Dislocation and Component Separation of the Bateman Hip Endoprosthesis

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Abstract
THE BATEMAN hip prosthesis has been used at Northwestern University Medical Center since its introduction three years ago. As indicated by Bateman, the primary indications for this prosthesis are fractures of the femoral head and neck, nonunion of the femoral neck, selected instances of avascular necrosis of the femoral head, and revision of conventional femoral-head prostheses. This prosthesis can also be employed electively in certain cases of posttraumatic arthritis and osteoarthritis and rheumatoid arthritis that preponderantly involve the femoral head.1 This bipolar-type prosthesis has certain advantages over the Austin-Moore-type prosthesis and the Charnley- or Mueller-type total hip prosthesis. Motion within the double-head assembly of the Bateman permits less motion in the acetabulum, thus providing better acetabular wear and less chance of dislocation.1 Unusual postoperative complications of the Bateman prosthesis were found in two patients. Both patients required reoperation, thus subjecting them to the further risks of infection and

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