Hill-Sachs Lesion

The shoulder is the most mobile and the most commonly dislocated large joint in the body. Dislocation means that the joint is moved out of position, such that the joint surfaces at the ends of the bones are no longer in contact. In the shoulder, most dislocations are anterior (moving forward from the body); however, they can occur in other directions. When a dislocation occurs, the soft tissues that stabilize the shoulder can be torn.

Traumatic dislocations of the shoulder can result in a Hill-Sachs lesion, often in addition to other soft-tissue injuries. The head of the humerus (ball of upper arm bone) is stabilized against the glenoid (socket of the shoulder joint) using a combination of muscles, labrum, and ligaments