registration-reconstruction objective function. The proposed framework is solved using a maximization strategy whereby alternating updates to the registration parameters and image estimates are applied allowing for improvements in both the registration and reconstruction throughout the optimization process. Cadaver experiments were conducted on a cone-beam CT testbench emulating a lung nodule surveillance scenario. Superior reconstruction accuracy and image quality were demonstrated using the dPIRPLE algorithm as compared to more traditional reconstruction methods including filtered backprojection, penalized-likelihood estimation (PLE), prior image penalized-likelihood estimation (PIPLE) without registration, and

  8. ACL reconstruction and the implication of its tibial attachment for stability of the joint: anthropometric and biomechanical study

    Papachristou, George; Sourlas, John; Magnissalis, Evangelos; Plessas, Spyros; Papachristou, Konstantinos

    2006-01-01

    The planar topography of the anterior cruciate ligament (ACL) insertion was investigated and correlated to the use of the double-bundle/double tibial tunnel ACL reconstruction technique within the ACL tibial insertion area. The anteroposterior and mediolateral length of the tibial ACL attachment and the distances of the tibial insertion area from the anterior and posterior tibial borders were measured and the stability of the joint was tested using the double-bundle/double tibial tunnel ACL r...

  9. Phillips-Tikhonov regularization with a priori information for neutron emission tomographic reconstruction on Joint European Torus

    Bielecki, J.; Giacomelli, L.; Kiptily, V.; Scholz, M.; Drozdowicz, K.; Conroy, S.; Craciunescu, T.; Kempenaars, M.

    2015-09-01

    A method of tomographic reconstruction of the neutron emissivity in the poloidal cross section of the Joint European Torus (JET, Culham, UK) tokamak was developed. Due to very limited data set (two projection angles, 19 lines of sight only) provided by the neutron emission profile monitor (KN3 neutron camera), the reconstruction is an ill-posed inverse problem. The aim of this work consists in making a contribution to the development of reliable plasma tomography reconstruction methods that could be routinely used at JET tokamak. The proposed method is based on Phillips-Tikhonov regularization and incorporates a priori knowledge of the shape of normalized neutron emissivity profile. For the purpose of the optimal selection of the regularization parameters, the shape of normalized neutron emissivity profile is approximated by the shape of normalized electron density profile measured by LIDAR or high resolution Thomson scattering JET diagnostics. In contrast with some previously developed methods of ill-posed plasma tomography reconstruction problem, the developed algorithms do not include any post-processing of the obtained solution and the physical constrains on the solution are imposed during the regularization process. The accuracy of the method is at first evaluated by several tests with synthetic data based on various plasma neutron emissivity models (phantoms). Then, the method is applied to the neutron emissivity reconstruction for JET D plasma discharge #85100. It is demonstrated that this method shows good performance and reliability and it can be routinely used for plasma neutron emissivity reconstruction on JET.

  10. Phillips-Tikhonov regularization with a priori information for neutron emission tomographic reconstruction on Joint European Torus

    Bielecki, J.; Scholz, M.; Drozdowicz, K. [Institute of Nuclear Physics, Polish Academy of Sciences, PL-31342 Krakow (Poland); Giacomelli, L. [CCFE, Culham Science Centre, Abingdon OX14 3DB (United Kingdom); Istituto di Fisica del Plasma “P. Caldirola,” Milano (Italy); Kiptily, V.; Kempenaars, M. [CCFE, Culham Science Centre, Abingdon OX14 3DB (United Kingdom); Conroy, S. [CCFE, Culham Science Centre, Abingdon OX14 3DB (United Kingdom); Department of Physics and Astronomy, Uppsala University (Sweden); Craciunescu, T. [IAP, National Institute for Laser Plasma and Radiation Physics, Bucharest (Romania); Collaboration: EUROfusion Consortium, JET, Culham Science Centre, Abingdon OX14 3DB (United Kingdom)

    2015-09-15

    A method of tomographic reconstruction of the neutron emissivity in the poloidal cross section of the Joint European Torus (JET, Culham, UK) tokamak was developed. Due to very limited data set (two projection angles, 19 lines of sight only) provided by the neutron emission profile monitor (KN3 neutron camera), the reconstruction is an ill-posed inverse problem. The aim of this work consists in making a contribution to the development of reliable plasma tomography reconstruction methods that could be routinely used at JET tokamak. The proposed method is based on Phillips-Tikhonov regularization and incorporates a priori knowledge of the shape of normalized neutron emissivity profile. For the purpose of the optimal selection of the regularization parameters, the shape of normalized neutron emissivity profile is approximated by the shape of normalized electron density profile measured by LIDAR or high resolution Thomson scattering JET diagnostics. In contrast with some previously developed methods of ill-posed plasma tomography reconstruction problem, the developed algorithms do not include any post-processing of the obtained solution and the physical constrains on the solution are imposed during the regularization process. The accuracy of the method is at first evaluated by several tests with synthetic data based on various plasma neutron emissivity models (phantoms). Then, the method is applied to the neutron emissivity reconstruction for JET D plasma discharge #85100. It is demonstrated that this method shows good performance and reliability and it can be routinely used for plasma neutron emissivity reconstruction on JET.

  11. Phillips-Tikhonov regularization with a priori information for neutron emission tomographic reconstruction on Joint European Torus

    A method of tomographic reconstruction of the neutron emissivity in the poloidal cross section of the Joint European Torus (JET, Culham, UK) tokamak was developed. Due to very limited data set (two projection angles, 19 lines of sight only) provided by the neutron emission profile monitor (KN3 neutron camera), the reconstruction is an ill-posed inverse problem. The aim of this work consists in making a contribution to the development of reliable plasma tomography reconstruction methods that could be routinely used at JET tokamak. The proposed method is based on Phillips-Tikhonov regularization and incorporates a priori knowledge of the shape of normalized neutron emissivity profile. For the purpose of the optimal selection of the regularization parameters, the shape of normalized neutron emissivity profile is approximated by the shape of normalized electron density profile measured by LIDAR or high resolution Thomson scattering JET diagnostics. In contrast with some previously developed methods of ill-posed plasma tomography reconstruction problem, the developed algorithms do not include any post-processing of the obtained solution and the physical constrains on the solution are imposed during the regularization process. The accuracy of the method is at first evaluated by several tests with synthetic data based on various plasma neutron emissivity models (phantoms). Then, the method is applied to the neutron emissivity reconstruction for JET D plasma discharge #85100. It is demonstrated that this method shows good performance and reliability and it can be routinely used for plasma neutron emissivity reconstruction on JET

  12. Phillips-Tikhonov regularization with a priori information for neutron emission tomographic reconstruction on Joint European Torus.

    Bielecki, J; Giacomelli, L; Kiptily, V; Scholz, M; Drozdowicz, K; Conroy, S; Craciunescu, T; Kempenaars, M

    2015-09-01

    A method of tomographic reconstruction of the neutron emissivity in the poloidal cross section of the Joint European Torus (JET, Culham, UK) tokamak was developed. Due to very limited data set (two projection angles, 19 lines of sight only) provided by the neutron emission profile monitor (KN3 neutron camera), the reconstruction is an ill-posed inverse problem. The aim of this work consists in making a contribution to the development of reliable plasma tomography reconstruction methods that could be routinely used at JET tokamak. The proposed method is based on Phillips-Tikhonov regularization and incorporates a priori knowledge of the shape of normalized neutron emissivity profile. For the purpose of the optimal selection of the regularization parameters, the shape of normalized neutron emissivity profile is approximated by the shape of normalized electron density profile measured by LIDAR or high resolution Thomson scattering JET diagnostics. In contrast with some previously developed methods of ill-posed plasma tomography reconstruction problem, the developed algorithms do not include any post-processing of the obtained solution and the physical constrains on the solution are imposed during the regularization process. The accuracy of the method is at first evaluated by several tests with synthetic data based on various plasma neutron emissivity models (phantoms). Then, the method is applied to the neutron emissivity reconstruction for JET D plasma discharge #85100. It is demonstrated that this method shows good performance and reliability and it can be routinely used for plasma neutron emissivity reconstruction on JET. PMID:26429441

  13. The effect of CT dose on glenohumeral joint congruency measurements using 3D reconstructed patient-specific bone models

    The study of joint congruency at the glenohumeral joint of the shoulder using computed tomography (CT) and three-dimensional (3D) reconstructions of joint surfaces is an area of significant clinical interest. However, ionizing radiation delivered to patients during CT examinations is much higher than other types of radiological imaging. The shoulder represents a significant challenge for this modality as it is adjacent to the thyroid gland and breast tissue. The objective of this study was to determine the optimal CT scanning techniques that would minimize radiation dose while accurately quantifying joint congruency of the shoulder. The results suggest that only one-tenth of the standard applied total current (mA) and a pitch ratio of 1.375:1 was necessary to produce joint congruency values consistent with that of the higher dose scans. Using the CT scanning techniques examined in this study, the effective dose applied to the shoulder to quantify joint congruency was reduced by 88.9% compared to standard clinical CT imaging techniques.

  14. A joint Richardson—Lucy deconvolution algorithm for the reconstruction of multifocal structured illumination microscopy data

    We demonstrate the reconstruction of images obtained by multifocal structured illumination microscopy, MSIM, using a joint Richardson–Lucy, jRL-MSIM, deconvolution algorithm, which is based on an underlying widefield image-formation model. The method is efficient in the suppression of out-of-focus light and greatly improves image contrast and resolution. Furthermore, it is particularly well suited for the processing of noise corrupted data. The principle is verified on simulated as well as experimental data and a comparison of the jRL-MSIM approach with the standard reconstruction procedure, which is based on image scanning microscopy, ISM, is made. Our algorithm is efficient and freely available in a user friendly software package. (paper)

  15. Maximum-likelihood joint image reconstruction and motion estimation with misaligned attenuation in TOF-PET/CT

    Bousse, Alexandre; Bertolli, Ottavia; Atkinson, David; Arridge, Simon; Ourselin, Sébastien; Hutton, Brian F.; Thielemans, Kris

    2016-02-01

    This work is an extension of our recent work on joint activity reconstruction/motion estimation (JRM) from positron emission tomography (PET) data. We performed JRM by maximization of the penalized log-likelihood in which the probabilistic model assumes that the same motion field affects both the activity distribution and the attenuation map. Our previous results showed that JRM can successfully reconstruct the activity distribution when the attenuation map is misaligned with the PET data, but converges slowly due to the significant cross-talk in the likelihood. In this paper, we utilize time-of-flight PET for JRM and demonstrate that the convergence speed is significantly improved compared to JRM with conventional PET data.

  16. Joint Cross-Range Scaling and 3D Geometry Reconstruction of ISAR Targets Based on Factorization Method.

    Lei Liu; Feng Zhou; Xue-Ru Bai; Ming-Liang Tao; Zi-Jing Zhang

    2016-04-01

    Traditionally, the factorization method is applied to reconstruct the 3D geometry of a target from its sequential inverse synthetic aperture radar images. However, this method requires performing cross-range scaling to all the sub-images and thus has a large computational burden. To tackle this problem, this paper proposes a novel method for joint cross-range scaling and 3D geometry reconstruction of steadily moving targets. In this method, we model the equivalent rotational angular velocity (RAV) by a linear polynomial with time, and set its coefficients randomly to perform sub-image cross-range scaling. Then, we generate the initial trajectory matrix of the scattering centers, and solve the 3D geometry and projection vectors by the factorization method with relaxed constraints. After that, the coefficients of the polynomial are estimated from the projection vectors to obtain the RAV. Finally, the trajectory matrix is re-scaled using the estimated rotational angle, and accurate 3D geometry is reconstructed. The two major steps, i.e., the cross-range scaling and the factorization, are performed repeatedly to achieve precise 3D geometry reconstruction. Simulation results have proved the effectiveness and robustness of the proposed method. PMID:26886991

  17. Spatial Change of Cruciate Ligaments in Rat Embryo Knee Joint by Three-Dimensional Reconstruction

    Xiangkai Zhang; Tomoki Aoyama; Ryota Takaishi; Shinya Higuchi; Shigehito Yamada; Hiroshi Kuroki; Tetsuya Takakuwa

    2015-01-01

    This study aimed to analyze the spatial developmental changes of rat cruciate ligaments by three-dimensional (3D) reconstruction using episcopic fluorescence image capture (EFIC). Cruciate ligaments of Wister rat embryos between embryonic day (E) 16 and E20 were analyzed. Samples were sectioned and visualized using EFIC. 3D reconstructions were generated using Amira software. The length of the cruciate ligaments, distances between attachment points to femur and tibia, angles of the cruciate l...

  18. Fast Monte Carlo based joint iterative reconstruction for simultaneous 99mTc/ 123I SPECT imaging.

    Ouyang, Jinsong; El Fakhri, Georges; Moore, Stephen C

    2007-08-01

    Simultaneous 99mTC/ 123I SPECT allows the assessment of two physiological functions under identical conditions. The separation of these radionuclides is difficult, however, because their energies are close. Most energy-window-based scatter correction methods do not fully model either physical factors or patient-specific activity and attenuation distributions. We have developed a fast Monte Carlo (MC) simulation-based multiple-radionuclide and multiple-energy joint ordered-subset expectation-maximization (JOSEM) iterative reconstruction algorithm, MC-JOSEM. MC-JOSEM simultaneously corrects for scatter and cross talk as well as detector response within the reconstruction algorithm. We evaluated MC-JOSEM for simultaneous brain profusion (99mTc-HMPAO) and neurotransmission (123I-altropane) SPECT. MC simulations of 99mTc and 123I studies were generated separately and then combined to mimic simultaneous 99mTc/ 123I SPECT. All the details of photon transport through the brain, the collimator, and detector, including Compton and coherent scatter, septal penetration, and backscatter from components behind the crystal, were modeled. We reconstructed images from simultaneous dual-radionuclide projections in three ways. First, we reconstructed the photopeak-energy-window projections (with an asymmetric energy window for 1231) using the standard ordered-subsets expectation-maximization algorithm (NSC-OSEM). Second, we used standard OSEM to reconstruct 99mTc photopeak-energy-window projections, while including an estimate of scatter from a Compton-scatter energy window (SC-OSEM). Third, we jointly reconstructed both 99mTc and 123I images using projection data associated with two photo-peak energy windows and an intermediate-energy window using MC-JOSEM. For 15 iterations of reconstruction, the bias and standard deviation of 99mTc activity estimates in several brain structures were calculated for NSC-OSEM, SC-OSEM, and MC-JOSEM, using images reconstructed from primary

  19. Acromioclavicular dislocation: postoperative evaluation of the coracoclavicular ligaments using magnetic resonance☆

    Faria, Rafael Salomon Silva; Ribeiro, Fabiano Rebouças; Amin, Bruno de Oliveira; Tenor Junior, Antonio Carlos; da Costa, Miguel Pereira; Filardi Filho, Cantídio Salvador; Batista, Cleber Gonçalves; Brasil Filho, Rômulo

    2015-01-01

    Objective To radiologically evaluate the healing of the coracoclavicular ligaments after surgical treatment for acromioclavicular dislocation. Methods Ten patients who had undergone surgical treatment for acromioclavicular dislocation via a posterosuperior route at least one year earlier were invited to return for radiological assessment using magnetic resonance. This evaluation was done by means of analogy with the scale described in the literature for studying the healing of the anterior cruciate ligament of the knee and for measuring the healed coracoclavicular ligaments. Results A scar structure of fibrous appearance had formed in 100% of the cases. In 50% of the cases, the images of this structure had a good appearance, while the other 50% were deficient. Conclusion Late postoperative evaluation using magnetic resonance, on patients who had been treated for acute acromioclavicular dislocation using a posterosuperior route in the shoulder, showed that the coracoclavicular ligaments had healed in 100% of the cases, but that this healing was deficient in 50%. PMID:26229916

  20. Joint Reconstruction of Multi-channel, Spectral CT Data via Constrained Total Nuclear Variation Minimization

    Rigie, David

    2014-01-01

    We explore the use of the recently proposed "total nuclear variation" (TNV) \\cite{Rigie2014,Holt2014} as a regularizer for reconstructing multi-channel, spectral CT images. This convex penalty is a natural extension of the total variation (TV) to vector-valued images and has the advantage of encouraging common edge locations and a shared gradient direction among image channels. We show how it can be incorporated into a general, data-constrained reconstruction framework and derive update equations based on the first-order, primal-dual algorithm of Chambolle and Pock. Early simulation studies based on the numerical XCAT phantom indicate that the inter-channel coupling introduced by the TNV leads to better preservation of image features at high levels of regularization, compared to independent, channel-by-channel TV reconstructions.

  1. Systematics of glenohumoral and acromioclavicular arthritis; Systematik der glenohumeralen und akromioklavikulaeren Arthrose

    Seifarth, A. [Klinikum Augsburg, Klinik fuer Diagnostische und Interventionelle Radiologie und Neuroradiologie, Augsburg (Germany); Roemer, F. [Klinikum Augsburg, Klinik fuer Diagnostische und Interventionelle Radiologie und Neuroradiologie, Augsburg (Germany); Universitaetsklinikum Erlangen, Radiologisches Institut, Erlangen (Germany)

    2015-03-01

    A common risk factor for osteoarthritis (OA) of the glenohumeral joint is instability and is often observed as a sequel to dislocation. Altered biomechanics will ultimately result in joint degeneration including osteophyte development at the lower margin of the humerus, glenoidal cartilage loss and surface deformity. An OA of the glenohumeral joint is often coexistent with soft tissue derangement of the shoulder. In advanced stages defects of the rotator cuff and OA of the glenohumeral joint may accelerate disease progression. Degenerative changes of the acromioclavicular joint (AC joint) are commonly seen in older persons with only modest correlation with clinical symptoms. Symptomatic OA of the AC joint is often concomitantly observed with degenerative changes of the glenohumeral joint. Standard radiographs are the basis of a structural assessment of shoulder OA but lack correlation with clinical symptoms and are insensitive for the detection of early degenerative changes. Magnetic resonance imaging (MRI) provides increased sensitivity for the detection of cartilage defects and reveals relevant soft tissue changes, such as lesions of the glenoid labrum and capsuloligamentous structures, which are seen in conjunction with instability. It is also the method of choice to detect clinically relevant bone marrow edema-like lesions or synovial changes that are associated with symptomatic OA. Standard radiographs are not applicable for detection of early degenerative changes. Once OA is suspected clinically, MRI is the method of choice for further structural assessment. The administration of an intravenous contrast agent is useful for assessing synovitis, which commonly correlates with clinical disease manifestations. For preoperative and surgical planning of joint replacement, MRI or CT should be used. (orig.) [German] Eine haeufige Ursache der Omarthrose ist die Mikro- und Makroinstabilitaet, oft infolge von Luxationen. Bei veraenderter Biomechanik kommt es im Verlauf

  2. Temporomandibular Joint Prosthesis - 3D-CT Reconstruction before and after Treatment

    Feltlová, E.; Dostálová, T.; Kašparová, M.; Daněk, J.; Hliňáková, P.; Hubáček, M.; Nedoma, Jiří

    2010-01-01

    Roč. 6, č. 1 (2010), s. 15-19. ISSN 1801-5603 Institutional research plan: CEZ:AV0Z10300504 Keywords : dentistry * maxillofacial surgery * partial TMJ prosthesis * three-dimensional computed tomography * magnetic resonance imaging * temporomandibular joint Subject RIV: BA - General Mathematics http://www.ejbi.cz/articles/201012/50/1.html

  3. Finite-element analysis of a historical truss reconstructed with a traditional all-wooden joints

    Tippner, J.; Milch, J.; Sebera, V.; Kunecký, Jiří; Kloiber, Michal; Navrátil, M.

    Mexico City: Instituto de Ingeniería UNAM, 2014 - (Peña, F.; Chávez, M.) ISBN N R&D Projects: GA MK(CZ) DF12P01OVV004 Keywords : wooden joint * sub-structural finite-element analysis * historical truss Subject RIV: AL - Art, Architecture, Cultural Heritage

  4. Acromioclavicular Dislocation Associated with Coracoid Process Fracture: Report of Two Cases and Review of the Literature

    Ozkan Kose

    2015-01-01

    Full Text Available Acromioclavicular dislocation associated with coracoid process fracture is a rare injury. Herein we reported two further cases with such combination of injuries and reviewed all previously published cases in current literature. In this review, we discussed the demographic characteristics, mechanism of injury, diagnosis, and treatment options extensively.

  5. Acromioclavicular Dislocation Associated with Coracoid Process Fracture: Report of Two Cases and Review of the Literature

    Kose, Ozkan; Canbora, Kerem; Guler, Ferhat; Kilicaslan, Omer Faruk; May, Hasan

    2015-01-01

    Acromioclavicular dislocation associated with coracoid process fracture is a rare injury. Herein we reported two further cases with such combination of injuries and reviewed all previously published cases in current literature. In this review, we discussed the demographic characteristics, mechanism of injury, diagnosis, and treatment options extensively. PMID:26491588

  6. Acromioclavicular Dislocation Associated with Coracoid Process Fracture: Report of Two Cases and Review of the Literature

    Ozkan Kose; Kerem Canbora; Ferhat Guler; Omer Faruk Kilicaslan; Hasan May

    2015-01-01

    Acromioclavicular dislocation associated with coracoid process fracture is a rare injury. Herein we reported two further cases with such combination of injuries and reviewed all previously published cases in current literature. In this review, we discussed the demographic characteristics, mechanism of injury, diagnosis, and treatment options extensively.

  7. Influence of plasma diagnostics and constraints on the quality of equilibrium reconstructions on Joint European Torus.

    Gelfusa, M; Murari, A; Lupelli, I; Hawkes, N; Gaudio, P; Baruzzo, M; Brix, M; Craciunescu, T; Drozdov, V; Meigs, A; Peluso, E; Romanelli, M; Schmuck, S; Sieglin, B

    2013-10-01

    One of the main approaches to thermonuclear fusion relies on confining high temperature plasmas with properly shaped magnetic fields. The determination of the magnetic topology is, therefore, essential for controlling the experiments and for achieving the required performance. In Tokamaks, the reconstruction of the fields is typically formulated as a free boundary equilibrium problem, described by the Grad-Shafranov equation in toroidal geometry and axisymmetric configurations. Unfortunately, this results in mathematically very ill posed problems and, therefore, the quality of the equilibrium reconstructions depends sensitively on the measurements used as inputs and on the imposed constraints. In this paper, it is shown how the different diagnostics (Magnetics Measurements, Polarimetry and Motional Stark Effect), together with the edge current density and plasma pressure constraints, can have a significant impact on the quality of the equilibrium on JET. Results show that both the Polarimetry and Motional Stark Effect internal diagnostics are crucial in order to obtain reasonable safety factor profiles. The impact of the edge current density constraint is significant when the plasma is in the H-mode of confinement. In this plasma scenario the strike point positions and the plasma last closed flux surface can change even by centimetres, depending on the edge constraints, with a significant impact on the remapping of the equilibrium-dependent diagnostics and of pedestal physics studies. On the other hand and quite counter intuitively, the pressure constraint can severely affect the quality of the magnetic reconstructions in the core. These trends have been verified with several JET discharges and consistent results have been found. An interpretation of these results, as interplay between degrees of freedom and available measurements, is provided. The systematic analysis described in the paper emphasizes the importance of having sufficient diagnostic inputs and of

  8. Joint space aspect reconstruction of wide-angle SAR exploiting sparsity

    Stojanovic, Ivana; Çetin, Müjdat; Cetin, Mujdat; Karl, W. Clem

    2008-01-01

    In this paper we present an algorithm for wide-angle synthetic aperture radar (SAR) image formation. Reconstruction of wide-angle SAR holds a promise of higher resolution and better information about a scene, but it also poses a number of challenges when compared to the traditional narrow-angle SAR. Most prominently, the isotropic point scattering model is no longer valid. We present an algorithm capable of producing high resolution reflectivity maps in both space and aspect, thus accounting f...

  9. Spatial Change of Cruciate Ligaments in Rat Embryo Knee Joint by Three-Dimensional Reconstruction.

    Xiangkai Zhang

    Full Text Available This study aimed to analyze the spatial developmental changes of rat cruciate ligaments by three-dimensional (3D reconstruction using episcopic fluorescence image capture (EFIC. Cruciate ligaments of Wister rat embryos between embryonic day (E 16 and E20 were analyzed. Samples were sectioned and visualized using EFIC. 3D reconstructions were generated using Amira software. The length of the cruciate ligaments, distances between attachment points to femur and tibia, angles of the cruciate ligaments and the cross angle of the cruciate ligaments were measured. The shape of cruciate ligaments was clearly visible at E17. The lengths of the anterior cruciate ligament (ACL and posterior cruciate ligament (PCL increased gradually from E17 to E19 and drastically at E20. Distances between attachment points to the femur and tibia gradually increased. The ACL angle and PCL angle gradually decreased. The cross angle of the cruciate ligaments changed in three planes. The primordium of the 3D structure of rat cruciate ligaments was constructed from the early stage, with the completion of the development of the structures occurring just before birth.

  10. FUNCTIONAL OUTCOME FOLLOWING RECONSTRUCTION FOR CHRONIC ISOLATED DORSAL DISTAL RADIOULNAR JOINT INSTABILITY BY FULKERSON-WATSON METHOD-A PROSPECTIVE STUDY

    Santhamoorthy

    2014-10-01

    Full Text Available BACKGROUND: Chronic isolated distal radioulnar joint instability is a relatively rare entity. Several methods of reconstruction were available to stabilize the joint and each method has some advantage over others. We proposed to assess the functional outcome following reconstruction of chronic dorsal distal radio ulnar instability using extra articular reconstruction by Fulkerson – Watson method. AIM: To assess the functional outcome following reconstruction for chronic isolated dorsal distal radio ulnar instability using Fulkerson –Watson method. METHODS: We conducted a prospective study in five patients over three years from 2010 to 2013 with chronic isolated dorsal distal radio ulnar instability who were treated by Fulkerson-Watson method of reconstruction. All patients underwent MRI evaluation before surgery to assess ligament pathology and for adequacy of sigmoid notch. Arthroscopy performed in all patients. Functional outcomes were assessed using VAS score, quick-DASH score and Mayo wrist score at every 6 months follow-up. Radiological assessment done using plain x-rays at each follow up. RESULTS: Three patients required Arthroscopic debridement for TFCC. All five patients had achieved stability at distal radio ulnar joint after surgery and remained so till their last follow up. One patient had persistent pain near ulnar styloid. The average loss of motion for pronation was 10 degrees and supination was 3 degrees in reference to the normal side. All except one patient achieved ulnar grip strength of >90 % compared to normal side. The mean pre and postoperative VAS score, quick-DASH score, Mayo wrist score were 76.6 and 17.2, 37.3 and 11.3, 45 and 77 respectively. CONCLUSION: Though extra articular reconstruction for DRUJ by Fulkerson-Watson method is non-anatomical, the procedure is simple than intra articular reconstruction and gives similar functional outcome like intra articular reconstructions as shown by our results.

  11. Surgical Reconstruction with the Remnant Ligament Improves Joint Position Sense as well as Functional Ankle Instability: A 1-Year Follow-Up Study

    Kamizato Iwao

    2014-01-01

    Full Text Available Introduction. Chronic functional instability—characterized by repeated ankle inversion sprains and a subjective sensation of instability—is one of the most common residual disabilities after an inversion sprain. However, whether surgical reconstruction improves sensorimotor control has not been reported to date. The purpose of this study was to assess functional improvement of chronic ankle instability after surgical reconstruction using the remnant ligament. Materials and Methods. We performed 10 cases in the intervention group and 20 healthy individuals as the control group. Before and after surgical reconstruction, we evaluated joint position sense and functional ankle instability by means of a questionnaire. Results and Discussion. There was a statistically significant difference between the control and intervention groups before surgical reconstruction. Three months after surgery in the intervention group, the joint position sense was significantly different from those found preoperatively. Before surgery, the mean score of functional ankle instability in the intervention group was almost twice as low. Three months after surgery, however, the score significantly increased. The results showed that surgical reconstruction using the remnant ligament was effective not only for improving mechanical retensioning but also for ameliorating joint position sense and functional ankle instability.

  12. Comparison of Short-term Complications Between 2 Methods of Coracoclavicular Ligament Reconstruction

    Rush, Lane N.; Lake, Nicholas; Stiefel, Eric C.; Hobgood, Edward R.; Ramsey, J. Randall; O’Brien, Michael J.; Field, Larry D.; Savoie, Felix H.

    2016-01-01

    Background: Numerous techniques have been used to treat acromioclavicular (AC) joint dislocation, with anatomic reconstruction of the coracoclavicular (CC) ligaments becoming a popular method of fixation. Anatomic CC ligament reconstruction is commonly performed with cortical fixation buttons (CFBs) or tendon grafts (TGs). Purpose: To report and compare short-term complications associated with AC joint stabilization procedures using CFBs or TGs. Study Design: Cohort study; Level of evidence, 3. Methods: We conducted a retrospective review of the operative treatment of AC joint injuries between April 2007 and January 2013 at 2 institutions. Thirty-eight patients who had undergone a procedure for AC joint instability were evaluated. In these 38 patients with a mean age of 36.2 years, 18 shoulders underwent fixation using the CFB technique and 20 shoulders underwent reconstruction using the TG technique. Results: The overall complication rate was 42.1% (16/38). There were 11 complications in the 18 patients in the CFB group (61.1%), including 7 construct failures resulting in a loss of reduction. The most common mode of failure was suture breakage (n = 3), followed by button migration (n = 2) and coracoid fracture (n = 2). There were 5 complications in the TG group (25%), including 3 cases of asymptomatic subluxation, 1 symptomatic suture granuloma, and 1 superficial infection. There were no instances of construct failure seen in TG fixations. CFB fixation was found to have a statistically significant increase in complications (P = .0243) and construct failure (P = .002) compared with TG fixation. Conclusion: CFB fixation was associated with a higher rate of failure and higher rate of early complications when compared with TG fixation. PMID:27504468

  13. Tectonic and thermal reconstruction by joint inversion of many wells in the North Sea area

    Nielsen, S.B.

    2003-12-01

    This report develops and applies a method for joint inverse tectonic and thermal analysis of many wells in the central and Easten North Sea area. The model simultaneously considers the thermal and topographic effects from a number of processes on widely differing length and time scales. The processes are: 1) changing asthenospheric temperatures coupled with changing rates of material up- or down-welling in asthenosphere and lithosphere, 2) tectonic processes in the form of pure shear extension or compression, 3) sediment compaction, 4) halokinetics, 5) all loading effects, 6) global sea level variations, 7) surface temperature variations and 8) lateral variations of the crustal contribution to heat flow. Data for the model were obtained from compilation of many North Sea wells, 40 of which were used in the present study. The model results give for the first time a quantitative indication of the relationship between the general geological evolution of the North Sea over 300 Ma and the regional and more localised geodynamic processes, which set the scene for this evolution. Thus the Permo-Triassic post-rift sequence is accommodated by thermal relaxation of the lithosphere-asthenosphere system, enhanced by a decreasing rate of material upwelling and a falling asthenospheric temperature. The rise of the Middle Jurassic dome, which led to the North Sea wide mid-Kimmerian inconformity, is related to an increasing rate of material upwelling and increasing asthenospheric temperature. The demise of the dome and the associated reduction in upwelling rate and cooling of the lithosphere-asthenosphere system provided accommodation space for the post-mid Cretaceous sedimentary succession. It cannot be explained in terms of Late Jurassic lithospheric extension. Heat flow shows a smooth decline over 300 Ma. Neither rifting nor doming episodes appear to have influenced the overall heat flow significantly in the study area. In the case of rifting this is partly due to thermal

  14. Enhanced knee joint function due to accelerated rehabilitation exercise after anterior cruciate ligament reconstruction surgery in Korean male high school soccer players

    Lee, Myungchun; SUNG, Dong Jun; Lee, Joohyung; Oh, Inyoung; Kim, SoJung; Kim, Seungho; Kim, Jooyoung

    2016-01-01

    This study was conducted on Korean male high school soccer players who underwent anterior cruciate ligament reconstruction (ACLR) to identify the effects of an accelerated rehabilitation exercise (ARE) program on knee joint isometric strength, thigh circumference, Lysholm score, and active balance agility. We assigned eight test participants each to a physical therapy group (PTG) and an accelerated rehabilitation exercise group (AREG), and compared differences between the groups. Both the PTG...

  15. The Possibilities of Full-Color Three-Dimensional Reconstruction of Biological Objects by the Method of Layer-By-Layer Overlapping: Knee Joint of a Rat

    Terpilovskiy A.A.; Tiras K.P.; Khoperskov A.V.; Novochadov V.V.

    2015-01-01

    The article has a goal to demonstrate capabilities of layer-by-layer overlapping method for 3D-reconstruction of knee joint. The model object was chosen for this research to provide the base for new methods in diagnostics and treatment of human orthopedic diseases. We used the original technology of high-precision grinding and compared the ability of quantitative analysis of bone and cartilage tissue on 3D models to the capabilities of classical morphometry of histological slices. Obtained di...

  16. Quadruple-component superficial circumflex iliac artery perforator (SCIP) flap: A chimeric SCIP flap for complex ankle reconstruction of an exposed artificial joint after total ankle arthroplasty.

    Yamamoto, Takumi; Saito, Takafumi; Ishiura, Ryohei; Iida, Takuya

    2016-09-01

    Total ankle arthroplasty (TAA) is becoming popular in patients with rheumatoid arthritis (RA)-associated ankle joint degeneration. However, ankle wound complications can occur after TAA, which sometimes requires challenging reconstruction due to anatomical complexity of the ankle. Superficial circumflex iliac artery (SCIA) perforator (SCIP) flap has been reported to be useful for various reconstructions, but no case has been reported regarding a chimeric SCIP flap for complex ankle reconstruction. We report a case of complex ankle defect successfully reconstructed with a free quadruple-component chimeric SCIP flap. A 73-year-old female patient with RA underwent TAA, and suffered from an extensive ankle soft tissue defect (13 × 5 cm) with exposure of the implanted artificial joint and the extensor tendons. A chimeric SCIP flap was raised based on the deep branch and the superficial branch of the SCIA, which included chimeric portions of the sartorius muscle, the deep fascia, the inguinal lymph node (ILN), and the skin/fat. The flap was transferred to the recipient ankle. The sartorius muscle was used to cover the artificial joint, the deep fascia to reconstruct the extensor retinaculum, the ILN to prevent postoperative lymphedema, and the adiposal tissue to put around the extensor tendons for prevention of postoperative adhesion. Postoperatively, the patient could walk by herself without persistent leg edema or bowstringing of the extensor tendons, and was satisfied with the concealable donor scar. Although further studies are required to confirm efficacy, multicomponent chimeric SCIP has a potential to be a useful option for complex defects of the ankle. PMID:27423250

  17. A Three-Dimensional Skeletal Reconstruction of the Stem Amniote Orobates pabsti (Diadectidae: Analyses of Body Mass, Centre of Mass Position, and Joint Mobility.

    John A Nyakatura

    Full Text Available Orobates pabsti, a basal diadectid from the lower Permian, is a key fossil for the understanding of early amniote evolution. Quantitative analysis of anatomical information suffers from fragmentation of fossil bones, plastic deformation due to diagenetic processes and fragile preservation within surrounding rock matrix, preventing further biomechanical investigation. Here we describe the steps taken to digitally reconstruct MNG 10181, the holotype specimen of Orobates pabsti, and subsequently use the digital reconstruction to assess body mass, position of the centre of mass in individual segments as well as the whole animal, and study joint mobility in the shoulder and hip joints. The shape of most fossil bone fragments could be recovered from micro-focus computed tomography scans. This also revealed structures that were hitherto hidden within the rock matrix. However, parts of the axial skeleton had to be modelled using relevant isolated bones from the same locality as templates. Based on the digital fossil, mass of MNG 10181 was estimated using a model of body shape that was varied within a plausible range to account for uncertainties of the dimension. In the mean estimate model the specimen had an estimated mass of circa 4 kg. Varying of the mass distribution amongst body segments further revealed that Orobates carried most of its weight on the hind limbs. Mostly unrestricted joint morphology further suggested that MNG 10181 was able to effectively generate propulsion with the pelvic limbs. The digital reconstruction is made available for future biomechanical studies.

  18. A Three-Dimensional Skeletal Reconstruction of the Stem Amniote Orobates pabsti (Diadectidae): Analyses of Body Mass, Centre of Mass Position, and Joint Mobility.

    Nyakatura, John A; Allen, Vivian R; Lauströer, Jonas; Andikfar, Amir; Danczak, Marek; Ullrich, Hans-Jürgen; Hufenbach, Werner; Martens, Thomas; Fischer, Martin S

    2015-01-01

    Orobates pabsti, a basal diadectid from the lower Permian, is a key fossil for the understanding of early amniote evolution. Quantitative analysis of anatomical information suffers from fragmentation of fossil bones, plastic deformation due to diagenetic processes and fragile preservation within surrounding rock matrix, preventing further biomechanical investigation. Here we describe the steps taken to digitally reconstruct MNG 10181, the holotype specimen of Orobates pabsti, and subsequently use the digital reconstruction to assess body mass, position of the centre of mass in individual segments as well as the whole animal, and study joint mobility in the shoulder and hip joints. The shape of most fossil bone fragments could be recovered from micro-focus computed tomography scans. This also revealed structures that were hitherto hidden within the rock matrix. However, parts of the axial skeleton had to be modelled using relevant isolated bones from the same locality as templates. Based on the digital fossil, mass of MNG 10181 was estimated using a model of body shape that was varied within a plausible range to account for uncertainties of the dimension. In the mean estimate model the specimen had an estimated mass of circa 4 kg. Varying of the mass distribution amongst body segments further revealed that Orobates carried most of its weight on the hind limbs. Mostly unrestricted joint morphology further suggested that MNG 10181 was able to effectively generate propulsion with the pelvic limbs. The digital reconstruction is made available for future biomechanical studies. PMID:26355297

  19. The Possibilities of Full-Color Three-Dimensional Reconstruction of Biological Objects by the Method of Layer-By-Layer Overlapping: Knee Joint of a Rat

    Terpilovskiy A.A.

    2015-12-01

    Full Text Available The article has a goal to demonstrate capabilities of layer-by-layer overlapping method for 3D-reconstruction of knee joint. The model object was chosen for this research to provide the base for new methods in diagnostics and treatment of human orthopedic diseases. We used the original technology of high-precision grinding and compared the ability of quantitative analysis of bone and cartilage tissue on 3D models to the capabilities of classical morphometry of histological slices. Obtained digitized images of thin sections (1200-2600 on each of the 8 joints had a pixel size of 8 x 8 μm, with a vertical step grinding 8 μm. Its software processing allows for the construction of a virtual slice with an offset and slope, required for the adequate visualization of the biological structures. The developed method of high-precision grinding allows obtaining series of digitized cross-sectional images of biological objects, so the virtual object created on its base, is almost devoid of spatial deformations and distortions of color. Morphometric analysis of these 3D reconstructions in terms of precision and informativeness is not inferior, and according to some indicators it exceeds the quantitative study of serial histological sections. The reconstruction, obtained using the high-precision grinding, can be used to create virtual museum exhibits, atlases and manuals in various biological sciences, based on morphological approach to the cognition of its objects. Another application of reconstruction is to convert them into virtual simulators on the principles of augmented reality or into the models for 3D printing of physical simulators and working prototypes for medicine, veterinary, animal science and related areas. This will be of most value where an MRI or histological reconstruction did not provide full three-dimensional picture.

  20. Combined use of free vascularized bone graft and extracorporeally-irradiated autograft for reconstruction of massive bone and joint defects after resection of malignant tumor

    Reconstruction of massive bone defect after resection of malignant tumor by irradiated bone graft is reported. But because irradiated bone graft is dead-bone, it poses are many problems such as fracture, infection, and non-union. To resolve these problems, we combined use of the free vascularized bone graft (VBG) and irradiated bone graft (IRBG). We reviewed 10 patients with a, mean age of 28 years old. The locations were one proximal humerus, one shaft of ulna, two acetabular, one distal femur, and five shaft of tibia. One case developed necrosis by venous thrombus, but the other nine cases survived. Two cases developed nonunion, but the other eight cases achieved union. Oncological outcome was nine none eridence of disease (NED) and one dead of disease (DOD). Muskloskeltal tumor society (MTS) score was 84.5% on average (67-100). Three patients with weight-bearing joint reconstruction using IRBG showed osteoarthritic change in the long-term. Combined use of VBG and IRBG provides good functional assessment by compensating each other. If irradiated osteochondral grafts are used for weight-bearing joints, osteoarthritic changes cannot be avoided but clinical outcome is excellent. (author)

  1. A novel technique for the reconstruction of resected sternoclavicular joints: A case report with a review of the literature

    Waseem M Hajjar

    2013-01-01

    Full Text Available Sternal metastasis in thyroid cancer is an uncommon occurrence with only a handful of cases of chest wall resections being done. Sternal reconstruction for both primary and secondary tumors has been performed using various techniques and materials such as the mesh, methyl acrylate resin, and steel plates; however, this is a case of papillary thyroid cancer involving the sternum in a 50-year-old woman who had resection of the sternum with reconstruction using titanium bars and clips (STRATOS system fixed to the clavicles with an underlying Proceed mesh. STRATOS system showed good recovery postoperatively. The functional results were excellent with the patient being able to perform all daily activities unassisted after 1 month and almost complete range of motion with acceptable limitations in power of the shoulder muscles after 2 months. We have reviewed all the English language publications of the subject by doing Medline search for the last 25 years and we present here the surgical management of this pathology with our novel approach by using the titanium steel bars to stabilize both medial aspects of the resected clavicles as a promising therapy for manubrial reconstruction and clavicular fixation.

  2. An adult case of temporomandibular joint osteoarthritis treated with splint therapy and the subsequent orthodontic occlusal reconstruction

    Hanefi Kurt

    2011-01-01

    Full Text Available Herein we report treatment for a 19-year-old female patient with severe osteoarthritis of the temporomandibular joint. The patient had severe open bite with a Class II molar relationship. She had limited mouth opening and pain. Clinical examination and magnetic resonance imaging revealed that she had anterior disc displacement without reduction. By splint therapy, limited mouth opening and pain was eliminated, but an anterior open bite developed after the treatment. By orthodontic treatment, an acceptable occlusion was achieved with a Class I molar relationship.

  3. The numerical assessment of a full-scale truss reconstructed employing a traditional all-wooden joints

    Milch, J.; Tippner, J.; Sebera, V.; Kunecký, Jiří; Kloiber, Michal; Navrátil, M.

    Brno : Mendel University in Brno, 2015 - (Horáček, P.; Wimmer, R.; Rademacher, P.; Kúdela, J.; Kolářová, V.; Děcký, D.), s. 30-31 ISBN 978-80-7509-255-7. [International conference. InWood2015. Innovation in wood materials and processes.. Brno (CZ), 19.05.2015-22.05.2015] R&D Projects: GA MK(CZ) DF12P01OVV004 Keywords : timber structures * all-wooden joints * mechanical behaviour Subject RIV: AL - Art, Architecture, Cultural Heritage http://www.inwood-project.eu/sites/default/files/inwood2015_proceedings.pdf

  4. Joint reconstruction of galaxy clusters from gravitational lensing and thermal gas I. Outline of a non-parametric method

    Konrad, Sara; Meyer, Sven; Sarli, Eleonora; Bartelmann, Matthias

    2013-01-01

    We present a method to estimate the lensing potential from massive galaxy clusters for given observational X-ray data. The concepts developed and applied in this work can easily be combined with other techniques to infer the lensing potential, e.g. weak gravitational lensing or galaxy kinematics, to obtain an overall best fit model for the lensing potential. After elaborating on the physical details and assumptions the method is based on, we explain how the numerical algorithm itself is implemented with a Richardson-Lucy algorithm as a central part. Our reconstruction method is tested on simulated galaxy clusters with a spherically symmetric NFW density profile filled with gas in hydrostatic equilibrium. We describe in detail how these simulated observational data sets are created and how they need to be fed into our algorithm. We test the robustness of the algorithm against small parameter changes and estimate the quality of the reconstructed lensing potentials. As it turns out we achieve a very high degree ...

  5. Dose reconstruction for the Urals population: Joint Coordinating Committee on Radiation Effects Research Project 1.1. Final report

    Degteva, M.O.; Drozhko, E.; Anspaugh, L.R.; Napier, B.A.; Bouville, A.C.; Miller, C.W. [US-Russia Joint Coordinating Committee on Radiation Effects Research (International organizations without location)

    1996-01-01

    Population exposure in the Urals occurred as a result of failures in the technological processes at the Mayak plutonium facility in the 1950s. Construction of the Mayak facility began in 1945 and was completed in 1948. Initially this complex consisted of three main parts: Reactor plant, radiochemical facility, and waste-management facilities. The major sources of radioactive contamination were the discharges of 2.7 x 10{sup 6}Ci of liquid wastes into the Techa River (1949-1956); an explosion in the radioactive waste storage facility in 1957 (the so-called Kyshtym Accident) that formed the East Urals Radioactive Trace (EURT) due to dispersion. of 2 x 10{sup 6}Ci into the atmosphere; and gaseous aerosol releases (about 560,000 Ci of {sup 131}I in total) within the first decades of the facility`s operation. The significant portion of activity for the Techa River and EURT consists of long-lived radionuclides, mainly {sup 9O}Sr. These releases resulted in the long-lived contamination of surrounding territories. The predominant radionuclide for operating gaseous aerosol releases was short-lived {sup 131}I resulting from reprocessing of nuclear fuel. The maximal annual rates, which occurred in 1952-1953, were reconstructed on the basis of technological records by the Mayak team.

  6. Dose reconstruction for the Urals population. Joint Coordinating Committee on Radiation Effects Research, Project 1.1 -- Final report

    Degteva, M.O. [Urals Research Center for Radiation Medicine, Chelyabinsk (Russian Federation); Drozhko, E. [Branch 1 of Moscow Biophysics Inst., Ozersk (Russian Federation); Anspaugh, L.R. [Lawrence Livermore National Lab., CA (United States); Napier, B.A. [Pacific Northwest National Lab., Richland, WA (United States); Bouville, A.C. [National Cancer Inst., Bethesda, MD (United States); Miller, C.W. [Centers for Disease Control and Prevention, Atlanta, GA (United States)

    1996-02-01

    This work is being carried out as a feasibility study to determine if a long-term course of work can be implemented to assess the long-term risks of radiation exposure delivered at low to moderate dose rates to the populations living in the vicinity of the Mayak Industrial Association (MIA). This work was authorized and conducted under the auspices of the US-Russian Joint Coordinating Committee on Radiation Effects Research (JCCRER) and its Executive Committee (EC). The MIA was the first Russian site for the production and separation of plutonium. This plant began operation in 1948, and during its early days there were technological failures that resulted in the release of large amounts of waste into the rather small Techa River. There were also gaseous releases of radioiodines and other radionuclides during the early days of operation. In addition, there was an accidental explosion in a waste storage tank in 1957 that resulted in a significant release. The Techa River Cohort has been studied for several years by scientists from the Urals Research Centre for Radiation Medicine and an increase in both leukemia and solid tumors has been noted.

  7. Dose reconstruction for the Urals population. Joint Coordinating Committee on Radiation Effects Research, Project 1.1 -- Final report

    This work is being carried out as a feasibility study to determine if a long-term course of work can be implemented to assess the long-term risks of radiation exposure delivered at low to moderate dose rates to the populations living in the vicinity of the Mayak Industrial Association (MIA). This work was authorized and conducted under the auspices of the US-Russian Joint Coordinating Committee on Radiation Effects Research (JCCRER) and its Executive Committee (EC). The MIA was the first Russian site for the production and separation of plutonium. This plant began operation in 1948, and during its early days there were technological failures that resulted in the release of large amounts of waste into the rather small Techa River. There were also gaseous releases of radioiodines and other radionuclides during the early days of operation. In addition, there was an accidental explosion in a waste storage tank in 1957 that resulted in a significant release. The Techa River Cohort has been studied for several years by scientists from the Urals Research Centre for Radiation Medicine and an increase in both leukemia and solid tumors has been noted

  8. Via de acesso cirúrgico posterossuperior para o tratamento das luxações acromioclaviculares: resultados de 84 casos operados Posterosuperior surgical access route for treatment of acromioclavicular dislocations: results from 84 surgical cases

    Danilo Canesin Dal Molin

    2012-10-01

    Full Text Available OBJETIVO: Avaliar os resultados do tratamento cirúrgico de 84 luxações acromioclaviculares agudas com a utilização da via de acesso posterossuperior do ombro. MÉTODOS: Foram avaliados 84 casos de luxações acromioclaviculares agudas grau III da classificação de Allman-Tossy operados de novembro de 2002 a maio de 2010. A média de idade dos pacientes foi de 34 anos. O diagnóstico foi realizado por avaliação clínica e radiográfica. Os pacientes foram operados pela mesma equipe cirúrgica em até três semanas da data do trauma realizando-se a via de acesso posterossuperior do ombro com acesso ao topo da base do processo coracoide para colocação de duas âncoras utilizadas na redução da luxação. O seguimento mínimo foi de 12 meses. A avaliação clínica-radiográfica pós-operatória foi realizada pelos critérios de Karlsson modificados e do escore da Universidade da Califórnia em Los Angeles (UCLA. RESULTADOS: Dos 84 pacientes operados, 92,8% apresentavam resultados bons ou excelentes e 7,2% de resultados regulares ou fracos pelo escore de avaliação da UCLA. Pelos critérios de Karlsson modificados 76,2% foram avaliados como grau A, 17,9% como grau B e 5,9% como grau C. CONCLUSÃO: A VIA de acesso posterossuperior do ombro é uma nova opção para acesso ao processo coracoide e tratamento das luxações acromioclaviculares, com resultados clínicos e radiográficos equivalentes aos da literatura.OBJECTIVE: To evaluate the results from surgical treatment of 84 cases of acute acromioclavicular dislocation, using a posterosuperior access route. METHODS: Eighty-four cases of acute acromioclavicular dislocation (grade III in the Allman-Tossy classification operated between November 2002 and May 2010 were evaluated. The patients' mean age was 34 years. The diagnoses were made using clinical and radiographic evaluations. The patients were operated by the same surgical team, within three weeks of the date of the trauma, using a

  9. 肩锁关节脱位的诊断与治疗%Diagnosis and treatment of acromioclavicular dislocation

    黄高; 王金华; 孔建中

    2012-01-01

    The acromioclavicular dislocation is a type of common shoulder athletic injury in clinic , and its incidence accounted for 12% of the local sites injuries. At present,The acute dislocation of Rockwood type I , II was recommended to be managed non -operatively, while acute dislocation of type IV, V and VI operatively. But there still exist controversial in the treatment of acute dislocation of type III. In this peper, the authors have reviewed the current status of treatment of acromioclavicular dislocation .%肩锁关节脱位是临床常见的肩部运动损伤.目前,临床认为Rockwood Ⅰ、Ⅱ型急性脱位应行非手术治疗,Ⅳ、V及Ⅵ型急性脱位应行手术治疗,但对Ⅲ型急性脱位是采取非手术治疗还是手术治疗仍存在争议.本文对肩锁关节脱位的治疗现状进行综述.

  10. Biological and biomechanical properties of reconstructing anterior cruciate ligament of knee joint%膝关节前交叉韧带重建的生物学及生物力学特性

    李俊敏; 李增炎

    2005-01-01

    目的:通过总结前交叉韧带重建的生物学及生物力学特性,探讨早期锻炼对膝关节前交叉韧带重建后移植物愈合及膝关节运动功能恢复的作用.资料来源:应用计算机检索MEDLINE1970-01/2004-01期间有关膝关节前交叉韧带重建及其生物力学特征的文献,检索词"anterior cruciate ligament,knee ioint,biomechanics",并限定文章语言种类为英文.资料选择:对资料进行初审,选择有关膝关节前交叉韧带重建及其生物力学特征的文献,开始查找全文.选择随机对照类文章,当同一作者有多篇文章时,选择病例数最多的予以纳入;排除综述类及Mete分析类文章.质量评价主要考察资料的真实性,调查、实施过程是否严密.资料提炼:共检索到46篇有关膝关节前交叉韧带重建及其生物力学特征的文章,29篇符合以上纳入标准,排除的17篇文章中,9篇为小样本分析,8篇为综述类或Mete分析类文章.资料综合:通过了解正常前交叉韧带的生物力学特征制定重建措施及康复计划指导.重建后前交叉韧带动物实验提示膝关节运动功能恢复均不理想,而人体实验结果优于动物.随机对照实验表明,前交叉韧带重建后立即持重不增加膝关节的松弛性,反而有利于减轻髌骨疼痛.结论:前交叉韧带损伤重建后固定膝关节,限制关节周围肌肉收缩活动,导致韧带、关节及周围肌肉运动功能受限.早期康复锻炼可以减轻疼痛,改善关节软骨代谢,防止关节囊挛缩,有助于重建后膝关节前交叉韧带运动功能的恢复.%OBJECTIVE: To probe into the function of early exercises on healing of grafts after anterior cruciate ligament (ACL) reconstruction and on motor function recovery of knee joint by summarizing biology and biomechanical properties of ACL reconstruction.DATA SOURCES: The relevant literatures on ACL reconstruction of knee joint and its biomechanical properties were looked up in

  11. Biomechanical loading of the shoulder complex and lumbosacral joints during dynamic cart pushing task.

    Nimbarte, Ashish D; Sun, Yun; Jaridi, Majid; Hsiao, Hongwei

    2013-09-01

    The primary objective of this study was to quantify the effect of dynamic cart pushing exertions on the biomechanical loading of shoulder and low back. Ten participants performed cart pushing tasks on flat (0°), 5°, and 10° ramped walkways at 20 kg, 30 kg, and 40 kg weight conditions. An optoelectronic motion capturing system configured with two force plates was used for the kinematic and ground reaction force data collection. The experimental data was modeled using AnyBody modeling system to compute three-dimensional peak reaction forces at the shoulder complex (sternoclavicular, acromioclavicular, and glenohumeral) and low back (lumbosacral) joints. The main effect of walkway gradient and cart weight, and gradient by weight interaction on the biomechanical loading of shoulder complex and low back joints was statistically significant (all p distraction loading of glenohumeral joint and inferosuperior loading of the acromioclavicular joint may contribute to the risk of work-related low back and shoulder musculoskeletal disorder with prolonged and repetitive use of carts. PMID:23566675

  12. Treatment of patients with acromioclavicular joint injuries (Rockwood II-VI) with modeled Kirschner wire and cortical screw

    Ivan Viktorovich Borozda; Mikhail Anatolievich Danilov; Kirill Sergeevich Golokhvast

    2015-01-01

    Objective:To propose an original method of surgical treatment for the acromial extremity of the clavicle rupture (Rockwood II-VI) with modeled Kirschner wire and cortical screw. Methods:Anatomical study and a test method were applied to 43 cadavers of both sexes. During the period between 2000 and 2013, 34 patients of both sexes were operated upon using the new method. In the comparison group (n=120), the fixation of the acromial extremity of the clavicle rupture was performed with hamate plate, Lee hook and Kirschner wires. Results:Its application allows, according to the evaluation scale of Constant and Murley (1987), 10%more preservation of the function of the shoulder compared with traditional methods of surgical treatment, and shortens the required hospital treatment and temporary disability periods. Conclusions: It is shown that the proposed author’s method combines low invasiveness, minimum dimensions of the construction and low-cost treatment.

  13. Treatment of patients with acromioclavicular joint injuries(Rockwood II-VI) with modeled Kirschner wire and cortical screw

    Ivan; Viktorovich; Borozda; Mikhail; Anatolievich; Danilov; Kirill; Sergeevich; Golokhvast

    2015-01-01

    Objective: To propose an original method of surgical treatment for the acromial extremity of the clavicle rupture(Rockwood II-VI) with modeled Kirschner wire and cortical screw. Methods: Anatomical study and a test method were applied to 43 cadavers of both sexes. During the period between 2000 and 2013, 34 patients of both sexes were operated upon using the new method. In the comparison group(n = 120), the fixation of the acromial extremity of the clavicle rupture was performed with hamate plate, Lee hook and Kirschner wires.Results: Its application allows, according to the evaluation scale of Constant and Murley(1987), 10% more preservation of the function of the shoulder compared with traditional methods of surgical treatment, and shortens the required hospital treatment and temporary disability periods.Conclusions: It is shown that the proposed author’s method combines low invasiveness, minimum dimensions of the construction and low-cost treatment.

  14. Joint-sparing Corrections in Malunited Lisfranc Joint Injuries.

    Nery, Caio; Raduan, Fernando; Baumfeld, Daniel

    2016-03-01

    Lisfranc fracture-dislocations are very serious and potentially disabling injuries. Unfortunately, they are often misdiagnosed. Multiplanar midfoot deformities that result from these fracture-dislocations are precursors of joint degeneration and significant functional disabilities. Anatomic reduction with different types of internal fixation is an efficient method to reconstruct midfoot alignment and stability. Joint-preserving reconstruction techniques emerge as a viable alternative to corrective fusion as they achieve stable joint realignment with preserved motion. PMID:26915786

  15. Joint swelling

    Swelling of a joint ... Joint swelling may occur along with joint pain . The swelling may cause the joint to appear larger or abnormally shaped. Joint swelling can cause pain or stiffness. After an ...

  16. MRI based volumetric assessment of knee cartilage after ACL-reconstruction, correlated with qualitative morphologic changes in the joint and with clinical outcome. Is there evidence for early posttraumatic degeneration?

    Purpose: The purpose of this study was to analyze potential quantitative and qualitative changes of the knee cartilage and joint indicative of early posttraumatic OA 4 years after ACL-reconstruction and to correlate the MRI-findings with the clinical outcome (CO). Materials and Methods: 1.5 T MRI-scans were performed on 9 patients post-op and 4 years later. Using a high-resolution T 1-w-fs-FLASH-3D-sequence cartilage volume (cVol) and thickness (mTh) were quantified. Using standard PD-w fs and T 1-w sequences qualitative changes of the joint structures were analyzed based on the WORMS-score. CO was rated by an orthopaedic surgeon using Lysholm-score, OAK-score, Tegner-activity-score (TAS), and Arthrometer KT-1000 testing. Results: Mean changes of cVol were -1.8 % (range: -5.9 %; + 0.7 %) and of mTh -0.8 % (range: -3.0 %; + 1.1 %). No significant change (95 %-CI) could be identified for any compartment. Three patients developed new peripatellar ostheophytes, acute trauma related changes mostly decreased. Mean outcome of Lysholm-score and OAK-score were 90 pts and 86 pts, mean TAS was 4.3 pts. Average maximum tibial translation reached 5.2 mm comparing to 6.7 mm on the healthy contralateral side. Conclusion: Despite a tendency towards decreased cVol and mTh 4 years after ACL-reconstruction qMRI revealed no significant cartilage loss. Newly developing osteophytes did not match with the observed good CO. This small pilot study motivates future quantitative and qualitative-structural MRI-based assessment of articular cartilage and other joint structures in order to improve diagnostic tools for the detection of early OA. (orig.)

  17. Mycobacterium avium-intracellulare cellulitis occurring with septic arthritis after joint injection: a case report

    Murdoch David M

    2007-02-01

    Full Text Available Abstract Background Cellulitis caused by Mycobacterium avium-intracellulare has rarely been described. Mycobacterium avium-intracellulare is a rare cause of septic arthritis after intra-articular injection, though the causative role of injection is difficult to ascertain in such cases. Case presentation A 57-year-old with rheumatoid arthritis treated with prednisone and azathioprine developed bilateral painful degenerative shoulder arthritis. After corticosteroid injections into both acromioclavicular joints, he developed bilateral cellulitis centered over the injection sites. Skin biopsy showed non-caseating granulomas, and culture grew Mycobacterium avium-intracellulare. Joint aspiration also revealed Mycobacterium avium-intracellulare infection. Conclusion Although rare, skin and joint infections caused by Mycobacterium avium-intracellulare should be considered in any immunocompromised host, particularly after intra-articular injection. Stains for acid-fast bacilli may be negative in pathologic samples even in the presence of infection; cultures of tissue specimens should always be obtained.

  18. 夹马口节水改扩建工程渡槽接缝止水设计方案%Design Scheme for Joint Sealing of Aqueduct in Jiamakou Water-saving Reconstruction Project

    徐睿

    2011-01-01

    Through the comparison and selection for the sealing types and sealing materials of joints of the aqueduct, the bond-type sealing plan is used in the joint sealing of the [/-shaped aqueduct in Jiamakou water-saving reconstruction project, which has good sealing effect and strong durability, and is simple in the construction and easy to guarantee the quality of the construction. After more than a year of practical application, it is demonstrated that the bond-type sealing method used in the project has a good effect and comprehensive functions, and is worth popularizing.%通过对渡槽接缝止水形式及止水材料的比选,确定夹马口节水改扩建工程U形渡槽接缝止水采用止水效果好、耐久性强、施工简单且质量容易保证的粘合式止水方案.经过一年多时间的实际运用,证明该工程所采用的粘合式止水,效果良好,功能全面,值得推广应用.

  19. CLINICAL APPLICATION OF ARTIFICIAL CONDYLAR PROCESS FOR RECONSTRUCTING TEMPOROMANDIBULAR JOINT%人工髁突假体在颞下颌关节重建中的临床应用

    黄相道; 邵占英; 王发生; 段毅

    2012-01-01

    Objective To assess the feasibility and clinical outcomes of artificial condylar process in reconstruction of the temporomandibular joint. Methods Between January 2005 and January 2010, the reconstructions of the temporomandibular joints with artificial condylar process were performed in 10 cases (11 sides, including 7 left sides and 4 right sides). There were 7 males and 3 females with an average age of 50 years (range, 40-68 years). Mandibular condyle defects were caused by mandible tumor in 7 patients with a mean disease duration of 15 months (range, 9-24 months) and by bilateral condylar fractures in 3 patients with the disease duration of 2, 3, and 2 days respectively. According to Neff classification, there were type M and A in 1 case, type M and B in 1 case, and type M in one side and subcondylar fracture in the other side in 1 case. Results Incisions in all patients healed by first intention, and no complication occurred. All cases were followed up 1 to 4 years, showed facial symmetry and good occluding relation, and the mouth opening was 22-38 mm (mean, 30 mm). No temporomandibular joint clicking or pain and no recurrence of tumor were observed. Most of the artificial condylar process were in good position except 1 deviated from the correct angle slightly. All the patients could have diet normally. Conclusion The results of temporomandibular joint reconstruction after tumor resection with artificial condylar process are good, but the clinical outcome for intracapsular condylar fracture is expected to be further verified.%目的 探讨人工髁突假体应用于颞下颌关节重建的可行性及临床治疗效果.方法 2005年1月-2010年1月,对10例(11侧)患者应用人工髁突假体行颢下颌关节重建手术.男7例,女3例;年龄40~68岁,平均50岁.左侧7侧,右侧4侧.下颌骨肿瘤7例,病程9~24个月,平均15个月.双侧髁突囊内骨折3例,其中交通事故伤2例,高处坠落伤1例;伤后至入院时间分别为2、3、2d;骨

  20. Joint surface reconstruction and 4D deformation estimation from sparse data and prior knowledge for marker-less Respiratory motion tracking

    Purpose: The intraprocedural tracking of respiratory motion has the potential to substantially improve image-guided diagnosis and interventions. The authors have developed a sparse-to-dense registration approach that is capable of recovering the patient's external 3D body surface and estimating a 4D (3D + time) surface motion field from sparse sampling data and patient-specific prior shape knowledge.Methods: The system utilizes an emerging marker-less and laser-based active triangulation (AT) sensor that delivers sparse but highly accurate 3D measurements in real-time. These sparse position measurements are registered with a dense reference surface extracted from planning data. Thereby a dense displacement field is recovered, which describes the spatio-temporal 4D deformation of the complete patient body surface, depending on the type and state of respiration. It yields both a reconstruction of the instantaneous patient shape and a high-dimensional respiratory surrogate for respiratory motion tracking. The method is validated on a 4D CT respiration phantom and evaluated on both real data from an AT prototype and synthetic data sampled from dense surface scans acquired with a structured-light scanner.Results: In the experiments, the authors estimated surface motion fields with the proposed algorithm on 256 datasets from 16 subjects and in different respiration states, achieving a mean surface reconstruction accuracy of ±0.23 mm with respect to ground truth data—down from a mean initial surface mismatch of 5.66 mm. The 95th percentile of the local residual mesh-to-mesh distance after registration did not exceed 1.17 mm for any subject. On average, the total runtime of our proof of concept CPU implementation is 2.3 s per frame, outperforming related work substantially.Conclusions: In external beam radiation therapy, the approach holds potential for patient monitoring during treatment using the reconstructed surface, and for motion-compensated dose delivery using

  1. Joint surface reconstruction and 4D deformation estimation from sparse data and prior knowledge for marker-less Respiratory motion tracking

    Berkels, Benjamin; Rumpf, Martin [Institute for Numerical Simulation, Rheinische Friedrich-Wilhelms-Universität Bonn, 53115 Bonn (Germany); Bauer, Sebastian [Pattern Recognition Lab, Department of Computer Science, Friedrich-Alexander-Universität Erlangen-Nürnberg, 91058 Erlangen (Germany); Ettl, Svenja; Arold, Oliver [Institute of Optics, Information, and Photonics, Friedrich-Alexander-Universität Erlangen-Nürnberg, 91058 Erlangen (Germany); Hornegger, Joachim [Pattern Recognition Lab, Department of Computer Science, Friedrich-Alexander-Universität Erlangen-Nürnberg, 91058 Erlangen, Germany and Erlangen Graduate School in Advanced Optical Technologies (SAOT), 91058 Erlangen (Germany)

    2013-09-15

    Purpose: The intraprocedural tracking of respiratory motion has the potential to substantially improve image-guided diagnosis and interventions. The authors have developed a sparse-to-dense registration approach that is capable of recovering the patient's external 3D body surface and estimating a 4D (3D + time) surface motion field from sparse sampling data and patient-specific prior shape knowledge.Methods: The system utilizes an emerging marker-less and laser-based active triangulation (AT) sensor that delivers sparse but highly accurate 3D measurements in real-time. These sparse position measurements are registered with a dense reference surface extracted from planning data. Thereby a dense displacement field is recovered, which describes the spatio-temporal 4D deformation of the complete patient body surface, depending on the type and state of respiration. It yields both a reconstruction of the instantaneous patient shape and a high-dimensional respiratory surrogate for respiratory motion tracking. The method is validated on a 4D CT respiration phantom and evaluated on both real data from an AT prototype and synthetic data sampled from dense surface scans acquired with a structured-light scanner.Results: In the experiments, the authors estimated surface motion fields with the proposed algorithm on 256 datasets from 16 subjects and in different respiration states, achieving a mean surface reconstruction accuracy of ±0.23 mm with respect to ground truth data—down from a mean initial surface mismatch of 5.66 mm. The 95th percentile of the local residual mesh-to-mesh distance after registration did not exceed 1.17 mm for any subject. On average, the total runtime of our proof of concept CPU implementation is 2.3 s per frame, outperforming related work substantially.Conclusions: In external beam radiation therapy, the approach holds potential for patient monitoring during treatment using the reconstructed surface, and for motion-compensated dose delivery

  2. Surgical Treatment Experience of Patients With Acromioclavicular Dislocation%肩锁关节脱位患者的手术治疗体会

    王凤彦

    2015-01-01

    目的:对肩锁关节脱位患者的手术治疗方法以及效果进行分析,并对手术治疗体会进行总结。方法选取于2013年11月~2014年8月期间在我院接受治疗的35例肩锁关节脱位患者,并对所有患者进行手术治疗,对手术方法和效果进行总结。结果按照Karlsson评价标准来评定术后疗效,优27例,占比77.1%,良5例,占比14.3%,差3例,占比8.6%,则本次研究的优良率为91.4%。结论对肩锁关节脱位患者采用手术治疗具有十分显著的临床效果,并且具有固定可靠、减少疼痛、防止肩部畸形以及获得较好的肩关节功能等诸多优点。%Objective To analyze surgical treatment method and its effect of patients with acromioclavicular dislocation and then summarize its surgical treatment experience.Methods Choose 35 patients with acromioclavicular dislocation who are received and treated in hospital from November 2013 to August 2014 and have them cured with surgical treatment and then make a summary of treatment experience.ResultsMake an evaluation on surgery treatment effect according to Karlsson standard, the result shows that 27 cases of performance are excellent, accounting 77.1%; 5 cases of performance are good, accounting 14.3%; and 3 cases of performance are bad, accounting 8.6%, the treatment excellence rate is up to 91.4%. Conclusion Surgical treatment is of efifcacy in treatment of patients with acromioclavicular dislocation; and such a treatment method has advantages of reliable fixation and pain alleviation, prevention form shoulder deformation and improvement of shoulder function; thus, surgical treatment is quite worthwhile to be promoted and applied clinically in treatment of acromioclavicular dislocation.

  3. Establishment of a cohort for the long-term clinical follow-up with dose reconstruction under the joint medical research project conducted by Sasakawa Memorial Health Foundation (Japan) and the Research Institute of Radiation Hygiene (Russia)

    The cohort of children in the western districts of the Bryansk Region of Russia exposed to radiation following the Chernobyl accident is described in this paper. The cohort was selected under the Joint Medical Research Project on Dosimetry Associated with the Chernobyl Accident conducted by Sasakawa Memorial Health Foundation (SMHF, Japan) and the Research Institute of Radiation Hygiene (RIRH, Russia). The subjects of the Research Project are those people residing in the most contaminated areas of Russia who was 0 to 10 years old at the time of exposure. At the moment the cohort comprises 1210 subjects, though this number may slightly decrease in course of a follow-up in view of migration of population. Most of cohort subjects were examined on their health status within the framework of the Chernobyl Sasakawa Health and Medical Cooperation Project (CSHMCP) from 1991-1996. In view of the main findings of studies in CSHMCP were thyroid abnormalities, selection of subjects was conducted on the basis of the credible estimates of thyroid dose. Preference for subjects to be included into the cohort was defined by the availability of health examination data from previous study (1991-1996) and individual dosimetry, environmental and social data that may prove useful for reconstruction of individual dose. The primary data analyzed for subjects selection are measurements of iodine-131 in the thyroid in May-June 1986, questionnaire data on individual food habits and early measurements of radiocesium in the body of subjects made by RIRH from May to September 1986. Plausible analytical models were applied to calculate thyroid dose from available data. Previously worked out methods of thyroid dose reconstruction using early measurement data of radiocesium content in the body and questionnaire data on individual consumption of locally produced milk were reevaluated. Basing on these analytical procedures, the individual thyroid dose was ascribed to each member of the cohort. The

  4. Posttraumatic Temporomandibular Joint Disorders

    Giannakopoulos, Helen E.; Quinn, Peter D.; Granquist, Eric; Chou, Joli C.

    2009-01-01

    The temporomandibular joint (TMJ) has many essential functions. None of its components are exempt from injury. Facial asymmetry, malocclusion, disturbances in growth, osteoarthritis, and ankylosis can manifest as complications from trauma to the TMJ. The goals of initial treatment include achievement of pretraumatic function, restoration of facial symmetry, and resolution of pain. These same objectives hold true for late repairs and reconstruction of the TMJ apparatus. Treatment is demanding,...

  5. Joint ventures

    Sørensen, Karsten Engsig

    Afhandlingen analysere de konkurrenceretlige og selskabsretlige regler som er bestemmende for hvordan et joint venture samarbejde er struktureret......Afhandlingen analysere de konkurrenceretlige og selskabsretlige regler som er bestemmende for hvordan et joint venture samarbejde er struktureret...

  6. Joint Disorders

    A joint is where two or more bones come together, like the knee, hip, elbow, or shoulder. Joints can be damaged by many types of injuries or diseases, including Arthritis - inflammation of a joint. It causes pain, stiffness, and swelling. Over time, ...

  7. Coracoclavicular joint

    The coracoclvicular joint, a rear abnormality which may be the cause of pain in the shoulder and limitation of motion of the shoulder joint, is discussed. A case of coracoclvicular joint with shoulder pain was observed in 65 yrs old Korean male

  8. Experimental study on mechanical and biomechanical reconstruction of bone defect of long bone near joint%长骨近关节端骨缺损的力学和生物力学结构重建

    胡春明; 张伟; 苏云; 王成学; 徐莘香; 卢宝顺

    2005-01-01

    reconstruction methods.DESIGN: A completely randomized experiment with self-control and mutual control.SETTING: Laboratory for Experimental Animals, First Hospital of Jilin University.MATERIALS: Twelve healthy adult hybrid dogs, 5 males and 7 females weighing 12 to 18 kg, were recruited.METHODS: The bone defects near joints were established in upper femoral condyle in the 12 dogs, which were reconstructed by 3 operation styles: only filling with bone cement, filling with bone cement + autogenous ilium bone graft, and filling with bone cement + autogenous ilium bone graft + fixation with L-trapezoid compression plate. There was one dog in each method. The specimens were harvested at the end of weeks 3, 6, 12and 24, respectively, after operation. One week before specimens were harvested the fluorescent labeling was prepared; we conducted vascular perfusion of disulphine blue before the animals were executed.MAIN OUTCOME MEASURES: A series of examinations were carried out, including X-ray film, biomechanical test, intravascular perfusion and tetracycline fluorescent labeling. The bone healing, blood supply recovery and biomechanics were observed in the three groups.RESULTS: The 12 dogs all entered the result analysis. ① Results of Xray examination: Two cases of fracture occurred in experimental side at 6and 12 weeks in group Ⅰ; one case of fracture occurred in experimental side at 6 weeks in group Ⅱ. No fracture happened in group Ⅲ. ② Bone stiffness assayed with biomechanics: It decreased in experimental side as compared to control side by 67% and 70% in group Ⅰ; 66%, 76% and 46% in group Ⅱ; and 8% in group Ⅲ. ③ Specimen observation after operation: Bone formation, callus, and blood supply recovery were significantly better in group Ⅲ than in groups Ⅰ and Ⅱ at all stages.CONCLUSION: The third operation, filling with bone cement + autogenous ilium bone graft + fixation with L-trapezoid compression plate, is an ideal method of bone reconstruction. It can

  9. Transition joint

    A transition joint is disclosed for joining together tubular pieces formed respectively from a low alloy or carbon steel and a high temperature alloy composition having substantially different characteristics such as coefficient of thermal expansion, the transition joint including a plurality of tubular parts interconnected with each other by means of friction weld joints formed at an angle of 900 to the axis of the transition joint, the tubular parts at opposite ends of the transition joint being selected to facilitate in situ welding to the low alloy or carbon steel and high temperature alloy respectively. This friction welded transition joint can be used whenever different tubular pieces need to be joined together so that the joint can withstand high temperatures, for instance in heat exchangers and the such like. (Auth.)

  10. Two Different Approaches a Hip Joint Reconstruction

    Kytýř, Daniel; Vyčichl, Jan; Jírová, Jitka; Jíra, J.

    Kippen : Civil-comp. Press, 2008 - (Topping, B.; Papadrakakis, M.), s. 160-160 ISBN 978-1-905088-26-3. [International conference on Engineering computational technology /6./. Athens (GR), 02.09.2008-05.09.2008] R&D Projects: GA AV ČR(CZ) IAA200710504 Institutional research plan: CEZ:AV0Z20710524 Keywords : acetabulum * cement layer * contact stress analysis Subject RIV: FI - Traumatology, Orthopedics

  11. Distal radioulnar joint injuries.

    Thomas, Binu P; Sreekanth, Raveendran

    2012-09-01

    Distal radioulnar joint is a trochoid joint relatively new in evolution. Along with proximal radioulnar joint, forearm bones and interosseous membrane, it allows pronosupination and load transmission across the wrist. Injuries around distal radioulnar joint are not uncommon, and are usually associated with distal radius fractures,fractures of the ulnar styloid and with the eponymous Galeazzi or Essex_Lopresti fractures. The injury can be purely involving the soft tissue especially the triangular fibrocartilage or the radioulnar ligaments. The patients usually present with ulnar sided wrist pain, features of instability, or restriction of rotation. Difficulty in carrying loads in the hand is a major constraint for these patients. Thorough clinical examination to localize point of tenderness and appropriate provocative tests help in diagnosis. Radiology and MRI are extremely useful, while arthroscopy is the gold standard for evaluation. The treatment protocols are continuously evolving and range from conservative, arthroscopic to open surgical methods. Isolated dislocation are uncommon. Basal fractures of the ulnar styloid tend to make the joint unstable and may require operative intervention. Chronic instability requires reconstruction of the stabilizing ligaments to avoid onset of arthritis. Prosthetic replacement in arthritis is gaining acceptance in the management of arthritis. PMID:23162140

  12. Distal radioulnar joint injuries

    Binu P Thomas

    2012-01-01

    Full Text Available Distal radioulnar joint is a trochoid joint relatively new in evolution. Along with proximal radioulnar joint , forearm bones and interosseous membrane, it allows pronosupination and load transmission across the wrist. Injuries around distal radioulnar joint are not uncommon, and are usually associated with distal radius fractures,fractures of the ulnar styloid and with the eponymous Galeazzi or Essex_Lopresti fractures. The injury can be purely involving the soft tissue especially the triangular fibrocartilage or the radioulnar ligaments.The patients usually present with ulnar sided wrist pain, features of instability, or restriction of rotation. Difficulty in carrying loads in the hand is a major constraint for these patients. Thorough clinical examination to localize point of tenderness and appropriate provocative tests help in diagnosis. Radiology and MRI are extremely useful, while arthroscopy is the gold standard for evaluation. The treatment protocols are continuously evolving and range from conservative, arthroscopic to open surgical methods. Isolated dislocation are uncommon. Basal fractures of the ulnar styloid tend to make the joint unstable and may require operative intervention. Chronic instability requires reconstruction of the stabilizing ligaments to avoid onset of arthritis. Prosthetic replacement in arthritis is gaining acceptance in the management of arthritis.

  13. CT diagnosis in the elbow joint

    The normal anatomy of the elbow joint is described. Diverse pathologic joint alterations, e.g. fractures and dislocations, ostheochondritis, inflammatory changes, and ulnar nerve lesion are demonstrated. Particular attention is paid to threedimensional (3D-) reconstruction of demonstrable pathologic findings. (orig.)

  14. Posttraumatic temporomandibular joint disorders.

    Giannakopoulos, Helen E; Quinn, Peter D; Granquist, Eric; Chou, Joli C

    2009-05-01

    The temporomandibular joint (TMJ) has many essential functions. None of its components are exempt from injury. Facial asymmetry, malocclusion, disturbances in growth, osteoarthritis, and ankylosis can manifest as complications from trauma to the TMJ. The goals of initial treatment include achievement of pretraumatic function, restoration of facial symmetry, and resolution of pain. These same objectives hold true for late repairs and reconstruction of the TMJ apparatus. Treatment is demanding, and with opposing approaches. The following article explores various treatment options for problems presenting as a result of a history of trauma to the TMJ. PMID:22110802

  15. Penile reconstruction

    Garaffa, Giulio; Sansalone, Salvatore; Ralph, David J.

    2012-01-01

    During the most recent years, a variety of new techniques of penile reconstruction have been described in the literature. This paper focuses on the most recent advances in male genital reconstruction after trauma, excision of benign and malignant disease, in gender reassignment surgery and aphallia with emphasis on surgical technique, cosmetic and functional outcome.

  16. Penile reconstruction

    Giulio Garaffa; Salvatore Sansalone; David J Ralph

    2013-01-01

    During the most recent years,a variety of new techniques of penile reconstruction have been described in the literature.This paper focuses on the most recent advances in male genital reconstruction after trauma,excision of benign and malignant disease,in gender reassignment surgery and aphallia with emphasis on surgical technique,cosmetic and functional outcome.

  17. Anterior cruciate ligament reconstruction

    This paper determines the efficacy of MR imaging in evaluation of the anterior cruciate ligament (ACL) following reconstructive surgery. Forty-three MR examinations were performed in 33 patients who had undergone previous arthroscopic ACL reconstruction with patellar bone-tendon- bone autografts (postoperative period, 1-24 months; mean, 5.2 months). Of the 40 studies performed in clinically stable knees (30 patients), MR demonstrated a well-defined, signal void ACL graft in 36. Of the three studies performed in three patients with clinical ACL laxity or suspected tear, the neoligament was of intermediate definition in one and nondiscernible in the other two. As in the native knee, buckling of the PCL was suggestive of ACL insufficiency. Bone tunnel placement, patellar tendon changes, and joint effusions were also evaluated

  18. Joint pain

    ... or conditions. It may be linked to arthritis , bursitis , and muscle pain . No matter what causes it, ... Autoimmune diseases such as rheumatoid arthritis and lupus Bursitis Chondromalacia patellae Crystals in the joint: gout (especially ...

  19. Labral reconstruction: when to perform and how

    Brian J White

    2015-07-01

    Full Text Available Over the past decade, the understanding of the anatomy and function of the hip joint has continuously evolved, and surgical treatment options for the hip have significantly progressed. Originally, surgical treatment of the hip primarily involved resection of damaged tissue. Procedures that maintain and preserve proper hip anatomy, such as labral repair and femoroacetabular impingement (FAI correction, have shown superior results, in terms of pain reduction, increased function, and ability to return to activities. Labral reconstruction is a treatment option that uses a graft to reconstruct the native labrum. The technique and outcomes of labral reconstruction have been described relatively recently, and labral reconstruction is a cutting edge procedure that has shown promising early outcomes. The aim of this article is to review the current literature on hip labral reconstruction. We will review the indications for labral reconstruction, surgical technique and graft options, and surgical outcomes that have been described to date. Labral reconstruction provides an alternative treatment option for challenging intra-articular hip problems. Labral reconstruction restores the original anatomy of the hip and has the potential to preserve the longevity of the hip joint. This technique is an important tool in the orthopaedic surgeon’s arsenal for hip joint treatment and preservation.

  20. Climate Reconstructions

    National Oceanic and Atmospheric Administration, Department of Commerce — The NOAA Paleoclimatology Program archives reconstructions of past climatic conditions derived from paleoclimate proxies, in addition to the Program's large...

  1. Laryngopharyngeal reconstruction

    Kazi, Rehan A

    2006-01-01

    There is a high incidence of hypopharyngeal cancer is our country due to the habits of tobacco and alcohol. Moreover these cases are often detected in the late stages thereby making the issue of reconstruction very tedious and unpredictable. There are a number of options for laryngopharyngeal reconstruction available now including the use of microvascular flaps depending upon the patient’s fitness, motivation, technical expertise, size and extent of the defect. This article reviews the differ...

  2. Reconstrucción de la articulación temporomandibular postraumática con prótesis a medida: Planificación quirúrgica virtual Post-traumatic reconstruction with custom prosthesis of the temporomandibular joint: Computerized surgical planning

    Aitor García Sánchez

    2011-06-01

    Full Text Available Introducción: Las nuevas técnicas de planificación quirúrgica virtual, como la tecnología CAD/CAM, así como los avances en biomateriales, permiten abordar casos cada vez más complejos de reconstrucción de la articulación temporomandibular. La planificación y la fabricación de dispositivos aloplásticos a medida permiten una adaptación excelente a las estructuras anatómicas. Las deformidades dentofaciales coexisten en muchas ocasiones con la afección articular. Con estos métodos de planificación es posible asociar procedimientos de cirugía ortognática, a la vez que reconstruimos la articulación temporomandibular en un solo tiempo quirúrgico. Material y métodos: En este artículo presentamos nuestra experiencia en la planificación virtual y posterior cirugía de 3 casos de anquilosis articular bilateral (6 articulaciones, con simulación de osteotomías, movimientos maxilomandibulares y diseño de prótesis totales aloplásticas a medida de la articulación temporomandibular. Conclusiones: El abordaje integral de la biomecánica articular, la relación intermaxilar y la oclusión dental es imprescindible para obtener resultados predecibles y satisfactorios. La planificación virtual y la utilización de dispositivos aloplásticos a medida permiten la reconstrucción total articular de una forma precisa y segura.Introduction: New virtual surgery planning techniques like CAD/CAM and advances in biomaterials have made it possible to undertake increasingly complex cases of temporomandibular joint reconstruction. The planning and preparation of custom alloplastic devices makes it possible to accurately accommodate anatomic structures. Dental and facial deformities often coexist with articular pathology. Using computerized planning methods, orthognathic surgery procedures can be combined with temporomandibular joint reconstruction in a single procedure. Material and methods: The authors' experience with computerized planning and

  3. MRI based volumetric assessment of knee cartilage after ACL-reconstruction, correlated with qualitative morphologic changes in the joint and with clinical outcome. Is there evidence for early posttraumatic degeneration?; MRT-basierte Knorpelvolumetrie nach Kreuzbandersatzplastik in Korrelation mit qualitativen Gelenkveraenderungen und dem klinischen Outcome. Gibt es Hinweise auf fruehzeitige posttraumatische degenerative Veraenderungen?

    Arnoldi, A.P.; Weckbach, S.; Horng, A.; Reiser, M. [Ludwig-Maximilians-Univ. Muenchen (Germany). Dept. of Clinical Radiology; Nussbickel, C. [Klinikum Garmisch-Partenkirchen (Germany). Dept. of Internal Medicine; Noebauer, I. [Medizinische Universitaet Wien (Austria). Klinik fuer Radiodiagnostik; Zysk, S. [Orthopaedie Zentrum Groebenzell (Germany). Center of Orthopaedics; Glaser, C. [NYU Medical Center, New York, NY (United States). Dept. of Radiology

    2011-12-15

    Purpose: The purpose of this study was to analyze potential quantitative and qualitative changes of the knee cartilage and joint indicative of early posttraumatic OA 4 years after ACL-reconstruction and to correlate the MRI-findings with the clinical outcome (CO). Materials and Methods: 1.5 T MRI-scans were performed on 9 patients post-op and 4 years later. Using a high-resolution T 1-w-fs-FLASH-3D-sequence cartilage volume (cVol) and thickness (mTh) were quantified. Using standard PD-w fs and T 1-w sequences qualitative changes of the joint structures were analyzed based on the WORMS-score. CO was rated by an orthopaedic surgeon using Lysholm-score, OAK-score, Tegner-activity-score (TAS), and Arthrometer KT-1000 testing. Results: Mean changes of cVol were -1.8 % (range: -5.9 %; + 0.7 %) and of mTh -0.8 % (range: -3.0 %; + 1.1 %). No significant change (95 %-CI) could be identified for any compartment. Three patients developed new peripatellar ostheophytes, acute trauma related changes mostly decreased. Mean outcome of Lysholm-score and OAK-score were 90 pts and 86 pts, mean TAS was 4.3 pts. Average maximum tibial translation reached 5.2 mm comparing to 6.7 mm on the healthy contralateral side. Conclusion: Despite a tendency towards decreased cVol and mTh 4 years after ACL-reconstruction qMRI revealed no significant cartilage loss. Newly developing osteophytes did not match with the observed good CO. This small pilot study motivates future quantitative and qualitative-structural MRI-based assessment of articular cartilage and other joint structures in order to improve diagnostic tools for the detection of early OA. (orig.)

  4. 锁骨钩钢板治疗Rockwood Ⅲ型肩锁关节脱位的治疗分析%Study of treatment of Rockwood type Ⅲ acromioclavicular dislocation with Hook plate

    郭丹; 周海斌

    2012-01-01

    [Objective] To analyze shoulder pain and restricted movement after treatment with Hook plate about Rockwood type HI acromioclavicular dislocation patients. [Method] From February ,2008 to February,2011,35 Rockwood type Ⅲ acromioclavicular dislocation patients (23 male and 12 female,average age 42.4) were treated in our hospital. They were treated with Hook plate. Adjusted Constant-Murley score was used to evaluate shoulder function. The Average follow-up time were 13.5 months. [Result]In Rockwood type Ⅲ acromioclavicular dislocation,there were 11 cases with different grade shoulder pain and restricted movement in the 19 patients. The score difference was significant ( P < 0.05 ). [ Conclusion ] Rockwood type Ⅲ acromioclavicular dislocation,treated with Hook plate leads to high rate of shoulder pain and restricted movement,which is not beneficial to functional rehabilitation.%[目的]探讨Rockwood Ⅲ型肩锁关节脱位行锁骨钩钢板手术治疗后肩关节疼痛、活动受限的原因.[方法]苏北人民医院和苏州大学附属第二医院自2008年2月~2011年2月共35例Rockwood Ⅲ型肩锁关节脱位病人,无骨折、神经损伤及血管损伤等其他合并伤,其中,男23例,女12例,平均42.4岁,行锁骨钩钢板手术治疗,术后按调整的Constant-Murley随访观察各病例肩关节恢复情况,平均随访13.5个月.[结果]35例Rockwood Ⅲ型肩锁关节脱位行锁骨钩钢板手术治疗中,有11例出现不同程度的肩关节肩痛、活动受限的症状,统计检验无肩痛、活动受限症状病例与有肩痛、活动受限症状病例之间评分差异有统计学意义(P<0.05).[结论]Rockwood Ⅲ型肩锁关节脱位行锁骨钩钢板手术治疗术后易出现肩痛、活动受限的症状,会明显影响肩关节功能恢复.

  5. Joint imaging

    Joint imaging is a proven diagnostic procedure which has become indispensable to the detection and treatment of different joint diseases in almost all disciplines. The method is suited for early diagnosis of joint affections both in soft tissue and bone which cannot be detected by X-ray or other procedures. The local activity accumulation depends on the rate of metabolism and is visualized in the scan, which in turn enables the extension and floridity of focal lesions to be evaluated and followed-up. Although joint scans may often give hints to probabilities relevant to differential diagnosis, the method is non-specific and only useful if based on the underlying clinical picture and X-ray finding, if possible. The radiation exposure is very low and does not represent a hazard in cases of adequate assessment of indication. In pregnant women and children the assessment of indication has to be based on very strict principles. The method is suited for out-patient diagnosis and can be applied in all installations equipped with a gamma camera and a technetium generator. (orig.)

  6. Project Reconstruct.

    Helisek, Harriet; Pratt, Donald

    1994-01-01

    Presents a project in which students monitor their use of trash, input and analyze information via a database and computerized graphs, and "reconstruct" extinct or endangered animals from recyclable materials. The activity was done with second-grade students over a period of three to four weeks. (PR)

  7. Vaginal reconstruction

    Lesavoy, M.A.

    1985-05-01

    Vaginal reconstruction can be an uncomplicated and straightforward procedure when attention to detail is maintained. The Abbe-McIndoe procedure of lining the neovaginal canal with split-thickness skin grafts has become standard. The use of the inflatable Heyer-Schulte vaginal stent provides comfort to the patient and ease to the surgeon in maintaining approximation of the skin graft. For large vaginal and perineal defects, myocutaneous flaps such as the gracilis island have been extremely useful for correction of radiation-damaged tissue of the perineum or for the reconstruction of large ablative defects. Minimal morbidity and scarring ensue because the donor site can be closed primarily. With all vaginal reconstruction, a compliant patient is a necessity. The patient must wear a vaginal obturator for a minimum of 3 to 6 months postoperatively and is encouraged to use intercourse as an excellent obturator. In general, vaginal reconstruction can be an extremely gratifying procedure for both the functional and emotional well-being of patients.

  8. Vaginal reconstruction

    Vaginal reconstruction can be an uncomplicated and straightforward procedure when attention to detail is maintained. The Abbe-McIndoe procedure of lining the neovaginal canal with split-thickness skin grafts has become standard. The use of the inflatable Heyer-Schulte vaginal stent provides comfort to the patient and ease to the surgeon in maintaining approximation of the skin graft. For large vaginal and perineal defects, myocutaneous flaps such as the gracilis island have been extremely useful for correction of radiation-damaged tissue of the perineum or for the reconstruction of large ablative defects. Minimal morbidity and scarring ensue because the donor site can be closed primarily. With all vaginal reconstruction, a compliant patient is a necessity. The patient must wear a vaginal obturator for a minimum of 3 to 6 months postoperatively and is encouraged to use intercourse as an excellent obturator. In general, vaginal reconstruction can be an extremely gratifying procedure for both the functional and emotional well-being of patients

  9. Observation of the clinical effect of the occlusal reconstruction treatment on patients with temporomandibular joint disorder as well as severe dental abrasion%牙列重度磨耗伴颞下颌关节紊乱病咬合重建序列治疗临床疗效观察

    黄静莲; 曹云娟

    2012-01-01

    目的 观察分析牙列重度磨耗伴颞下颌关节紊乱病(TMD)患者咬合重建序列治疗的疗效.方法 选取牙列重度磨耗伴TMD患者11例,检查记录TMD及其相关症状,然后进行咬合重建序列治疗,治疗完成3个月、6个月及12个月后,将治疗后的TMD及其相关症状与治疗前相比较,对相关数据进行统计分析.结果 治疗后11例患者均感满意且咀嚼有力,关节弹响、关节疼痛及咬合干扰治疗前后的比较存在统计学意义(P<0.05).结论 咬合重建后,患者满意度较高,其TMD症状有明显改善,髁突位置在短期内无明显改善.%Objective Observe and analyse the clinical effect of the occlusal reconstruction treatment on patients with temporomandibular joint disorder(TMD) as well as severe dental abrasion. Methods 11 patients with TMD and severe abrasion were given occlusal reconstruction treatment after records of their situation of TMD and related symptoms. 3,6,12 months after operation,compare TMD and related symptorms with those before operation. Data were analysed statistically. Kelusts 11 patients given the treatment were all satisfied with the correct and effective occlusion. There were significantly statistical differences (P <0.05) in the comparison before and after the treatment in joint-snapping,joint-paining and occlusal interference. Conclusions Patients are highly satisfied after occlusal reconstruction , and their symptoms about TMD improve obviously. There was no variation of the mandibular condyle position in short time.

  10. ACL reconstruction - discharge

    Anterior cruciate ligament reconstruction - discharge; ACL reconstruction - discharge ... had surgery to reconstruct your anterior cruciate ligament (ACL). The surgeon drilled holes in the bones of ...

  11. Joint purpose?

    Pristed Nielsen, Helene

    2013-01-01

    Starting from Crenshaw´s point that antiracism often fails to interrogate patriarchy and that feminism often reproduces racist practices (1991: 1252), this paper asks: What are the theoretical reasons for believing that feminism and anti-racism can be regarded as fighting for the joint purpose of...... anti-discrimination in Europe today? And what empirical evidence may be found for such a joint approach? The paper discusses how the contemporary EU context differs from the American context which prompted Crenshaw to raise the point about intersectionality, and it analyses documents and interviews...... from each of the two European umbrella organisations the European Women´s Lobby and the European Network against Racism, as well as a number of their national member organisations from across Europe, both within EU and non-EU member states....

  12. Application Value of MR and CT in the Diagnosis and Treatment and Re-construction of Injury of Cruciate Ligament of Knee Joint%MR与CT在膝关节交叉韧带损伤诊治重建的应用价值

    门方禹

    2016-01-01

    目的 探究膝关节交叉韧带损伤诊治重建中MR与CT的应用价值. 方法 整群选取并回顾性分析2014年6月—2015年6月在该院收治的98例膝关节交叉韧带损伤患者临床资料,按诊治所用不同检查方法分为两组,观察组54例患者行MR诊治与重建, 对照组44例患者行CT诊治与重建, 比较两组ACL与PCL测量值. 结果 观察组ACL 的前内侧束长度(41.1±1.6)mm、后外侧束长度(16.6±1.6)mm、宽度(10.1±0.6)mm、厚度(5.8±0.6)mm 与对照组(40.6±1.5)mm、(16.3±1.4)mm、(9.8±0.9)mm、(5.6±0.9)mm比较差异无统计学意义(P>0.05),但观察组测量值略微优于对照组.结论 MR与CT在膝关节交叉韧带损伤诊治重建中均具较高的应用价值,但MR诊治重建效果略优于CT,两种检查检查技术均值得推广使用.%Objective To study the application value of MR and CT in the diagnosis and treatment and reconstruction of in-jury of cruciate ligament of knee joint. Methods The clinical materials of 98 cases of patients with injury of cruciate liga-ment of knee joint treated in our hospital from June 2014 to June 2015 were retrospectively analyzed and divided into two groups according to different diagnostic and treatment examination methods, the observation group (55 cases ) received MR diagnosis and treatment and reconstruction, the control group (44 cases ) received CT diagnosis and treatment and recon-struction, the measured values of ACL and PCL of the two groups were compared. Results The anterior medial bundle length of ACL, lateral bundle length of ACL, width and thickness were respectively (41.1±1.6)mm, (16.6±1.6)mm, (10.1± 0.6)mm and (5.8±0.6)mm in the observation and (40.6±1.5)mm, (16.3±1.4)mm, (9.8±0.9)mm and (5.6±0.9))mm in the control group, the comparison was not statistically significant (P>0.05), however, the measured value in the observation group was slightly better than that in the control group. Conclusion MR and CT in the diagnosis and

  13. MSCT reconstruction technique combined with fat suppression MR value in the diagnosis of occult fracture of knee joint%MSCT重建技术联合MR脂肪抑制技术在膝关节隐匿性骨折中的诊断价值

    赵星; 郭满涛

    2014-01-01

    Objective To evaluate multislice spiral CT (MSCT) multi planar reconstruction (MPR) and volume rendering (VR) reconstruction technique combined with magnetic resonance (MR) fat suppression value techniques in diagnosis of occult fracture of knee joint. Methods: review of 20 knee injury of knee joint and lateral X ray examination after, think no traumatic fracture patients, clinical suspected fracture patients, then underwent 16 slice spiral CT scan with 16 slice spiral CT, derived from the original data by the workstation for multi planar reformation (MPR) and volume rendering (VR) reconstruction images combined with axial images of fracture diagnosis, fol owed by MR examination and evaluation damage. Results of the 20 patients after MSCT reconstruction, 14 cases of CT and MR in patients with diagnosis of knee joint bone fracture with occult fracture; 2 cases of patients with MR diagnosis of local bone occult fracture, while CT and recombinant image not found the exact fracture line; conclusions MSCT in determining the fracture location was superior to X-ray and MR, MR no cortical bone fracture in the diagnosis of occult fracture is superior to CT, and MR in the diagnosis of ligament, meniscus injury and soft tissue injury and is superior to X-ray, CT scan and reconstruction.%目的:探讨多层螺旋CT(MSCT)多平面重组(MPR)及容积再现(VR)重建技术联合磁共振(MR)脂肪抑制技术在膝关节隐匿性骨折中的诊断价值。方法回顾20位膝关节外伤行膝关节正侧位X线检查后,认为无外伤性骨折的患者,临床高度怀疑骨折患者,再行16层螺旋C T平扫的患者,将16层螺旋CT所得原始数据经工作站进行多平面重组(MPR)及容积再现(VR)重建图像结合轴位图像做出对骨折的诊断,后行MR检查评价损伤状况。结果20例患者中经MSCT重建后,14例患者CT及MR骨折诊断出膝关节组成骨有隐匿性骨折;2例患者MR诊断出局部骨质隐

  14. Radio Reconstructions

    Bulley, James; Jones, Daniel

    2013-01-01

    Radio Reconstructions is a sound installation which use indeterminate radio broadcasts as its raw material. Each piece is structured by a notated score, which controls its rhythm, dynamics and melodic contour over time. The audio elements used to enact this score are selected in real-time from unknown radio transmissions, by an autonomous software system which is continuously scanning the radio waves in search of similar fragments of audio. Using a technique known as audio mosaicing, hund...

  15. Parallel MRI Reconstruction by Convex Optimization

    Zhang, Cishen

    2014-01-01

    In parallel magnetic resonance imaging (pMRI), to find a joint solution for the image and coil sensitivity functions is a nonlinear and nonconvex problem. A class of algorithms reconstruct sensitivity encoded images of the coils first followed by the magnitude only image reconstruction, e.g. GRAPPA. It is shown in this paper that, if only the magnitude image is reconstructed, there exists a convex solution space for the magnitude image and sensitivity encoded images. This solution space enables formulation of a regularized convex optimization problem and leads to a globally optimal and unique solution for the magnitude image reconstruction. Its applications to in-vivo MRI data sets result in superior reconstruction performance compared with other algorithms.

  16. Compare of 3 different types of closed reduction and internal fixation for the fresh complete acromioclavicular dislocation%3种闭合复位内固定法治疗新鲜肩锁关节全脱位的疗效比较

    聂伟志; 谭远超; 杨茂清; 朱惠芳

    2011-01-01

    目的:比较3种闭合复位内固定法治疗新鲜肩锁关节全脱住的疗效.方法:136例新鲜肩锁关节全脱位患者,闭合复位后采用经皮"肩峰-锁骨"双枚钢针固定治疗31例(A组),采用经皮"肩峰-锁骨"双枚钢针固定+经皮缝合肩锁关节囊治疗45例(B组),采用经皮"肩峰一锁骨"双枚钢针固定+经皮"锁骨一喙突"空心螺钉固定+经皮缝合肩锁关节囊治疗60例(c组,"三联固定"组),参照Karlsson评价标准比较3组疗效.结果:3组疗效之间的差异有统计学意义(x2=21.623,P=0.002),C组疗效优于B组(u=2.014,P=0.002),B组疗效优于A组(u=2.781,P=0.006).结论:经皮"肩峰-锁骨"双枚钢针固定+经皮"锁骨-喙突"空心螺钉固定+经皮缝合肩锁关节囊治疗新鲜肩锁关节全脱位,疗效优于经皮"肩峰-锁骨"钢针固定+经皮缝合肩锁关节囊,更优于单纯"肩峰-锁骨"钢针固定.%Objective: To compare the curative effect of 3 different types of closed reduction and internal fixation on fresh complete acromioclavicular dislocation. Methods: 136 patients sustained complete acromioclavicular dislocation were divided into 3 groups. 31 cases in Group A were treated with acromioclavicular closed reduction and acromioclavicular internal fixation by 2 steel - wire per cutem. 45 cases in Group B were treated with acromioclavicular closed reduction and acromioclavicular internal fixation by 2 steel - wire per cutem and suturation of the capsula articularis acromioclavicularis per cutem. 60 cases in Group C were treated with acromioclavicular closed reduction and acromioclavicular internal fixation by 2 steel - wire per cutem and suturation of the capsula articularis acromioclavicularis per cutem and fixation with a hollowed screw between the clavicle and the coracoid (three point fixation). The curative effects were evaluated according to Karlsson' s standard. Results: There was statistical difference in the curative effects between the 3 groups(x2 = 21. 623

  17. Tracheal reconstructions.

    Srikrishna, S V; Shekar, P S; Shetty, N

    1998-12-01

    Surgical reconstruction of the trachea is a relatively complex procedure. We had 20 cases of tracheal stenosis. We have a modest experience of 16 tracheal reconstructions for acquired tracheal stenosis. Two patients underwent laser treatment while another two died before any intervention. The majority of these cases were a result of prolonged ventilation (14 cases), following organophosphorous poisoning (11 cases), Guillain-Barré syndrome, bullet injury, fat embolism and surprisingly only one tumor, a case of mucoepidermoid carcinoma, who had a very unusual presentation. There were 12 males and 4 females in this series, age ranging from 12-35 years. The duration of ventilation ranged from 1-21 days and the interval from decannulation to development of stridor was between 5-34 days. Six of them were approached by the cervical route, 5 by thoracotomy and cervical approach, 2 via median sternotomy and 3 by thoracotomy alone. Five of them required an additional laryngeal drop and 1 required pericardiotomy and release of pulmonary veins to gain additional length. The excised segments of trachea measured 3 to 5 cms in length. All were end to end anastomosis with interrupted Vicryl sutures. We have had no experience with stents or prosthetic tubes. Three patients developed anastomotic leaks which were controlled conservatively. Almost all of them required postoperative tracheo-bronchial suctioning with fibreoptic bronchoscope. We had one death in this series due to sepsis. PMID:9914459

  18. NEW VISUAL METHOD FOR FREE-FORM SURFACE RECONSTRUCTION

    2002-01-01

    A new method is put forward combining computer vision with computer aided geometric design (CAGD) to resolve the problem of free-form surface reconstruction. The surface is first subdivided into N-sided Gregory patches, and a stereo algorithm is used to reconstruct the boundary curves. Then, the cross boundary tangent vectors are computed through reflectance analysis. At last, the whole surface can be reconstructed jointing these patches with G1 continuity(tangent continuity). Examples on synthetic images are given.

  19. Motor evoked potentials and spontaneous electromyography in reconstruction of pelvic fracture combined with sacroiliac joint dislocation%骨盆骨折合并骶髂关节脱位术中电生理监测技术的应用

    陈艺; 林志雄; 黎文; 刘琦; 严广斌; 张姝江; 余楠生

    2013-01-01

    目的 探讨骨盆骨折合并骶髂关节脱位手术中应用电生理监测技术预防神经损伤的效果.方法 对需要手术治疗的骨盆骨折合并骶髂关节脱位患者,术中对术侧采用经颅电刺激运动诱发电位(TES-MEP)和自由肌电图(EMG)进行实时监测,观察其对坐骨神经和腰5神经根医源性损伤的预防效果.结果 骶髂关节复位固定时,术侧股二头肌、胫前肌、胫后肌MEP波幅下降,但波形均能引出.耻骨复位时,MEP波形稳定.因手术操作引发趾短伸肌、胫后肌短暂、高幅EMG反应,即刻提醒术者,避免频繁,粗暴骚扰神经组织.术后骶髂关节、耻骨复位良好,且未出现医源性神经损伤.结论 联合运用MEP和自由EMG实时监测能及时反映骨盆骨折合并骶髂关节脱位切开复位内固定术中坐骨神经及L5神经根受激惹情况和运动功能状态,提高手术精确性,值得在临床推广应用.%Objective To investigate the efficacy of nerve damage prevention using electrophysiological monitoring techniques during reconstruction of pelvic fracture combined with sacroiliac joint dislocation. Methods Intraoperative real-time monitoring by motor evoked potentials with trans-cranial electrical stimulation (TES-MEP) and spontaneous electromyogram (EMG) were performed during surgical treatment for the patient of pelvic fracture combined with sacroiliac joint dislocation. The preventive effects on iatrogenic injury of sciatic nerve and L5 nerve root were observed. Results The TES-MEP volatility of biceps femoris, tibialis anterior muscle and posterior tibial muscle dropped on the surgical side when resetting sacroiliac joint, but the waveform could be elicited. The TES-MEP waveform was stable when resetting pubis. Some short, high-amplitude EMG response appeared in extensor digitorum brevis and posterior tibial muscle due to surgical operation, so that the surgeons could be immediately aware of avoiding irritation for nerve tissues

  20. 基于美学修复目的咬合重建对颞下颌关节的影响%The effects of occlusal reconstruction of esthetic prosthetic to TemporoMandibular Joint

    曹利; 越涑霞

    2012-01-01

    目的:探讨以美容为目的的固定修复治疗所形成的咬合重建对颞下颌关节可能产生的影响.方法:通过固定修复、咬合重建的方法对牙列不齐、面下1/3垂直距离较短的患者,按下颌息止颌位时的面下1/3垂直距离减去2- 3mm确定下颌位置并以此为标准进行修复治疗,使患者实现正常的面容及咬合形态,同时观察颞下颌关节(TMJ)的结构和功能的变化.结果:3例前牙超覆(牙合)、超覆盖,面下1/3垂直距离偏短的患者进行咬合重建,均恢复了正常的咬合形态,改善了咀嚼功能和容貌,同时1例伴有TMJ症状的患者TMJ症状消失.结论:对面下1/3垂直距离不足的咬合畸形患者恢复正常的咬合形态及面下1/3垂直距离,在改善容貌和咬合功能的同时,也去除了TMD的易感(occlusion)因素,对于缓解或解除TMD症状有良好的效果.%Objective To investigate the effects to the TMJ of patients who had malocclusion were treated occlusal reconstruction of esthetic prosthodontics. Methods Three patients, were crowded malalinment, Ⅱ were whole dental cross bite, Ⅲ were Angle Ⅱ malocclusion who had deep over bite,deep over jet.maxillary forward,mandibular retraction, decrease of vertical dimension and symptoms of TMD.Patients I and Ⅱ were alined teeth by fixed ceramic crowns,not changed mandibular position. Patient III were mowed mandible forward and downward according to the mandibular postural position and got occlusal reconstruction by fixed ceramic crowns. Results Three patients who had esthetic occlusal reconstruction rehabilitated normal articulation and improved masticatory movement and face.Symptoms of TMD of patient Ⅲ disappeared. Conclusion When patients of malocclusion were treated occlusal reconstruction of esthetic prosthodontics,the occlusal factors of TMD were removed and symptoms TMD eliminated.

  1. Knee joint replacement

    Knee joint replacement is a surgery to replace a knee joint with a man-made joint. The artificial joint is called a prosthesis . ... cartilage and bone are removed from the knee joint. Man-made pieces are then placed in the ...

  2. Reliability of Tubular Joints

    Sørensen, John Dalsgaard; Thoft-Christensen, Palle

    In this paper the preliminary results obtained by tests on tubular joints are presented. The joints are T-joints and the loading is static. It is the intention in continuation of these tests to perform tests on other types of joints (e.g. Y-joints) and also with dynamic loading. The purpose of th...

  3. Joint Replacement Surgery

    ... a Clinical Trial Journal Articles Arthritis July 2014 Joint Replacement Surgery: Health Information Basics for You and Your Family What Is Joint Replacement Surgery? Joint replacement surgery is removing a ...

  4. Joint x-ray

    X-ray - joint; Arthrography; Arthrogram ... x-ray technologist will help you position the joint to be x-rayed on the table. Once in place, pictures are taken. The joint may be moved into other positions for more ...

  5. Joint instability and osteoarthritis.

    Blalock, Darryl; Miller, Andrew; Tilley, Michael; Wang, Jinxi

    2015-01-01

    Joint instability creates a clinical and economic burden in the health care system. Injuries and disorders that directly damage the joint structure or lead to joint instability are highly associated with osteoarthritis (OA). Thus, understanding the physiology of joint stability and the mechanisms of joint instability-induced OA is of clinical significance. The first section of this review discusses the structure and function of major joint tissues, including periarticular muscles, which play a significant role in joint stability. Because the knee, ankle, and shoulder joints demonstrate a high incidence of ligament injury and joint instability, the second section summarizes the mechanisms of ligament injury-associated joint instability of these joints. The final section highlights the recent advances in the understanding of the mechanical and biological mechanisms of joint instability-induced OA. These advances may lead to new opportunities for clinical intervention in the prevention and early treatment of OA. PMID:25741184

  6. Thresholding-based reconstruction of compressed correlated signals

    Fawzi, Alhussein; Frossard, Pascal

    2011-01-01

    We consider the problem of recovering a set of correlated signals (e.g., images from different viewpoints) from a few linear measurements per signal. We assume that each sensor in a network acquires a compressed signal in the form of linear measurements and sends it to a joint decoder for reconstruction. We propose a novel joint reconstruction algorithm that exploits correlation among underlying signals. Our correlation model considers geometrical transformations between the supports of the different signals. The proposed joint decoder estimates the correlation and reconstructs the signals using a simple thresholding algorithm. We give both theoretical and experimental evidence to show that our method largely outperforms independent decoding in terms of support recovery and reconstruction quality.

  7. A comparison of two treatments of Rockwood type Ⅲ acromioclavicular dislocation%Rockwood Ⅲ型肩锁关节脱位两种治疗方法分析

    郭丹; 周海斌

    2013-01-01

    目的 探讨Rockwood Ⅲ型肩锁关节脱位手术及保守两种方法治疗后效果及对肩关节功能恢复的影响.方法 苏北人民医院和苏州大学附属第二医院骨科自2008年2月-2010年2月66例Rockwood Ⅲ型肩锁关节脱位病人,其中女性29例,男性37例,平均41.6岁,分锁骨钩钢板手术治疗和背带式锁骨固定带保守治疗,按调整的Constant-Murley评分系统随访观察各病例肩关节恢复情况.结果 Rockwood Ⅲ型肩锁关节脱位中,35例锁骨钩钢板手术治疗病例中3例出现肩关节活动受限、肩痛症状,背带式锁骨固定带保守治疗组31例病人中3例出现肩关节活动受限、肩痛症状,统计检验手术治疗组与保守治疗组之间评分差异无统计学意义(P>0.05).结论 Rockwood Ⅲ型肩锁关节脱位手术治疗与保守治疗对功能恢复影响差异不明显.%Objective To evaluate two treatment methods in Rockwood type Ⅲ acromioclavicular dislocation patients,and to evaluate the influence of trement methods on shoulder function. Methods From February,2008 to February,2010,66 Rockwood type Ⅲ acromioclavicular dislocation patients( 37 male and 29 female,average age 41. 6 )were treated in the Northern Jiangsu People' s Hospital and the Second Affiliated Hospital of Soochow University, with operation used hook plate and conservative treatment by clavicle sling immobilization respectively. Adjusted Constant-Murley Scale was used to evaluate shoulder function. Results In Rockwood type Ⅲ acromioclavicular dislocation. There were 3 cases with shoulder painful and restricted symptoms in the 35 patients treated with operation. There were 3 cases with shoulder painful and restricted symptoms in the 31 patients treated with conservative treatment patients. The difference between operation and conservative treatment was not significant P >0.05 ). Conclusion In Rockwood type Ⅲ acromioclavicular dislocation,for operation and conservative treatment,we could not

  8. Breast Reconstruction and Prosthesis

    ... have breast reconstruction If you choose to have reconstructive surgery, follow these steps: STEP 1 — Ask your doctor to refer you to a plastic surgeon who is an expert in breast reconstruction. ...

  9. The Arthroscopic Superior Capsular Reconstruction.

    Adams, Christopher R; Denard, Patrick J; Brady, Paul C; Hartzler, Robert U; Burkhart, Stephen S

    2016-01-01

    In a subset of patients with rotator cuff tears, the glenohumeral joint has minimal degenerative changes and the rotator cuff tendon is either irreparable or very poor quality and unlikely to heal. Reverse shoulder arthroplasty (RSA) is often considered for these patients despite the lack of glenohumeral arthritis. However, due to the permanent destruction of the glenohumeral articular surfaces, complication rates, and concerns about implant longevity with RSA, we believe the superior capsular reconstruction (SCR) is a viable alternative. In this article, we describe our technique for the SCR. PMID:27552457

  10. Spacesuit mobility knee joints

    Vykukal, H. C. (Inventor)

    1979-01-01

    Pressure suit mobility joints are for use in interconnecting adjacent segments of an hermetically sealed spacesuit in which low torques, low leakage and a high degree of reliability are required. Each of the joints is a special purpose joint characterized by substantially constant volume and low torque characteristics and includes linkages which restrain the joint from longitudinal distension and includes a flexible, substantially impermeable diaphragm of tubular configuration spanning the distance between pivotally supported annuli. The diaphragms of selected joints include rolling convolutions for balancing the joints, while various joints include wedge-shaped sections which enhance the range of motion for the joints.

  11. Avaliação isocinética de 18 pacientes do sexo masculino submetidos à correção cirúrgica da luxação acromioclavicular aguda com seguimento mínimo de dois anos Isokinetic evaluation of eighteen male patients submitted to surgical corretion of acute acromioclavicular luxation with a minimum two-year follow-up

    Flavio Almeida Salles; Américo Zoppi Filho

    2002-01-01

    Foram estudados 18 pacientes submetidos ao tratamento cirúrgico de luxação acromioclavicular aguda do grau III da classificação de ALLMAN-TOSSY, todos do sexo masculino com idade média de 36 anos, foram avaliados sob o ponto de vista isocinético com tempo de evolução variando de 24 até 127 meses. A avaliação isocinética foi realizada através de um dinamômetro computadorizado marca CYBEX® modelo 6000 na velocidade angular de 60º/segundo e demonstrou resultados significantes no movimento de abd...

  12. Estudio e intervencionismo ecoguiado de la articulación del hombro Ultrasound-assisted and interventionism study of shoulder joint

    D. Benítez Pareja

    2012-10-01

    Full Text Available El hombro doloroso es una entidad que encontramos en nuestra práctica diaria con relativa frecuencia. Con la introducción de la ultrasonografía, se abre un campo novedoso ya que podemos explorar, localizar e infiltrar exactamente la zona lesionada. La ecografía permite una exploración en la misma consulta, así como la capacidad de realizar una exploración dinámica. El hombro se compone de 5 articulaciones: 3 verdaderas (esternoclavicular, acromioclavicular y glenohumeral y 2 denominadas falsas (subacromial y escapulotorácica. Siempre que sea posible, intentaremos realizar la punción en plano, intentando visualizar el trayecto completo de la aguja y la punta de la misma. En el intervencionismo del hombro esto es bastante fácil de conseguir puesto que se trata de estructuras muy superficiales. Es muy poco probable que se produzcan daños graves durante la infiltración del hombro. Tendremos especial cuidado de no puncionar estructuras vasculares.Painful shoulder is an entity that we find in our daily practice with relative frequency. With the introduction of ultrasound, opens a new field that we can explore, locate and exactly infiltrate the injured area. Ultrasound allows an exploration in the same act, as well as the ability to make a dynamic scanning. The shoulder is made up of 5 joint: true 3 (sternoclavicular, acromioclavicular and glenohumeral and 2 known as false (subacromial and thoracic scapula. Wherever possible, we will try to puncture in plane, trying to display the full path of the needle and the tip of it. In the interventionism of the shoulder, this is quite easy to get since it's very superficial structures. It is highly unlikely any serious damage during the infiltration of the shoulder. Take special care of non piercing vascular structures.

  13. Joint fluid Gram stain

    Gram stain of joint fluid ... A sample of joint fluid is needed. The fluid sample is sent to a lab where a small drop is placed in a ... on how to prepare for the removal of joint fluid, see joint fluid aspiration .

  14. Butt Joint Tool Commissioning

    Martovetsky, N N

    2007-12-06

    ITER Central Solenoid uses butt joints for connecting the pancakes in the CS module. The principles of the butt joining of the CICC were developed by the JAPT during CSMC project. The difference between the CSMC butt joint and the CS butt joint is that the CS butt joint is an in-line joint, while the CSMC is a double joint through a hairpin jumper. The CS butt joint has to carry the hoop load. The straight length of the joint is only 320 mm, and the vacuum chamber around the joint has to have a split in the clamp shell. These requirements are challenging. Fig.1 presents a CSMC joint, and Fig.2 shows a CS butt joint. The butt joint procedure was verified and demonstrated. The tool is capable of achieving all specified parameters. The vacuum in the end was a little higher than the target, which is not critical and readily correctable. We consider, tentatively that the procedure is established. Unexpectedly, we discover significant temperature nonuniformity in the joint cross section, which is not formally a violation of the specs, but is a point of concern. All testing parameters are recorded for QA purposes. We plan to modify the butt joining tool to improve its convenience of operation and provide all features necessary for production of butt joints by qualified personnel.

  15. A Convex Optimization Approach to pMRI Reconstruction

    Zhang, Cishen

    2013-01-01

    In parallel magnetic resonance imaging (pMRI) reconstruction without using estimation of coil sensitivity functions, one group of algorithms reconstruct sensitivity encoded images of the coils first followed by the magnitude only image reconstruction, e.g. GRAPPA, and another group of algorithms jointly compute the image and sensitivity functions by regularized optimization which is a non-convex problem with local only solutions. For the magnitude only image reconstruction, this paper derives a reconstruction formulation, which is linear in the magnitude image, and an associated convex hull in the solution space of the formulated equation containing the magnitude of the image. As a result, the magnitude only image reconstruction for pMRI is formulated into a two-step convex optimization problem, which has a globally optimal solution. An algorithm based on split-bregman and nuclear norm regularized optimizations is proposed to implement the two-step convex optimization and its applications to phantom and in-vi...

  16. Ankle reconstruction in type II fibular hemimelia

    El-Tayeby, Hazem Mossad; Ahmed, Amin Abdel Razek Youssef

    2012-01-01

    Ankle reconstruction prior to limb lengthening for was performed in 13 patients with fibular hemimelia with complete radiological absence of the fibula (type II). There were different degrees of absence of metatarsal rays. The hindfoot deformity was a heel valgus in 12 patients and equinovarus in 1 patient. The patients’ ages ranged from 9 to 26 months. Excision of the fibular anlage was performed with lateral subtalar and ankle soft tissue releases to restore the ankle and subtalar joint rel...

  17. Culture - joint fluid

    Joint fluid culture ... fungi, or viruses grow. This is called a culture. If these germs are detected, other tests may ... is no special preparation needed for the lab culture. How to prepare for the removal of joint ...

  18. Temporomandibular Joint Dysfunction

    The temporomandibular joint (TMJ) connects your jaw to the side of your head. When it works well, it enables you to ... For people with TMJ dysfunction, problems with the joint and muscles around it may cause Pain that ...

  19. Knee joint replacement - slideshow

    ... this page: //medlineplus.gov/ency/presentations/100088.htm Knee joint replacement - series To use the sharing features ... 4 out of 4 Normal anatomy Overview The knee is a complex joint. It contains the distal ...

  20. Shoulder Joint Replacement

    ... en because of implant loosening, wear, infection, and dislocation. When this occurs, a second joint replacement surgery — called a revision surgery — may be necessary. Is Shoulder Joint Replacement for You? The decision to have ...

  1. Generalized metrics induced anatomical prior for MAP PET image reconstruction

    Information theoretic metrics, including mutual information (MI) and joint entropy (JE), have been investigated as priors to incorporate anatomical information in ill-posed positron emission tomography (PET) image reconstruction. These metrics are generally based on the Shannon entropy. Meanwhile, in this paper, we proposed a generalized metrics induced anatomical prior for maximum a posteriori (MAP) PET reconstruction based on the generalized Shannon entropy metrics or Tsallis entropy. For the presented prior computation, a non-parametric method was used to estimate the joint probability density of the PET and MR image. Furthermore, we also developed an one-step-advance (OSA) MAP algorithm for PET image reconstruction with the presented prior regularization. Simulation results show that the presented novel prior has significantly improved the reconstructed PET image quality. (orig.)

  2. International joint ventures

    Sørensen, Karsten Engsig

    2001-01-01

    The article analysis problems connected with corporate joint ventures. Among others the possible conflicts between the joint venture agreement and the statutes of the companies is examined, as well as certain problems connected to the fact that the joint venture partners have created commen control...

  3. Breast Reconstruction After Mastectomy

    ... reconstruction with or without radiotherapy. Current Opinion in Obstetrics and Gynecology 2011;23(1):44–50. [PubMed Abstract] Barry M, Kell MR. Radiotherapy and breast reconstruction: a meta-analysis. Breast ...

  4. Anterior Cruciate Ligament Reconstruction Using a Flexible Reamer System

    Fitzgerald, Judd; Saluan, Paul; Richter, Dustin L.; Huff, Nathan; Schenck, Robert C.

    2015-01-01

    Anatomic reconstruction of the anterior cruciate ligament (ACL) has been shown to improve stability of the knee, particularly rotational stability, potentially leading to superior clinical outcomes and a shorter return to sport. Nonanatomic ACL reconstruction has been linked to graft failure and abnormal cartilage loading thought to contribute to progression of degenerative joint disease. Use of the far anteromedial portal (FAMP) to uncouple the tibial and femoral tunnels has led to improved ...

  5. Surfaces, Digitisations and Reconstructions

    Christensen, Sabrina Tang

    2015-01-01

    We present a new digital reconstruction of r-regular sets in three-dimensional Euclidean space. We introduce a vector field and analyse the relation between the topologies of the boundaries of the r-regular set and its reconstruction. This reconstruction can be carried out faster than prior model...

  6. Towards joint reconstruction of noise and losses in quantum channels

    Piacentini F.

    2016-01-01

    Full Text Available The calibration of a quantum channel, i.e. the determination of the transmission losses affecting it, is definitely one of the principal objectives in both the quantum communication and quantum metrology frameworks. Another task of the utmost relevance is the identification, e.g. by extracting its photon number distribution, of the noise potentially present in the channel.

  7. Towards joint reconstruction of noise and losses in quantum channels

    Piacentini, F; Traina, P; Lolli, L; Taralli, E; Monticone, E; Rajteri, M; Fukuda, D; Degiovanni, I P; Brida, G

    2016-01-01

    The calibration of a quantum channel, i.e. the determination of the transmission losses affecting it, is definitely one of the principal objectives in both the quantum communication and quantum metrology frameworks. Another task of the utmost relevance is the identification, e.g. by extracting its photon number distribution, of the noise potentially present in the channel. Here we present a protocol, based on the response of a photon-number-resolving detector at different quantum efficiencies, able to accomplish both of these tasks at once, providing with a single measurement an estimate of the transmission losses as well as the photon statistics of the noise present in the exploited quantum channel. We show and discuss the experimental results obtained in the practical implementation of such protocol, with different kinds and levels of noise.

  8. Experimental study of the subtalar joint axis: preliminary investigation.

    Zographos, S; Chaminade, B; Hobatho, M C; Utheza, G

    2000-01-01

    An experimental study of the subtalar joint has been conducted with the aim of establishing its axis of movement as well as analysing the associated movement. For description of the axis, CT data for five positions of a single foot were reconstructed using a 3D programme, the 3D data was processed by Patran software. Measures of angular displacements were made from three amputated feet placed in a specially constructed foot frame. Four instantaneous axes of movement could be defined. Calculation of displacements showed an important rolling of the calcaneus (45 degrees). Tacking was evident in inversion, with an opposite displacement between the front and rear part of the calcaneus, whereas during eversion tacking affected only the rear part of the bone: these results were confirmed by 3D reconstructions. Henke's axis was described as that for the talonavicular joint, but acceptable for the subtalar joint. Several authors investigating the coordinates of this axis have reported large differences and described screw-like movements, the latter being incompatible with a fixed axis: instantaneous axes, however are compatible with a screw-like movement. The subtalar joint appears to work as a pivot joint during inversion and as a plane joint during eversion. Although Henke's axis has pedagogical value the subtalar joint has a series of instantaneous axes. PMID:11236321

  9. Component Approach to the Temporomandibular Joint and Coronoid Process

    Pfaff, Miles J.; Clune, James; Steinbacher, Derek

    2014-01-01

    Reconstruction of the temporomandibular joint (TMJ) region is challenging. The conventional direct preauricular incision permits only limited access to the TMJ and surrounding structures, therefore risking injury to the facial nerve during retraction. The ideal approach allows sufficient exposure, preservation of underlying neurovascular structures, and achieves an optimal aesthetic outcome. We describe a preauricular posttragal incision with a superficial musculoaponeurotic system flap to al...

  10. Managing Joint Production Motivation

    Lindenberg, Siegwart; Foss, Nicolai Juul

    2011-01-01

    We contribute to the microfoundations of organizational performance by proffering the construct of joint production motivation. Under such motivational conditions individuals see themselves as part of a joint endeavor, each with his or her own roles and responsibilities; generate shared represent......We contribute to the microfoundations of organizational performance by proffering the construct of joint production motivation. Under such motivational conditions individuals see themselves as part of a joint endeavor, each with his or her own roles and responsibilities; generate shared...... representations of actions and tasks; cognitively coordinate cooperation; and choose their own behaviors in terms of joint goals. Using goal-framing theory, we explain how motivation for joint production can be managed by cognitive/symbolic management and organizational design....

  11. Titanium Cable Bundling in Treatment of Acromioclavicular Dislocation%钛缆捆扎治疗肩锁关节脱位

    吴冬灵; 刘中国; 余跃伟

    2015-01-01

    Objective To investigate the effect of titanium cable in the treatment of the dislocation of the shoulder joint.Methods 28 cases of patients with dislocation of the shoulder joint were treated,and the clinical data were retrospectively analyzed.Results Al patients were folowed up for 3 to 12 months,and al the patients were folowed up for anatomic reduction. The average constant score was 91.4 points at the end of folow-up.Conclusion The use of titanium cable in the treatment of shoulder joint dislocation is significant.%目的:探讨钛缆捆扎治疗肩锁关节脱位的疗效。方法收集28例肩锁关节脱位患者进行治疗,并回顾性分析其临床资料。结果重建后随访3~12个月,所有患者术中、术后锁骨远端高度均达到解剖复位。终末随访时,平均Constant 评分为91.4分。结论采用钛缆捆扎治疗肩锁关节脱位疗效理想。

  12. Cosmic Tidal Reconstruction

    Zhu, Hong-Ming; Yu, Yu; Er, Xinzhong; Chen, Xuelei

    2015-01-01

    The gravitational coupling of a long wavelength tidal field with small scale density fluctuations leads to anisotropic distortions of the locally measured small scale matter correlation function. Since the local correlation function is statistically isotropic in the absence of such tidal interactions, the tidal distortions can be used to reconstruct the long wavelength tidal field and large scale density field in analogy with the cosmic microwave background lensing reconstruction. In this paper we present in detail a formalism for the cosmic tidal reconstruction and test the reconstruction in numerical simulations. We find that the density field on large scales can be reconstructed with good accuracy and the cross correlation coefficient between the reconstructed density field and the original density field is greater than 0.9 on large scales ($k\\lesssim0.1h/\\mathrm{Mpc}$). This is useful in the 21cm intensity mapping survey, where the long wavelength radial modes are lost due to foreground subtraction proces...

  13. Data set on the joint use of shells and red ochre by humans

    Duarte, Carlos M.

    2014-01-01

    Data set on the joint use of shells and red ochre by humans. Reports of the joint use of red ochre and shells by humans are rapidly growing in number, including reports for both modern humans and Nearderthals. Existing records track the reconstructed dispersal of modern humans including findings of the joint use of red ochre and shells in Africa, Eurasia, Australia, and America ranging from paleorecords starting in 250 ka to present. Numbers show, for paleoanthropological evidence, the dates ...

  14. 下胫腓联合损伤三种内固定方式稳定性重建生物力学评价%Biomechanical Evaluation for the Stability Reconstruction of Ankle Joints with Distal Tibiofibular Syn-desmosis Injury via 3 Different Internal Fixation Methods

    费骏; 赖震; 吴新红; 王以进; 魏威

    2015-01-01

    Objective To investigate the biomechanics of the stability reconstruction of ankle joints with distal tibiofibular syndesmosis injury by means of three cortical single screw, three cortical two screws or three cortical two screws plus 1/3 tube type plate fixation, in order to provide a scientific basis for clinical selection of effective internal fixation method. Methods Lower limbs from 6 fresh adult cadaver were used to make standard ankle in-jury models and then were divided into normal group, distal tibiofibular syndesmosis injury group, fixation with three cortical single screw group(A1), fixation with three cortical 2 screws group(B1), and fixation with three cor-tical 2 screws plus 1/3 tube type and plate fixation group (C1). The load was applied on tibiofibular bone of the shank to simulate the 4 physiological movement of the foot, i.e. neutral position, plantar flexion(30o), dorsal flexion (20o), and supination external rotation, and the strength, stiffness, and stability of ankle joint were measured after-wards. Results After the distal tibiofibular syndesmosis injury, the strength and stiffness of the ankle joint signifi-cantly decreased compared to normal group: the stress intensity of the medial and lateral malleolus reduced by 21% and 39%, respectively; the stress intensity of the anterior and posterior malleolus decreased by 29% and 35%,respectively; the EF and GF reduced by 27% and 28%, respectively(all P0.05), and that in B1 and C1 groups were significantly higher than that in normal group(P0.05). The EF and GF in A1, B1, and C1 groups were higher than that in normal group (P0.05). Conclusion The fractured ankle treated with three cortical single screw fixation has similar mechanical properties to normal ankle, and those treated with other 2 methods have more strength. Too much strength may lead to decrease of joint activity compliance and stress increase, result-ing in screw loosening or fatigue fracture of the ankle syndesmosis.%目的:观测

  15. Re-construction

    Bernadette Marie Devilat

    2013-01-01

    Re-construct: to build again. The necessary reconstruction process after an earthquake can be seen as an opportunity to improve previous conditions. All damaged buildings undergo a renovation process in which every piece is carefully returned to its original place. The photograph shows roof reconstruction work in San Pedro de Alcántara, a heritage area in the central valley of Chile, which was particularly affected by the 2010 earthquake. 

  16. Flexor pulley reconstruction.

    Dy, Christopher J; Daluiski, Aaron

    2013-05-01

    Flexor pulley reconstruction is a challenging surgery. Injuries often occur after traumatic lacerations or forceful extension applied to an acutely flexed finger. Surgical treatment is reserved for patients with multiple closed pulley ruptures, persistent pain, or dysfunction after attempted nonoperative management of a single pulley rupture, or during concurrent or staged flexor tendon repair or reconstruction. If the pulley cannot be repaired primarily, pulley reconstruction can be performed using graft woven into remnant pulley rim or looping graft around the phalanx. Regardless of the reconstructive technique, the surgeon should emulate the length, tension, and glide of the native pulley. PMID:23660059

  17. Application of CT 3D reconstruction in diagnosing atlantoaxial subluxation

    段少银; 林清池; 庞瑞麟

    2004-01-01

    Objective:To evaluate and compare the diagnostic value in atlantoaxial subluxation by CT three-dimensional (3D) reconstruction.Methods:3D reconstruction fimdings of 41 patients with atlantoaxiai subluxation were retrospectively analyzed, and comparisons were made among images of transverse section, multiplanar reformorting (MPR), surface shade display (SSD), maximum intensity project (MIP), and volume rendering (VR). Results:Of 41 patients with atlantoaxial subluxation, 31 belonged to rotary dislocation, 5 antedislocation, and 5 hind dislocation. All the cases showed the dislocated joint panel of atlantoaxial articulation.Fifteen cases showed deviation of the odontoid process and 8 cases widened distance between the dens and anterior arch of the atlas. The dislocated joint panel of atlantoaxial articulation was more clearly seen with SSD-3D imaging than any other methods. Conclusions:Atlantoaxial subluxation can well be diagnosed by CT 3D reconstruction, in which SSD-3D imaging is optimal.

  18. Sacroiliac joint pain - aftercare

    The sacroiliac joint (SIJ) is a term used to describe the place where the sacrum and the iliac bones join. The ... The main purpose of the joint is to connect the spine and the pelvis. As a result, there is very little movement at the SIJ. Major reasons ...

  19. JET Joint Undertaking

    The paper presents the progress report of the Joint European Torus (JET) Joint Undertaking, 1986. The report contains a survey of the scientific and technical achievements on JET during 1986; the more important articles referred to in this survey are reproduced as appendices to this Report. The last section discusses developments which might improve the overall performance of the machine. (U.K.)

  20. "Nonfloating" universal joint

    Appleberry, W. T.

    1978-01-01

    Modified crowned-spline joint is lightweight, durable, and requires minimum of parts. It does not use rubber cushions to limit play and is useful over wide temperature range. It has inner ball and socket to provide rigid connection with no axial play. Joint can be adapted to form pinned connection between segmented torque tubes.

  1. MR diagnosis of temporomandibular joint. A study of joint effusion

    Kaneda, Takashi; Yamashiro, Mitsuaki; Ozawa, Kaoru; Suzuki, Hiromi; Okada, Hiroyuki; Yamamoto, Hirotsugu [Nihon Univ., Matsudo, Chiba (Japan). School of Dentistry

    1998-03-01

    The purposes of this study were to evaluate the relationship between correlation of MR joint effusion of the temporomandibular joint and disk position, to evaluate the relationship between joint effusion and aging, and to assess the frequency of MR joint effusion of bilateral temporomandibular joints. The temporomandibular joints of 192 patients with clinical symptoms of temporomandibular joint disorders were imaged bilaterally using high field, surface-coil MR imaging. Oblique sagittal and coronal proton density-weighted and T2-weighted images were obtained. Imaging findings of joint effusion were correlated with disk position, aging, and bilateral temporomandibular joints. MR showed effusion in 4% of the joints with normal superior disk position, 36% of the joints with disk displacement with reduction, and 45% of the joints with disk displacement without reduction. There were significant differences in the incidence of joint effusion between normal disk position and anterior disk displacement with or without reduction. Younger patients less than 40 years were significant higher the incidence of joint effusion than those of older patients. A significant association was seen between joint effusion and aging. MR showed effusion in 17% of the unilateral temporomandibular joint, 24% of the bilateral temporomandibular joints. There was no significant difference between unilateral and bilateral case. These results indicated that joint effusion using MR imaging was associated with varied temporomandibular joint pathologic states. (author)

  2. MR diagnosis of temporomandibular joint. A study of joint effusion

    The purposes of this study were to evaluate the relationship between correlation of MR joint effusion of the temporomandibular joint and disk position, to evaluate the relationship between joint effusion and aging, and to assess the frequency of MR joint effusion of bilateral temporomandibular joints. The temporomandibular joints of 192 patients with clinical symptoms of temporomandibular joint disorders were imaged bilaterally using high field, surface-coil MR imaging. Oblique sagittal and coronal proton density-weighted and T2-weighted images were obtained. Imaging findings of joint effusion were correlated with disk position, aging, and bilateral temporomandibular joints. MR showed effusion in 4% of the joints with normal superior disk position, 36% of the joints with disk displacement with reduction, and 45% of the joints with disk displacement without reduction. There were significant differences in the incidence of joint effusion between normal disk position and anterior disk displacement with or without reduction. Younger patients less than 40 years were significant higher the incidence of joint effusion than those of older patients. A significant association was seen between joint effusion and aging. MR showed effusion in 17% of the unilateral temporomandibular joint, 24% of the bilateral temporomandibular joints. There was no significant difference between unilateral and bilateral case. These results indicated that joint effusion using MR imaging was associated with varied temporomandibular joint pathologic states. (author)

  3. COMPARATIVE STUDY OF ARTHROSCOPIC SINGLE BUNDLE ANTERIOR CRUCIATE LIGAMENT RECONSTRUCTION AND NON-ANATOMICAL DOUBLE BUNDLE WITH SINGLE TIBIAL TUNNEL ANTERIOR CRUCIATE LIGAMENT RECONSTRUCTION WITH SEMITENDINOSUS ± GRACILIS AUTOGRAFTS USING LAXOMETRY

    Sivananda

    2016-01-01

    Full Text Available BACKGROUND The knee joint is the most commonly injured of all joints and the ACL is the most commonly injured ligament. Arthroscopic reconstruction of ACL has become gold standard in treating these injuries. AIM 1. To compare the short-term results of ACL reconstruction using single bundle (one Tibial + one Femoral tunnel and non-anatomical double-bundle (one Tibial + two Femoral tunnels techniques using Hamstrings (Semitendinosus ± Gracilis graft. 2. To evaluate ACL graft reconstruction stability measured by laxometry and to find out an association with clinical findings. MATERIAL & METHODS We performed a prospective study between 2014-2015 of 20 case of ACL injuries & compared single bundle reconstruction with Non – anatomical double Bundle reconstruction with semitendinosus ± Gracilis, Autograft using laxometry. CONCLUSION Arthroscopic Non-anatomical double ACL Reconstruction is Bio-mechanically stable reconstruction resembling anatomy of the ACL.

  4. Surgery of temporomandibular joint under local anaesthesia

    Gajiwala Kalpesh

    2008-01-01

    Full Text Available Temporomandibular joint ankylosis is a debilitating disorder arising from an inability to open the mouth. This leads to poor nutrition, poor dental hygiene, and stunted growth. Anaesthesia, especially general anaesthesia, is very difficult to administer. There is a lack of direct visualization of the vocal cords, tongue fall following relaxation, and an already narrowed passage due to a small mandible, which makes even the blind nasal intubation difficult. There are various techniques described in literature to overcome these challenges, failing which, one needs to do tracheostomy. All the risks of difficult intubation and general anaesthesia can be avoided if the surgery is done under local anaesthesia. A simple but effective method of successful local anaesthesia is described, which allows successful temporomandibular joint reconstruction.

  5. Image Reconstruction. Chapter 13

    This chapter discusses how 2‑D or 3‑D images of tracer distribution can be reconstructed from a series of so-called projection images acquired with a gamma camera or a positron emission tomography (PET) system [13.1]. This is often called an ‘inverse problem’. The reconstruction is the inverse of the acquisition. The reconstruction is called an inverse problem because making software to compute the true tracer distribution from the acquired data turns out to be more difficult than the ‘forward’ direction, i.e. making software to simulate the acquisition. There are basically two approaches to image reconstruction: analytical reconstruction and iterative reconstruction. The analytical approach is based on mathematical inversion, yielding efficient, non-iterative reconstruction algorithms. In the iterative approach, the reconstruction problem is reduced to computing a finite number of image values from a finite number of measurements. That simplification enables the use of iterative instead of mathematical inversion. Iterative inversion tends to require more computer power, but it can cope with more complex (and hopefully more accurate) models of the acquisition process

  6. Bitzer's Model Reconstructed.

    Lybarger, Scott; Smith, Craig R.

    1996-01-01

    Reconstructs Lloyd Bitzer's situational model to serve as a guide for the generation of multiperspectival critical assessments of rhetorical discourse. Uses two of President Bush's speeches on the drug crisis to illustrate how the reconstructed model can account for such modern problems as multiple audiences, perceptions, and exigencies. (PA)

  7. The CMS Reconstruction Software

    Lange, David J.; CMS Collaboration

    2011-12-01

    We report on the status and plans for the event reconstruction software of the CMS experiment. The CMS reconstruction algorithms are the basis for a wide range of data analysis approaches currently under study by the CMS collaboration using the first high-energy run of the LHC. These algorithms have been primarily developed and validated using simulated data samples, and are now being commissioned with LHC proton-proton collision data samples. The CMS reconstruction is now operated routinely on all events triggered by the CMS detector, both in a close to real-time prompt reconstruction processing and in frequent passes over the full recorded CMS data set. We discuss the overall software design, development cycle, computational requirements and performance, recent operational performance, and planned improvements of the CMS reconstruction software.

  8. Medial plica after reconstruction of anterior cruciate ligament

    YIN Yu; WANG Jian-quan; HE Zhen-ming

    2009-01-01

    Background The medial plica may be caused by direct trauma or joint degeneration,which also could be iatrogenic.There have been few reports in the literature discussing incidence of the medial plica caused by an operation on the knee joint,specifically after the reconstruction of anterior cruciate ligament (ACL).In this study,we aimed to evaluate and analyze the relationship between the incidence of the medial plica and reconstruction of the ACL.Methods A retrospective case series study was conducted to review the findings of 1085 patients between 2003 and 2007,who underwent second-look arthroscopy after reconstruction of the ACL (between 2002 and 2006).The correlation of the incidence of medial plica with the stability of the knee joint,the time from onset of injury to reconstruction surgery,the associated injuries,and the rate of progress during postoperative rehabilitation were analyzed.Results We found that 722 patients had the structure of a medial plica.The incidence after reconstruction of the anterior cruciate ligament (66.5%) was significantly higher than usually reported.All these medial plica had avascular fibrotic and thickened edges.An excision of pathologic medial plica and fat pad synovial fringes were done.The incidences were significantly different between the two groups with their reconstruction operation time,from onset of injury to surgery (less than one month or over 2 years),and the progress rate of postoperative rehabilitation (knee flexion could not be over 90° in four weeks).The incidence was not different between the groups with knee stable conditions.Conclusions Medial plica is more common in patients after reconstruction of ACL.More associated injuries and more rehabilitation difficulties can increase the medial plica incidence.

  9. Reconstruction from gamma radiography and ultrasonic images

    This work deals with the three-dimensional reconstruction from gamma radiographic and ultrasonic images. Such an issue belongs to the field of data fusion since the data provide complementary information. The two sets of data are independently related to two sets of parameters: gamma ray attenuation and ultrasonic reflectivity. The fusion problem is addressed in a Bayesian framework; the kingpin of the task is then to define a joint a priori model for both attenuation and reflectivity. Thus, the developing of this model and the entailed joint estimation constitute the principal contribution of this work. The results of real data treatments demonstrate the validity of this method as compared to a sequential approach of the two sets of data

  10. Rotationplasty for patients with osteosarcoma around the knee joint.

    Kawai,Akira

    1995-08-01

    Full Text Available The results of rotationplasty for patients with osteosarcoma around the knee joint are presented. After an average observation period of 13.3 months, there has been no local recurrence or metastasis. The ankle joints (the new knee joints of the patients were able to support their body weight with an average range of motion of 75 degrees. All patients could walk well without crutches and without risk of the giving way phenomenon. The average rate of the functional evaluation according to the re-modified system by Enneking was 84.5% (range, 80.0-86.7%. No patient had psychological trouble in accepting the shortened and rotated extremity. The results show that rotationplasty is a useful reconstructive method for the treatment of osteosarcoma around the knee joint.

  11. Joint Quantum Institute

    Federal Laboratory Consortium — The Joint Quantum Institute (JQI) is pursuing that goal through the work of leading quantum scientists from the Department of Physics of the University of Maryland...

  12. Joint Injection/Aspiration

    ... Working It Out: Common Techniques for Conflict Resolution Workplace Diversity & Team Performance CME & MOC Understanding MOC ACR's MOC ... infection is suspected, aspirating the joint to gather cultures is ... Communications and Marketing. This patient information is provided for ...

  13. MP Joint Arthritis

    ... Therapist? Media Find a Hand Surgeon MP Joint Arthritis Email to a friend * required fields From * To * ... in to name and customize your collection. DESCRIPTION Arthritis is the wearing away of the cartilage at ...

  14. Hip joint replacement

    ... may have problems with infection, loosening, or even dislocation of the new hip joint. Over time the artificial ... Professor, Chief, Sports Medicine and Shoulder Service, UCSF Department of Orthopaedic Surgery, San Francisco, ...

  15. Temporomandibular Joint Disorder

    ... 2008 Previous Next Related Articles: Temporomandibular Joint Disorder (TMD) Are You Biting Off More Than You Can Chew? Equilibration May Lessen TMD Pain Fender-benders: Source of TMD? First Comes ...

  16. Healthy Joints Matter

    ... dietary supplements, such as green tea and various vitamins, to see if they can keep your joints ... body, such as your ears, nose, and windpipe. Fibromyalgia (fi-bro-my-AL-juh). A condition that ...

  17. Delayed breast implant reconstruction

    Hvilsom, Gitte B.; Hölmich, Lisbet R.; Steding-Jessen, Marianne;

    2011-01-01

    -stage procedures. From the Danish Registry for Plastic Surgery of the Breast, which has prospectively registered data for women undergoing breast implantations since 1999, we identified 559 women without a history of radiation therapy undergoing 592 delayed breast reconstructions following breast cancer during the......Studies of complications following reconstructive surgery with implants among women with breast cancer are needed. As the, to our knowledge, first prospective long-term study we evaluated the occurrence of complications following delayed breast reconstruction separately for one- and two...

  18. Simultaneous Reconstruction and Segmentation with Class-Specific Priors

    Romanov, Mikhail

    number of material classes and their parameters are assumed known a priori. These parameters are the mean value of the class attenuation coefficients and their standard deviations. Given this input together with projection data, the problem is to find the image and HMMFM. The segmentation is obtained...... thesis investigates computing the reconstruction and segmentation simultaneously. The advantage of this is that because the reconstruction and segmentation are computed jointly, reconstruction errors are not propagated to the segmentation step. Furthermore the segmentation procedure can be used for...... from the HMMFM as the most probable class in each pixel. The solution for the reconstruction and segmentation problem is found using an algorithm that simultaneously minimizes the reprojection error, deviation of the grey levels of pixels from known mean values and the spatial differences in the class...

  19. Joint contingency contracting

    Johnson, Ellsworth K.; Paton, Bryan H.; Threat, Edward W.; Haptonstall, Lisa A.

    2005-01-01

    The purpose of this Master of Business Administration (MBA) Professional Report is to investigate and analyze the means by which Contingency Contracting Officers (CCO) can effectively operate in a Joint contingency environment and to validate the Defense Contract Management Agency's (DCMA) entry and exit criteria for contingency contracting missions. Joint contingencies encompass regional conflicts, humanitarian and peacekeeping missions, and international or domestic disaster relief missions...

  20. Joint Aspiration: Arthrocentesis

    Mackie, John William

    1987-01-01

    Joint aspiration is an easily mastered procedure used to confirm or rule out joint sepsis and crystal-induced arthrosis. It is routinely performed with or without local anaesthetic, or with cooling spray. The time spent obtaining the fluid is short. The procedure is safe, requiring no hospitalization, except in the case of diagnosed sepsis. Arthrocentesis is a necessary procedure to prove beyond reasonable doubt that infection is not the cause of the arthritis. The family physician must be fa...

  1. Joint Venture Contracts

    Pimentel, Dinarco

    2015-01-01

    Joint Venture contracts are contracting models typically designed to reach international markets. In spite of being used at the national level, a joint venture is based on single or multiple contracts between two individuals, two institutions, two organizations or two different entrepreneurial entities joining forces, meeting synergies to reach a common goal.Initially, these types of contracts were justifiable based on the need of different economic agents penetrating the most inaccessible ma...

  2. A symptomatic coracoclavicular joint.

    Cheung, T F S; Boerboom, A L; Wolf, R F E; Diercks, R L

    2006-11-01

    Bilateral coracoclavicular joints were found in a 44-year-old male patient following a fall. He had an Indonesian mother and a Dutch father. Prior to the injury he was asymptomatic and had full range of movement in both shoulders but the trauma resulted in pain and limitation of movement in the left shoulder which required resection of the anomalous joint, after which full pain-free movement was restored. PMID:17075101

  3. Surgical Ventricular Reconstruction

    Full Text Available SURGICAL VENTRICULAR RECONSTRUCTION MONTEFIORE-EINSTEIN HEART CENTER NEW YORK CITY, NEW YORK February 13, 2008 00:00:09 NARRATOR: Welcome to the Montefiore-Einstein Heart Center in ...

  4. Surgical Ventricular Reconstruction

    Full Text Available SURGICAL VENTRICULAR RECONSTRUCTION MONTEFIORE-EINSTEIN HEART CENTER NEW YORK CITY, NEW YORK February 13, 2008 00:00:09 NARRATOR: Welcome to the Montefiore-Einstein Heart Center in New York City. In ...

  5. Prairie Reconstruction Initiative

    US Fish and Wildlife Service, Department of the Interior — The purpose of the Prairie Reconstruction Initiative Advisory Team (PRIAT) is to identify and take steps to resolve uncertainties in the process of prairie...

  6. Overview of Image Reconstruction

    Marr, R. B.

    1980-04-01

    Image reconstruction (or computerized tomography, etc.) is any process whereby a function, f, on Rn is estimated from empirical data pertaining to its integrals, ∫f(x) dx, for some collection of hyperplanes of dimension k < n. The paper begins with background information on how image reconstruction problems have arisen in practice, and describes some of the application areas of past or current interest; these include radioastronomy, optics, radiology and nuclear medicine, electron microscopy, acoustical imaging, geophysical tomography, nondestructive testing, and NMR zeugmatography. Then the various reconstruction algorithms are discussed in five classes: summation, or simple back-projection; convolution, or filtered back-projection; Fourier and other functional transforms; orthogonal function series expansion; and iterative methods. Certain more technical mathematical aspects of image reconstruction are considered from the standpoint of uniqueness, consistency, and stability of solution. The paper concludes by presenting certain open problems. 73 references. (RWR)

  7. Surgical Ventricular Reconstruction

    Full Text Available ... reconstruction. This study is going to be a land…landmark study. And in all likelihood will influence ... improve postoperatively. But, nevertheless, this is an acute change and may take some time for the myocardium ...

  8. Overview of image reconstruction

    Image reconstruction (or computerized tomography, etc.) is any process whereby a function, f, on R/sup n/ is estimated from empirical data pertaining to its integrals, ∫f(x) dx, for some collection of hyperplanes of dimension k < n. The paper begins with background information on how image reconstruction problems have arisen in practice, and describes some of the application areas of past or current interest; these include radioastronomy, optics, radiology and nuclear medicine, electron microscopy, acoustical imaging, geophysical tomography, nondestructive testing, and NMR zeugmatography. Then the various reconstruction algorithms are discussed in five classes: summation, or simple back-projection; convolution, or filtered back-projection; Fourier and other functional transforms; orthogonal function series expansion; and iterative methods. Certain more technical mathematical aspects of image reconstruction are considered from the standpoint of uniqueness, consistency, and stability of solution. The paper concludes by presenting certain open problems. 73 references

  9. Breast reconstruction - natural tissue

    After a mastectomy , some women choose to have cosmetic surgery to remake their breast. This type of surgery ... Risks of anesthesia and surgery are: Reactions to medicines Breathing problems Bleeding, blood clots , or infection Risks of breast reconstruction with ...

  10. Permutationally invariant state reconstruction

    Moroder, Tobias; Toth, Geza; Schwemmer, Christian; Niggebaum, Alexander; Gaile, Stefanie; Gühne, Otfried; Weinfurter, Harald

    2012-01-01

    Feasible tomography schemes for large particle numbers must possess, besides an appropriate data acquisition protocol, also an efficient way to reconstruct the density operator from the observed finite data set. Since state reconstruction typically requires the solution of a non-linear large-scale optimization problem, this is a major challenge in the design of scalable tomography schemes. Here we present an efficient state reconstruction scheme for permutationally invariant quantum state tomography. It works for all common state-of-the-art reconstruction principles, including, in particular, maximum likelihood and least squares methods, which are the preferred choices in today's experiments. This high efficiency is achieved by greatly reducing the dimensionality of the problem employing a particular representation of permutationally invariant states known from spin coupling combined with convex optimization, which has clear advantages regarding speed, control and accuracy in comparison to commonly employed n...

  11. Surgical Ventricular Reconstruction

    Full Text Available ... a better procedure, the ventricular reconstruction or heart transplantation. This particular viewer actually saw our previous video on heart transplantation. And to answer that question, they are both ...

  12. On TPC cluster reconstruction

    Dydak, F; Nefedov, Y; Wotschack, J; Zhemchugov, A

    2004-01-01

    For a bias-free momentum measurement of TPC tracks, the correct determination of cluster positions is mandatory. We argue in particular that (i) the reconstruction of the entire longitudinal signal shape in view of longitudinal diffusion, electronic pulse shaping, and track inclination is important both for the polar angle reconstruction and for optimum r phi resolution; and that (ii) self-crosstalk of pad signals calls for special measures for the reconstruction of the z coordinate. The problem of 'shadow clusters' is resolved. Algorithms are presented for accepting clusters as 'good' clusters, and for the reconstruction of the r phi and z cluster coordinates, including provisions for 'bad' pads and pads next to sector boundaries, respectively.

  13. Surgical Ventricular Reconstruction

    Full Text Available ... He has not been readmitted for any reasons related to heart failure. 00:41:57 ROBERT E. ... question, because it really deals with whether anything related to surgical ventricular reconstruction would add to the ...

  14. Chalet. Reconstruction from Memory

    Gheysen, Eva

    2015-01-01

    In the research project several design tactics are developed in order to counteract the phenomenon of experiential erosion. This particular project explored one of the tactics: Reconstruction from Memory. When reconstructing space from memory, isolated spatial fragments from the past are reformed into a new, decontextualized construct that represents the most memorable experiences evoked by that space. These memories give insight in which architectural features strongly affect our experience ...

  15. Reconstructing baryon oscillations

    Noh, Yookyung; White, Martin; Padmanabhan, Nikhil

    2009-01-01

    The baryon acoustic oscillation (BAO) method for constraining the expansion history is adversely affected by non-linear structure formation, which washes out the correlation function peak created at decoupling. To increase the constraining power of low z BAO experiments, it has been proposed that one use the observed distribution of galaxies to "reconstruct'' the acoustic peak. Recently Padmanabhan, White and Cohn provided an analytic formalism for understanding how reconstruction works withi...

  16. Cosmic tidal reconstruction

    Zhu, Hong-Ming; Pen, Ue-Li; Yu, Yu; Er, Xinzhong; Chen, Xuelei

    2016-05-01

    The gravitational coupling of a long-wavelength tidal field with small-scale density fluctuations leads to anisotropic distortions of the locally measured small-scale matter correlation function. Since the local correlation function is known to be statistically isotropic in the absence of such tidal interactions, the tidal distortions can be used to reconstruct the long-wavelength tidal field and large-scale density field in analogy with the cosmic microwave background lensing reconstruction. In this paper we present the theoretical framework of cosmic tidal reconstruction and test the reconstruction in numerical simulations. We find that the density field on large scales can be reconstructed with good accuracy and the cross-correlation coefficient between the reconstructed density field and the original density field is greater than 0.9 on large scales (k ≲0.1 h /Mpc ), with the filter scale ˜1.25 Mpc /h . This is useful in the 21 cm intensity mapping survey, where the long-wavelength radial modes are lost due to a foreground subtraction process.

  17. Permutationally invariant state reconstruction

    Moroder, Tobias; Hyllus, Philipp; Tóth, Géza;

    2012-01-01

    Feasible tomography schemes for large particle numbers must possess, besides an appropriate data acquisition protocol, an efficient way to reconstruct the density operator from the observed finite data set. Since state reconstruction typically requires the solution of a nonlinear large-scale opti......Feasible tomography schemes for large particle numbers must possess, besides an appropriate data acquisition protocol, an efficient way to reconstruct the density operator from the observed finite data set. Since state reconstruction typically requires the solution of a nonlinear large......-scale optimization problem, this is a major challenge in the design of scalable tomography schemes. Here we present an efficient state reconstruction scheme for permutationally invariant quantum state tomography. It works for all common state-of-the-art reconstruction principles, including, in particular, maximum...... likelihood and least squares methods, which are the preferred choices in today's experiments. This high efficiency is achieved by greatly reducing the dimensionality of the problem employing a particular representation of permutationally invariant states known from spin coupling combined with convex...

  18. Forming a multinational joint venture

    This paper discusses the basis and mechanics for forming a multinational joint venture. The topics of the paper include the motivations for a joint venture, selection of the appropriate co-venturer, management of the multinational joint venture, and the joint venture agreement. The authors state that a joint venture is not applicable or desirable in all instances and to be successful, must be carefully planned

  19. The temporomandibular joint

    Whilst the temporomandibular joint is in many ways unique, it is subject to all the diseases and disorders found in joints in other parts of the human skeleton. By far the most common disorder is injury, followed by arthropathy, acute and chronic dislocations, ankylosis, and in rare instances, neoplasms. The diagnosis and management of the temporomandibular joint are the primary responsibility of the oral surgeon. Nevertheless, this anatomical region is an area in which the cooperation of medical and dental disciplines may be required for the satisfactory conclusion of treatment. The more so when the disease process involves either associated psychosomatic illness or malignancy. The mainstay of the diagnosis is a careful radiological examination of the joint. There exists a delicate relationship between the dentition, the muscles of mastication, and the temporomandibular articulation, which is controlled by arthrokinetic reflex activity of the branches of the 5th cranial nerve. Imbalance between one or more of the components of this integrated system frequently leads to disturbances in function. Pain-dysfunction disorders constitute the larger part of temporomandibular joint disturbances generally encountered

  20. Periprosthetic Joint Infections

    Ana Lucia L. Lima

    2013-01-01

    Full Text Available Implantation of joint prostheses is becoming increasingly common, especially for the hip and knee. Infection is considered to be the most devastating of prosthesis-related complications, leading to prolonged hospitalization, repeated surgical intervention, and even definitive loss of the implant. The main risk factors to periprosthetic joint infections (PJIs are advanced age, malnutrition, obesity, diabetes mellitus, HIV infection at an advanced stage, presence of distant infectious foci, and antecedents of arthroscopy or infection in previous arthroplasty. Joint prostheses can become infected through three different routes: direct implantation, hematogenic infection, and reactivation of latent infection. Gram-positive bacteria predominate in cases of PJI, mainly Staphylococcus aureus and Staphylococcus epidermidis. PJIs present characteristic signs that can be divided into acute and chronic manifestations. The main imaging method used in diagnosing joint prosthesis infections is X-ray. Computed tomography (CT scan may assist in distinguishing between septic and aseptic loosening. Three-phase bone scintigraphy using technetium has high sensitivity, but low specificity. Positron emission tomography using fluorodeoxyglucose (FDG-PET presents very divergent results in the literature. Definitive diagnosis of infection should be made by isolating the microorganism through cultures on material obtained from joint fluid puncturing, surgical wound secretions, surgical debridement procedures, or sonication fluid. Success in treating PJI depends on extensive surgical debridement and adequate and effective antibiotic therapy. Treatment in two stages using a spacer is recommended for most chronic infections in arthroplasty cases. Treatment in a single procedure is appropriate in carefully selected cases.

  1. The CMS Muon Reconstruction Software

    Trocino, Daniele

    2009-01-01

    Muonic final states will provide clean signatures for many physics processes at the LHC. One of the main goals of the Compact Muon Solenoid (CMS) design is thus to ensure efficient and accurate identification and reconstruction of muons. A sophisticated muon system is used for muon identification and stand-alone reconstruction and the inner silicon tracker exploits the high magnetic field to ensure a very precise transverse momentum resolution. The global reconstruction algorithms combine muons reconstructed in the dedicated spectrometer with tracks reconstructed in the inner detector. The CMS reconstruction software is well suited for both offline reconstruction and online event selection (HLT) and its performance has been studied in detail using Monte Carlo simulations. The muon reconstruction has also been employed successfully to reconstruct cosmic muons traversing the CMS detector. The design of the CMS muon identification and reconstruction is presented, as well as its performance on simulated and cosmi...

  2. Nipple-areola complex reconstruction

    Nimboriboonporn, Anongporn; Chuthapisith, Suebwong

    2014-01-01

    Nipple areolar reconstruction (NAC) was introduced since 1940s and evolved as parallel with breast reconstruction since era of breast cancer treatment. It consists of nipple and areolar reconstruction. Ideal reconstruction of the NAC requires symmetry in position, size, shape, texture, and pigmentation and permanent projection. There are many innovative ways to create a nipple and each method has its unique characteristics that apply to certain breast types. NAC reconstruction techniques comp...

  3. Total ankle joint replacement.

    2016-02-01

    Ankle arthritis results in a stiff and painful ankle and can be a major cause of disability. For people with end-stage ankle arthritis, arthrodesis (ankle fusion) is effective at reducing pain in the shorter term, but results in a fixed joint, and over time the loss of mobility places stress on other joints in the foot that may lead to arthritis, pain and dysfunction. Another option is to perform a total ankle joint replacement, with the aim of giving the patient a mobile and pain-free ankle. In this article we review the efficacy of this procedure, including how it compares to ankle arthrodesis, and consider the indications and complications. PMID:26868932

  4. Transversely Compressed Bonded Joints

    Hansen, Christian Skodborg; Schmidt, Jacob Wittrup; Stang, Henrik

    2012-01-01

    The load capacity of bonded joints can be increased if transverse pressure is applied at the interface. The transverse pressure is assumed to introduce a Coulomb-friction contribution to the cohesive law for the interface. Response and load capacity for a bonded single-lap joint was derived using...... non-linear fracture mechanics. The results indicated a good correlation between theory and tests. Furthermore, the model is suggested as theoretical base for determining load capacity of bonded anchorages with transverse pressure, in externally reinforced concrete structures....

  5. Expansion joints for LMFBR

    This discourse recounts efforts put into the SNR-2 project; specifically the development of compensation devices. The various prototypes of these compensation devices are described and the state of the development reviewed. Large Na (sodium)-heat transfer systems require a lot of valuable space if the component lay-out does not include compensation devices. So, in order to condense the spatial requirement as much as possible, expansion joints must be integrated into the pipe system. There are two basic types to suit the purpose: axial expansion joints and angular expansion joints. The expansion joints were developed on the basis of specific design criteria whereby differentiation is made between expansion joints of small and large nominal diameter. Expansion joints for installation in the sodium-filled primary piping are equipped with safety bellows in addition to the actual working bellows. Expansion joints must be designed and mounted in a manner to completely withstand seismic forces. The design must exclude any damage to the bellows during intermittent operations, that is, when sodium is drained the bellows' folds must be completely empty; otherwise residual solidified sodium could destroy the bellows when restarting. The expansion joints must be engineered on the basis of the following design data for the secondary system of the SNR project: working pressure: 16 bar; failure mode pressure: 5 events; failure mode: 5 sec., 28.5 bar, 520 deg. C; working temperature: 520 deg. C; temperature transients: 30 deg. C/sec.; service life: 200,000 h; number of load cycles: 104; material: 1.4948 or 1.4919; layer thickness of folds: 0.5 mm; angular deflection (DN 800): +3 deg. C or; axial expansion absorption (DN 600): ±80 mm; calculation: ASME class. The bellows' development work is not handled within this scope. The bellows are supplied by leading manufacturers, and warrant highest quality. Multiple bellows were selected on the basis of maximum elasticity - a property

  6. Alternative reconstruction after pancreaticoduodenectomy

    Cooperman Avram M

    2008-01-01

    Full Text Available Abstract Background Pancreaticoduodenectomy is the procedure of choice for tumors of the head of the pancreas and periampulla. Despite advances in surgical technique and postoperative care, the procedure continues to carry a high morbidity rate. One of the most common morbidities is delayed gastric emptying with rates of 15%–40%. Following two prolonged cases of delayed gastric emptying, we altered our reconstruction to avoid this complication altogether. Subsequently, our patients underwent a classic pancreaticoduodenectomy with an undivided Roux-en-Y technique for reconstruction. Methods We reviewed the charts of our last 13 Whipple procedures evaluating them for complications, specifically delayed gastric emptying. We compared the outcomes of those patients to a control group of 15 patients who underwent the Whipple procedure with standard reconstruction. Results No instances of delayed gastric emptying occurred in patients who underwent an undivided Roux-en-Y technique for reconstruction. There was 1 wound infection (8%, 1 instance of pneumonia (8%, and 1 instance of bleeding from the gastrojejunal staple line (8%. There was no operative mortality. Conclusion Use of the undivided Roux-en-Y technique for reconstruction following the Whipple procedure may decrease the incidence of delayed gastric emptying. In addition, it has the added benefit of eliminating bile reflux gastritis. Future randomized control trials are recommended to further evaluate the efficacy of the procedure.

  7. Digital tomosynthesis of hand joints for arthritis assessment

    The two principal forms of hand arthritis, rheumatoid arthritis (RA) and osteoarthritis (OA) have large clinical and economic costs. Radiography has been shown to be a useful tool to assess the condition of the disease. A hand radiograph, however, is a two-dimensional projection of a three-dimensional object. In this report we present the results of a study that applied digital tomosynthesis to hand radiography in order to extract three-dimensional outcome measures that should be more sensitive to arthritis progression. The study was performed using simulated projection radiographs created using micro computed tomography (μCT) and a set of five dry-bone hand skeletons. These simulated projection images were then reconstructed into tomographic slices using the matrix inversion tomosynthesis (MITS) algorithm. The accuracy of the tomosynthesis reconstruction was evaluated by comparing the reconstructed images to a gold standard created using the μCT data. A parameter from image registration science, normalized mutual information, provided a quantifiable figure of merit. This study examined the effects of source displacement, number of reconstructed planes, number of acquisitions, noise added to the gray scale images, and errors in the location of a fiducial marker. We also optimized the reconstruction as a function of two variables k and α, that controlled the mixing of MITS with conventional shift-and-add tomosynthesis. A study using hand delineated joint margins demonstrated that MITS images provided a better measurement of average joint space width. We found good agreement between the MITS slices and the true planes. Both joint margins and trabecular structure were visible and the reconstructed slices showed additional structures not visible with the standard projection image. Using hand-delineated joint margins we compared the average joint space width of the gold standard slices to the MITS and projection images. A root-mean square deviation (RMSD), calculated

  8. A FINE GRANULAR JOINT SOURCE CHANNEL CODING METHOD

    Zhuo Li; Shen Lansun; Zhu Qing

    2003-01-01

    An improved FGS (Fine Granular Scalability) coding method is proposed in this letter, which is based on human visual characteristics. This method adjusts FGS coding frame rate according to the evaluation of video sequences so as to improve the coding efficiency and subject perceived quality of reconstructed images. Finally, a fine granular joint source channel coding is proposed based on the source coding method, which not only utilizes the network resources efficiently, but guarantees the reliable transmission of video information.

  9. Breast Reconstruction with Microvascular

    David W. Chang

    2012-01-01

    Full Text Available The free muscle-sparing transverse rectus abdominis myocutaneous (MS-TRAM and deepinferior epigastric perforator (DIEP flaps involve transferring skin and subcutaneous tissuefrom the lower abdominal area and have many features that make them well suited forbreast reconstruction. The robust blood supply of the free flap reduces the risk of fat necrosisand also enables aggressive shaping of the flap for breast reconstruction to optimize theaesthetic outcome. In addition, the free MS-TRAM flap and DIEP flap require minimal donorsitesacrifice in most cases. With proper patient selection and safe surgical technique, the freeMS-TRAM flap and DIEP flap can transfer the lower abdominal skin and subcutaneous tissueto provide an aesthetically pleasing breast reconstruction with minimal donor-site morbidity.

  10. Reconstructing random media

    We formulate a procedure to reconstruct the structure of general random heterogeneous media from limited morphological information by extending the methodology of Rintoul and Torquato [J. Colloid Interface Sci. 186, 467 (1997)] developed for dispersions. The procedure has the advantages that it is simple to implement and generally applicable to multidimensional, multiphase, and anisotropic structures. Furthermore, an extremely useful feature is that it can incorporate any type and number of correlation functions in order to provide as much morphological information as is necessary for accurate reconstruction. We consider a variety of one- and two-dimensional reconstructions, including periodic and random arrays of rods, various distribution of disks, Debye random media, and a Fontainebleau sandstone sample. We also use our algorithm to construct heterogeneous media from specified hypothetical correlation functions, including an exponentially damped, oscillating function as well as physically unrealizable ones. copyright 1998 The American Physical Society

  11. Reconstructed Jets at RHIC

    Salur, Sevil

    2010-01-01

    To precisely measure jets over a large background such as pile up in high luminosity p+p collisions at LHC, a new generation of jet reconstruction algorithms is developed. These algorithms are also applicable to reconstruct jets in the heavy ion environment where large event multiplicities are produced. Energy loss in the medium created in heavy ion collisions are already observed indirectly via inclusive hadron distributions and di-hadron correlations. Jets can be used to study this energy loss in detail with reduced biases. We review the latest results on jet-medium interactions as seen in A+A collisions at RHIC, focusing on the recent progress on jet reconstruction in heavy ion collisions.

  12. Population exposure dose reconstruction for the Urals Region

    This presentation describes the first preliminary results of an ongoing joint Russian-US pilot feasibility study. Many people participated in workshops to determine what Russian and United States scientists could do together in the area of dose reconstruction in the Urals population. Most of the results presented here came from a joint work shop in St. Petersburg, Russia (11-13 July 1995). The Russians at the workshop represented the Urals Research Center for Radiation Medicine (URCRM), the Mayak Industrial Association, and Branch One of the Moscow Biophysics Institute. The US Collaborators were Dr. Anspaugh of LLNL, Dr. Nippier of PNL, and Dr. Bouville of the National Cancer Institute. The objective of the first year of collaboration was to look at the source term and levels of radiation contamination, the historical data available, and the results of previous work carried out by Russian scientists, and to determine a conceptual model for dose reconstruction

  13. Vertex Reconstruction in CMS

    Chabanat, E; D'Hondt, J; Vanlaer, P; Prokofiev, K; Speer, T; Frühwirth, R; Waltenberger, W

    2005-01-01

    Because of the high track multiplicity in the final states expected in proton collisions at the LHC experiments, novel vertex reconstruction algorithms are required. The vertex reconstruction problem can be decomposed into a pattern recognition problem ("vertex finding") and an estimation problem ("vertex fitting"). Starting from least-square methods, ways to render the classical algorithms more robust are discussed and the statistical properties of the novel methods are shown. A whole set of different approaches for the vertex finding problem is presented and compared in relevant physics channels.

  14. The evolving breast reconstruction

    Thomsen, Jørn Bo; Gunnarsson, Gudjon Leifur

    2014-01-01

    The aim of this editorial is to give an update on the use of the propeller thoracodorsal artery perforator flap (TAP/TDAP-flap) within the field of breast reconstruction. The TAP-flap can be dissected by a combined use of a monopolar cautery and a scalpel. Microsurgical instruments are generally...... not needed. The propeller TAP-flap can be designed in different ways, three of these have been published: (I) an oblique upwards design; (II) a horizontal design; (III) an oblique downward design. The latissimus dorsi-flap is a good and reliable option for breast reconstruction, but has been...

  15. Reconstruction of inflation models

    Myrzakulov, Ratbay; Sebastiani, Lorenzo [Eurasian National University, Department of General and Theoretical Physics and Eurasian Center for Theoretical Physics, Astana (Kazakhstan); Zerbini, Sergio [Universita di Trento, Dipartimento di Fisica, Trento (Italy); TIFPA, Istituto Nazionale di Fisica Nucleare, Trento (Italy)

    2015-05-15

    In this paper, we reconstruct viable inflationary models by starting from spectral index and tensor-to-scalar ratio from Planck observations. We analyze three different kinds of models: scalar field theories, fluid cosmology, and f(R)-modified gravity. We recover the well-known R{sup 2} inflation in Jordan-frame and Einstein-frame representation, the massive scalar inflaton models and two models of inhomogeneous fluid. A model of R{sup 2} correction to Einstein's gravity plus a ''cosmological constant'' with an exact solution for early-time acceleration is reconstructed. (orig.)

  16. Imaging the temporomandibular joint

    Katzberg, R.W.; Manzione, J.V.; Westesson, P.L.

    1988-01-01

    This book encompasses all imaging modalities as they apply to the Temporomandibular Joint and its disorders. The volume employs correlative line drawings to elaborate on diagnostic images. It helps teach methods of TMJ imaging and describes findings identified by different imaging modalities to both radiologists and dental clinicians.

  17. Imaging the temporomandibular joint

    This book encompasses all imaging modalities as they apply to the Temporomandibular Joint and its disorders. The volume employs correlative line drawings to elaborate on diagnostic images. It helps teach methods of TMJ imaging and describes findings identified by different imaging modalities to both radiologists and dental clinicians

  18. Temporomandibular joint imaging

    The temporomandibular joint (TMJ) though close to the surface is one of the most difficult structures to visualise effectively. This is mainly due to the presence of dense bony structures which become superimposed over the image of the joint. The need to visualise this anatomical area is on the increase as more and more patients actively seek treatment for problems related to, and associated with, the craniomandibular articulation. Conventional radiographic techniques used to evaluate the joint have been designed to cope with the unique combination of hard and soft tissues and airspaces found in the maxillofacial region, but still have limitations. With the advent of the space age with its new materials, silicon chips and microcomputers, radiography has given way to diagnostic imaging which covers a range of modalities such as computerised tomography, magnetic resonance imaging, ultrasound and thermography. These are now available to assist in obtaining a clearer picture of the internal structures of the TMJ without the problems of superimposition previously encountered. This article is a resume of the radiographic techniques and a review of the current imaging methods available for assessing disorders of the temporomandibular joint. 21 refs., 3 tabs., 14 figs

  19. Keyed shear joints

    Hansen, Klaus

    This report gives a summary of the present information on the behaviour of vertical keyed shear joints in large panel structures. An attemp is made to outline the implications which this information might have on the analysis and design of a complete wall. The publications also gives a short...

  20. The point-source method for 3D reconstructions for the Helmholtz and Maxwell equations

    Ben Hassen, M. F.; Erhard, K.; Potthast, R.

    2006-02-01

    We use the point-source method (PSM) to reconstruct a scattered field from its associated far field pattern. The reconstruction scheme is described and numerical results are presented for three-dimensional acoustic and electromagnetic scattering problems. We give new proofs of the algorithms, based on the Green and Stratton-Chu formulae, which are more general than with the former use of the reciprocity relation. This allows us to handle the case of limited aperture data and arbitrary incident fields. Both for 3D acoustics and electromagnetics, numerical reconstructions of the field for different settings and with noisy data are shown. For shape reconstruction in acoustics, we develop an appropriate strategy to identify areas with good reconstruction quality and combine different such regions into one joint function. Then, we show how shapes of unknown sound-soft scatterers are found as level curves of the total reconstructed field.

  1. An analysis of a joint shear model for jointed media with orthogonal joint sets

    This report describes a joint shear model used in conjunction with a computational model for jointed media with orthogonal joint sets. The joint shear model allows nonlinear behavior for both joint sets. Because nonlinear behavior is allowed for both joint sets, a great many cases must be considered to fully describe the joint shear behavior of the jointed medium. An extensive set of equations is required to describe the joint shear stress and slip displacements that can occur for all the various cases. This report examines possible methods for simplifying this set of equations so that the model can be implemented efficiently form a computational standpoint. The shear model must be examined carefully to obtain a computationally efficient implementation that does not lead to numerical problems. The application to fractures in rock is discussed. 5 refs., 4 figs

  2. Kinematic analysis of the knee joint by cine MRI

    In order to obtain the MR imaging of a moving knee joint, we developed a drive system of the knee. A reciprocating reversible motor with a rope and pulleys drove a knee brace with the knee bending and extending every two seconds. Using photo sensor probe for gating cine acquisition, we got 16-time frames/cycle MR images. Such as articular cartilage, ligaments and synovial fluid, the fine components of a moving knee joint were clearly seen. In a dynamic display, these cine images demonstrated 'actual' movement of the knee joint. Moving joint fluid and defect of anterior cruciate ligament were demonstrated in the case of knee injury. These findings were not seen on static images. Cine MR imaging was also helpful for evaluating the chronic joint disease and ligament reconstruction. Through the use of the present drive system and cine acquisition, dynamic MR imaging of a moving knee joint is clearly demonstrated and it may provide useful information in the kinematic analysis of the normal and pathologic knee. (author)

  3. Progression of stifle osteoarthrosis following reconstruction of the cranial cruciate ligament in 21 dogs

    Twenty-one dogs that had intraarticular reconstruction of the cranial cruciate ligament were examined clinically and radiographically to assess limb function and determine if there had been progression of osteoarthrosis in the affected stifle joints. The interval between surgery and follow-up examination varied from 1 to 47 months, mean = 14.9 +/-12.9 months standard deviation. Clinical variables that were assessed included lameness, palpable joint instability, articular crepitus, and joint swelling. Radiographic features that were evaluated included soft-tissue swelling/joint effusion, subchondral sclerosis, periarticular osteophyte and enthesiophyte formation, remodeling of femoral and tibial condyles, and resorptive changes in the intercondyloid fossa. The owners of all 21 dogs believed that the operation had improved their dog's condition because the frequency of lameness had decreased. However, palpable instability, crepitus, and joint swelling were detected frequently during physical examinations. Radiographs documented progression of osteoarthrosis in the operated upon stifle joints of all 21 dogs

  4. Surgical Ventricular Reconstruction

    Full Text Available ... VENTRICULAR RECONSTRUCTION MONTEFIORE-EINSTEIN HEART CENTER NEW YORK CITY, NEW YORK February 13, 2008 00:00:09 ... the Montefiore-Einstein Heart Center in New York City. In just moments, you'll see an expert ...

  5. Joint Infection (Beyond the Basics)

    ... for some deep joints (eg, hip, shoulder), surgical placement of a drainage tube. ARTIFICIAL JOINT INFECTION — People ... medications, the user is advised to check the product information sheet accompanying each drug to verify conditions ...

  6. Joint cumulants for natural independence

    Hasebe, Takahiro; Saigo, Hayato

    2011-01-01

    Many kinds of independence have been defined in non-commutative probability theory. Natural independence is an important class of independence; this class consists of five independences (tensor, free, Boolean, monotone and anti-monotone ones). In the present paper, a unified treatment of joint cumulants is introduced for natural independence. The way we define joint cumulants enables us not only to find the monotone joint cumulants but also to give a new characterization of joint cumulants fo...

  7. Sustainability of Forefoot Reconstruction for the Rheumatoid Foot.

    Whitt, Kathie J; Rincker, Sarah A; Hyer, Christopher F

    2016-01-01

    Ninety percent of patients with rheumatoid arthritis will display foot and ankle pathologic features, including hallux valgus, lesser metatarsophalangeal (MTP) joint subluxation/dislocation, and hammertoe deformity. Recently, a trend has ensued toward joint preservation with distal metatarsal osteotomies and various bunion corrective procedures. However, the reference standard remains first MTP joint fusion, lesser metatarsal head resection, and lesser proximal interphalangeal joint fusion. The present retrospective study followed the results of 4 different surgeons who had performed the reference standard rheumatoid forefoot reconstruction from August 2008 to August 2012 on patients with rheumatoid arthritis. Radiographic and statistical analysis of the data from 20 patients determined an overall first MTP joint fusion rate of 90%, often occurring by 108 (range 64 to 202) days postoperatively. Radiographic nonunion occurred in 2 of the 20 patients (10%), although both were asymptomatic, with no revision necessary. Lesser digit deformity revision occurred in 1 patient (5%), and mild to moderate infection developed in 4 patients (20%). The radiographic and clinical follow-up period was 12 months. Our study found that this technique provides exceptional radiographic improvement, an acceptable time to fusion, a low reoperation rate, and minimal complications. In addition, correction of the deformity was maintained at 1 year postoperatively. In conclusion, first MTP joint fusion with lesser metatarsal head resection should remain the reference standard for surgical intervention of the rheumatoid foot. PMID:26970909

  8. MR evaluation of the knee following anterior cruciate ligament reconstruction

    This paper evaluates the role of MR imaging of the knee after anterior cruciate ligament (ACL) reconstruction. Seventy-five MR examinations were performed in 52 patients following ACL reconstruction with patellar tendon autografts. MR imaging demonstrated a well-defined autograft in 63 of 70 clinically stable autografts. Of 5 clinically lax reconstructions, none appeared will defined on MR images. Compared with the clinical examination, MR imaging was 90.7% accurate. MR imaging demonstrated time-related healing of the patellar tendon donor site, with persistent thickening indicative of tendinitis. Positions of the femoral and tibial bone tunnels could be assessed. Knee joint effusions tended to resolve completely within 7 months after operations, with the presence and degree of effusion in the earlier postoperative interval being unrelated to the clinical outcome. Ancillary disorders in the knee, such as meniscal tears and osteochondral defects, could also be evaluated in this postoperative population

  9. ARTHROSCOPIC RECONSTRUCTION OF ANTERIO R CRUCIATE LIGAMENT TEARS: OUR EXPERIENCE

    Thimma Reddy

    2015-09-01

    Full Text Available BACKGROUND: Anterior knee instability associated with rupture of the ACL (Anterior Cruciate Ligament is a disabling clinical problem. The ACL has a poor capacity for intrinsic repair. Thus for patients who have knee symptoms related to ACL deficiency, one may consider ligament reconstruction as a means of stabilizing the T ibio - F emoral articulation and restoring high level function of the knee joint. Arthroscopically assisted ACLR ( ACL Reconstruction has the advantage of being minimally invasive, accurate graft placement, less disturbance of normal tissue resulting in quicker recovery and rehabilitation, minimal hospital stay and very less infection rate. MATERIAL AND METHODS: Between April 2012 to May 2013, 30 patients who underwent arthroscopic assisted ACL reconstructions using either bone - patellar tendon - bone auto graft ( BTB or Quadrupled hamstring auto graft ( QHG or Quadriceps tendon graft ( QTG in the Department of Orthopaedics and Traumatology, Osmania Medical College, Hyderabad, Andhra Pradesh is the material in our study. CONCLUSIONS : Arthroscopic reconstruction of Anterior Cruciate Ligament is a reliable, safe procedure. It helps in the early restoration of function and stability of the Knee joint and helps the patient to get back to his normal activity much earlier than with the traditional open surgical methods. The choice of the graft does not play a major role in the function of the knee in the long run.

  10. PET image reconstruction: mean, variance, and optimal minimax criterion

    Liu, Huafeng; Gao, Fei; Guo, Min; Xue, Liying; Nie, Jing; Shi, Pengcheng

    2015-04-01

    Given the noise nature of positron emission tomography (PET) measurements, it is critical to know the image quality and reliability as well as expected radioactivity map (mean image) for both qualitative interpretation and quantitative analysis. While existing efforts have often been devoted to providing only the reconstructed mean image, we present a unified framework for joint estimation of the mean and corresponding variance of the radioactivity map based on an efficient optimal min-max criterion. The proposed framework formulates the PET image reconstruction problem to be a transformation from system uncertainties to estimation errors, where the minimax criterion is adopted to minimize the estimation errors with possibly maximized system uncertainties. The estimation errors, in the form of a covariance matrix, express the measurement uncertainties in a complete way. The framework is then optimized by ∞-norm optimization and solved with the corresponding H∞ filter. Unlike conventional statistical reconstruction algorithms, that rely on the statistical modeling methods of the measurement data or noise, the proposed joint estimation stands from the point of view of signal energies and can handle from imperfect statistical assumptions to even no a priori statistical assumptions. The performance and accuracy of reconstructed mean and variance images are validated using Monte Carlo simulations. Experiments on phantom scans with a small animal PET scanner and real patient scans are also conducted for assessment of clinical potential.

  11. Breast Reconstruction with Tissue Expansion

    Full Text Available ... planning to do a left breast reconstruction, so lift up the flaps here and go underneath the ... breast reconstruction. In this case, we would usually lift the skin flap and the pectoralis major muscle ...

  12. Comparison of functional outcomes of two anterior cruciate ligament reconstruction methods with hamstring tendon graft

    Yosmaoglu, Hayri Baran; Baltaci, Gul; Kaya, Defne; Ozer, Hamza; Atay, Ahmet

    2011-01-01

    Objective: The aim of this study was to compare the effects of Endobutton post-fixation and femoral (TransFix) transfixation in ACL reconstruction on lower extremity muscle strength, joint position sense, and knee stability. Methods: Subjects who had undergone ACL reconstruction with hamstring tendon using Endobutton post-fixation (n=20, mean age: 26.5 years) or femoral transfixation (n=20, mean age: 29.9 years) were recruited to an ACL rehabilitation program. Twelve months after surgery,...

  13. Chapter 17. Bone joints

    The use of radioisotopes for exploration of the joints and treatment of articular diseases is examined. The joint socket is explored by arthroscintigraphy, a technique applied on a routine basis only to the knee and performed by intra-articular injection of a sup(99m)Tc-labelled colloid. Arthroscintigraphy can be used especially to foresee and to check the distribution of radioactive products employed by synoviortheses (treatment by local injection). Synovial explorations are carried out by iodine 131 - or technetium-99m-labelled albumine and the pertechnetate ion which, injected intraveinously, build up in the inflamed synovial membrane to an extent increasing with the degree of inflammation. The exploration in both qualitative and quantitative. The methode, which uses a conventional scintigraph or a scintillation camera, is described. The treatments discussed are of both the local and general type

  14. JET Joint Undertaking

    The paper presents the annual report of the Joint European Torus (JET) Joint Undertaking, 1986. The report is divided into two parts: a part on the scientific and technical programme of the project, and a part setting out the administration and organisation of the Project. The first part includes: a summary of the main features of the JET apparatus, the JET experimental programme, the position of the Project in the overall Euratom programme, and how JET relates to other large fusion devices throughout the world. In addition, the technical status of JET is described, as well as the results of the JET operations in 1986. The final section of the first part outlines the proposed future programme of JET. (U.K.)

  15. Joint International Accelerator School

    CERN Accelerator School

    2014-01-01

    The CERN and US Particle Accelerator Schools recently organised a Joint International Accelerator School on Beam Loss and Accelerator Protection, held at the Hyatt Regency Hotel, Newport Beach, California, USA from 5-14 November 2014. This Joint School was the 13th in a series of such schools, which started in 1985 and also involves the accelerator communities in Japan and Russia.   Photo courtesy of Alfonse Pham, Michigan State University.   The school attracted 58 participants representing 22 different nationalities, with around half from Europe and the other half from Asia and the Americas. The programme comprised 26 lectures, each of 90 minutes, and 13 hours of case study. The students were given homework each day and had an opportunity to sit a final exam, which counted towards university credit. Feedback from the participants was extremely positive, praising the expertise and enthusiasm of the lecturers, as well as the high standard and quality of their lectures. Initial dis...

  16. A joint venturer perspective

    Many joint ventures are facing potentially huge and usually unquantifiable prospective liabilities as a consequence of the abandonment of energy and resource projects and associated reclamation obligations. It is possible for abandonment costs to be met at least partly by government or collective industry actions. There is, however, a realization amongst joint venturers that where such action has not been taken they need to enter into arrangements amongst themselves. The circumstances under which such security arrangements should be entered into and the form they should take are discussed. Aspects of security provision such as transfer of interest in the project, failure of a participant to provide the security when due and how long security agreements should continue, are also considered. (UK)

  17. Joint hypermobility syndrome pain.

    Grahame, Rodney

    2009-12-01

    Joint hypermobility syndrome (JHS) was initially defined as the occurrence of musculoskeletal symptoms in the presence of joint laxity and hypermobility in otherwise healthy individuals. It is now perceived as a commonly overlooked, underdiagnosed, multifaceted, and multisystemic heritable disorder of connective tissue (HDCT), which shares many of the phenotypic features of other HDCTs such as Marfan syndrome and Ehlers-Danlos syndrome. Whereas the additional flexibility can confer benefits in terms of mobility and agility, adverse effects of tissue laxity and fragility can give rise to clinical consequences that resonate far beyond the confines of the musculoskeletal system. There is hardly a clinical specialty to be found that is not touched in one way or another by JHS. Over the past decade, it has become evident that of all the complications that may arise in JHS, chronic pain is arguably the most menacing and difficult to treat. PMID:19889283

  18. 8th International Workshop on Boosted Object Phenomenology, Reconstruction and Searches in HEP

    2016-01-01

    BOOST2016 is the eighth of a series of successful joint theory/experiment workshops that bring together the world's leading experts from theory and LHC experiments to discuss the latest progress and develop new approaches on the reconstruction of and use of boosted decay topologies in order to search for new physics. This year, the workshop is jointly hosted by the University of Zurich and ETH Zurich.

  19. Jet Joint Undertaking

    The paper presents the Jet Joint Undertaking annual report 1987. A description is given of the JET and Euratom and International Fusion Programmes. The technical status of JET is outlined, including the development and improvements made to the system in 1987. The results of JET Operation in 1987 are described within the areas of: density effects, temperature improvements, energy confinement studies and other material effects. The contents also contain a summary of the future programme of JET. (U.K.)

  20. Responsibility and joint production

    Petersen, Thomas; Faber, Malte

    2004-01-01

    In this paper, we discuss the relationship between responsibility and joint production. Responsibility mirrors our ability to act freely. We can act freely only if we can assume responsibility for our actions and their consequences; the limits of our responsibility are therefore also the limits of our liberty (part I). Thus, a problem of responsibility arises from our partial ignorance with respect to the consequences which our actions entail. Since this ignorance is at least partly irreducib...

  1. On joint numerical radius

    Müller, Vladimír

    2014-01-01

    Roč. 142, č. 4 (2014), s. 1371-1380. ISSN 0002-9939 R&D Projects: GA ČR GA201/09/0473; GA AV ČR IAA100190903 Institutional support: RVO:67985840 Keywords : joint numerical range * numerical radius Subject RIV: BA - General Mathematics Impact factor: 0.681, year: 2014 http://www.ams.org/journals/proc/2014-142-04/S0002-9939-2014-11876-4/ home .html

  2. Nanotechnology in joint replacement

    Torrecillas, Ramón; J. S. MOYA; Díaz, L. A.; Bartolomé, J. F.; Fernández, Adolfo; Lopez-Esteban, S.

    2009-01-01

    This paper reviews the most relevant achievements and new developments in the field of nanomaterials and their possible impact on the fabrication of a new generation of reliable and longer lasting implants for joint replacement. Special emphasis is given to the role of nanocomposites with different microstructural designs: micro-nano composites, nano-nano composites, macro-micro-nano composites as well as bioinspired hierarchical composite materials. These nanostructured materials have opened...

  3. Prosthetic elbow joint

    Weddendorf, Bruce C. (Inventor)

    1994-01-01

    An artificial, manually positionable elbow joint for use in an upper extremity, above-elbow, prosthetic is described. The prosthesis provides a locking feature that is easily controlled by the wearer. The instant elbow joint is very strong and durable enough to withstand the repeated heavy loadings encountered by a wearer who works in an industrial, construction, farming, or similar environment. The elbow joint of the present invention comprises a turntable, a frame, a forearm, and a locking assembly. The frame generally includes a housing for the locking assembly and two protruding ears. The forearm includes an elongated beam having a cup-shaped cylindrical member at one end and a locking wheel having a plurality of holes along a circular arc on its other end with a central bore for pivotal attachment to the protruding ears of the frame. The locking assembly includes a collar having a central opening with a plurality of internal grooves, a plurality of internal cam members each having a chamfered surface at one end and a V-shaped slot at its other end; an elongated locking pin having a crown wheel with cam surfaces and locking lugs secured thereto; two coiled compression springs; and a flexible filament attached to one end of the elongated locking pin and extending from the locking assembly for extending and retracting the locking pin into the holes in the locking wheel to permit selective adjustment of the forearm relative to the frame. In use, the turntable is affixed to the upper arm part of the prosthetic in the conventional manner, and the cup-shaped cylindrical member on one end of the forearm is affixed to the forearm piece of the prosthetic in the conventional manner. The elbow joint is easily adjusted and locked between maximum flex and extended positions.

  4. The Joint Cities

    Romano Fistola

    2010-04-01

    Full Text Available The new connections, which high speed train allows to activate among the metropolitan systems, seem to be able to give life to new urban macro-structures for which the transfer time, among the main poles of the railway segment, becomes comparable to an inside moving into the city and therefore considered as an inter-functional mobility. The tunnel effect generated by the high speed connection seems to be able to allow a new temporal and functional joint among the metropolitan systems consequently supporting the possibility, for the users, to move themselves among the different urban functions belonging to the different cities. The birth of these urban aggregations seems to drive towards new megalopolis, which we can define for the first time with the term: joint-city. For this new metropolitan settlement it seems to be very interesting to investigate the constitutive peculiarities, the systemic articulation, its relational structures, the evolutionary scenarios, and so on. The urban functions (activities can be considered as structures of relationships between people that allows to define "organizational links" inside the community; the urban functions are located in specific places inside urban container or in open spaces. The urban functions represent the urban engines and the functional system can be thought as the “soul of the city", abstract but essential to its survival. In the definition set out here the analysis is carried out for many interconnected urban functional system points (specifically those in Rome and Naples. The new high speed railway has to be considered not only as a new channel of mobility between cities, but as a real possibility of joint between the functional systems of the two centres. A final consideration can be carried out in relation to the possibility of implementing new measures of governance of urban transformations considering the new macro-city: the "Joint City".

  5. Shoulder joint tuberculosis

    Despite the fact that joint tuberculosis is one of the most common forms of extrapulmonary tuberculosis, it is a disease entity that is very rare in Poland (less than 100 cases a year in the last 10 years). The symptoms are non-specific, and thus the disease is rarely taken into account in preliminary differential diagnosis. A 68-year-old female patient was admitted to the Internal Diseases Clinic due to oedema and pain of the right shoulder joint. The pain has been increasing for about 8 months. Physical examination revealed increased circumference and elevated temperature of the right shoulder joint. Limb function was retained. The full range of radiological and laboratory diagnostic examinations was performed, including the biopsy of the affected tissue which revealed the presence of Mycobacterium tuberculosis in the bacterial culture. Clinical improvement was obtained after introduction of TB drugs. Radiological diagnostic methods (X-ray, CT scans, MRI scans) provide high precision monitoring of articular lesions. However, the decisive diagnosis requires additional laboratory tests as well as histopathological and bacteriological assays

  6. The neuropathic joint.

    Sequeira, W

    1994-01-01

    Neuropathic arthritis is a destructive arthropathy frequently associated with loss of proprioception. A third of patients, however, may have no demonstrable neurological deficit. Patients with diabetes, syphilis, syringomyelia and other neuropathies are particularly prone to developing this joint disease. The diagnosis of Charcot's joints should be considered in anyone who develops what appears to be a severe osteoarthritis or a transverse fracture of the tibia or fibula after minor trauma. Scoliosis with particularly destructive changes on radiography should prompt a search for syringomyelia or syphilis. The most common radiographic abnormalities are those of distension in 3D (Dislocation, Destruction and Degeneration). An atrophic form with resorption of the proximal humerus, most frequently described in syringomyelia, has been observed in diabetes. Loss of the distal end of the clavicle has not been described before in the neuropathies. These changes coupled with speckled calcification or shards of bone in the periarticular soft tissue confirm the diagnosis. Infection and CPPD crystal disease can be difficult to exclude. The joint fluid may be inflammatory and infection may be a complication. Treatment includes anti-inflammatories and splinting. Indications for surgery are limited. PMID:8070170

  7. MR与CT应用于膝关节交叉韧带损伤诊治重建中的临床价值研究%Clinical Value of Application of MR and CT in Diagnosis and Treatment of the Reconstruction of the Cruciate Ligament Injury of Knee Joint

    张艳梅

    2015-01-01

    目的:探讨MR与CT 在膝关节交叉韧带损伤诊治重建中的效果。方法观察组与对照组分别采用MR、CT行膝关节交叉韧带损伤诊治重建。结果两组前后交叉韧带测量值差异无统计学意义。结论MR效果稍优于CT。%Objective To study the MR and CT in the diagnosis and treatment of knee cruciate ligament injury effect of reconstruction. Methods The observation group and control group respectively by MR, CT diagnosis and reconstruction of knee cruciate ligament damage.Results The two groups before and after the cruciate ligament there was no statistically significant difference measurements.Conclusion The MR effect was slightly superior to CT.

  8. Formation of tough composite joints

    Joints which exhibit tough fracture behavior were formed in a composite with a Si/SiC matrix reinforced with Textron SCS-6 fibers with either boron nitride or silicon nitride fiber coatings. In composites with BN coatings fibers were aligned uniaxially, while composites with Si3N4-coated fibers had a 0/90 degree architecture. Lapped joints (joints with overlapping fingers) were necessary to obtain tough behavior. Geometrical requirements necessary to avoid brittle joint failure have been proposed. Joints with a simple overlap geometry (only a few fingers) would have to be very long in order to prevent brittle failure. Typical failure in these joints is caused by a crack propagating along the interfaces between the joint fingers. Joints of the same overall length, but with geometry changed to be symmetric about the joint centerline and with an extra shear surface exhibited tough fractures accompanied with extensive fiber pullout. The initial matrix cracking of these joints was relatively low because cracks propagated easily through the ends of the fingers. Joints with an optimized stepped sawtooth geometry produced composite-like failures with the stress/strain curves containing an elastic region followed by a region of rising stress with an increase of strain. Increasing the fiber/matrix interfacial strength from 9 to 25 MPa, by changing the fiber coating, increased matrix cracking and ultimate strength of the composite significantly. The best joints had matrix cracking stress and ultimate strength of 138 and 240 MPa, respectively. Joint failure was preceded by multiple matrix cracking in the entire composite. The high strength of the joints will permit building of structures containing joints with only a minor reduction of design stresses

  9. Formation of tough composite joints

    Brun, M.K. [GE Corporate Research and Development, Schenectady, NY (United States)

    1997-05-01

    Joints which exhibit tough fracture behavior were formed in a composite with a Si/SiC matrix reinforced with Textron SCS-6 fibers with either boron nitride or silicon nitride fiber coatings. In composites with BN coatings fibers were aligned uniaxially, while composites with Si{sub 3}N{sub 4}-coated fibers had a 0/90{degree} architecture. Lapped joints (joints with overlapping fingers) were necessary to obtain tough behavior. Geometrical requirements necessary to avoid brittle joint failure have been proposed. Joints with a simple overlap geometry (only a few fingers) would have to be very long in order to prevent brittle failure. Typical failure in these joints is caused by a crack propagating along the interfaces between the joint fingers. Joints of the same overall length, but with geometry changed to be symmetric about the joint centerline and with an extra shear surface exhibited tough fractures accompanied with extensive fiber pullout. The initial matrix cracking of these joints was relatively low because cracks propagated easily through the ends of the fingers. Joints with an optimized stepped sawtooth geometry produced composite-like failures with the stress/strain curves containing an elastic region followed by a region of rising stress with an increase of strain. Increasing the fiber/matrix interfacial strength from 9 to 25 MPa, by changing the fiber coating, increased matrix cracking and ultimate strength of the composite significantly. The best joints had matrix cracking stress and ultimate strength of 138 and 240 MPa, respectively. Joint failure was preceded by multiple matrix cracking in the entire composite. The high strength of the joints will permit building of structures containing joints with only a minor reduction of design stresses.

  10. Finite element analysis of human joints

    Our work focuses on the development of finite element models (FEMs) that describe the biomechanics of human joints. Finite element modeling is becoming a standard tool in industrial applications. In highly complex problems such as those found in biomechanics research, however, the full potential of FEMs is just beginning to be explored, due to the absence of precise, high resolution medical data and the difficulties encountered in converting these enormous datasets into a form that is usable in FEMs. With increasing computing speed and memory available, it is now feasible to address these challenges. We address the first by acquiring data with a high resolution C-ray CT scanner and the latter by developing semi-automated method for generating the volumetric meshes used in the FEM. Issues related to tomographic reconstruction, volume segmentation, the use of extracted surfaces to generate volumetric hexahedral meshes, and applications of the FEM are described

  11. Tibiofemoral cartilage contact biomechanics in patients after reconstruction of a ruptured anterior cruciate ligament.

    Hosseini, Ali; Van de Velde, Samuel; Gill, Thomas J; Li, Guoan

    2012-11-01

    We investigated the in vivo cartilage contact biomechanics of the tibiofemoral joint in patients after reconstruction of a ruptured anterior cruciate ligament (ACL). A dual fluoroscopic and MR imaging technique was used to investigate the cartilage contact biomechanics of the tibiofemoral joint during in vivo weight-bearing flexion of the knee in eight patients 6 months following clinically successful reconstruction of an acute isolated ACL rupture. The location of tibiofemoral cartilage contact, size of the contact area, cartilage thickness at the contact area, and magnitude of the cartilage contact deformation of the ACL-reconstructed knees were compared with those previously measured in intact (contralateral) knees and ACL-deficient knees of the same subjects. Contact biomechanics of the tibiofemoral cartilage after ACL reconstruction were similar to those measured in intact knees. However, at lower flexion, the abnormal posterior and lateral shift of cartilage contact location to smaller regions of thinner tibial cartilage that has been described in ACL-deficient knees persisted in ACL-reconstructed knees, resulting in an increase of the magnitude of cartilage contact deformation at those flexion angles. Reconstruction of the ACL restored some of the in vivo cartilage contact biomechanics of the tibiofemoral joint to normal. Clinically, recovering anterior knee stability might be insufficient to prevent post-operative cartilage degeneration due to lack of restoration of in vivo cartilage contact biomechanics. PMID:22528687

  12. Laboratory characterization of rock joints

    A laboratory characterization of the Apache Leap tuff joints under cyclic pseudostatic and dynamic loads has been undertaken to obtain a better understanding of dynamic joint shear behavior and to generate a complete data set that can be used for validation of existing rock-joint models. Study has indicated that available methods for determining joint roughness coefficient (JRC) significantly underestimate the roughness coefficient of the Apache Leap tuff joints, that will lead to an underestimation of the joint shear strength. The results of the direct shear tests have indicated that both under cyclic pseudostatic and dynamic loadings the joint resistance upon reverse shearing is smaller than that of forward shearing and the joint dilation resulting from forward shearing recovers during reverse shearing. Within the range of variation of shearing velocity used in these tests, the shearing velocity effect on rock-joint behavior seems to be minor, and no noticeable effect on the peak joint shear strength and the joint shear strength for the reverse shearing is observed

  13. Laboratory characterization of rock joints

    Hsiung, S.M.; Kana, D.D.; Ahola, M.P.; Chowdhury, A.H.; Ghosh, A. [Southwest Research Inst., San Antonio, TX (United States). Center for Nuclear Waste Regulatory Analyses

    1994-05-01

    A laboratory characterization of the Apache Leap tuff joints under cyclic pseudostatic and dynamic loads has been undertaken to obtain a better understanding of dynamic joint shear behavior and to generate a complete data set that can be used for validation of existing rock-joint models. Study has indicated that available methods for determining joint roughness coefficient (JRC) significantly underestimate the roughness coefficient of the Apache Leap tuff joints, that will lead to an underestimation of the joint shear strength. The results of the direct shear tests have indicated that both under cyclic pseudostatic and dynamic loadings the joint resistance upon reverse shearing is smaller than that of forward shearing and the joint dilation resulting from forward shearing recovers during reverse shearing. Within the range of variation of shearing velocity used in these tests, the shearing velocity effect on rock-joint behavior seems to be minor, and no noticeable effect on the peak joint shear strength and the joint shear strength for the reverse shearing is observed.

  14. Stochastic reconstruction of sandstones

    A simulated annealing algorithm is employed to generate a stochastic model for a Berea sandstone and a Fontainebleau sandstone, with each a prescribed two-point probability function, lineal-path function, and ''pore size'' distribution function, respectively. We find that the temperature decrease of the annealing has to be rather quick to yield isotropic and percolating configurations. A comparison of simple morphological quantities indicates good agreement between the reconstructions and the original sandstones. Also, the mean survival time of a random walker in the pore space is reproduced with good accuracy. However, a more detailed investigation by means of local porosity theory shows that there may be significant differences of the geometrical connectivity between the reconstructed and the experimental samples. (c) 2000 The American Physical Society

  15. Stochastic reconstruction of sandstones

    Manwart; Torquato; Hilfer

    2000-07-01

    A simulated annealing algorithm is employed to generate a stochastic model for a Berea sandstone and a Fontainebleau sandstone, with each a prescribed two-point probability function, lineal-path function, and "pore size" distribution function, respectively. We find that the temperature decrease of the annealing has to be rather quick to yield isotropic and percolating configurations. A comparison of simple morphological quantities indicates good agreement between the reconstructions and the original sandstones. Also, the mean survival time of a random walker in the pore space is reproduced with good accuracy. However, a more detailed investigation by means of local porosity theory shows that there may be significant differences of the geometrical connectivity between the reconstructed and the experimental samples. PMID:11088546

  16. Reconstructing the Tengger calendar

    Ian Proudfoot

    2008-12-01

    Full Text Available The survival of an Indic calendar among the Tengger people of the Brama highlands in east Java opens a window on Java’s calendar history. Its hybrid form reflects accommodations between this non-Muslim Javanese group and the increasingly dominant Muslim Javanese culture. Reconstruction is challenging because of this hybridity, because of inconsistencies in practice, and because the historical evidence is sketchy and often difficult to interpret.

  17. Reconstructing the Tengger calendar

    Ian Proudfoot

    2008-01-01

    The survival of an Indic calendar among the Tengger people of the Brama highlands in east Java opens a window on Java’s calendar history. Its hybrid form reflects accommodations between this non-Muslim Javanese group and the increasingly dominant Muslim Javanese culture. Reconstruction is challenging because of this hybridity, because of inconsistencies in practice, and because the historical evidence is sketchy and often difficult to interpret.

  18. Reconstructing holographic quintessence

    Zhang, Xin

    2006-01-01

    The holographic dark energy model is an attempt for probing the nature of dark energy within the framework of quantum gravity. The dimensionless parameter $c$ determines the main property of the holographic dark energy. With the choice of $c\\geq 1$, the holographic dark energy can be described completely by a quintessence scalar field. In this paper, we show this quintessential description of the holographic dark energy with $c\\geq 1$ and reconstruct the potential of the quintessence as well ...

  19. LOFAR sparse image reconstruction

    Garsden, H.; Girard, J. N.; Starck, J. L.; Corbel, S.; Tasse, C.; Woiselle, A.; McKean, J. P.; van Amesfoort, A. S.; Anderson, J.; Avruch, I. M.; Beck, R.; Bentum, M. J.; Best, P.; Breitling, F.; Broderick, J.; Brüggen, M.; Butcher, H. R.; Ciardi, B.; de Gasperin, F.; de Geus, E.; de Vos, M.; Duscha, S.; Eislöffel, J.; Engels, D.; Falcke, H.; Fallows, R. A.; Fender, R.; Ferrari, C.; Frieswijk, W.; Garrett, M. A.; Grießmeier, J.; Gunst, A. W.; Hassall, T. E.; Heald, G.; Hoeft, M.; Hörandel, J.; van der Horst, A.; Juette, E.; Karastergiou, A.; Kondratiev, V. I.; Kramer, M.; Kuniyoshi, M.; Kuper, G.; Mann, G.; Markoff, S.; McFadden, R.; McKay-Bukowski, D.; Mulcahy, D. D.; Munk, H.; Norden, M. J.; Orru, E.; Paas, H.; Pandey-Pommier, M.; Pandey, V. N.; Pietka, G.; Pizzo, R.; Polatidis, A. G.; Renting, A.; Röttgering, H.; Rowlinson, A.; Schwarz, D.; Sluman, J.; Smirnov, O.; Stappers, B. W.; Steinmetz, M.; Stewart, A.; Swinbank, J.; Tagger, M.; Tang, Y.; Tasse, C.; Thoudam, S.; Toribio, C.; Vermeulen, R.; Vocks, C.; van Weeren, R. J.; Wijnholds, S. J.; Wise, M. W.; Wucknitz, O.; Yatawatta, S.; Zarka, P.; Zensus, A.

    2015-03-01

    Context. The LOw Frequency ARray (LOFAR) radio telescope is a giant digital phased array interferometer with multiple antennas distributed in Europe. It provides discrete sets of Fourier components of the sky brightness. Recovering the original brightness distribution with aperture synthesis forms an inverse problem that can be solved by various deconvolution and minimization methods. Aims: Recent papers have established a clear link between the discrete nature of radio interferometry measurement and the "compressed sensing" (CS) theory, which supports sparse reconstruction methods to form an image from the measured visibilities. Empowered by proximal theory, CS offers a sound framework for efficient global minimization and sparse data representation using fast algorithms. Combined with instrumental direction-dependent effects (DDE) in the scope of a real instrument, we developed and validated a new method based on this framework. Methods: We implemented a sparse reconstruction method in the standard LOFAR imaging tool and compared the photometric and resolution performance of this new imager with that of CLEAN-based methods (CLEAN and MS-CLEAN) with simulated and real LOFAR data. Results: We show that i) sparse reconstruction performs as well as CLEAN in recovering the flux of point sources; ii) performs much better on extended objects (the root mean square error is reduced by a factor of up to 10); and iii) provides a solution with an effective angular resolution 2-3 times better than the CLEAN images. Conclusions: Sparse recovery gives a correct photometry on high dynamic and wide-field images and improved realistic structures of extended sources (of simulated and real LOFAR datasets). This sparse reconstruction method is compatible with modern interferometric imagers that handle DDE corrections (A- and W-projections) required for current and future instruments such as LOFAR and SKA.

  20. Stochastic reconstruction of sandstones

    Manwart, C.; Torquato, S.; Hilfer, R.

    2000-01-01

    A simulated annealing algorithm is employed to generate a stochastic model for a Berea and a Fontainebleau sandstone with prescribed two-point probability function, lineal path function, and ``pore size'' distribution function, respectively. We find that the temperature decrease of the annealing has to be rather quick to yield isotropic and percolating configurations. A comparison of simple morphological quantities indicates good agreement between the reconstructions and the original sandston...

  1. The art of reconstruction

    Healey, Michael; Esson, Michael

    2011-01-01

    The ‘Art of Reconstruction Research Project’ is where re-skilling of plastic surgeons by artists is already in an embryonic phase. In integrating the required network of associated skills, expertise and experience, the research collaboration brings together artists within The Drawing Research Group of The Faculty of Art, Architecture and Design (AAD) and the distinguished work of Professor Mike Esson, Director, The International Drawing Research Institute (IDRI). Th...

  2. Reconstruction of vaginal agenesis.

    Ozkan, Ozlenen; Erman Akar, Münire; Ozkan, Omer; Doğan, N Utku

    2011-06-01

    Vaginal ageneses are by no means rare anomalies. Complete Mullerian agenesis is the most common reason for vaginal agenesis requiring reconstruction. Patients usually present with pain, hematocolpos, or hematometra in puberty, and later with amenorrhea and dyspareunia. Detailed information is given here regarding etiologies, timing of surgery, and current treatment options for vaginal agenesis. Outcomes and short- and long-term complications of recent treatment options are also discussed. PMID:21372677

  3. Orthotopic neobladder reconstruction

    Chang, Dwayne T. S.; Nathan Lawrentschuk

    2015-01-01

    Orthotopic neobladder reconstruction is becoming an increasingly common urinary diversion following cystectomy for bladder cancer. This is in recognition of the potential benefits of neobladder surgery over creation of an ileal conduit related to quality of life (QoL), such as avoiding the need to form a stoma with its cosmetic, psychological and other potential complications. The PubMed database was searched using relevant search terms for articles published electronically between January 19...

  4. Reconstruction for DRUJ Instability

    Lawler, Ericka; Adams, Brian D.

    2007-01-01

    The skeletal architecture of the DRUJ provides minimal inherent stability, as the sigmoid notch is shallow and its radius of curvature is 50% greater than that of the ulnar head [Af Ekenstam F, Hagert CG. Anatomical studies on the geometry and stability of the distal radio ulnar joint. Scand J Plast Reconstr Surg 1985;19(1):17–25]. Due to its incongruent articulation, the DRUJ relies strongly on the surrounding soft tissues for stability. The triangular fibrocartilage complex (TFCC) is genera...

  5. Optimized Quasi-Interpolators for Image Reconstruction.

    Sacht, Leonardo; Nehab, Diego

    2015-12-01

    We propose new quasi-interpolators for the continuous reconstruction of sampled images, combining a narrowly supported piecewise-polynomial kernel and an efficient digital filter. In other words, our quasi-interpolators fit within the generalized sampling framework and are straightforward to use. We go against standard practice and optimize for approximation quality over the entire Nyquist range, rather than focusing exclusively on the asymptotic behavior as the sample spacing goes to zero. In contrast to previous work, we jointly optimize with respect to all degrees of freedom available in both the kernel and the digital filter. We consider linear, quadratic, and cubic schemes, offering different tradeoffs between quality and computational cost. Experiments with compounded rotations and translations over a range of input images confirm that, due to the additional degrees of freedom and the more realistic objective function, our new quasi-interpolators perform better than the state of the art, at a similar computational cost. PMID:26390452

  6. Canal Wall Reconstruction Mastoidectomy

    2007-01-01

    Objective To investigate the advantages of canal wall reconstruction (CWR) mastoidectomy, a single-stage technique for cholesteatoma removal and posterior external canal wall reconstruction, over the open and closed procedures in terms of cholesteatoma recurrence. Methods: Between June 2002 and December 2005, 38 patients (40 ears) with cholesteatoma were admited to Sun Yat-Sen Memorial Hospital and received surgical treatments. Of these patients, 25 were male with ages ranging between 11 and 60 years (mean = 31.6 years) and 13 were female with ages ranging between 20 and 65 years (mean = 38.8 years). Canal wall reconstruction (CWR)mastoidectomy was performed in 31 ears and canal wall down (CWD) mastoidectomy in 9 ears. Concha cartilage was used for ear canal wall reconstruction in 22 of the 31 CWR procedures and cortical mastoid bone was used in the remaining 9 cases. Results At 0.5 to 4 years follow up, all but one patients remained free of signs of cholesteatoma recurrence, i.e., no retraction pocket or cholesteatoma matrix. One patient, a smoker, needed revision surgery due to cholesteatoma recurrence 1.5 year after the initial operation. The recurrence rate was therefore 3.2% (1/31). Cholesteatoma recurrence was monitored using postoperative CT scans whenever possible. In the case that needed a revision procedure, a retraction pocket was identified by otoendoscopy in the pars flacida area that eventually evolved into a cholesteatoma. A pocket extending to the epitympanum filled with cholesteatoma matrix was confirmed during the revision operation, A decision to perform a modified mastoidectomy was made as the patient refused to quit smoking. The mean air-bone gap in pure tone threshold was 45 dB before surgery and 25 dB after (p < 0.05). There was no difference between using concha cartilage and cortical mastoid bone for the reconstruction regarding air-bone gap improvement, CT findings and otoendoscopic results. Conclusion CWR mastoidectomy can be used for

  7. Anatomy-guided brain PET imaging incorporating a joint prior model

    We proposed a maximum a posterior (MAP) framework for incorporating information from co-registered anatomical images into PET image reconstruction through a novel anato-functional joint prior. The characteristic of the utilized hyperbolic potential function is determinate by the voxel intensity differences within the anatomical image, while the penalization is computed based on voxel intensity differences in reconstructed PET images. Using realistic simulated 18FDG PET scan data, we optimized the performance of the proposed MAP reconstruction with the joint prior (JP-MAP) and compared its performance with conventional 3D MLEM and 3D MAP reconstructions. The proposed JP-MAP reconstruction algorithm resulted in quantitatively enhanced reconstructed images, as demonstrated in extensive FDG PET simulation study. The proposed method was also tested on a 20 min Florbetapir patient study performed on the high-resolution research tomograph. It was shown to outperform conventional methods in visual as well as quantitative accuracy assessment (in terms of regional noise versus activity value performance). The JP-MAP method was also compared with another MR-guided MAP reconstruction method, utilizing the Bowsher prior and was seen to result in some quantitative enhancements, especially in the case of MR-PET mis-registrations, and a definitive improvement in computational performance. (paper)

  8. Image reconstruction from phased-array data based on multichannel blind deconvolution.

    She, Huajun; Chen, Rong-Rong; Liang, Dong; Chang, Yuchou; Ying, Leslie

    2015-11-01

    In this paper we consider image reconstruction from fully sampled multichannel phased array MRI data without knowledge of the coil sensitivities. To overcome the non-uniformity of the conventional sum-of-square reconstruction, a new framework based on multichannel blind deconvolution (MBD) is developed for joint estimation of the image function and the sensitivity functions in image domain. The proposed approach addresses the non-uniqueness of the MBD problem by exploiting the smoothness of both functions in the image domain through regularization. Results using simulation, phantom and in vivo experiments demonstrate that the reconstructions by the proposed algorithm are more uniform than those by the existing methods. PMID:26119418

  9. A Computer Vision Method for 3D Reconstruction of Curves-Marked Free-Form Surfaces

    Xiong Hanwei; Zhang Xiangwei

    2001-01-01

    Visual method is now broadly used in reverse engineering for 3D reconstruction. Thetraditional computer vision methods are feature-based, i.e., they require that the objects must revealfeatures owing to geometry or textures. For textureless free-form surfaces, dense feature points areadded artificially. In this paper, a new method is put forward combining computer vision with CAGD.The surface is subdivided into N-side Gregory patches using marked curves, and a stereo algorithm isused to reconstruct the curves. Then, the cross boundary tangent vector is computed throughreflectance analysis. At last, the whole surface can be reconstructed by jointing these patches withG1 continuity.

  10. The study of non-linear reconstruction method in digital laminography

    The inspection of flat components like soldered joints with complex structures is a very important application of non-destructive test and requires high sophisticated nondestructive testing methods. A new non-linear reconstruction method will be put forward. The object is irradiated by X-ray under different angles. After preprocessing the complete object image is reconstructed plane by plane. In comparison to computer tomography, the digital laminography is always a limited angle reconstruction. Therefore, the applied algorithm depends on the object geometry and structure as well as the requested accuracy and structure type

  11. The study of non-linear reconstruction method in the digital laminography

    The inspection of flat components like soldered joints with complex structures is a very important application of non-destructive test and requires high sophisticated nondestructive testing methods. A new nonlinear reconstruction method will be put forward. The object is irradiated by the X-rays under different angles. After preprocessing the complete object image is reconstructed plane by plane. In comparison to computer tomography, the digital laminography is always a limited angle reconstruction. Therefore, the applied algorithm depends on the object geometry and structure as well as the requested accuracy and structure type

  12. Synostosis of the proximal tibiofibular joint.

    Sferopoulos, Nikolaos K

    2010-01-01

    The incidence of synostosis of the proximal tibiofibular joint (TFJ) was assessed among 1029 patients examined for osteoarthritis of the knee in a 4-year period. Radiographic evidence of a synostosis of the proximal TFJ was demonstrated in 3 knees (3 patients). The synostosis appeared incidental and was not the cause of symptoms in any of them. These patients were further examined with MRI and/or CT scans. In two cases, which were found to be primary (idiopathic), the synostosis was complete and bony. In a third case the lesion was secondary (acquired) to surgical reconstruction for a depressed fracture of the lateral tibial plateau. This iatrogenic complication followed open reduction, internal fixation, and grafting with synthetic bone. The bridging of the joint on the CT views was partial and compatible with ectopic calcification rather than ossification. The patients were treated conservatively and were followed for an average period of 3 years. No evidence that the synostosis accelerated the onset or progression of the degenerative changes to the ipsilateral knee could be verified. PMID:20592991

  13. Joint Advisory Appeals Board

    HR Department

    2006-01-01

    The Joint Advisory Appeals Board was convened to examine an appeal lodged by a member of the personnel with regard to advancement. The person concerned has requested that the report of the Board and the final decision of the Director-General be brought to the notice of the personnel in accordance with Article R VI 1.20 of the Staff Regulations. The relevant documents will therefore be posted on the notice boards of the Administration Building (No. 60) from 24 March to 10 April 2006. Human Resources Department Tel. 74128

  14. Joint Advisory Appeals Board

    2003-01-01

    The Joint Advisory Appeals Board was convened to examine the appeal lodged by Mrs Judith Igo-Kemenes concerning the application of procedures foreseen by Administrative Circular N§ 26 (Rev. 3). As the appellant has not objected, the report of the Board and the final decision of the Director-General are brought to the notice of the personnel in accordance with Article R VI 1.20 of the Staff Regulations. The relevant documents will therefore be posted on the notice boards of the Administration Building (N° 60) from 6 to 20 June 2003. Human Resources Division Tel. 74128

  15. THE JOINT MONITORING COMMISSION

    Helmoed-Römer Heitman

    2012-02-01

    Full Text Available The Joint Monitoring Commission (JMC was created to oversee the withdrawal of South African forces from the portion of Angola's southern Cunene province in which they had operated for some time, and its re-occupation by the Angolan Armed Forces (Fapla. It was to ensure that neither Swapo nor Cuban forces moved into this area as the South African Defence Force (SADF withdrew. The JMC consisted of SADF and Fapla headquarters (HQ personnel and infantry from both armies to monitor the area concerned. It operated in southern Angola from February 1984 to May 1985.

  16. Ulnar joint synovial sarcoma

    Statement of the diagnosis of synovial sarcoma in early period on the example of one patient is analyzed. It is too difficult to diagnose synovial sarcoma. Comprehensive X-ray ultrasonic examination is the most informative in detection of tumor. Surgical removal of revealed formation has been conducted to the patient. The formation is dense, joined to muscular fibers, is not connected with the joint. Histological investigation of the formation determines dissemination of malignant tumor, presented by round or oval cells. Tumor tissue is devided by thick fibrous layers, surrounded by fibrous capsula. The following conclusion is given: synovial sarcoma

  17. Tarsometatarsal/Lisfranc joint.

    DiDomenico, Lawrence A; Cross, Davi

    2012-04-01

    Accurate early diagnosis with adequate reduction and maintenance of anatomic alignment of the dislocation or fracture within the Lisfranc joint complex have been found to be the key to successful outcomes regarding this injury. Because of the anatomic variations, the thin soft tissue envelop, and the abundance of ligamentous and capsular structures in the region, repair of these injuries can be a challenge. The classification systems used to describe these injuries aid in describing the mechanism of injury or displacement type present, which may aid in determining what treatment modality can provide the best outcome. PMID:22424486

  18. Joint Advisory Appeals Board

    2003-01-01

    The Joint Advisory Appeals Board was convened to examine the appeal lodged by Mr Poul Frandsen concerning his assimilation into the new career structure. As the appellant has not objected, the report of the Board and the final decision of the Director-General are brought to the notice of the personnel in accordance with Article R VI 1.20 of the Staff Regulations. The relevant documents will therefore be posted on the notice boards of the Administration Building (N° 60) from 13 to 24 January 2003. Human Resources Division Tel. 74128

  19. Embrittlement of welded joints

    The structure of a weld is considered and the role of the main parts of a welded joint in the appearance of defects during welding is determined. Factors greatly affecting hot crack formation (heat removal, impurity redistribution, volume of welding bath, welding rate) are shown. Reasons for the appearance of cracks not related to crystallization process (subsequent heat treatment, plastic working, etc.) are analyzed. The process of cold cracking of welds due to hydrogen absorption and relaxation of high welding stresses, is investigated. Methods to avoid cold cracking are described. Mechanisms of weld embrittlement are considered using as examples steels and high nickel alloys. 248 refs.; 28 figs.; 2 tabs

  20. Joint Advisory Appeals Board

    2013-01-01

    The Joint Advisory Appeals Board has examined the internal appeal lodged by a former member of the personnel, a beneficiary of the CERN Pension Fund, against the calculation of his pension in the framework of the Progressive Retirement Programme.   The person concerned has not objected to the report of the Board and the final decision of the Director-General being brought to the attention of the members of the personnel. In application of Article R VI 1.18 of the Staff Regulations, these documents will therefore be available from 26 July to 11 August 2013 at the following link. HR Department Head Office

  1. Optical rotary joint

    May, R. G., Jr.

    1982-06-01

    The primary objective of this contract is the design, fabrication, and testing of an optical rotary joint which permits transmission of signals through optical fibers across the interface of two environments rotating relative to each other. Outstanding optical performance is achieved through the use of gradient index lenses to couple radiation across the separation between two fibers. The salient features of this device are bidirectional operation at two wavelengths (850 nm and 1300 nm), low insertion loss, low rotationally induced variation of attenuation, a seven-circuit electrical slip-ring assembly, and rugged construction. The device is designed to facilitate the application of future designs to pressurized, subsea environments.

  2. Joint Advisory Appeals Board

    HR Department

    2008-01-01

    The Joint Advisory Appeals Board has examined the internal appeal lodged by a member of the personnel against the decision to grant him only a periodic one-step advancement for the 2006 reference year. The person concerned has not objected to the report of the Board and the final decision of the Director-General being brought to the attention of the members of the personnel. In application of Article R VI 1.18 of the Staff Regulations, these documents will therefore be posted on the notice board of the Main building (bldg. 500) from 1 September to 14 September 2008. Human Resources Department (73911)

  3. Joint Advisory Appeals Board

    HR Department

    2008-01-01

    The Joint Advisory Appeals Board has examined the internal appeal lodged by a member of the personnel against the decision to grant him only a periodic one-step advancement for the 2006 reference year. The person concerned has not objected to the report of the Board and the final decision of the Director-General being brought to the attention of the members of the personnel. In application of Article R VI 1.18 of the Staff Regulations, these documents will therefore be posted on the notice board of the Main Building (Bldg. 500) from 1 September to 14 September 2008. Human Resources Department (73911)

  4. Joint Advisory Appeals Board

    HR Department

    2007-01-01

    The Joint Advisory Appeals Board was convened to examine an internal appeal lodged by a member of the personnel with regard to the decision not to grant him an indefinite contract. The person concerned has requested that the report of the Board and the final decision of the Director-General be brought to the notice of the members of the personnel, in accordance with Article R VI 1.18 of the Staff Regulations. The relevant documents will therefore be posted on the notice board of the Main building (Bldg. 60) from 24 September to 7 October 2007. Human Resources Department

  5. Joint Advisory Appeals Board

    HR Department

    2008-01-01

    The Joint Advisory Appeals Board has examined the internal appeal lodged by a member of the personnel with regard to the decision not to award him a periodic one-step advancement for the 2006 reference year. The person concerned has not objected to the report of the Board and the final decision of the Director-General being brought to the notice of the members of the personnel. In application of Article R VI 1.18 of the Staff Regulations, these documents will therefore be posted on the notice board of the Main building (Bldg. 500) from 17 March to 30 March 2008. Human Resources Department Tel. 73911

  6. Joint Advisory Appeals Board

    HR Department

    2008-01-01

    The Joint Advisory Appeals Board has examined the internal appeal lodged by a member of the personnel with regard to the decision not to grant him an indefinite contract. The person concerned has not objected to the report of the Board and the final decision of the Director-General being brought to the notice of the members of the personnel. In application of Article R VI 1.18 of the Staff Regulations, these documents will therefore be posted on the notice board of the Main Building (Bldg. 500) from 26 May to 6 June 2008. Human Resources Department (73911)

  7. Joint Advisory Appeals Board

    HR Department

    2008-01-01

    The Joint Advisory Appeals Board was convened to examine an internal appeal lodged by a member of the personnel with regard to the decision not to grant him an indefinite contract. The person concerned has not objected to the report of the Board and the final decision of the Director-General being brought to the notice of the members of the personnel, in accordance with Article R VI 1.18 of the Staff Regulations. These documents will therefore be posted on the notice board of the Main Building (Bldg. 60) from 21 January to 3 February 2008. Human Resources Department (73911)

  8. Joint Advisory Appeals Board

    2003-01-01

    The Joint Advisory Appeals Board was convened to examine the appeal lodged by Mr Aloïs Girardoz with regard to classification and advancement. As the appellant has not objected, the Board's report and the Director-General's decision will be brought to the notice of the personnel in accordance with Article R VI 1.20 of the Staff Regulations. The relevant documents will therefore be posted on the notice boards of the Administration Building (N° 60) from 15 to 29 August 2003. Human Resources Division Tel. 74128

  9. Lisfranc Joint Injuries

    Lisa Chinn

    2009-01-01

    @@ The ankle and foot are the most common sites for athletic injuries.[1]Midfoot,or Lisfranc,injuries are the second most common foot injury and have a high in cidence in particular sports.They account for 4% of all football injuries per year,occurring frequently in linemen.[2]They are also common in equestrians,surfers,and windsurfers.[2]Lisfranc injuries are often misdiagnosed and if not treated properly can have lingering symptoms.It is estimated that Lisfranc joint injuries occur in 1 in every 55,000 persons every year.[3,4

  10. Surgical reconstruction in diabetic foot syndrome

    Umid Shoyusupov

    2011-04-01

    Full Text Available Considerable morbidity upon spontaneous wound healing (phlegmons, osteomyelitis, and purulent osteoarthritis of metatarsophalangeal joint as well as loss of the diseased foot’s walking ability are among the reasons for transition to plastic surgery in management tactics. The longer foot lesion persists, the higher probability of amputation. Improvement of treatment of both wound and ulcer lesions by means of reconstructive surgery in patients with diabetic foot syndrome was the main aim of the study. Outcomes of treatment of 460 patients managed at the Center for the Scientific and Clinical Study of Endocrinology, within the period from 2001 to 2009 were analyzed. Size, form, depth and localization of a wound, tissue composition of the wound bed as well as circulation in skin flaps caused the choice of specific operation: autodermoplasty by Parin (with the split-thickness skin flap, local tissue plastic operation (with the sliding or inter-advancing skin flaps, flaps from previously amputated toe or Indian flaps, plastic operation with the controlled tissue tension or combined plastic operation. Reconstructive foot wound surgery allows restoring load-bearing function of the extremity much earlier in contrast to spontaneous healing, reducing incidence of post-operative and long-term complications, amputations and re-amputations, decreasing period of treatment.

  11. Jointly Sponsored Research Program

    Everett A. Sondreal; John G. Hendrikson; Thomas A. Erickson

    2009-03-31

    U.S. Department of Energy (DOE) Cooperative Agreement DE-FC26-98FT40321 funded through the Office of Fossil Energy and administered at the National Energy Technology Laboratory (NETL) supported the performance of a Jointly Sponsored Research Program (JSRP) at the Energy & Environmental Research Center (EERC) with a minimum 50% nonfederal cost share to assist industry in commercializing and effectively applying highly efficient, nonpolluting energy systems that meet the nation's requirements for clean fuels, chemicals, and electricity in the 21st century. The EERC in partnership with its nonfederal partners jointly performed 131 JSRP projects for which the total DOE cost share was $22,716,634 (38%) and the nonfederal share was $36,776,573 (62%). Summaries of these projects are presented in this report for six program areas: (1) resource characterization and waste management, (2) air quality assessment and control, (3) advanced power systems, (4) advanced fuel forms, (5) value-added coproducts, and (6) advanced materials. The work performed under this agreement addressed DOE goals for reductions in CO{sub 2} emissions through efficiency, capture, and sequestration; near-zero emissions from highly efficient coal-fired power plants; environmental control capabilities for SO{sub 2}, NO{sub x}, fine respirable particulate (PM{sub 2.5}), and mercury; alternative transportation fuels including liquid synfuels and hydrogen; and synergistic integration of fossil and renewable resources.

  12. Thumb Carpometacarpal Joint Stabilization in Ehlers-Danlos Syndrome--Case Report.

    Breahna, Anca Nicoleta; Meads, Bryce Maurice

    2015-10-01

    We report the case of an 18-years-old patient with thumb carpometacarpal ligament laxity due to Ehlers-Danlos syndrome who was treated with trapezial opening wedge osteotomy combined with volar ligaments reconstruction. Two years postoperatively she is pain free and the thumb carpometacarpal joint is stable. PMID:26388011

  13. Infections after reconstructions of anterior cruciate ligament

    Ristić Vladimir

    2014-01-01

    Full Text Available Introduction. Infections after anterior cruciate ligament reconstructions are rare, but, on the other hand, they are difficult to be treated. The aim of this study was to analyze causes of infections, risk factors, diagnostics, and possibilities of their prevention. Material and Methods. Seventeen deep infections (1.2% were found in 1425 patients who had undergone anterior cruciate ligament reconstructions. Fifteen patients were males and two were females. Out of 475 professional athletes nine (1.9% had this postoperative complication. Eleven patients with septic arthritis were allergic to penicillin. Three of them had immunosuppressive diseases. Results. Staphylococcus aureus was isolated in eleven cases (65%, other Staphylococcus and Streptococcus groups were found in four and three patients, respectively; while one patient had infection although the punctate was negative. Out of 965 patients with the patellar tendon grafts, ten (1.03% had this complication, while the incidence was 1.52% (7/460 in those with the hamstring grafts. Fifteen infections were acute with obvious symptoms within 14 days after surgery. Severe pain, limited range of motion, swelling of the knee joint and fever were the most common symptoms, while rubor and pus developed rarely. The infection was three times more frequent in the patients who had undergone surgery lasting more than 1.5 hour. Discussion and Conclusion. The following population groups are at risk of developing septic arthritis after anterior cruciate ligament reconstructions: professional athletes, those who are allergic to penicillin, and those with immunosuppressive diseases. Staphyllococus aureus is the most common cause of infection. The patients with the hamstring autografts have a higher risk than those with the patellar tendon grafts. Preventive measures that should be performed include aseptic conditions in operative rooms, irrigation of the graft before its placement into the bone tunnels

  14. On Stack Reconstruction Problem

    V. D. Аkeliev

    2014-06-01

    Full Text Available The paper describes analytical investigations that study relation of fuel combustion regimes with concentration values of sulphur anhydride in flue gases and acid dew point. Coefficients of convective heat transfer at internal and external surfaces of stacks have been determined in the paper. The paper reveals the possibility to reconstruct stacks while using gas discharging channel made of composite material on the basis of glass-reinforced plastic which permits to reduce thermo-stressed actions on reinforced concrete and increase volume of released gases due to practically two-fold reduction of gas-dynamic pressure losses along the pipe length.

  15. Evolutionary tree reconstruction

    Cheeseman, Peter; Kanefsky, Bob

    1990-01-01

    It is described how Minimum Description Length (MDL) can be applied to the problem of DNA and protein evolutionary tree reconstruction. If there is a set of mutations that transform a common ancestor into a set of the known sequences, and this description is shorter than the information to encode the known sequences directly, then strong evidence for an evolutionary relationship has been found. A heuristic algorithm is described that searches for the simplest tree (smallest MDL) that finds close to optimal trees on the test data. Various ways of extending the MDL theory to more complex evolutionary relationships are discussed.

  16. Ball-joint grounding ring

    Aperlo, P. J. A.; Buck, P. A.; Weldon, V. A.

    1981-01-01

    In ball and socket joint where electrical insulator such as polytetrafluoroethylene is used as line to minimize friction, good electrical contact across joint may be needed for lightning protection or to prevent static-charge build-up. Electrical contact is maintained by ring of spring-loaded fingers mounted in socket. It may be useful in industry for cranes, trailers, and other applications requiring ball and socket joint.

  17. Goniometry in limited joint mobility

    Gopinath, S.; Manoj, K.; Rubiya

    2012-01-01

    Aim: To study about the utility of goniometry in screening for limited joint mobility (LJM) in patients attending a secondary level Diabetic Clinic. Materials and Methods: Randomly selected data of 100 patients attending a secondary level diabetic clinic without any complications were used. Baseline neuropathy assessments, namely monofilament and biothesiometry were done. Range of movement around the ankle joint and 1 st metatarsal joint was done using goniometry. Both the results were compar...

  18. The Challenges of Joint Attention

    Kaplan, Frederic; Hafner, Verena

    2004-01-01

    This paper discusses the concept of joint attention and the different skills underlying its development. We argue that joint attention is much more than gaze following or simultaneous looking because it implies a shared intentional relation to the world. The current state-of-the-art in robotic and computational models of the different prerequisites of joint attention is discussed in relation with a developmental timeline drawn from results in child studies.

  19. Joint audits - benefit or burden?

    Holm, Claus; Thinggaard, Frank

    audits to be a net burden. Furthermore, based on DeAngelo's (1981) initial audit pricing model and legislators' claim that joint audits are an unnecessary economic burden to the companies we predict and find discounts (of around 25%) in audit fees in companies that change to single audits. The primary...... joint audit regime to a single auditor/voluntary joint audit regime. The dataset used in this paper has been collected for the full population of non-financial Danish companies listed on the Copenhagen Stock Exchange (CSE) in the years 2004 and 2005. We find that a majority of firms perceive joint...

  20. Non-microsurgical breast reconstruction

    Sharma Sheel

    2007-12-01

    Full Text Available Breast reconstruction after mastectomy should aim at resulting in an aesthetic outcome that matches the patient′s expectations and without interfering in the oncologic treatment. Whether the reconstruction is performed immediately or in a delayed fashion depends on various factors, which needs detailed attention. Autologous tissue, implants or both are used in the reconstruction. This article reviews the current concepts in these, with emphasis on non-microsurgical methods of using the autologous tissue for reconstruction. Breast conservation has become an accepted practice of treatment. Reconstruction in these situations as well as in an occasion when the surgery is done for failed breast conservation is discussed in detail. The article also reviews the various methods for nipple reconstruction available.

  1. Biomaterials for craniofacial reconstruction

    Neumann, Andreas

    2009-01-01

    Full Text Available Biomaterials for reconstruction of bony defects of the skull comprise of osteosynthetic materials applied after osteotomies or traumatic fractures and materials to fill bony defects which result from malformation, trauma or tumor resections. Other applications concern functional augmentations for dental implants or aesthetic augmentations in the facial region.For ostheosynthesis, mini- and microplates made from titanium alloys provide major advantages concerning biocompatibility, stability and individual fitting to the implant bed. The necessity of removing asymptomatic plates and screws after fracture healing is still a controversial issue. Risks and costs of secondary surgery for removal face a low rate of complications (due to corrosion products when the material remains in situ. Resorbable osteosynthesis systems have similar mechanical stability and are especially useful in the growing skull.The huge variety of biomaterials for the reconstruction of bony defects makes it difficult to decide which material is adequate for which indication and for which site. The optimal biomaterial that meets every requirement (e.g. biocompatibility, stability, intraoperative fitting, product safety, low costs etc. does not exist. The different material types are (autogenic bone and many alloplastics such as metals (mainly titanium, ceramics, plastics and composites. Future developments aim to improve physical and biological properties, especially regarding surface interactions. To date, tissue engineered bone is far from routine clinical application.

  2. LHCb; LHCb Jet Reconstruction

    Augusto, O

    2012-01-01

    The Large Hadron Collider (LHC) is the most powerful particle accelerator in the world. It has been designed to collide proton beams at an energy up to 14 TeV in the center of mass. In 2011, the data taking was done with a center of mass energy of 7 TeV, the instant luminosity has reached values greater than $4 \\times 10^{32} cm^{-2} s^{-1}$ and the integrated luminosity reached the value of 1.02 $fb^{-1}$ on the LHCb. The jet reconstruction is fundamental to observe events that can be used to test pertubative QCD (pQCD). It also provides a way to observe standard model channels and searches for new physics like SUSY. The anti-kt algorithm is a jet reconstruction algorithm that is based on the distance of the particles on the space $\\eta \\times \\phi$ and on the transverse momentum of particles. To maximize the energy resolution all information about the trackers and the calo...

  3. Delayed breast implant reconstruction

    Hvilsom, Gitte B.; Hölmich, Lisbet R.; Steding-Jessen, Marianne;

    2012-01-01

    We evaluated the association between radiation therapy and severe capsular contracture or reoperation after 717 delayed breast implant reconstruction procedures (288 1- and 429 2-stage procedures) identified in the prospective database of the Danish Registry for Plastic Surgery of the Breast during...... the period between 1999 and 2006. A history of radiation therapy was associated with increased risk of severe capsular contracture for 1- and 2-stage procedures, with adjusted hazard ratios (HR) of 3.3 (95% confidence interval [CI]: 0.9-12.4) and 7.2 (95% CI: 2.4-21.4), respectively. Similarly, a...... history of radiation therapy was associated with a non-significantly increased risk of reoperation after both 1-stage (HR = 1.4; 95% CI: 0.7-2.5) and 2-stage (HR = 1.6; 95% CI: 0.9-3.1) procedures. Reconstruction failure was highest (13.2%) in the 2-stage procedures with a history of radiation therapy...

  4. Reconstructing Experiences through Sketching

    Karapanos, Evangelos; Hassenzahl, Marc

    2009-01-01

    This paper presents iScale, a survey tool that aims at eliciting users' experiences with a product from memory. iScale employs sketching in imposing a process in the reconstruction of one's experiences. Two versions of iScale, the Constructive and the Value-Account iScale, were motivated by two distinct theories on how people reconstruct emotional experiences from memory. These two versions were tested in two separate studies. Study 1 aimed at providing qualitative insight into the use of iScale and compared its performance to that of free-hand sketching. Study 2 compared the two iScale versions to a control condition: that of reporting one's experiences without employing any form of sketching. Significant differences between iScale and the "no-sketching" tool were found. Overall, iScale resulted in a) an increase in the number of experience reports that subjects provided, b) an increase in the amount of contextual information for the reported experiences, and c) an increase in subjects' accuracy in recalling...

  5. Three-dimensional ICT reconstruction

    The three-dimensional ICT reconstruction method is the hot topic of recent ICT technology research. In the context, qualified visual three-dimensional ICT pictures are achieved through multi-piece two-dimensional images accumulation by, combining with thresholding method and linear interpolation. Different direction and different position images of the reconstructed pictures are got by rotation and interception respectively. The convenient and quick method is significantly instructive to more complicated three-dimensional reconstruction of ICT images. (authors)

  6. Phase Retrieval Versus Phaseless Reconstruction

    Botelho-Andrade, Sara; Casazza, Peter G.; Nguyen, Hanh; Tremain, Janet C.

    2015-01-01

    In 2006, Balan/Casazza/Edidin \\cite{BCE} introduced the frame theoretic study of phaseless reconstruction. Since then, this has turned into a very active area of research. Over the years, many people have replaced the term {\\it phaseless reconstruction} with {\\it phase retrieval}. Casazza then asked: {\\it Are these really the same?} In this paper, we will show that phase retrieval is equivalent to phaseless reconstruction. We then show, more generally, that phase retrieval by projections is e...

  7. Reconstruction of symmetric Potts Models

    Sly, Allan

    2008-01-01

    The reconstruction problem on the tree has been studied in numerous contexts including statistical physics, information theory and computational biology. However, rigorous reconstruction thresholds have only been established in a small number of models. We prove the first exact reconstruction threshold in a non-binary model establishing the Kesten-Stigum bound for the 3-state Potts model on regular trees of large degree. We further establish that the Kesten-Stigum bound is not tight for the $...

  8. Index of Joint Condition for PVC push-fit joints

    Arsenio, A.M.; Vreeburg, J.H.G.; Rietveld, L.

    2014-01-01

    The Index of Joint Condition (IJC) for polyvinyl chloride (PVC) push-fit joints, discussed in this article, was derived from installation guidelines and from destructive laboratory tests. The IJC is presented in a graphical framework and is a powerful tool to employ in order to visualize and compare

  9. TEMPOROMANDIBULAR-JOINT OSTEOARTHROSIS AND GENERALIZED JOINT HYPERMOBILITY

    DIJKSTRA, PU; DEBONT, LGM; STEGENGA, B; BOERING, G

    1992-01-01

    Peripheral joint mobility of temporomandibular joint (TMJ) osteoarthrosis and internal derangement patients (n = 25) and of a control group (n = 29) was measured according to a rigidly standardized protocol, in order to study the relationships between TMJ osteoarthrosis and internal derangement and

  10. Anatomical basics, variations, and degenerative changes of the shoulder joint and shoulder girdle

    -lesions may occur and at the glenoid rim, where the labrum is often not fixed to the bony margin, avulsions of the labrum may occur. This well-established anatomical condition must not be mistaken for a manifest Bankart-lesion. The glenohumeral ligaments, which are located in the ventral articular capsule, have a stabilizing function for the ventral part of the glenoid labrum. The glenohumeral ligaments lift the articular lip where it crosses the glenoid notch. This 'labrum-lift effect' supports the stabilizing features of the articular lip and the glenohumeral ligaments. The rotator cuff is composed of the tendons of the teres minor, infraspinatus, supraspinatus, and subscapularis muscles. This cuff has a poorly vascularized area, due to mechanical conditions, about 1.5 cm from the major tubercle, which causes degenerative changes and eventually may lead to ruptures. Results of the impingement-syndrome and the osteoarthrotic changes of the shoulder and acromioclavicular joint are also presented and discussed. Finally, the coracoclavicular joint, which probably represents no congenital entity but appears due to a changed, lowered position of the shoulder girdle, is discussed. The paper also presents instructive figures of anatomical preparations that can be used to make more precise radiological and differential diagnoses. All preparations were done by the author and are part of a series of more than 300 preparations of the shoulder joint and girdle

  11. Temporomandibular joint arthrography

    The stress and occlusion disturbance are very important etiologic factors in the temporomandibular joint (TMJ) pain dysfunction syndromes. Authors performed TMJ arthrograms in the patients with TMJ problem such as pain, click sound, limited motion and locking, etc. The following results noted: 1. The arthrographic findings of 22 TMJ were analyzed. a) Normal: 6 cases b) Anterior disc displacement with rediction: 6 cases · Early reduction: 2 cases · Intermediate reduction: 3 cases · Late reduction: 1 case c) Anterior disc displacement without reduction: 6 cases · Two cases had adhesion between the posterior portion of disc and the posterior surfaces of the articular eminence. 2. Among 22 cases, the clinical findings of 16 cases (73%) were compatible with arthrographic findings. 6 cases showed disparity between them.

  12. Unfavourable results in thumb reconstruction

    Samir M Kumta

    2013-01-01

    Full Text Available The history of thumb reconstruction parallels the history of hand surgery. The attributes that make the thumb unique, and that the reconstructive surgeon must assess and try to restore when reconstructing a thumb, are: Position, stability, strength, length, motion, sensibility and appearance. Deficiency in any of these attributes can reduce the utility of the reconstructed thumb. A detailed assessment of the patient and his requirements needs to be performed before embarking on a thumb reconstruction. Most unsatisfactory results can be attributed to wrong choice of procedure. Component defects of the thumb are commonly treated by tissue from adjacent fingers, hand or forearm. With refinements in microsurgery, the foot has become a major source of tissue for component replacement in the thumb. Bone lengthening, osteoplastic reconstruction, pollicisation, and toe to hand transfers are the commonest methods of thumb reconstruction. Unfavourable results can be classified as functional and aesthetic. Some are common to all types of procedures. However each type of reconstruction has its own unique set of problems. Meticulous planning and execution is essential to give an aesthetic and functionally useful thumb. Secondary surgeries like tendon transfers, bone grafting, debulking, arthrodesis, may be required to correct deficiencies in the reconstruction. Attention needs to be paid to the donor site as well.

  13. Set Reconstruction on the Hypercube

    Pebody, Luke

    2016-01-01

    Given an action of a group $G$ on a set $S$, the $k$-deck of a subset $T$ of $S$ is the multiset of all subsets of $T$ of size $k$, each given up to translation by $G$. For a given subset $T$, the {\\em reconstruction number} of $T$ is the minimum $k$ such that the $k$-deck uniquely identifies $T$ up to translation by $G$, and the {\\em reconstruction number} of the action $G:S$ is the maximum reconstruction number of any subset of $S$. The concept of reconstruction number extends naturally to ...

  14. Virtual 3-D Facial Reconstruction

    Martin Paul Evison

    2000-06-01

    Full Text Available Facial reconstructions in archaeology allow empathy with people who lived in the past and enjoy considerable popularity with the public. It is a common misconception that facial reconstruction will produce an exact likeness; a resemblance is the best that can be hoped for. Research at Sheffield University is aimed at the development of a computer system for facial reconstruction that will be accurate, rapid, repeatable, accessible and flexible. This research is described and prototypical 3-D facial reconstructions are presented. Interpolation models simulating obesity, ageing and ethnic affiliation are also described. Some strengths and weaknesses in the models, and their potential for application in archaeology are discussed.

  15. Saving Joint with Aerosol physics

    Full text: Using electro spray method to analyze wear debris from artificial joints. Well known aerosol techniques have been applied to determine the size distribution and concentration of wear particles found in joint fluids. The organic fraction (cells and large molecules) are removed by digestion. Knowing these data the risk of clogging of blood vessels can be medicinally reduced. (author)

  16. Exercise and the Knee Joint.

    Clarke, H. Harrison, Ed.

    1976-01-01

    This report by the President's Council on Physical Fitness and Sports examines the effects of various forms of physical exercise on the knee joint which, because of its vulnerability, is especially subject to injury. Discussion centers around the physical characteristics of the joint, commonly used measurements for determining knee stability,…

  17. Joint mathematical weekend in Copenhagen

    Raussen, Martin

    2008-01-01

    Notes from the 2008 joint mathematical weekend (29.02-02.03.2008) organized by the Danish Mathematical Society......Notes from the 2008 joint mathematical weekend (29.02-02.03.2008) organized by the Danish Mathematical Society...

  18. Knee and Ankle Reconstruction With Reverse Anterolateral Thigh and Free Anterolateral Thigh Flap From One Donor Site.

    Choi, KyeongBeom; Cho, JaeHo; Park, MyongChul; Park, Dong Ha; Lee, Il Jae

    2016-09-01

    Traditionally, the anterolateral thigh (ALT) free flap is used in distal lower extremity reconstruction. Reverse ALT flap has become one of the most popular choices for knee joint soft tissue defects. A 53-year-old man sustained a degloving injury in the right lateral side of the lower extremity from the lateral malleolar area to the knee joint area. The contamination was severe, necessitating serial debridement and negative pressure wound therapy. After 4 weeks, no more soft tissue necrosis was evident. No more microorganism growth was confirmed by swab culture. ALT free flap using proximal perforator was planned for lateral malleolar area reconstruction and reverse ALT flap using distal perforator was planned to cover knee joint after confirming the pedicle length was sufficient for simultaneous knee and lateral malleolar area reconstruction. PMID:27317019

  19. MRI of the Temporomandibular Joint

    Hashem Sharifian

    2010-05-01

    Full Text Available Before recent advances in the last three decades, evaluation of the temporomandiular joint (TMJ was primarily done by plain radiography and arthrography."nCT scan adds more detail in the study of articular surfaces and anatomy of the joint. However, no direct vision upon delicate structures of the joint was available."nMRI has changed this point of view by high contrast resolution of soft tissues."nNevertheless, various pulse sequences and imaging techniques in this modality, cause some controversy and confusion about the best technique for detection of anatomy of the joint and its different pathologic conditions."nAfter a concise review of the anatomy and defining various techniques, our scope is to verify which of these pulse sequences can better delineate joint structures and disorders.

  20. Induction brazing of complex joints

    Henningsen, Poul; Zhang, Wenqi; Bay, Niels

    2003-01-01

    Induction brazing is a fast and appropriate method for industrial joining of complex geometries and metal combinations. In all types of brazing processes it is important to heat the joint interface of the two materials to the same, high temperature. If one of the specimens is warmer than the other......, or if the hottest area is located outside the joint interface, a number of defects may appear: the braze metal may flow away from the joint, the flux may burn off, poor binding of the braze metal may appear or the braze metal may be overheated. Joint geometry as well as electro-magnetic properties of...... the work piece materials has large influence on the heating time and temperature distribution in induction heating. In order to ensure high and uniform temperature distribution near the interface of a joint between dissimilar materials the precise coil geometry and position is of great importance. The...

  1. Space Station alpha joint bearing

    Everman, Michael R.; Jones, P. Alan; Spencer, Porter A.

    1987-01-01

    Perhaps the most critical structural system aboard the Space Station is the Solar Alpha Rotary Joint which helps align the power generation system with the sun. The joint must provide structural support and controlled rotation to the outboard transverse booms as well as power and data transfer across the joint. The Solar Alpha Rotary Joint is composed of two transition sections and an integral, large diameter bearing. Alpha joint bearing design presents a particularly interesting problem because of its large size and need for high reliability, stiffness, and on orbit maintability. The discrete roller bearing developed is a novel refinement to cam follower technology. It offers thermal compensation and ease of on-orbit maintenance that are not found in conventional rolling element bearings. How the bearing design evolved is summarized. Driving requirements are reviewed, alternative concepts assessed, and the selected design is described.

  2. Optimal reconstruction angles

    The question of optimal projection angles has recently become of interest in the field of reconstruction from projections. Here, studies are concentrated on the n x n pixel space, where literative algorithms such as ART and direct matrix techniques due to Katz are considered. The best angles are determined in a Gauss--Markov statistical sense as well as with respect to a function-theoretical error bound. The possibility of making photon intensity a function of angle is also examined. Finally, the best angles to use in an ART-like algorithm are studied. A certain set of unequally spaced angles was found to be preferred in several contexts. 15 figures, 6 tables

  3. Urogenital Reconstructive Surgery

    Jakobsen, Lotte Kaasgaard

    the lower urinary tract causes voiding disabilities, renal failure and chronic bladder changes. Children with such malformations often require extensive treatment, and will experience side effects and not always satisfactory results. Aim: To develop an animal model of congenital infravesical......Urogenital reconstructive surgery Lotte Kaasgaard Jakobsen1 Professor Henning Olsen1 Overlæge Gitte Hvistendahl1 Professor Karl-Erik Andersson2 1 – Dept. of Urology, Aarhus University Hospital 2 – Dept. of Gynecology and Obstetrics, Aarhus University hospital Background: Congenital obstruction of...... the fetal bladder to those of the bladder from young pigs used in the animal model. Results: By further characterising the effect of congenital obstruction, regarding urodynamic properties of the bladder and structural changes in the bladder tissue and comparing the results after relief of obstruction...

  4. Reconstructing the Alcatraz escape

    Baart, F.; Hoes, O.; Hut, R.; Donchyts, G.; van Leeuwen, E.

    2014-12-01

    In the night of June 12, 1962 three inmates used a raft made of raincoatsto escaped the ultimate maximum security prison island Alcatraz in SanFrancisco, United States. History is unclear about what happened tothe escapees. At what time did they step into the water, did theysurvive, if so, where did they reach land? The fate of the escapees has been the subject of much debate: did theymake landfall on Angel Island, or did the current sweep them out ofthe bay and into the cold pacific ocean? In this presentation, we try to shed light on this historic case using avisualization of a high-resolution hydrodynamic simulation of the San Francisco Bay, combined with historical tidal records. By reconstructing the hydrodynamic conditions and using a particle based simulation of the escapees we show possible scenarios. The interactive model is visualized using both a 3D photorealistic and web based visualization. The "Escape from Alcatraz" scenario demonstrates the capabilities of the 3Di platform. This platform is normally used for overland flooding (1D/2D). The model engine uses a quad tree structure, resulting in an order of magnitude speedup. The subgrid approach takes detailed bathymetry information into account. The inter-model variability is tested by comparing the results with the DFlow Flexible Mesh (DFlowFM) San Francisco Bay model. Interactivity is implemented by converting the models from static programs to interactive libraries, adhering to the Basic ModelInterface (BMI). Interactive models are more suitable for answeringexploratory research questions such as this reconstruction effort. Although these hydrodynamic simulations only provide circumstantialevidence for solving the mystery of what happened during the foggy darknight of June 12, 1962, it can be used as a guidance and provides aninteresting testcase to apply interactive modelling.

  5. Gender Mainstreaming and Sustainable Post Disaster Reconstruction,

    Yumarni, Tri; Amaratunga, Dilanthi; Haigh, Richard

    2013-01-01

    Gender inequalities are barriers to achieve sustainable post disaster reconstruction. Mainstreaming gender equality within post disaster reconstruction process can enhance sustainability of reconstruction. Based on a detailed literature review on post disaster reconstruction, this paper identifies pre-requisite conditions for mainstreaming gender within sustainable post disaster reconstruction as ; awareness of gender needs and concerns, a strong gender policy framework, women ...

  6. Vortical flow in human elbow joints: a three-dimensional computed tomography modeling study.

    Adikrishna, Arnold; Kekatpure, Aashay L; Tan, Jun; Lee, Hyun-Joo; Deslivia, Maria Florencia; Jeon, In-Ho

    2014-10-01

    The human elbow joint has been regarded as a loose hinge joint, with a unique helical motion of the axis during extension-flexion. This study was designed to identify the helical axis in the ulnohumeral joint during elbow extension-flexion by tracking the midpoint between the coronoid tip and the olecranon tip of the proximal ulna in a three-dimensional (3D) computed tomography (CT) image model. The elbows of four volunteers were CT-scanned at four flexion angles (0°, 45°, 90°, and 130°) at neutral rotation with a custom-made holding device to control any motion during scanning. Three-dimensional models of each elbow were reconstructed and a 3D ulnohumeral joint at 45°, 90°, and 130° was superimposed onto a fully extended joint (0°) by rotating and translating each 3D ulnohumeral joint along the axes. The midpoints of the olecranon and coronoid tips were interpolated using cubic spline technique and the dynamic elbow motion was plotted to determine the motion of the helical axis. The means and standard deviations were subsequently calculated. The average midpoint pattern of joint motion from extension to flexion was elliptical-orbit-like when projected onto a sagittal plane and continuously translated a mean 2.14 ± 0.34 mm (range, 1.83-2.52 mm) to the lateral side during elbow extension-flexion. In 3D space, the average midpoint pattern of the ulnohumeral joint resembles a vortical flow, spinning along an imaginary axis, with an inconsistent radius from 0° to 130° flexion. The ulnohumeral joint axis both rotates and translates during elbow extension-flexion, with a vortex-flow motion occurring during flexion in 3D model analysis. This motion should be considered when performing hinged external fixation, total elbow replacement and medial collateral ligament reconstruction surgery. PMID:25100632

  7. Breast reconstruction - methods and imaging

    Silicon implants are used for breast reconstruction or for cosmetic operations. The contribution outlines the role of mammography, sonography and MR for defect assessment, tumour detection and monitoring after prosthesis implantation. Instrument adjustment for mammographic screening of patients with implants is gone into. Autologic reconstruction techniques and protocols of secondary and tertiary early detection are presented. (orig.)

  8. Markov Random Field Surface Reconstruction

    Paulsen, Rasmus Reinhold; Bærentzen, Jakob Andreas; Larsen, Rasmus

    2010-01-01

    A method for implicit surface reconstruction is proposed. The novelty in this paper is the adaption of Markov Random Field regularization of a distance field. The Markov Random Field formulation allows us to integrate both knowledge about the type of surface we wish to reconstruct (the prior) and...

  9. Shoulder separation - aftercare

    Separated shoulder - aftercare; Acromioclavicular joint separation - aftercare; A/C separation - aftercare ... Shoulder separation is not an injury to the main shoulder joint itself. It is an injury to ...

  10. Imaging biopsy composition at ACL reconstruction

    Pedersen DR

    2013-04-01

    Full Text Available Douglas R Pedersen,1,2 James A Martin,1,2 Daniel R Thedens,3 Noelle F Klocke,1,2 Nathaniel H Roberts,1 Jessica E Goetz,1 Annunziato Amendola1 1Department of Orthopaedics and Rehabilitation, 2Department of Biomedical Engineering, 3Department of Radiology, University of Iowa, Iowa City, IA, USA Purpose: Early-stage osteoarthritis (OA includes glycosaminoglycan (GAG loss and collagen disruption that cannot be seen on morphological magnetic resonance imaging (MRI. T1ρ MRI is a measurement that probes the low-frequency rate of exchange between protons of free water and those from water associated with macromolecules in the cartilage's extracellular matrix. While it has been hypothesized that increased water mobility resulting from early osteoarthritic changes cause elevated T1ρ MRI values, there remain several unknown mechanisms influencing T1ρ measurements in cartilage. The purpose of this work was to relate histological and biochemical metrics directly measured from osteochondral biopsies and fluid specimens with quantitative MRI-detected changes of in vivo cartilage composition. Patients and methods: Six young patients were enrolled an average of 41 days after acute anterior cruciate ligament (ACL rupture. Femoral trochlear groove osteochondral biopsies, serum, and synovial fluid were harvested during ACL reconstruction to complement a presurgery quantitative MRI study (T1ρ, T2, delayed gadolinium-enhanced MRI of cartilage [dGEMRIC] relaxation times. A high-resolution MRI scan of the excised osteochondral biopsy was also collected. Analyses of in vivo T1ρ images were compared with ex vivo T1ρ imaging, GAG assays and histological GAG distribution in the osteochondral biopsies, and direct measures of bone and cartilage turnover markers and "OA marker" 3B3 in serum and synovial fluid samples. Conclusion: T1ρ relaxation times in patients with a torn ACL were elevated from normal, indicating changes consistent with general fluid effusion after

  11. In vitro study of knee stability after two-band two-tunnel posterior cruciate ligament reconstruction

    MAO Yuan-qing; CHEN Bai-cheng; ZHU Zhen-an

    2006-01-01

    Objective: To compare the ability of three different reconstruction procedures in restoring the posterior displacement of tibia and the posterior stability of the knee joint from 0° to 120° flexion.Methods: Three posterior cruciate ligaments (PCL)reconstruction procedures were performed, namely twoband two-tunnel reconstruction, one-band anterior tunnel reconstruction and one-band posterior tunnel reconstruction. The posterior displacement of the tibia in relation to the femur was measured when a 200N posterior force was applied.Results: Within the flexion range of 0° to 30°, the displacement in the one-band posterior tunnel reconstruction showed little difference from that of an intact knee (P>0.05). But when the flexion exceeded 30°,especially when it exceeded 60°, the displacement in oneband posterior tunnel reconstruction was much greater than that of an intact knee (P < 0.01 ). In two-band two-tunnel reconstruction and one-band anterior tunnel reconstruction,the displacement was approximately the same as that of an intact knee ranging from 0° to 120° (P > 0.05), while a slight over-restriction might be found at some angles.Conclusions: Two-band reconstruction could effectively restrict the posterior displacement of the tibia and restore anterior, posterior stability of the knee joint within its full range of flexion. One-band anterior tunnel reconstruction also could maintain the posterior stability of the knee, while the result of one-band posterior tunnel reconstruction is the most unsatisfactory.

  12. Accuracy assessment of 3D bone reconstructions using CT: an intro comparison.

    Lalone, Emily A; Willing, Ryan T; Shannon, Hannah L; King, Graham J W; Johnson, James A

    2015-08-01

    Computed tomography provides high contrast imaging of the joint anatomy and is used routinely to reconstruct 3D models of the osseous and cartilage geometry (CT arthrography) for use in the design of orthopedic implants, for computer assisted surgeries and computational dynamic and structural analysis. The objective of this study was to assess the accuracy of bone and cartilage surface model reconstructions by comparing reconstructed geometries with bone digitizations obtained using an optical tracking system. Bone surface digitizations obtained in this study determined the ground truth measure for the underlying geometry. We evaluated the use of a commercially available reconstruction technique using clinical CT scanning protocols using the elbow joint as an example of a surface with complex geometry. To assess the accuracies of the reconstructed models (8 fresh frozen cadaveric specimens) against the ground truth bony digitization-as defined by this study-proximity mapping was used to calculate residual error. The overall mean error was less than 0.4 mm in the cortical region and 0.3 mm in the subchondral region of the bone. Similarly creating 3D cartilage surface models from CT scans using air contrast had a mean error of less than 0.3 mm. Results from this study indicate that clinical CT scanning protocols and commonly used and commercially available reconstruction algorithms can create models which accurately represent the true geometry. PMID:26037323

  13. General joint hypermobility and temporomandibular joint derangement in adolescents.

    Westling, L; Mattiasson, A.

    1992-01-01

    Joint mobility was assessed in each member of an epidemiological sample of 96 girls and 97 boys, 17 years old, and graded by means of the hypermobility score of Beighton et al. Twenty two per cent of the girls and 3% of the boys could perform five or more of the nine manoeuvres. The prevalence of symptoms and signs of internal derangement in the temporomandibular joint was higher in adolescents with hypermobility of joints (score greater than or equal to 5/9). In subjects with a high mobility...

  14. Component approach to the temporomandibular joint and coronoid process.

    Pfaff, Miles J; Clune, James; Steinbacher, Derek

    2014-12-01

    Reconstruction of the temporomandibular joint (TMJ) region is challenging. The conventional direct preauricular incision permits only limited access to the TMJ and surrounding structures, therefore risking injury to the facial nerve during retraction. The ideal approach allows sufficient exposure, preservation of underlying neurovascular structures, and achieves an optimal aesthetic outcome. We describe a preauricular posttragal incision with a superficial musculoaponeurotic system flap to allow wide exposure of the zygomatic arch, TMJ, condyle, and coronoid process. We postulate that this approach improves access, lessens the amount of retraction required, and creates a more inconspicuous scar. PMID:25383157

  15. A FINE GRANULAR JOINT SOURCE CHANNEL CODING METHOD

    ZhuoLi; ShenLanusun

    2003-01-01

    An improved FGS (Fine Granular Scalability) coding method is proposed in this letter,which is based on human visual characteristics.This method adjusts FGS coding frame rate according to the evaluation of video sequences so as to improve the coding efficiency and subject perceived quality of reconstructed images.Finally,a fine granular joint source channel coding is proposed based on the source coding method,which not only utilizes the network resources efficiently,but guarantees the reliable transmission of video information.

  16. Blob-enhanced reconstruction technique

    Castrillo, Giusy; Cafiero, Gioacchino; Discetti, Stefano; Astarita, Tommaso

    2016-09-01

    A method to enhance the quality of the tomographic reconstruction and, consequently, the 3D velocity measurement accuracy, is presented. The technique is based on integrating information on the objects to be reconstructed within the algebraic reconstruction process. A first guess intensity distribution is produced with a standard algebraic method, then the distribution is rebuilt as a sum of Gaussian blobs, based on location, intensity and size of agglomerates of light intensity surrounding local maxima. The blobs substitution regularizes the particle shape allowing a reduction of the particles discretization errors and of their elongation in the depth direction. The performances of the blob-enhanced reconstruction technique (BERT) are assessed with a 3D synthetic experiment. The results have been compared with those obtained by applying the standard camera simultaneous multiplicative reconstruction technique (CSMART) to the same volume. Several blob-enhanced reconstruction processes, both substituting the blobs at the end of the CSMART algorithm and during the iterations (i.e. using the blob-enhanced reconstruction as predictor for the following iterations), have been tested. The results confirm the enhancement in the velocity measurements accuracy, demonstrating a reduction of the bias error due to the ghost particles. The improvement is more remarkable at the largest tested seeding densities. Additionally, using the blobs distributions as a predictor enables further improvement of the convergence of the reconstruction algorithm, with the improvement being more considerable when substituting the blobs more than once during the process. The BERT process is also applied to multi resolution (MR) CSMART reconstructions, permitting simultaneously to achieve remarkable improvements in the flow field measurements and to benefit from the reduction in computational time due to the MR approach. Finally, BERT is also tested on experimental data, obtaining an increase of the

  17. Reconstruction of large traumatic segmental defects of the femur using segmental allograft with vascularized fibula inlay.

    Ridha, Hyder; Bernard, Jason; Gateley, David; Vesely, Martin J

    2011-07-01

    Segmental defects of the distal femur following trauma pose a reconstructive challenge. A stable reconstruction capable of withstanding high forces while allowing early mobility is paramount. The Capanna technique of reconstruction combining allograft with vascularized bone graft provides such a construct and has been described for oncological resection. We describe a modified Capanna technique, the "inlay" construct. Three reconstructions were performed for distal femoral segmental loss following trauma. One patient had bilateral reconstructions. Bone defects measuring 11, 9, and 8 cm were reconstructed using a large segmental allograft and free fibular flap inlay assembly. Both patients made uneventful recoveries and achieved full weight-bearing without walking aids 6 months postreconstruction. Range of movement of each knee joint achieved at least 90 degrees of active flexion. We have shown that large segmental traumatic defects of the femur can be successfully reconstructed using segmental allograft with vascularized fibula inlay. This reconstruction provides early mechanical stability, protecting the fibula from fracturing and allowing axial loading of healing bone. The inlay assembly allows a large area of bony contact between allograft and vascularized bone, optimizing bony healing. It is a good alternative to other established techniques of managing significant segmental defects of the distal femur. PMID:21717390

  18. Long-Term Symptoms Onset and Heterotopic Bone Formation around a Total Temporomandibular Joint Prosthesis: a Case Report

    Luca Guarda-Nardini; Daniele Manfredini; Marco Olivo; Giuseppe Ferronato

    2014-01-01

    Background: The literature on total alloplastic temporomandibular joint (TMJ) reconstructions is encouraging, and studies on total alloplastic TMJ replacements outcomes showed acceptable improvements in terms of both pain levels and jaw function. Nevertheless, some adverse events, such as heterotopic bone formation around the implanted prosthesis, may occur. In consideration of that, the present manuscript describes a case of heterotopic bone formation around a total temporomandibular joint p...

  19. Joint seal in tank

    A seal for a joint or gap between edges of adjacent wall sections (e.g. of concrete) of a liquid-containing vessel, such as a nuclear reactor cooling pond, comprises a sheet metal strip having longitudinally-extending edge parts, secured to the respective vessel-section edges, and a central part which is longitudinally corrugated to provide sufficient flexibility to accommodate slight relative movements between the vessel-section edges (e.g. due to thermal expansions). The edges of the sheet metal of the strip are turned in so that the edge parts of the strip are formed as generally U-section channels. These accommodate longitudinally extending securing bars which are bolted to the vessel wall sections by bolts which pass through the bars, through the free-edged wall of the channel section and through a longitudinally extending resilient seal pad compressed between that wall of the channel section and the vessel wall section to which it is secured. The other wall of the channel section (integral with the corrugated central part of the strip) has access windows through which the bolts are inserted and tightened, the windows being then closed off in liquid-tight manner by welding closure caps over them. (author)

  20. Errors and Uncertainties in Dose Reconstruction for Radiation Effects Research

    Strom, Daniel J.

    2008-04-14

    Dose reconstruction for studies of the health effects of ionizing radiation have been carried out for many decades. Major studies have included Japanese bomb survivors, atomic veterans, downwinders of the Nevada Test Site and Hanford, underground uranium miners, and populations of nuclear workers. For such studies to be credible, significant effort must be put into applying the best science to reconstructing unbiased absorbed doses to tissues and organs as a function of time. In many cases, more and more sophisticated dose reconstruction methods have been developed as studies progressed. For the example of the Japanese bomb survivors, the dose surrogate “distance from the hypocenter” was replaced by slant range, and then by TD65 doses, DS86 doses, and more recently DS02 doses. Over the years, it has become increasingly clear that an equal level of effort must be expended on the quantitative assessment of uncertainty in such doses, and to reducing and managing uncertainty. In this context, this paper reviews difficulties in terminology, explores the nature of Berkson and classical uncertainties in dose reconstruction through examples, and proposes a path forward for Joint Coordinating Committee for Radiation Effects Research (JCCRER) Project 2.4 that requires a reasonably small level of effort for DOSES-2008.

  1. AORTOILIAC AND AORTOFEMORAL RECONSTRUCTION OF OBSTRUCTIVE DISEASE

    VANDENAKKER, PJ; VANSCHILFGAARDE, R; BRAND, R; VANBOCKEL, JH; TERPSTRA, JL

    1994-01-01

    This retrospective study evaluates our strategy to limit prosthetic reconstructions for aortoiliac obstructive disease to the diseased segments in 518 patients. There were 363 (70%) reconstructions without femoral anastomotic sites (FEM-0), 107 (21%) reconstructions with one femoral anastomotic site

  2. TEMPOROMANDIBULAR-JOINT OSTEOARTHROSIS AND TEMPOROMANDIBULAR-JOINT HYPERMOBILITY

    DIJKSTRA, PU; DEBONT, LGM; DELEEUW, R; STEGENGA, B; BOERING, G

    1993-01-01

    For studying the relationship between condylar hypermobility of the temporomandibular joint (TMJ) and osteoarthrosis (OA), 13 patients with bilateral condylar hypermobility were evaluated clinically and radiographically, 30 years after non-surgical treatment. The evaluation included range of motion,

  3. Correlation of Reconstructed Scaphoid Morphology with Clinical Outcomes

    Ahmadreza Afshar; Afshin Mohammadi; Kian Zohrabi; Nasrin Navaeifar; Sam Sami; Hassan Taleb

    2015-01-01

    Background: Scaphoid malunion alters the carpal kinematics and impairs clinical outcome because of pain, weakness, restricted range of motion and predisposing the wrist joint to early osteoarthritis. The aim of this study was to evaluate the influence of the scaphoid morphological angles on clinical outcomes in patients with reconstructed scaphoid by non-vascularized bone graft. Methods: Seventeen male patients with the mean age of 31.7±3.7 years and mean non-union time of 31.5±14.7 months we...

  4. Multiview specular stereo reconstruction of large mirror surfaces

    Balzer, Jonathan

    2011-06-01

    In deflectometry, the shape of mirror objects is recovered from distorted images of a calibrated scene. While remarkably high accuracies are achievable, state-of-the-art methods suffer from two distinct weaknesses: First, for mainly constructive reasons, these can only capture a few square centimeters of surface area at once. Second, reconstructions are ambiguous i.e. infinitely many surfaces lead to the same visual impression. We resolve both of these problems by introducing the first multiview specular stereo approach, which jointly evaluates a series of overlapping deflectometric images. Two publicly available benchmarks accompany this paper, enabling us to numerically demonstrate viability and practicability of our approach. © 2011 IEEE.

  5. Muscle strength after ACL reconstruction with bone tendon-bone patellar autograft tested by Cybex II dynamometer

    Gogus, Abdullah; Taser, Omer; Eralp, Levent

    2004-01-01

    The Cybex II dynamometer is a device which offers isokinetic testing of different body joints and muscle groups, allowing precise, reproducible control of joint range of motion in keeping with specific rehabilitation goals. This system collects torque, work and power data, thus it can be used to identify and quantify functional musculoskeletal deficits. 25 patients with chronic anterolateral knee instability have been treated with ACL reconstruction using bone-tendon-bone patellar autograft a...

  6. Osteoarthritis of the Wrist STT Joint and Radiocarpal Joint

    Ronit Wollstein; Julio Clavijo; Gilula, Louis A.

    2012-01-01

    Our understanding of wrist osteoarthritis (OA) lags behind that of other joints, possibly due to the complexity of wrist biomechanics and the importance of ligamentous forces in the function of the wrist. Scaphotrapeziotrapezoidal (STT) OA is common, but its role in wrist clinical pathology and biomechanics is unclear. We identified the prevalence of radiographic STT joint OA in our hand clinic population and defined the relationship between STT and radiocarpal OA in wrist radiographs. One hu...

  7. Vulvovaginal reconstruction for neoplastic disease.

    Höckel, Michael; Dornhöfer, Nadja

    2008-06-01

    Current treatment of neoplastic disease that involves the external female genitalia aims to achieve local disease control, but not to restore form and function of these organs. Despite a growing trend to reduce the extent of surgical resection, impaired quality of life after surgery due to severe sexual dysfunction and disturbed body image is common. We postulate that the integration of surgical techniques for vulvar and vaginal reconstruction into primary treatment would improve aesthetic and functional results and therefore quality of life. We systematically searched the literature for surgical procedures designed and validated for vulvovaginal reconstruction. Various skin flaps, both with random vascularisation and those based on vascular territories (ie, axial pattern, fasciocutaneous, musculocutaneous, and bowel flaps), can restore important parts of vulvovaginal form and function with acceptable morbidity at the donor and recipient sites. Appropriate vulvovaginal reconstruction cannot be achieved by doing a few standardised procedures; rather, it necessitates specialists who are familiar with general principles of reconstructive surgery to master many techniques to select the optimum procedure for the individual patient. Vulvovaginal reconstructive surgery has limitations, particularly achievement of functional restoration in irradiated tissue. Physicians who treat women with neoplastic disease of the external genitalia should be aware of the current state of vulvovaginal reconstructive surgery. Prospective controlled clinical trials are warranted to assess the effect of vulvovaginal reconstruction on morbidity and quality of life after treatment. PMID:18510987

  8. High resolution three-dimensional photoacoustic imaging of human finger joints in vivo

    Xi, Lei; Jiang, Huabei

    2015-08-01

    We present a method for noninvasively imaging the hand joints using a three-dimensional (3D) photoacoustic imaging (PAI) system. This 3D PAI system utilizes cylindrical scanning in data collection and virtual-detector concept in image reconstruction. The maximum lateral and axial resolutions of the PAI system are 70 μm and 240 μm. The cross-sectional photoacoustic images of a healthy joint clearly exhibited major internal structures including phalanx and tendons, which are not available from the current photoacoustic imaging methods. The in vivo PAI results obtained are comparable with the corresponding 3.0 T MRI images of the finger joint. This study suggests that the proposed method has the potential to be used in early detection of joint diseases such as osteoarthritis.

  9. Evidence-Based ACL Reconstruction

    E. Carlos RODRIGUEZ-MERCHAN

    2015-01-01

    Full Text Available There is controversy in the literature regarding a number of topics related to anterior cruciate ligament (ACLreconstruction. The purpose of this article is to answer the following questions: 1 Bone patellar tendon bone (BPTB reconstruction or hamstring reconstruction (HR; 2 Double bundle or single bundle; 3 Allograft or authograft; 4 Early or late reconstruction; 5 Rate of return to sports after ACL reconstruction; 6 Rate of osteoarthritis after ACL reconstruction. A Cochrane Library and PubMed (MEDLINE search of systematic reviews and meta-analysis related to ACL reconstruction was performed. The key words were: ACL reconstruction, systematic reviews and meta-analysis. The main criteria for selection were that the articles were systematic reviews and meta-analysesfocused on the aforementioned questions. Sixty-nine articles were found, but only 26 were selected and reviewed because they had a high grade (I-II of evidence. BPTB-R was associated with better postoperative knee stability but with a higher rate of morbidity. However, the results of both procedures in terms of functional outcome in the long-term were similar. The double-bundle ACL reconstruction technique showed better outcomes in rotational laxity, although functional recovery was similar between single-bundle and double-bundle. Autograft yielded better results than allograft. There was no difference between early and delayed reconstruction. 82% of patients were able to return to some kind of sport participation. 28% of patients presented radiological signs of osteoarthritis with a follow-up of minimum 10 years.

  10. Facial Reconstruction and Rehabilitation.

    Guntinas-Lichius, Orlando; Genther, Dane J; Byrne, Patrick J

    2016-01-01

    Extracranial infiltration of the facial nerve by salivary gland tumors is the most frequent cause of facial palsy secondary to malignancy. Nevertheless, facial palsy related to salivary gland cancer is uncommon. Therefore, reconstructive facial reanimation surgery is not a routine undertaking for most head and neck surgeons. The primary aims of facial reanimation are to restore tone, symmetry, and movement to the paralyzed face. Such restoration should improve the patient's objective motor function and subjective quality of life. The surgical procedures for facial reanimation rely heavily on long-established techniques, but many advances and improvements have been made in recent years. In the past, published experiences on strategies for optimizing functional outcomes in facial paralysis patients were primarily based on small case series and described a wide variety of surgical techniques. However, in the recent years, larger series have been published from high-volume centers with significant and specialized experience in surgical and nonsurgical reanimation of the paralyzed face that have informed modern treatment. This chapter reviews the most important diagnostic methods used for the evaluation of facial paralysis to optimize the planning of each individual's treatment and discusses surgical and nonsurgical techniques for facial rehabilitation based on the contemporary literature. PMID:27093062

  11. Reconstructing human evolution

    Cavalli-Sforza, M

    1999-01-01

    One can reconstruct human evolution using modern genetic data and models based on the mathematical theory of evolution and its four major factors : mutation, natural selection, statistical fluctuations in finite populations (random genetic drift), and migration. Archaeology gives some help on the major dates and events of the process. Chances of studying ancient DNA are very limited but there have been a few successful results. Studying DNA instead of proteins, as was done until a few years ago, and in particular the DNA of mitochondria and of the Y chromosome which are transmitted, respectively, by the maternal line and the paternal line, has greatly simplified the analysis. It is now possible to carry the analysis on individuals, while earlier studies were of necessity based on populations. Also the evolution of ÒcultureÓ (i.e. what we learn from others), in particular that of languages, gives some help and can be greatly enlightened by genetic studies. Even though it is largely based on mechanisms of mut...

  12. Orthotopic neobladder reconstruction

    Dwayne T. S. Chang

    2015-01-01

    Full Text Available Orthotopic neobladder reconstruction is becoming an increasingly common urinary diversion following cystectomy for bladder cancer. This is in recognition of the potential benefits of neobladder surgery over creation of an ileal conduit related to quality of life (QoL, such as avoiding the need to form a stoma with its cosmetic, psychological and other potential complications. The PubMed database was searched using relevant search terms for articles published electronically between January 1994 and April 2014. Full-text articles in English or with English translation were assessed for relevance to the topic before being included in the review. Patients with neobladders have comparable or better post-operative sexual function than those with ileal conduits. They also have comparable QoL to those with ileal conduits. Orthotopic neobladder is a good alternative to ileal conduit in suitable patients who do not want a stoma and are motivated to comply with neobladder training. However, the selection of a neobladder as the urinary diversion of choice requires that patients have good renal and liver functions and are likely to be compliant with neobladder training. With benefits also come potential risks of neobladder formation. These include electrolyte abnormalities and nocturnal incontinence. This short review highlights current aspects of neobladder formation and its potential advantages.

  13. Reconstruction tomography from incomplete projections

    In some instances, reconstruction radionuclide tomography must be carried out from projections that do not include projection values for all portions of the object to be reconstructed. This may occur, for example, when the field of view of the detector is limited, or when an opaque foreign body is present within the object. The effects of such incomplete projections upon reconstructions of computer-simulated phantoms were studied, using iterative and convolution methods. Several methods for reducing the resulting artifacts and inaccuracies are discussed

  14. 膝关节周围皮肤软组织缺损的修复%Repair of skin and soft tissue defects around the knee joints

    谭谦; 许澎

    2015-01-01

    Skin and soft tissue defects around the knee joints are often accompanied by popliteal artery injury, patellar ligament injury, patellar fracture, and other deep tissue damage or exposure, making them challenging to repair.The principle is to repair the wound, reconstruct anatomical structure of the knee joint, and recover the knee joint function.At present the reconstruction with skin flap or myocutaneous flap is our priority.Local flap or myocutaneous flap can be used for repairing minor defects around the knee joints.Repairing with perforator flap, fascia flap, and free flap are main alternatives for covering larger and complex defects around the knee joints.During the treatment, a joint effort is mandatory, not only to repair the wound, but also to reconstruct vasculature, fix fracture, repair ligament, and finally recover the knee joint function.Therefore, the importance of multidisciplinary cooperation must be emphasized.Moreover, along with the development of new technologies, new methods, and new materials, perforator flap plays an important role in repairing skin and soft tissue defects around the knee joints.

  15. A constrained variable projection reconstruction method for photoacoustic computed tomography without accurate knowledge of transducer responses

    Sheng, Qiwei; Matthews, Thomas P; Xia, Jun; Zhu, Liren; Wang, Lihong V; Anastasio, Mark A

    2015-01-01

    Photoacoustic computed tomography (PACT) is an emerging computed imaging modality that exploits optical contrast and ultrasonic detection principles to form images of the absorbed optical energy density within tissue. When the imaging system employs conventional piezoelectric ultrasonic transducers, the ideal photoacoustic (PA) signals are degraded by the transducers' acousto-electric impulse responses (EIRs) during the measurement process. If unaccounted for, this can degrade the accuracy of the reconstructed image. In principle, the effect of the EIRs on the measured PA signals can be ameliorated via deconvolution; images can be reconstructed subsequently by application of a reconstruction method that assumes an idealized EIR. Alternatively, the effect of the EIR can be incorporated into an imaging model and implicitly compensated for during reconstruction. In either case, the efficacy of the correction can be limited by errors in the assumed EIRs. In this work, a joint optimization approach to PACT image r...

  16. Reconstructing the projected gravitational potential of Abell 1689 from X-ray measurements

    Tchernin, Celine; Meyer, Sven; Sarli, Eleonora; Eckert, Dominique; Bartelmann, Matthias

    2015-01-01

    Context. Galaxy clusters can be used as cosmological probes, but to this end, they need to be thoroughly understood. Combining all cluster observables in a consistent way will help us to understand their global properties and their internal structure. Aims. We provide proof of the concept that the projected gravitational potential of galaxy clusters can directly be reconstructed from X-ray observations. We also show that this joint analysis can be used to locally test the validity of the equilibrium assumptions in galaxy clusters. Methods. We used a newly developed reconstruction method, based on Richardson-Lucy deprojection, that allows reconstructing projected gravitational potentials of galaxy clusters directly from X-ray observations. We applied this algorithm to the well-studied cluster Abell 1689 and compared the gravitational potential reconstructed from X-ray observables to the potential obtained from gravitational lensing measurements. [...] Results. Assuming spherical symmetry and hydrostatic equili...

  17. Finishing touch to joint venture

    2003-01-01

    "A new process for polishing titanium and its alloys has been announced following an agreement between Bripol (an Anopol/Delmet joint venture) of Birmingham and the European Organisation for Nuclear Reseach (CERN) in Geneva" (1 paragraph).

  18. Practical aspects of joint implementation

    Article 4, 2a of the UN Framework Convention on Climate Change states the possibility of joint policies of different countries to achieve national greenhouse gas reduction commitments (Joint Implementation). The cost of reducing greenhouse gas emissions can be reduced drastically if industrialized countries shift abatement activities to developing countries as marginal cost of reduction is much higher in the former countries. In this way economic efficiency of abatement measures can be raised to the point where marginal cost is equal all over the world. At the Conference of the Parties in Berlin in March 1995, criteria for Joint Implementation are to be established. The paper discusses possible forms of Joint Implementation and develops criteria

  19. MRI of the hip joint

    Magnetic resonance imaging (MRI) is performed to diagnose many pathologic conditions affecting the hip joint. Either conventional MRI (without contrast enhancement of the joint cavity) or MR arthrography is used to detect and most accurately differentiate hip joint pathologies. Conventional MRI is performed in cases of bone marrow edema, necrosis, arthrosis and especially the so-called ''activated arthrosis'', as well as in inflammatory and tumorous entities. MR arthography, which has only recently become available for use, is excellently suited for diagnosing lesions of the acetabular labrum, cartilage lesions, and free articular bodies. This article provides an overview about MRI characteristics and their accuracy of hip joint diseases and the impact on the therapeutic procedure. (orig.)

  20. US Joint Ventures 2014 revision

    US Fish and Wildlife Service, Department of the Interior — A joint venture is a self-directed partnership of agencies, organizations, corporations, tribes, or individuals that has formally accepted the responsibility of...

  1. Joint Performance and Planning System

    US Agency for International Development — A joint State/USAID system hosted by State that integrates resource and performance information at the program level and enables more flexible and frequent entry of...

  2. Update on rehabilitation following ACL reconstruction

    John Nyland

    2010-09-01

    Full Text Available John Nyland, Emily Brand, Brent FisherDepartment of Orthopaedic Surgery, Division of Sports Medicine, University of Louisville, Louisville, KY, USAAbstract: As anterior cruciate ligament (ACL reconstruction has evolved to less invasive, more anatomical approaches, rehabilitation of the injured athlete has likewise become more progressive and innovative, with a sound understanding of graft and fixation strength and biologic healing-remodeling constraints. This review discusses these innovations including specific considerations before surgery, when planning rehabilitation timetables, and the importance of reestablishing nonimpaired active and passive knee range of motion and biarticular musculotendinous extensibility in positions of function. Concepts of self-efficacy or confidence and reestablishing the “athlete role” are also addressed. Since ACL injury and reinjury are largely related to the influence of structure-form-function on dynamic knee joint stability, the interrelationships between sensorimotor, neuromuscular, and conventional resistance training are also discussed. Although pivot shift “giving way” relates to function loss following ACL injury, anterior translational laxity often does not. Although there is growing evidence that progressive eccentric training may benefit the patient following ACL reconstruction, there is less evidence supporting the use of functional ACL knee braces. Of considerable importance is selecting and achieving a criteria-based progression to sports-specific training, reestablishing osseous homeostasis and improved bone density, blending open and closed kinetic chain exercises at the appropriate time period, and appreciating the influence of the trunk, upper extremities, and sports equipment use on knee loads. We believe that knee dysfunction and functional recovery should be considered from a local, regional, and global perspective. These concepts are consolidated into our approach to prepare

  3. Irradiation stability of welded joints

    Results are presented of investigations into the neutron irradiation stability of welded joints in two types of steel used for reactor pressure vessels. Details are given of the materials used, method of welding and tests applied. The effect of irradiation on the notch toughness transition curve is shown. The results of the studies into irradiation embrittlement of all the welded joints and parent materials of the steels for the pressure vessels are summarized. (U.K.)

  4. Shell Joint Venture IT Framework

    Evert Ruijs

    2013-01-01

    Dit artikel is alleen beschikbaar in het Nederlands. Shell's wereldwijde productie van olie en gas gaat voor een groot deel via Joint Ventures. Deze Joint Ventures werken in meer of mindere mate onder het management van Shell, vaak optioneel gebruik makend van Shell's processen, standaarden, gemeenschappelijke portfolio van applicaties en technologie. Om de vele soorten van applicaties en versies van implementaties beheersbaar te houden in de 'extended enterprise' is een goed raamwerk nodig. ...

  5. Joint between metals and PTFE

    Requirements to join dissimilar materials are more frequent in new technologies. The paper deals with a study of a joint between aluminium pieces and PTFE (teflon) pieces. The way of their joining is described. The joint was performed by soldering with adhesive 'x60', that covered the joining surfaces of the pieces, processed at a certain roughness, in a well established thickness layer. Initially, the surface of PTFE pieces were covered with a thin and uniform sodium metal sheet. The joint was realized by a particular procedure of soldering, simultaneously with plastic deformation of the metal. Various tests of the joint were carried out under conditions simulating service conditions. A piece joint was tested for its strength, thermal resistance and tightness. The tests showed a very good tightness of the joint at high vacuum (10-9 torr), in conditions of repeated thermic shocks, for temperature range within 73 K and 543 K. It was also study the interfaces between metal and PTFE. The study took into account the requirements of particular tests and relevant foreign standards, including ASTM and DIN. (authors)

  6. Reconstruction techniques for optoacoustic imaging

    Frenz, Martin; Koestli, Kornel P.; Paltauf, Guenther; Schmidt-Kloiber, Heinz; Weber, Heinz P.

    2001-06-01

    Optoacoustics is a method to gain information from inside a tissue. This is done by irradiating a tissue with a short light pulse, which generates a pressure distribution inside the tissue that mirrors the absorber distribution. The pressure distribution measured on the tissue-surface allows, by applying a back-projection method, to calculate a tomography image of the absorber distribution. This study presents a novel computational algorithm based on Fourier transform, which, at least in principle, yields an exact 3D reconstruction of the distribution of absorbed energy density inside turbid media. The reconstruction is based on 2D pressure distributions captured outside at different times. The FFT reconstruction algorithm is first tested in the back projection of simulated pressure transients of small model absorbers, and finally applied to reconstruct the distribution of artificial blood vessels in three dimensions.

  7. Breast Reconstruction with Tissue Expansion

    Full Text Available ... to go with Tamoxifen. At that point in time she did not want to get a reconstruction, ... her work and she's more comfortable with her time, she said she wanted to pursue the breast ...

  8. Breast Reconstruction with Tissue Expansion

    Full Text Available ... come to my practice a few months ago seeking a left breast reconstruction after mastectomy. She had ... Veritas Collagen Matrix sling in order to help support the expansion because there is possible radiation damage ...

  9. Submicron STIM tomography reconstruction techniques

    One-dimensional projections of ion energy loss have been converted to areal density using tabulated stopping powers in a scanning transmission ion microscopy (STIM) reconstruction of a test object, displaying a spatial resolution of 0.37 μm. Location and registration of the centre of areal mass density in each projection provides a means of overcoming (a) the misalignment of the specimen rotation axis with the centre of the scan path and (b) deviations of the specimen from its precession around the axis of rotation. Multiplicative algebraic reconstruction technique (ART), filtered backprojection and maximum-entropy algorithms for the reconstruction of the object are considered. Maximum entropy is shown to produce an image with the least number of artifacts. However, when time considerations are taken into account, it is found that filtered backprojection is the preferred algorithm for a tomographic reconstruction. (orig.)

  10. Reconstruction within the Zeldovich approximation

    White, Martin

    2015-01-01

    The Zeldovich approximation, 1st order Lagrangian perturbation theory, provides a good description of the clustering of matter and galaxies on large scales. The acoustic feature in the large-scale correlation function of galaxies imprinted by sound waves in the early Universe has been successfully used as a `standard ruler' to constrain the expansion history of the Universe. The standard ruler can be improved if a process known as density field reconstruction is employed. In this paper we develop the Zeldovich formalism to compute the correlation function of biased tracers in both real- and redshift-space using the simplest reconstruction algorithm with a Gaussian kernel and compare to N-body simulations. The model qualitatively describes the effects of reconstruction on the simulations, though its quantitative success depends upon how redshift-space distortions are handled in the reconstruction algorithm.

  11. Vermilion Reconstruction with Genital Mucosa.

    Müller-Richter, Urs D A; Weyandt, Gerhard H; Woeckel, Achim; Kübler, Alexander C

    2016-05-01

    Functional and aesthetical reconstruction, especially of the upper lip after ablative tumor surgery, can be very challenging. The skin of the lip might be sufficiently reconstructed by transpositional flaps from the nasolabial or facial area. Large defects of the lip mucosa, including the vestibule, are even more challenging due to the fact that flaps from the inner lining of the oral cavity often lead to functional impairments. We present a case of multiple vermilion and skin resections of the upper lip. At the last step, we had to resect even the whole vermilion mucosa, including parts of the oral mucosa of the vestibule, leaving a bare orbicularis oris muscle. To reconstruct the mucosal layer, we used a mucosal graft from the labia minora and placed it on the compromised lip and the former transpositional flaps for the reconstructed skin of the upper lip with very good functional and aesthetic results. PMID:27579226

  12. Provincial reconstruction teams improving effectiveness

    Sellers, Cameron S.

    2007-01-01

    Provincial Reconstruction Teams (PRTs) are currently prominent constructs for stabilization and reconstruction in Afghanistan and Iraq. PRTs are composed of civil-military teams, including elements from coalition partners and the host-nation, and involve multiple military services and civilian agencies. Their missions are to extend the legitimacy of the central government throughout the country and to use Civil Military Operations (CMO) to counter anti-government forces. PRTs are prominent,...

  13. Current Concepts in ACL Reconstruction

    Fu, Freddie H; Cohen, Steven B.

    2008-01-01

    Current Concepts in ACL Reconstruction is a complete reference text composed of the most thorough collection of topics on the ACL and its surgical reconstruction compiled, with contributions from some of the world's experts and most experienced ACL surgeons. Various procedures mentioned throughout the text are also demonstrated in an accompanying video CD-ROM. PURPOSE Composing a single, comprehensive and complete information source on ACL including basic sciences, clinical issues, latest con...

  14. Equilibrium Reconstruction in EAST Tokamak

    QIAN Jinping; WAN Baonian; L. L. LAO; SHEN Biao; S. A. SABBAGH; SUN Youwen; LIU Dongmei; XIAO Singjia; REN Qilong; GONG Xianzu; LI Jiangang

    2009-01-01

    Reconstruction of experimental axisymmetric equilibria is an important part of toka-mak data analysis. Fourier expansion is applied to reconstruct the vessel current distribution in EFIT code. Benchmarking and testing calculations are performed to evaluate and validate this algorithm. Two cases for circular and non-circular plasma discharges are presented. Fourier ex-pansion used to fit the eddy current is a robust method and the real time EFIT can be introduced to the plasma control system in the coming campaign.

  15. Reconstructing pedigrees: a stochastic perspective

    Thatte, Bhalchandra D.; Steel, Mike

    2007-01-01

    A pedigree is a directed graph that describes how individuals are related through ancestry in a sexually-reproducing population. In this paper we explore the question of whether one can reconstruct a pedigree by just observing sequence data for present day individuals. This is motivated by the increasing availability of genomic sequences, but in this paper we take a more theoretical approach and consider what models of sequence evolution might allow pedigree reconstruction (given sufficiently...

  16. Technical basis for dose reconstruction

    The purpose of this paper is to consider two general topics: technical considerations of why dose-reconstruction studies should or should not be performed and methods of dose reconstruction. The first topic is of general and growing interest as the number of dose-reconstruction studies increases, and one asks the question whether it is necessary to perform a dose reconstruction for virtually every site at which, for example, the Department of Energy (DOE) has operated a nuclear-related facility. And there is the broader question of how one might logically draw the line at performing or not performing dose-reconstruction (radiological and chemical) studies for virtually every industrial complex in the entire country. The second question is also of general interest. There is no single correct way to perform a dose-reconstruction study, and it is important not to follow blindly a single method to the point that cheaper, faster, more accurate, and more transparent methods might not be developed and applied

  17. Lip Reconstruction after Tumor Ablation

    Ebrahimi, Ali; Kalantar Motamedi, Mohammad Hossein; Ebrahimi, Azin; Kazemi, Mohammad; Shams, Amin; Hashemzadeh, Haleh

    2016-01-01

    Approximately 25% of all oral cavity carcinomas involve the lips, and the primary management of these lesions is complete surgical resection. Loss of tissue in the lips after resection is treated with a variety of techniques, depending on the extension and location of the defect. Here we review highly accepted techniques of lip reconstruction and some of new trials with significant clinical results. Reconstruction choice is primarily depend to size of the defect, localization of defect, elasticity of tissues. But patient’s age, comorbidities, and motivation are also important. According to the defect location and size, different reconstruction methods can be used. For defects involved less than 30% of lips, primary closures are sufficient. In defects with 35–70% lip involvement, the Karapandzic, Abbe, Estlander, McGregor or Gillies’ fan flaps or their modifications can be used. When lip remaining tissues are insufficient, cheek tissue can be used in Webster and Bernard advancement flaps and their various modifications. Deltopectoral or radial forearm free flaps can be options for large defects of the lip extending to the Jaws. To achieve best functional and esthetic results, surgeons should be able to choose most appropriate reconstruction method. Considering defects’ size and location, patients’ expects and surgeon’s ability and knowledge, a variety of flaps are presented in order to reconstruct defects resulted from tumor ablation. It’s necessary for surgeons to trace the recent innovations in lip reconstruction to offer best choices to patients. PMID:27308236

  18. 12 CFR 347.107 - Joint ventures.

    2010-01-01

    ... or holds an equity interest in a foreign organization that is a joint venture, and the bank or its... under § 347.105(b). (b) Joint venture defined. For purposes of this section, the term “joint venture... 12 Banks and Banking 4 2010-01-01 2010-01-01 false Joint ventures. 347.107 Section 347.107...

  19. MR-guided dynamic PET reconstruction with the kernel method and spectral temporal basis functions.

    Novosad, Philip; Reader, Andrew J

    2016-06-21

    Recent advances in dynamic positron emission tomography (PET) reconstruction have demonstrated that it is possible to achieve markedly improved end-point kinetic parameter maps by incorporating a temporal model of the radiotracer directly into the reconstruction algorithm. In this work we have developed a highly constrained, fully dynamic PET reconstruction algorithm incorporating both spectral analysis temporal basis functions and spatial basis functions derived from the kernel method applied to a co-registered T1-weighted magnetic resonance (MR) image. The dynamic PET image is modelled as a linear combination of spatial and temporal basis functions, and a maximum likelihood estimate for the coefficients can be found using the expectation-maximization (EM) algorithm. Following reconstruction, kinetic fitting using any temporal model of interest can be applied. Based on a BrainWeb T1-weighted MR phantom, we performed a realistic dynamic [(18)F]FDG simulation study with two noise levels, and investigated the quantitative performance of the proposed reconstruction algorithm, comparing it with reconstructions incorporating either spectral analysis temporal basis functions alone or kernel spatial basis functions alone, as well as with conventional frame-independent reconstruction. Compared to the other reconstruction algorithms, the proposed algorithm achieved superior performance, offering a decrease in spatially averaged pixel-level root-mean-square-error on post-reconstruction kinetic parametric maps in the grey/white matter, as well as in the tumours when they were present on the co-registered MR image. When the tumours were not visible in the MR image, reconstruction with the proposed algorithm performed similarly to reconstruction with spectral temporal basis functions and was superior to both conventional frame-independent reconstruction and frame-independent reconstruction with kernel spatial basis functions. Furthermore, we demonstrate that a joint spectral

  20. Evaluation of reconstruction errors and identification of artefacts for JET gamma and neutron tomography

    Craciunescu, Teddy, E-mail: teddy.craciunescu@jet.uk; Tiseanu, Ion; Zoita, Vasile [National Institute for Laser, Plasma and Radiation Physics, Magurele-Bucharest (Romania); Murari, Andrea [Consorzio RFX, Padova (Italy); Kiptily, Vasily; Sharapov, Sergei [CCFE Culham Science Centre, Abingdon, Oxon OX14 3DB (United Kingdom); Lupelli, Ivan [CCFE Culham Science Centre, Abingdon, Oxon OX14 3DB (United Kingdom); University of Rome “Tor Vergata,” Roma (Italy); Fernandes, Ana [Instituto de Plasmas e Fusão Nuclear, Instituto Superior Técnico, Universidade de Lisboa, Lisboa (Portugal); Collaboration: EUROfusion Consortium, JET, Culham Science Centre, Abingdon OX14 3DB (United Kingdom)

    2016-01-15

    The Joint European Torus (JET) neutron profile monitor ensures 2D coverage of the gamma and neutron emissive region that enables tomographic reconstruction. Due to the availability of only two projection angles and to the coarse sampling, tomographic inversion is a limited data set problem. Several techniques have been developed for tomographic reconstruction of the 2-D gamma and neutron emissivity on JET, but the problem of evaluating the errors associated with the reconstructed emissivity profile is still open. The reconstruction technique based on the maximum likelihood principle, that proved already to be a powerful tool for JET tomography, has been used to develop a method for the numerical evaluation of the statistical properties of the uncertainties in gamma and neutron emissivity reconstructions. The image covariance calculation takes into account the additional techniques introduced in the reconstruction process for tackling with the limited data set (projection resampling, smoothness regularization depending on magnetic field). The method has been validated by numerically simulations and applied to JET data. Different sources of artefacts that may significantly influence the quality of reconstructions and the accuracy of variance calculation have been identified.

  1. Evaluation of reconstruction errors and identification of artefacts for JET gamma and neutron tomography

    The Joint European Torus (JET) neutron profile monitor ensures 2D coverage of the gamma and neutron emissive region that enables tomographic reconstruction. Due to the availability of only two projection angles and to the coarse sampling, tomographic inversion is a limited data set problem. Several techniques have been developed for tomographic reconstruction of the 2-D gamma and neutron emissivity on JET, but the problem of evaluating the errors associated with the reconstructed emissivity profile is still open. The reconstruction technique based on the maximum likelihood principle, that proved already to be a powerful tool for JET tomography, has been used to develop a method for the numerical evaluation of the statistical properties of the uncertainties in gamma and neutron emissivity reconstructions. The image covariance calculation takes into account the additional techniques introduced in the reconstruction process for tackling with the limited data set (projection resampling, smoothness regularization depending on magnetic field). The method has been validated by numerically simulations and applied to JET data. Different sources of artefacts that may significantly influence the quality of reconstructions and the accuracy of variance calculation have been identified

  2. Migrating bone shards in dissecting Charcot joints.

    Forrester, D M; Magre, G

    1978-06-01

    Extensive periarticular calcification is characteristic of Charcot joints. Fragmentation of the articular margins of bone contributes to the bony detritus, but the majority forms de novo in the joint capsule. Occasionally the calcific debris is seen far removed from the joint. Dissection of a chronically distended joint along muscle planes is most commonly associated with the inflammatory joint disease of rheumatoid arthritis. Its occurrence in Charcot joints is documented by arthrography, which demonstrates continuity of the joint space and the distant calcifications. PMID:418652

  3. Reconstruction of the thumb with osteofasciocutaneous reverse flap

    Jevtović Dobrica

    2002-01-01

    Full Text Available This paper presents the experiences of the thumb reconstruction with osteofasciocutaneous reverse flap (OFCR flap. In the period between 1987 and 2000 the OFCR flap was used in 15 patients. The youngest of them was 18 and the oldest was 38 years of age. The average age was 25.4. All the patients had post-traumatic amputations. Defects on proximal phalangae and a part of metacarpal bone occurred in two cases. In one case there was an amputation on the base level of proximal phalanx and the metacarpophalangeal (MPH joint was preserved. In all cases of reconstruction the OFCR flap was used, which included antebrachial skin nerves that were anastomosed with digital nerve. The flap nutrition was carried out through the reverse circulation of a. radialis, and the venous drainage through the comitant vein of a. radialis. Superficial veins were not anastomosed. Secondary defects were covered with a free skin graft. All the flaps survived. The bone graft was healed in the period of eight weeks. The sensibility of this flap was regained in the period of three to six months after the surgery. The distance of two-point discrimination (TPD was increased for 30% compared to the same region on the other hand after six months. The opposition of the reconstructed thumb to the other fingers was possible, as well as abduction, adduction and normal grasp. The method of reconstruction of the amputated thumb with the OFCR flap was better than other classical methods because it allowed the reconstruction of all the structures in one surgical operation. The sensibility that was regained represented good protection from injuries. There were no functional damages on the secondary defect. The esthetic result was not good due to the lack of a fingernail.

  4. [Reconstruction of the thumb using a forearm osseofasciocutaneous reverse flap].

    Jevtović, Dobrica; Dordević, Boban; Gacević, Milomir; Sijan, Goran

    2002-01-01

    This paper presents the experiences of the thumb reconstruction with osteofasciocutaneous reverse flap (OFCR flap). In the period between 1987 and 2000 the OFCR flap was used in 15 patients. The youngest of them was 18 and the oldest was 38 years of age. The average age was 25.4. All the patients had posttraumatic amputations. Defects on proximal phalangae and a part of metacarpal bone occurred in two cases. In one case there was an amputation on the base level of proximal phalanx and the metacarpophalangeal (MPH) joint was preserved. In all cases of reconstruction the OFCR flap was used, which included antebrachial skin nervs that were anastomosed with digital nerv. The flap nutrition was carried out through the reverse circulation of a. radialis, and the venous drainage through the comitant vein of a. radialis. Superficial veins were not anastomosed. Secondary defects were covered with a free skin graft. All the flaps survived. The bone graft was healed in the period of eight weeks. The sensibility of this flap was regained in the period of three to six months after the surgery. The distance of two-point discrimination (TPD) was increased for 30% compared to the same region on the other hand after six months. The opposition of the reconstructed thumb to the other fingers was possible, as well as abduction, adduction and normal grasp. The method of reconstruction of the amputated thumb with the OFCR flap was better than other classical methods because it allowed the reconstruction of all the structures in one surgical operation. The sensibility that was regained represented good protection from injuries. There were no functional damages on the secondary defect. The esthetic result was not good due to the lack of a fingernail. PMID:12557617

  5. On $\\mathfrak{I}$-reconstruction Property

    Vashisht, L. K.; Khattar, Geetika

    2013-01-01

    Reconstruction property in Banach spaces introduced and studied by Casazza and Christensen in [1]. In this paper we introduce reconstruction property in Banach spaces which satisfy $\\mathfrak{I}$-property. A characterization of reconstruction property in Banach spaces which satisfy $\\mathfrak{I}$-property in terms of frames in Banach spaces is obtained. Banach frames associated with reconstruction property are discussed.

  6. Ulnar Collateral Ligament Reconstruction

    Erickson, Brandon J.; Bach, Bernard R.; Cohen, Mark S.; Bush-Joseph, Charles A.; Cole, Brian J.; Verma, Nikhil N.; Nicholson, Gregory P.; Romeo, Anthony A.

    2016-01-01

    Background: Ulnar collateral ligament reconstruction (UCLR) is a common surgery performed in professional, collegiate, and high school athletes. Purpose: To report patient demographics, surgical techniques, and outcomes of all UCLRs performed at a single institution from 2004 to 2014. Study Design: Case series; Level of evidence, 4. Methods: All patients who underwent UCLR from January 1, 2004, through December 31, 2014, at a single institution were identified. Charts were reviewed to determine patient age, sex, date of surgery, sport played, athletic level, surgical technique, graft type, and complications. Data were collected prospectively, and patients were contacted via phone calls to obtain the return-to-sport rate, Conway-Jobe score, Andrews-Timmerman score, and Kerlan-Jobe Orthopaedic Clinic (KJOC) Shoulder and Elbow score. Continuous variable data were reported as weighted means, and categorical variable data were reported as frequencies with percentages. Results: A total of 187 patients (188 elbows) underwent UCLR during the study period (92% male; mean age, 19.6 ± 4.7 years; 78.2% right elbows). There were 165 baseball players (87.8% of all patients), 155 of whom were pitchers (82.5% of all patients). Ninety-seven (51.6%) were college athletes, 68 (36.2%) high school athletes, and 7 (3.7%) professional athletes at the time of surgery. The docking technique was used in 110 (58.5%) patients while the double-docking technique was used in 78 (41.5%). An ipsilateral palmaris longus graft was used in 110 (58.5%) patients while a hamstring autograft was used in 48 (25.5%) patients. The ulnar nerve was subcutaneously transposed in 79 (42%) patients. Clinical follow-up data were available on 85 patients. Mean follow-up was 60 ± 30.8 months. Overall, 94.1% of patients were able to return to sport and had a Conway-Jobe score of good/excellent while 4.3% had a score of fair. The mean KJOC score was 90.4 ± 6.7 and mean Andrews-Timmerman score was 92.5 ± 7

  7. Reconstruction of sequential data with density models

    Carreira-Perpiñán, Miguel Á

    2011-01-01

    We introduce the problem of reconstructing a sequence of multidimensional real vectors where some of the data are missing. This problem contains regression and mapping inversion as particular cases where the pattern of missing data is independent of the sequence index. The problem is hard because it involves possibly multivalued mappings at each vector in the sequence, where the missing variables can take more than one value given the present variables; and the set of missing variables can vary from one vector to the next. To solve this problem, we propose an algorithm based on two redundancy assumptions: vector redundancy (the data live in a low-dimensional manifold), so that the present variables constrain the missing ones; and sequence redundancy (e.g. continuity), so that consecutive vectors constrain each other. We capture the low-dimensional nature of the data in a probabilistic way with a joint density model, here the generative topographic mapping, which results in a Gaussian mixture. Candidate recons...

  8. Leaving a joint audit system

    Holm, Claus; Thinggaard, Frank

    2014-01-01

    Purpose: The authors aim to exploit a natural experment in which voluntary replace mandatory joint audits for Danish listed companies and analyse audit fee implications of using one or two audit firms. Design/methodology/approach: Regression analysis is used. The authors apply both a core audit fee...... determinants model and an audit fee change model and include interaction terms. Findings: The authors find short-term fee reductions in companies switching to single audits, but only where the former joint audit contained a dominant auditor. The authors argue that in this situation bargaining power is more...... with the auditors than in a equally shared joint audit, and that the auditors' incentives to offer an initial fee discount are bigger. Research limitations/implications: The number of observations is constrained by the small Danish capital market. Future research could take a more qualitative research...

  9. Goniometry in limited joint mobility

    S Gopinath

    2012-01-01

    Full Text Available Aim: To study about the utility of goniometry in screening for limited joint mobility (LJM in patients attending a secondary level Diabetic Clinic. Materials and Methods: Randomly selected data of 100 patients attending a secondary level diabetic clinic without any complications were used. Baseline neuropathy assessments, namely monofilament and biothesiometry were done. Range of movement around the ankle joint and 1 st metatarsal joint was done using goniometry. Both the results were compared. Inclusion Criteria: Selected 100 patients attending a secondary level diabetic clinic and on regular follow-up were included in the study. Exclusion Criteria: Sick patients requiring parenteral feeds, IV antibiotics, co-morbid conditions such as microvascular complication, autonomic gastroparesis, and diabetic foot infections were excluded from the study. Conclusion: Goniometric screening for LJM is a cheap and effective screening tool for detecting early structural deformity producing a higher plantar pressure and ulcer, and thereby preventing them at early stage.

  10. Joint US/German Conference

    Gulledge, Thomas; Jones, Albert

    1993-01-01

    This proceedings volume contains selected and refereed contributions that were presented at the conference on "Recent Developments and New Perspectives of Operations Research in the Area of Production Planning and Control" in Hagen/Germany, 25. - 26. June 1992. This conference was organized with the cooperation of the FernuniversiHit Hagen and was jointly hosted by the "Deutsche Gesellschaft fur Operations Research (DGOR)" and the "Manufacturing Special Interest Group of the Operations Research Society of America (ORSA-SIGMA)". For the organization of the conference we received generous financial support from the sponsors listed at the end of this volume. We wish to express our appreciation to all supporters for their contributions. This conference was the successor of the JOInt ORSA/DGOR-conference in Gaithersburg/Maryland, USA, on the 30. and 31. July 1991. Both OR-societies committed themselves in 1989 to host joint conferences on special topics of interest from the field of operations research. This goal ...

  11. Denervation of the wrist joint.

    Buck-Gramcko, D

    1977-01-01

    A collective review was made of the results of denervation of the wrist joint for painful restrictiorn of motion done in 313 patients and follow-up studies on 195 (average 4.1 years, ranging from 9 months to 14 years). Complete denervation was done in only 30, partial denervation in the others being done after testing with local anesthetic blocks. Sixty-nine of the patients retained a moble wrist without pain or with slight pain with heavy work. No evidence of Charcot-like joints was seen. Poorest results followed when the operation was done for sequelae of intra-articular fracture of the radius, fracture dislocations, unstable ligamentous support, joint surface destruction, or for those required to do heavy manual labor. Arthrodesis was done secondarily in nine patients. PMID:839055

  12. Rheumatoid arthritis affecting temporomandibular joint

    Amandeep Sodhi

    2015-01-01

    Full Text Available Rheumatoid arthritis (RA is a chronic, systemic, autoimmune inflammatory disorder that is characterized by joint inflammation, erosive properties and symmetric multiple joint involvement. Temporomandibular joint (TMJ is very rare to be affected in the early phase of the disease, thus posing diagnostic challenges for the dentist. Conventional radiographs fail to show the early lesions due to its limitations. More recently cone-beam computed tomography (CBCT has been found to diagnose the early degenerative changes of TMJ and hence aid in the diagnosis of the lesions more accurately. Our case highlights the involvement of TMJ in RA and the role of advanced imaging (CBCT in diagnosing the bony changes in the early phase of the disease.

  13. Torsion testing of bed joints

    Hansen, Klavs Feilberg; Pedersen, Carsten Mørk

    2008-01-01

    This paper describes a simple test method for determining the torsion strength of a single bed joint between two bricks and presents results from testing using this test method. The setup for the torsion test is well defined, require minimal preparation of the test specimen and the test can be...... carried out directly in a normal testing machine. The torsion strength is believed to be the most important parameter in out-of-plane resistance of masonry walls subjected to bending about an axis perpendicular to the bed joints. The paper also contains a few test results from bending of small walls about...... an axis perpendicular to the bed joints, which indicate the close connection between these results and results from torsion tests. These characteristics make the torsion strength well suited to act as substitute parameter for the bending strength of masonry about an axis perpendicular to the bed...

  14. Titanium template for scaphoid reconstruction.

    Haefeli, M; Schaefer, D J; Schumacher, R; Müller-Gerbl, M; Honigmann, P

    2015-06-01

    Reconstruction of a non-united scaphoid with a humpback deformity involves resection of the non-union followed by bone grafting and fixation of the fragments. Intraoperative control of the reconstruction is difficult owing to the complex three-dimensional shape of the scaphoid and the other carpal bones overlying the scaphoid on lateral radiographs. We developed a titanium template that fits exactly to the surfaces of the proximal and distal scaphoid poles to define their position relative to each other after resection of the non-union. The templates were designed on three-dimensional computed tomography reconstructions and manufactured using selective laser melting technology. Ten conserved human wrists were used to simulate the reconstruction. The achieved precision measured as the deviation of the surface of the reconstructed scaphoid from its virtual counterpart was good in five cases (maximal difference 1.5 mm), moderate in one case (maximal difference 3 mm) and inadequate in four cases (difference more than 3 mm). The main problems were attributed to the template design and can be avoided by improved pre-operative planning, as shown in a clinical case. PMID:25167978

  15. Dual joint space arthrography in temporomandibular joint disorders: Comparison with single inferior joint space arthrography

    Choi, Hyung Sik; Chang, Duk Soo; Lee, Kyung Soo; Kim, Woo Sun; Sung, Jung Ho; Jun, Young Hwan [Capital Armed Forces General Hospital, Seoul (Korea, Republic of)

    1989-02-15

    The temporomandibular joint(TMJ) is really a complex of two synovial space separated by fibrocartilaginous disc. Single inferior joint space arthrography is commonly performed for evaluation of TMJ disorders, which is known to be superior in demonstrating joint dynamics. But it reveals only the inferior surface of the disc. Therefore, dual space arthrography is superior to demonstrate the soft tissue anatomic feature of the joint such as disc position and shape. Authors performed 83 TMJ arthrograms in TMJ problems. Initially, the inferior joint space was done and then the superior space was sequentially contrasted. The follow results were noted: 1. In all cases, dual space arthrography revealed accurate disc shape and positions. 2. Concordant findings between the two techniques: 68 cases (82%). Discordance between the two techniques: 15 cases (18%) 3. Possible causes of discordance between inferior and dual space arthrography. a) Normal varians of anterior recess: 3 cases b) Posterior disc displacement: 4 cases c) Influence of the patient's head position change :4 cases d) False perforation: 2 cases e) Reduction change: 2 cases 4. In 5 cases with anterior displacement, dual space arthrography gave additional findings such as adhesion within the superior space, which could not be evaluated by single inferior space.

  16. Dual joint space arthrography in temporomandibular joint disorders: Comparison with single inferior joint space arthrography

    The temporomandibular joint(TMJ) is really a complex of two synovial space separated by fibrocartilaginous disc. Single inferior joint space arthrography is commonly performed for evaluation of TMJ disorders, which is known to be superior in demonstrating joint dynamics. But it reveals only the inferior surface of the disc. Therefore, dual space arthrography is superior to demonstrate the soft tissue anatomic feature of the joint such as disc position and shape. Authors performed 83 TMJ arthrograms in TMJ problems. Initially, the inferior joint space was done and then the superior space was sequentially contrasted. The follow results were noted: 1. In all cases, dual space arthrography revealed accurate disc shape and positions. 2. Concordant findings between the two techniques: 68 cases (82%). Discordance between the two techniques: 15 cases (18%) 3. Possible causes of discordance between inferior and dual space arthrography. a) Normal varians of anterior recess: 3 cases b) Posterior disc displacement: 4 cases c) Influence of the patient's head position change :4 cases d) False perforation: 2 cases e) Reduction change: 2 cases 4. In 5 cases with anterior displacement, dual space arthrography gave additional findings such as adhesion within the superior space, which could not be evaluated by single inferior space

  17. Two-Dimensional Impact Reconstruction Method for Rail Defect Inspection

    Jie Zhao

    2014-01-01

    Full Text Available The safety of train operating is seriously menaced by the rail defects, so it is of great significance to inspect rail defects dynamically while the train is operating. This paper presents a two-dimensional impact reconstruction method to realize the on-line inspection of rail defects. The proposed method utilizes preprocessing technology to convert time domain vertical vibration signals acquired by wireless sensor network to space signals. The modern time-frequency analysis method is improved to reconstruct the obtained multisensor information. Then, the image fusion processing technology based on spectrum threshold processing and node color labeling is proposed to reduce the noise, and blank the periodic impact signal caused by rail joints and locomotive running gear. This method can convert the aperiodic impact signals caused by rail defects to partial periodic impact signals, and locate the rail defects. An application indicates that the two-dimensional impact reconstruction method could display the impact caused by rail defects obviously, and is an effective on-line rail defects inspection method.

  18. Reconstructive foot and ankle surgeries in diabetic patients

    Ajit Kumar Varma

    2011-01-01

    Full Text Available Diabetic foot and ankle deformities are secondary to long-standing diabetes and neglected foot care. The concept of surgical correction for these deformities is quite recent. The primary objective of reconstructive foot and ankle surgery is the reduction of increased plantar pressures, reduction of pain and the restoration of function, stability and proper appearance. Foot and ankle deformities can result in significant disability, loss of life style, employment and even the loss of the lower limb. Therefore, restoration of normal, problem free foot function and activities will have a significant impact on peoples′ lives. Reconstructive surgical procedures are complex and during reconstruction, internal and external fixation devices, including pins, compression screws, staples, and wires, may be used for repair and stabilization. The surgeries performed depend on the type and severity of the condition. Surgery can involve any part of the foot and ankle, and may involve tendon, bone, joint, tissue or skin repair. Corrective surgeries can at times be performed on an outpatient basis with minimally invasive techniques. Recovery time depends on the type of condition being treated.

  19. CURRENT CONCEPTS IN ACL RECONSTRUCTION

    Freddie H. Fu

    2008-09-01

    Full Text Available Current Concepts in ACL Reconstruction is a complete reference text composed of the most thorough collection of topics on the ACL and its surgical reconstruction compiled, with contributions from some of the world's experts and most experienced ACL surgeons. Various procedures mentioned throughout the text are also demonstrated in an accompanying video CD-ROM. PURPOSE Composing a single, comprehensive and complete information source on ACL including basic sciences, clinical issues, latest concepts and surgical techniques, from evaluation to outcome, from history to future, editors and contributors have targeted to keep the audience pace with the latest concepts and techniques for the evaluation and the treatment of ACL injuries. FEATURES The text is composed of 27 chapters in 6 sections. The first section is mostly about basic sciences, also history of the ACL, imaging, clinical approach to adolescent and pediatric patients are subjected. In the second section, Graft Choices and Arthroscopy Portals for ACL Reconstruction are mentioned. The third section is about the technique and the outcome of the single-bundle ACL reconstruction. The fourth chapter includes the techniques and outcome of the double-bundle ACL reconstruction. In the fifth chapter revision, navigation technology, rehabilitation and the evaluation of the outcome of ACL reconstruction is subjected. The sixth/the last chapter is about the future advances to reach: What We Have Learned and the Future of ACL Reconstruction. AUDIENCE Orthopedic residents, sports traumatology and knee surgery fellows, orthopedic surgeons, also scientists in basic sciences or clinicians who are studying or planning a research on ACL forms the audience group of this book. ASSESSMENT This is the latest, the most complete and comprehensive textbook of ACL reconstruction produced by the editorial work up of two pioneer and masters "Freddie H. Fu MD and Steven B. Cohen MD" with the contribution of world

  20. The reconstruction of inflationary potentials

    Lin, Jianmang; Gao, Qing; Gong, Yungui

    2016-07-01

    The observational data on the anisotropy of the cosmic microwave background constraints the scalar spectral tilt ns and the tensor to scalar ratio r which depend on the first and second derivatives of the inflaton potential. The information can be used to reconstruct the inflaton potential in the polynomial form up to some orders. However, for some classes of potentials, ns and r behave as ns(N) and r(N) universally in terms of the number of e-folds N. The universal behaviour of ns(N) can be used to reconstruct a class of inflaton potentials. By parametrizing one of the parameters ns(N), ɛ(N) and φ(N), and fitting the parameters in the models to the observational data, we obtain the constraints on the parameters and reconstruct the classes of the inflationary models which include the chaotic inflation, T-model, hilltop inflation, s-dual inflation, natural inflation and R2 inflation.

  1. Network reconstruction from infection cascades

    Braunstein, Alfredo

    2016-01-01

    Reconstructing propagation networks from observations is a fundamental inverse problem, and it's crucial to understand and control dynamics in complex systems. Here we show that it is possible to reconstruct the whole structure of an interaction network and to simultaneously infer the complete time course of activation spreading, relying just on single snapshots of a small number of activity cascades. The method, that we called Inverse Dynamics Network Reconstruction (IDNR), is shown to work successfully on several synthetic and real networks, inferring the networks and the sources of infection based on sparse observations, including single snapshots. IDNR is built on a Belief Propagation approximation, that has an impressive performance in a wide variety of topological structures. The method can be applied in absence of complete time-series data by providing a detailed modeling of the posterior distribution of trajectories conditioned to the observations. Furthermore, we show by experiments that the informat...

  2. Reconstructing Ancient Forms of Life

    Benner, Steven A.

    1998-01-01

    Progress in the past three months has occurred in two areas, reconstruction of ancestral proteins and improved understanding of chemical features that are likely to be universal in generic matter regardless of its genesis. Ancestral ribonucleases have been reconstructed, and an example has been developed that shows how physiological function can be assigned to in vitro behaviors observed in biological systems. Sequence data have been collected to permit the reconstruction of src homology 2 domains that underwent radiative divergence at the time of the radiative divergence of chordates. New studies have been completed that show how genetic matter (or its remnants) might be detected on Mars (or other non-terrean locations.) Last, the first in vitro selection experiments have been completed using a nucleoside library carrying positively charged functionality, illustrating the importance of non-standard nucleotides to those attempting to obtain evidence for an "RNA world" as an early episode of life on earth.

  3. A Geometric Approach to Joint Inversion with Applications to Contaminant Source Zone Characterization

    Aghasi, Alireza; Mendoza-Sanchez, Itza; Miller, Eric L.; Ramsburg, C. Andrew; Abriola, Linda M.

    2013-01-01

    This paper presents a new joint inversion approach to shape-based inverse problems. Given two sets of data from distinct physical models, the main objective is to obtain a unified characterization of inclusions within the spatial domain of the physical properties to be reconstructed. Although our proposed method generally applies to many types of inversion problems, the main motivation here is to characterize subsurface contaminant source-zones by processing down gradient hydrological data an...

  4. Successful Fusion of the Proximal Tibiofibular Joint with Osteogenic Protein-1 (OP-1) Augmentation

    Delos, Demetris; Schneidkraut, Jason; Rodeo, Scott

    2012-01-01

    Proximal tibiofibular joint (PTFJ) instability is rare, but when encountered can be difficult to manage. Previously reported forms of treatment, including cast immobilization, soft tissue repairs and reconstructions, and fibular head resection have met with limited success. Another option is PTFJ arthrodesis—however, fusion can be difficult and ankle pain after surgery is not uncommon. In this report, we present a novel surgical technique used to treat PTFJ instability. It is a form of PTFJ a...

  5. Shape Reconstruction from Generalized Projections

    Viikinkoski, Matti

    2016-01-01

    In this thesis we develop methods for recovering the three-dimensional shape of an object from generalized projections. We particularly focus on the problems encountered when data are presented as discrete image fields. We demonstrate the usefulness of the Fourier transform in transferring the image data and shape model projections to a domain more suitable for gradient based optimization. To substantiate the general applicability of our methods to observational astronomy, we reconstruct shape models for several asteroids observed with adaptive optics, thermal infrared interferometry, or range-Doppler radar. The reconstructions are carried out with the ADAM software package that we have designed for general use.

  6. Reconstructing WKB from topological recursion

    Bouchard, Vincent

    2016-01-01

    We prove that the topological recursion reconstructs the WKB expansion of a quantum curve for all spectral curves whose Newton polygons have no interior point (and that are smooth as affine curves). This includes nearly all previously known cases in the literature, and many more; in particular, it includes many quantum curves of order greater than two. We also explore the connection between the choice of ordering in the quantization of the spectral curve and the choice of integration divisor to reconstruct the WKB expansion.

  7. Prosthesis of the wrist-joint

    Feldmeier, C.

    1983-02-25

    Function of the hand-joint and the well-being of patients can be severely affected by arthrosis of the wrist-joint. Therapeutically, arthrodesis usually results in a painfree status of stiffness. A painless and well functioning joint can be achieved by alloplastic joint replacement or resurfacing. The possibilities and clinical results in cases of arthrosis of the carpo-metacarpal joint of the thumb, pseudarthrosis of the scaphoid, aseptic necrosis of the Lunate and severe arthrosis of the radio-carpal joint are demonstrated.

  8. Prosthesis of the wrist-joint

    Function of the hand-joint and the well-being of patients can be severely affected by arthrosis of the wrist-joint. Therapeutically, arthrodesis usually results in a painfree status of stiffness. A painless and well functioning joint can be achieved by alloplastic joint replacement or resurfacing. The possibilities and clinical results in cases of arthrosis of the carpo-metacarpal joint of the thumb, pseudarthrosis of the scaphoid, aseptic necrosis of the Lunate and severe arthrosis of the radio-carpal joint are demonstrated. (orig.)

  9. Complex motion tomography of the sacroiliac joint

    To find a better method for diagnosing sacroiliac (SI) joint disease, an anatomical approach was combined with conventional roentgenology, complex motion tomography and computed tomography. Complex motion tomography is suggested as the method of choice in the investigation of the SI-joint. Because of its complex (sinusoidal) form, the dorsal portion of the joint has to be tomographed in frontal projection and the middle and ventral portions in oblique projection. In 56 patients, referred for probable ankylosing spondylitis, 72 SI joints were investigated. Based on plain radiography six and on frontal tomography five SI joints were diagnosed as normal. However, based on oblique tomography 31 joints were diagnosed as normal. (orig.)

  10. What Determines Joint Venture Termination?

    Nielsen, Bo Bernhard

    2012-01-01

    Joint venture (JV) research continues to flourish as researchers seek to advance our understanding of why so many JVs fail. Cui and Kumar (this issue) take a contingency approach to explain how and why business relatedness may provide new insights as to what determines JV termination. This...

  11. Joint Attention and Anthropological Difference

    Urban, Petr

    2014-01-01

    Roč. 11, č. 1 (2014), s. 59-70. ISSN 1718-0198 R&D Projects: GA ČR GAP401/10/1164 Institutional support: RVO:67985955 Keywords : joint attention * anthropological difference * phenomenology * great apes * shared intentionality Subject RIV: AA - Philosophy ; Religion

  12. Joint energy program makes progress

    2007-01-01

    @@ "Clean Energies Facing the Future," a cooperative research program jointly organized by CAS and the BP Group, has made encouraging progress, say experts at an annual sum-up workshop held on 31 July and I August at Tsinghua University in Beijing. The CAS Dalian Institute of Chemical Physics(DICP) has been entrusted as coordinator of the cooperative program between the two sides.

  13. Imaging of hip joint arthroplasty

    The hip joint is the largest joint in the human body and consequently, its evaluation by diagnostic imaging is highly important. This includes imaging of hip joint arthroplasty, which is used to avoid joint immobility following a wide spectrum of diseases, such as end-stage degenerative disease, avascular necrosis of the femoral head or post-traumatic fractures. Conventional radiography is still the standard imaging modality for the evaluation of hip arthroplasty both directly following surgery and for periodical follow-up. In the majority of cases conventional radiography enables adequate assessment of early and late complications that can arise following hip arthroplasty, such as loosening, prosthetic or periprosthetic fracture, luxation, infection and soft tissue calcification. If the diagnosis cannot be established by means of radiography, advanced imaging methods such as computed tomography (CT) and magnetic resonance imaging (MRI), with or without injection of contrast media, may provide additional information. This is particularly true for the depiction of inflammatory processes. Regardless of the imaging modality used patients' clinical symptoms must also be taken into account in order to establish the correct diagnosis. (orig.)

  14. 7th International Workshop on Boosted Object Phenomenology, Reconstruction and Searches in HEP

    2015-01-01

    BOOST2015 is the seventh of a series of successful joint theory/experiment workshops which bring together the world leading experts from theory and the Tevatron and LHC experiments to discuss the latest progress and develop new approaches on the reconstruction and use of boosted decay topologies as search tools for new physics. This year, the workshop is hosted by the University of Chicago.

  15. Proprioception and Clinical Results of Anterolateral Single-Bundle Posterior Cruciate Ligament Reconstruction with Remnant Preservation

    Lee, Dung Chul; Shon, Oog Jin; Kwack, Byung Hoon; Lee, Sung Jun

    2013-01-01

    Purpose To evaluate the clinical and radiological results and proprioception following anterolateral single-bundle posterior cruciate ligament (PCL) reconstruction with remnant preservation for PCL injury. Materials and Methods Twenty patients with an isolated PCL injury (16 males and 4 females) were included in this study. The mean follow-up period was 61 months (≥24 months) and the mean age of the patients was 36 years. Knee joint instability was evaluated using posterior drawer stress radi...

  16. Biomechanics of the anterior cruciate ligament: Physiology, rupture and reconstruction techniques

    Domnick, Christoph; Raschke, Michael J.; Herbort, Mirco

    2016-01-01

    The influences and mechanisms of the physiology, rupture and reconstruction of the anterior cruciate ligament (ACL) on kinematics and clinical outcomes have been investigated in many biomechanical and clinical studies over the last several decades. The knee is a complex joint with shifting contact points, pressures and axes that are affected when a ligament is injured. The ACL, as one of the intra-articular ligaments, has a strong influence on the resulting kinematics. Often, other meniscal o...

  17. Soft tissue influence on ex vivo mobility in the hip of Iguana: comparison with in vivo movement and its bearing on joint motion of fossil sprawling tetrapods.

    Arnold, Patrick; Fischer, Martin S; Nyakatura, John A

    2014-07-01

    The reconstruction of a joint's maximum range of mobility (ROM) often is a first step when trying to understand the locomotion of fossil tetrapods. But previous studies suggest that the ROM of a joint is restricted by soft tissues surrounding the joint. To expand the limited informative value of ROM studies for the reconstruction of a fossil species' locomotor characteristics, it is moreover necessary to better understand the relationship of ex vivo ROM with the actual in vivo joint movement. To gain insight into the relationship between ex vivo mobility and in vivo movement, we systematically tested for the influence of soft tissues on joint ROM in the hip of the modern lizard Iguana iguana. Then, we compared the ex vivo mobility to in vivo kinematics of the hip joint in the same specimens using X-ray sequences of steady-state treadmill locomotion previously recorded. With stepwise removal of soft tissues and a repeated-measurement protocol, we show that soft tissues surrounding the hip joint considerably limit ROM, highlighting the problems when joint ROM is deduced from bare bones only. We found the integument to have the largest effect on the range of long-axis rotation, pro- and retraction. Importantly, during locomotion the iguana used only a fragment of the ROM that was measured in our least restrictive dissection situation (i.e. pelvis and femur only conjoined by ligaments), demonstrating the discrepancy between hip joint ROM and actual in vivo movement. Our study emphasizes the necessity for caution when attempting to reconstruct joint ROM or even locomotor kinematics from fossil bones only, as actual in vivo movement cannot be deduced directly from any condition of cadaver mobility in Iguana and likely in other tetrapods. PMID:24762236

  18. Missed Monteggia fracture in children: Is annular ligament reconstruction always required?

    Bhaskar Atul

    2009-01-01

    Full Text Available Background: Chronic (neglected radiocapitellar joint dislocation is one of the feared complications of Monteggia fractures especially when associated with subtle fracture of the ulna bone. Many treatment strategies have been described to manage chronic Monteggia fracture and the need for annular ligament reconstruction is not always clear. The purpose of this study is to highlight the management of missed Monteggia fracture with particular emphasis on utility of annular ligament reconstruction by comparing the two groups of patients. Materials and Methods: In a prospective study 12 patients with mean age of 7.4 years, who presented with neglected Monteggia fractures, were studied. All children underwent open reduction of the radiocapitellar joint. Five children (Group A were treated with angulation-distraction osteotomy of ulna and annular ligament reconstruction and six cases (Group B required only angulation-distraction osteotomy of ulna without ligament reconstruction. In one case an open reduction of the radiocapitellar joint was sufficient to reduce the radial head and this was included in Group B. The gap between injury and presentation was from 3 months to 18 months (mean 9 months. Ten patients were classified as Bado I, and one each as Bado II and III respectively. We used the Kim′s criteria to score our results. Result: The mean follow-up period was 22 months. All ulna osteotomies healed uneventfully. The mean loss of pronation was 15 degree in Group A and 10 degree in Group B. Elbow flexion improved from the preoperative range and no child complained of pain, deformity and restriction of activity. The elbow score was excellent in 10 cases, and good in two cases. Conclusion: Distraction-angulation osteotomy of the ulna suffices in most cases of missed monteggia fracture and the need for annular ligament reconstruction is based on intraoperative findings of radial head instability.

  19. Paleoenvironmental reconstruction using microfossils : terrestrial

    The following section provides a brief summary of the use of pollen and chironomids in terrestrial paleoenvironmental reconstruction and lists some key references and general text addressing the history, methods and development of these techniques in Quaternary paleoclimate research and their application in New Zealand. (author). 52 refs., 8 figs

  20. Reconstructing Indo-European Syllabification

    Byrd, Andrew Miles

    2010-01-01

    The chief concern of this dissertation is to investigate a fundamental, yet unsolved problem within the phonology of Proto-Indo-European (PIE): the process of syllabification. I show that by analyzing the much more easily reconstructable word-edge clusters we may predict which types of consonant clusters can occur word-medially, provided that we…