What is the difficulty in the treatment of anterior shoulder dislocation?

     For recurrent anterior shoulder dislocation, the standard treatment in the early years was arthrotomy repair. The shoulder joint is usually opened through an anterolateral incision, which splits the subscapularis muscle on the anterior aspect of the humeral head and exposes the articular capsule-glenoid labrum structure on its undersurface for repair. The basic repair is to re-sew the avulsed glenoid labrum back to the scapular glenoid and then stagger the joint capsule (Figure 4). For general shoulder dislocations, arthrotomy repair is effective in preventing recurrence of the dislocation. However, because of the large trauma and interference with the subscapularis muscle, postoperative shoulder abduction and external rotation functions are mostly significantly limited. Although patients do not have a high recurrence rate of postoperative shoulder dislocation, they are instead dissatisfied because of the effect of this procedure on daily function and movement. The incision procedure has the greatest impact on those patients whose occupation is throwing sports, and the chances of resuming throwing sports after surgery are low. The use of arthroscopic techniques in the shoulder joint has brought light to the repair of shoulder dislocations. Although the basic arthroscopic repair is still to re-sew the avulsed capsule-glenoid labrum back to the scapular glenoid, this procedure does not incise the joint and also avoids damage to the subscapularis muscle, with minimal impact on postoperative shoulder abduction and external rotation function and high patient satisfaction. With the popularity of shoulder arthroscopy, the routine treatment for recurrent anterior shoulder dislocation is now arthroscopic capsule-glenoid labrum repair. The key repair step in arthroscopic repair is to pin the avulsed capsule-glenoid labrum back to the scapular glenoid. Typically, 3-4 wire anchors are used to nail the anchors to the scapular glenoid, and then the wire is used to pull the capsule-glenoid labrum back into the scapular glenoid (Figure 5). For the surgeon, the learning curve for arthroscopic repair of anterior shoulder dislocation is long. In the early stages of application, the recurrence rate of post-arthroscopic shoulder dislocation is higher than that of incisional repair. However, once the technique matures, it can achieve similar or better results than incisional repair in preventing recurrence of dislocation. Currently, arthroscopic glenoid labral repair of the joint capsule is gradually becoming popular in China.  The dilemma of surgical treatment of recurrent anterior shoulder dislocation.  However, as a surgeon, mastering the arthroscopic capsule-glenoid labrum repair technique does not mean that everything is fine, but only the beginning of the technique, because the results of arthroscopic capsule-glenoid labrum repair are still far from satisfactory. The incidence of recurrent anterior shoulder dislocation after arthroscopic re-dislocation is 5-15%. When patients with no recurrence of dislocation but instability or significant pain are included, the overall failure rate after shoulder dislocation may be 10-30%, with a failure rate of up to 2/3 in some patient groups.  Studies have shown that there are a number of factors that predispose to failure after shoulder dislocation repair. The first factor is age. The younger the patient, the higher the failure rate. This is related to the injury characteristics of the younger patient, the healing characteristics after repair, and the stresses placed on the shoulder joint after repair. Second, the level of exercise or athletic status. Those who play competitive sports have a higher failure rate than those who play recreational sports, and those who play recreational sports have a higher failure rate than those who do not play sports. Third, the type of sport. The failure rate is higher in those who engage in confrontational sports and strong abduction and external rotation (posterior upper arm swing) activities. Fourth, excessive laxity of the joint capsule or joint capsule defects. The greater the overall joint capsule laxity and the greater the joint capsule defect, the higher the failure rate of the procedure. Fifth, bone defects of the scapular glenoid and humeral head. The higher the degree of bone defect, the higher the rate of surgical failure.  The surgeon needs to analyze the predisposing factors for each patient, and master and adopt surgical techniques other than arthroscopic capsulo-glenoid repair to eliminate or circumvent the effects of these predisposing factors, thus reducing the failure rate.