Late hemarthrosis from a threaded acetabular component.

Abstract

Painful hemarthrosis 6 months after total hip arthroplasty resulted from erosion of the anterior hip capsule over exposed threads of a threaded acetabular component. The capsular laceration occurred in an area of bone deficiency at the anterior acetabular lip underlying the psoas tendon. The diagnosis was made at the time of surgical exploration. Threaded sockets should be contained by bone in the area of these structures to prevent this previously undescribed complication.