Bony lesions of the glenohumeral joint are important risk factors that often lead to recurrent anterior shoulder dislocation. A Hill-Sachs lesion is defined as bone loss from the posterior-superior aspect of the humeral head due to a compression fracture. It has been shown that the Hill-Sachs lesion is present in about 80% of initial dislocation cases and almost 100% of recurrent dislocations cases. The importance of the engaging Hill-Sachs lesion has been described by Burkhart and De Beer. The lesion is considered “engaging” when its long axis is parallel to the anterior glenoid, with the shoulder in a functional position of humero-thoracic abduction and external rotation.

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