Perthes and reverse Bankart lesions
Recurrent shoulder dislocations
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Avulsion of the anterior glenoid labrum which remains attached to the scapular periosteum. The posterior glenoid labrum is detached from the glenoid and seen at the posterior joint space. Depressed fracture of the posterolateral aspect of the humeral head with surrounding bone marrow edema.
Mild joint effusion is also noted which extends around the long head of biceps tendon.
The rotator cuff muscles are intact.
Anterior shoulder dislocation accounts for the vast majority of shoulder dislocations and usually results from forced abduction, external location and extension. Bankart and Hill Sachs lesions are usually associated with anterior dislocation. Perthes lesion occurs when the anterior inferior labrum is avulsed from the glenoid but still attached to the scapular periosteum, and is also seen with anterior glenohumeral injuries. Reverse Bankart lesion is associated with posterior dislocation.