Hill Sachs lesion An injury to the humeral head known as a Hill-Sachs lesion happens when the humerus is forcibly pulled away from the glenoid fossa, which features the shoulder joint. When the humeral head strikes the glenoid fossa's edge during a traumatic dislocation of the shoulder joint, a defect in the posterolateral quadrant is caused. Who are at risk? Younger patients participating in high-impact activities, including athletes or military veterans, are more likely to develop the Hill-Sachs lesion. Additionally, it can happen in older people with shoulder joint degeneration or those who have a history of frequent shoulder dislocations. Classification According to the proportion of the humeral head that is affected, the severity of a Hill-Sachs lesion is classified, with larger lesions indicating a higher risk of shoulder instability and recurrent dislocations. Depending on how much of the humeral head is affected, Hill-Sachs lesions are categorized. The severity of the inju