What is a Bankart lesion characterized by?

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A Bankart lesion is characterized specifically by the avulsion of the anterior-inferior labrum from the glenoid rim. This injury often occurs in the context of shoulder dislocations, particularly when the humeral head dislocates anteriorly. The mechanism behind this kind of lesion usually involves a forcible external rotation and abduction of the arm, which can lead to a tear at the labrum where the ligaments connect.

This type of injury is clinically significant because it can contribute to recurrent shoulder dislocations and instability due to the compromised attachment of the ligaments that stabilize the shoulder joint. The presence of a Bankart lesion is typically evaluated via imaging modalities, such as MRI or arthroscopy, which can help diagnose the avulsion and guide treatment.

In contrast, the other options represent different types of shoulder injuries or conditions. A posterior-superior humeral head impaction refers to a different mechanism of injury involving the compression of the bone at the humeral head during a traumatic event. A medial shoulder capsule tear involves a separate area of soft tissue injury, and a fracture of the anatomical neck represents a bony injury rather than a labral one. Thus, the defining feature of a Bankart lesion is specifically related to the anterior-inferior

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