Humeral head bone defects (Hill-Sachs lesions) are caused by anterior shoulder dislocation with impaction of the posterosuperior humeral head onto the anterior glenoid rim. Frequently, these bony lesions are associated with glenohumeral instability, and large lesions may contribute to recurrent instability after failure of a soft tissue repair. To improve outcomes and minimize the risk of persistent instability, a thorough understanding of the biomechanics of humeral bone loss is required. Detection and quantification of clinically relevant humeral head bone loss are performed through an accurate history, physical examination, and interpretation of imaging studies. The diagnosis and treatment options for reverse Hill-Sachs lesions are discussed, and the various treatment options for Hill-Sachs lesions are reviewed, including operative techniques to limit engagement of the deformity by soft tissue transfer, rotational osteotomy, bone grafting, or osteochondral transplantation.
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