Hill-Sachs Deformity

This is a patient who presents with chronic shoulder pain. Frontal and transcapular views of the shoulder were obtained. The frontal radiograph demonstrates an irregularity of the osseous contour of the superolateral and posterior humeral head as indicated by the red arrow. The green arrow indicates a small area of calcification along the proximal diametaphysis of the humerus. The location of this calcification is typical for a loose body within the biceps tendon sheath. This is an incidental findings and likely represents underlying cartilage disease. The transcapular view of the shoulder indicates that there is no evidence of an acute subluxation or dislocation. The irregularity of the superolateral humeral head is consistent with an old Hill Sachs deformity. These deformities are due to a prior anteroinferior dislocation where the posterior and superior humeral head impacts on the anteroinferior glenoid rim.