Primary bipolar total hip arthroplasty.

A retrospective clinical and radiographic review of 140 primary total hip arthroplasties using a bipolar acetabular component and an uncemented AML femoral component (Depuy, Warsaw, IN) was done. The length of follow-up was from 2 to 5 years with a mean of 44.2 months. A mean postoperative Harris hip score of 84.3 points and a mean postoperative Harris pain score of 38.8 points were identified. Five hips required revision surgery, three for recurrent dislocations and two for infection. Nine percent of acetabular components were noted to have migrated within the bony pelvis by 2 mm or more. However, the presence of migration was not statistically associated with low pain or function scores. Ninety-eight percent of patients with surviving implants felt satisfied with the results of their surgery. Total hip arthroplasty using a bipolar acetabular component appears to be a successful method of hip replacement.