Acute fracture of the proximal humerus superimposed on a chronic posterior dislocation of the humeral head.

We have reported the case of a 73-year-old woman with a posterior shoulder dislocation and comminuted fracture of the proximal humerus occurring during a seizure. Surgery disclosed an acute humeral fracture superimposed on a chronically dislocated humeral head. Endoprosthetic replacement yielded a satisfactory clinical result. We found no similar report in the literature.