Total Hip Arthroplasty with Hydroxyapatite-coated ABG® Hip Prosthesis: Minimum 5 Year Follow-up

Abstract

Purpose: To evaluate the clinical and radiological results of total hip arthroplasty (THA) with a hydroxyapatite (HA)-coated (Anatomical Benoist Giraud, Howmedica, Europe) hip prosthesis. Materials and Methods: From March 1992 to December 1996, we performed 204 total hip arthroplasty with HA-coated hip prosthesis. This study included 142 hips. The causes of THA were osteonecrosis of the femoral head (122 hips), osteoarthritis (16 hips) and infection sequalae (4 hips). Clinical results were evaluated using Harris hip score. We observed osteointegration, cortical hypertrophy, reactive line around femoral stem, subsidence, polyethylene wear, osteolysis and radiolucent line around acetabular cup on the follow-up radiographs. Results: Harris hip score was an average of 84.5 points at last follow-up. Only one femoral stem was revised for loosening. Reactive lines around uncoated portion of femoral stem was observed in 70 hips. The cortical hypertrophy was observed at zone 2, 3, 5 and 6 in 46 hips. Forty-five acetabular cups (31.7%) were revised. The causes of cup revision wereolyethylene liner wear and osteolysis (24 hips), loosening (19 hips) and recurrent dislocation (2 hips). Conclusion: We found that the HA-coated femoral stem had high survival rate at minimum 5 years follow-up after THA, but acetabular cup had high revision rate for loosening and osteolysis.