Objective To testify the spatial relationship between the subscapularis muscle splitting window and the axillary nerve in modified arthroscopic Latarjet procedure, which could provide anatomical basis for the modification of the subscapularis muscle splitting. MethodsA total of 29 adult cadaveric shoulder specimens were dissected layer by layer, and the axillary nerve was finally confirmed to walk on the front surface of the subscapularis muscle. Keeping the shoulder joint in a neutral position, the Kirschner wire was passed through the subscapularis muscle from back to front at the 4 : 00 position of the right glenoid circle (7 : 00 position of the left glenoid circle), and the anterior exit point (point A, the point of splitting subscapularis muscle during Latarjet procedure) was recorded. The vertical and horizontal distances between point A and the axillary nerve were measured respectively. Results In the neutral position of the shoulder joint, the distance between the point A and the axillary nerve was 27.37 (19.80, 34.55) mm in the horizontal plane and 16.67 (12.85, 20.35) mm in the vertical plane. Conclusion In the neutral position of the shoulder joint, the possibility of axillary nerve injury will be relatively reduced when radiofrequency is taken from the 4 : 00 position of the right glenoid (7 : 00 position of the left glenoid circle), passing through the subscapularis muscle posteriorly and anteriorly and splitting outward.
Objective To evaluate the mid-term effectiveness of limited unique coracoid osteotomy suture button fixation Latarjet (LU-tarjet) procedure in treatment of recurrent anterior shoulder dislocation. Methods Between March 2017 and February 2019, 56 patients with recurrent shoulder dislocation were treated with arthroscopic LU-tarjet procedure. There were 44 males and 12 females with an average age of 26.3 years (range, 18-41 years). Shoulder joint dislocation occurred 2-16 times, with an average of 7.5 times. The time from the initial dislocation to operation ranged from 6 months to 13 years, with a median of 4.6 years. Preoperative shoulder joint fear test and re-reduction test were positive in all patients. The Beighton score of joint relaxation ranged from 1 to 7, with an average of 4.1. The shoulder Instability Severity Index Score (ISIS) ranged from 5 to 10, with an average of 7.8. The size of glenoid defects on the affected side ranged from 15% to 32% (mean, 22.4%). All patients had Hill-Sachs injuries of varying degrees. Six patients had re-dislocation after Bankart surgery. The operation time, incision healing, and postoperative complications were recorded. The range of motion (shoulder flexion, extension, abduction, external rotation, 90° external rotation, and internal rotation) and muscle strength in shoulder flexion, abduction, external rotation, and internal rotation) of shoulder joint were compared between pre- and post-operation. The improvement of shoulder function was evaluated using the American Association for Shoulder and Elbow Surgery (ASES) score, Walch-Duplay score, and Rowe score. X-ray films and three-dimensional CT were used to analyze the location, healing, and remolding of bone graft, the repair of glenoid defect, and degenerative changes of the shoulder joint. Results All operations were successfully completed. The operation time ranged from 42 to 98 minutes, with an average of 63 minutes. All incisions healed by first intention. All patients were followed up 5-7 years (mean, 6.3 years). During follow-up, 2 patients experienced shoulder subluxation within 1 year after operation and 1 patient experienced recurrent shoulder joint pain. The remaining patients had no related complications. At last follow-up, there was no significant difference between the two groups (P>0.05) in range of motion (shoulder flexion, extension, abduction, external rotation, 90° external rotation, and internal rotation) and muscle strength in shoulder flexion, abduction, external rotation, and internal rotation). The ASES score, Rowe score, and Walch-Duplay score of shoulder significantly improved when compared with those before operation (P<0.05). Postoperative CT showed that 53 cases (94.64%) of coracoid bone masses were centered placed vertically, 2 cases (3.57%) were superior, and 1 case (1.79%) was inferior; 49 cases (87.50%) of the coracoid bone grafts were flush with the glenoid, 2 cases (3.57%) and 5 cases (8.93%) were medially and laterally positioned. The volume of coracoid bone graft decreased first and then increased, and the shape of the bone graft was continuously remodeling and gradually matched with the track of the humerus head (the optimal circle of the glenoid), all coracoid bone grafts healed. At last follow-up, the coverage rate of optimal glenoid circle was 89.6%-100%, with an average of 97.4%. The area of glenoid defect was 2.6%±1.3%, which significantly decreased when compared with preoperative (22.4%±5.4%) (P<0.05). At last follow-up, no obvious degenerative changes of shoulder joint was observed. ConclusionLU-tarjet procedure for recurrent anterior shoulder dislocation has good mid-term effectiveness with short operation time and few complications.
ObjectiveTo investigate the morphological characteristics of the glenohumeral joint (including the glenoid and coracoid) in the Chinese population and determine the feasibility of designing coracoid osteotomy based on the preoperative glenoid defect arc length by constructing glenoid defect models and simulating suture button fixation Latarjet procedure. MethodsTwelve shoulder joint specimens from 6 adult cadavers donated voluntarily were harvested. First, whether the coracoacromial ligament and conjoint tendon connected was anatomically observed and their intersection point was identified. The vertical distance from the intersection point to the coracoid, the maximum allowable osteotomy length starting from the intersection point, and the maximum osteotomy angle were measured. Next, the anteroinferior glenoid defect models of different degrees were randomly constructed. The arc length and area of the glenoid defect were measured. Based on the arc length of the glenoid defect of the model, the size of coracoid oblique osteotomy was designed and the actual length and angle of the coracoid osteotomy were measured. A limited osteotomy suture button fixation Latarjet procedure with the coracoacromial ligament and pectoralis minor preservation was performed and the position of coracoid block was observed. ResultsAll shoulder joint specimens exhibited crossing fibers between the coracoacromial ligament and the conjoint tendon. The vertical distance from the tip of the coracoid to the coracoid return point was 24.8-32.2 mm (mean, 28.5 mm). The maximum allowable osteotomy length starting from the intersection point was 26.7-36.9 mm (mean, 32.0 mm). The maximum osteotomy angle was 58.8°-71.9° (mean, 63.5°). Based on the anteroinferior glenoid defect model, the arc length of the glenoid defect was 22.6-29.4 mm (mean, 26.0 mm); the ratio of glenoid defect was 20.8%-26.2% (mean, 23.7%). Based on the coracoid block, the length of the coracoid osteotomy was 23.5-31.4 mm (mean, 26.4 mm); the osteotomy angle was 51.3°-69.2° (mean, 57.1°). There was no significant difference between the arc length of the glenoid defect and the length of the coracoid osteotomy (P>0.05). After simulating the suture button fixation Latarjet procedure, the highest points of the coracoid block (suture loop fixation position) in all models located below the optimal center point, with the bone block concentrated in the anteroinferior glenoid defect position. ConclusionThe size of the coracoid is generally sufficient to meet the needs of repairing larger glenoid defects. The oblique osteotomy with preserving the coracoacromial ligament may potentially replace the traditional Latarjet osteotomy method.
ObjectiveTo investigate the mid-term effect of lateral placement of bone graft on shoulder joint degeneration after modified arthroscopic Latarjet surgery with elastic fixation for recurrent anterior shoulder dislocation with an anterior glenoid bone defect.MethodsAccording to the inclusion and exclusion criteria, 18 patients with recurrent anterior shoulder dislocation and anterior glenoid bone defect who received the modified arthroscopic Latarjet surgery with elastic fixation between January 2015 and November 2016 were enrolled in this study. There were 12 males and 6 females with an average age of 26.2 years (range, 19-37 years). The number of shoulder dislocation ranged from 4 to 30 times (mean, 8.8 times). The disease duration was 8-49 months (mean, 23.8 months). The mean anterior glenoid bone defect was 25.2% of the glenoid surface (range, 20%-29%). The mean preoperative Instability Severity Index Score (ISIS) was 7.6 (range, 7-10). According to Samilson-Prieto classification, the shoulder joint degeneration was rated as grade 0 in 13 cases, grade Ⅰ in 3 cases, and grade Ⅱ in 2 cases. Before and after operation, the visual analogue scale (VAS) score, American Society of Shoulder and Elbow Surgery (ASES) score, Walch-Duplay score, Rowe score, and shoulder mobility were used to evaluate the effectiveness. Imaging examination was performed to observe the shoulder joint degeneration, the position of the bone graft, and the postoperative shaping of the scapular glenoid.ResultsAll patients were followed up 55-62 months, with an average of 59.6 months. There was no neurovascular injuries, infections, fixation-related and bone graft-related complications. No re-dislocation and revision occurred. All patients returned to normal life, 17 of whom returned to sport. The VAS score was significantly decreased and ASES, Walch-Duplay, and Rowe scores were significantly improved at last follow-up (P<0.05). No significant difference was found in range of motion of forward flexion, abduction, lateral rotation at 90° abduction, internal rotation at 90° abduction, or lateral rotation at 0° between pre- and post-operation (P>0.05). Three-dimensional CT showed that the centers of all bone grafts were between 3∶30 and 4∶30 (right shoulder) or between 7∶40 and 8∶20 (left shoulder) and no bone grafts were positioned superiorly or inferiorly in the glenoid En-face view. All bone grafts were positioned lateral to the scapular glenoid with an average distance of 3.5 mm (range, 2.3-4.6 mm) in cross-sectional imaging by CT. Compared with the preoperative Samilson-Prieto classification results, all cases showed no progression of shoulder joint degeneration at 36, 48 months and last follow-up. All bone grafts remodeled to a steady state within 24 months after operation. The bone graft and glenoid finally remodeled analogous to the shape of the intact glenoid in the En-face view and became flush with the glenoid rim, remodeling to a curved shape congruent to the humeral head in cross-sectional imaging by CT. The shape of the remodeled glenoid at last follow-up was not significantly different from that at 24 months after operation.ConclusionThe lateral placement of the bone graft during modified arthroscopic Latarjet surgery with elastic fixation do not accelerate the imaging changes of shoulder joint degeneration.