I difetti ossei omerali nella lussazione anteriore di spalla

Bony defect of the humeral head associated with anterior glenohumeral instability is called Hill-Sachs lesion. These defects occur when the postero-lateral aspect of the dislocated humeral head impacts against the glenoid rim. The term engaging Hill-Sachs lesion describes a defect in the humeral head large enough such that the edge would drop over the glenoid rim in external rotation. The new concept of glenoid track could explain the risk of engagement and dislocation of a Hill-Sachs lesion.