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The Journal of Bone and Joint Surgery 80:420-3 (1998)
© 1998 The Journal of Bone and Joint Surgery, Inc.

Failure of the Polyethylene after Bipolar Hemiarthroplasty of the Hip. A Report of Five Cases*

THOMAS F. CALTON, M.D.{dagger}, THOMAS K. FEHRING, M.D.{ddagger}, WILLIAM L. GRIFFIN, M.D.{ddagger} and THOMAS H. MCCOY, M.D.{ddagger}, CHARLOTTE, NORTH CAROLINA

Investigation performed at Charlotte Orthopaedic Research Institute, Charlotte


   Introduction
 
Bipolar hemiarthroplasty was introduced in the early 1970s. The theoretical advantages of bipolar compared with unipolar components include increased range of motion and stability as well as decreased wear of the acetabulum. Bipolar components have been used extensively for patients who have a fracture of the femoral neck. The indications for the use of a bipolar component have been broadened to include avascular necrosis of the femoral head, degenerative osteoarthrosis, and revision hip arthroplasty.

Polyethylene wear and subsequent osteolysis have been recognized as problems in association with fixed acetabular components. Bipolar implants are also susceptible to failure of the bearing surface and its sequelae. The polyethylene wear associated with a bipolar implant is difficult to measure radiographically because of the design of the implant. The purpose of the current report is to demonstrate that polyethylene wear and subsequent osteolysis also occur with this type of implant. We report the cases . . . [Full Text of this Article]


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