Clinical and radiological results of hydroxyapatite-coated acetabular cups

We prospectively studied a consecutive series of 60 primary total hip arthroplasties in 52 patients. All patients had a hydroxyapatite-coated hemispherical acetabular cup (OCTOFIT). Mean patient age was 52.5 (34–73) years. In 38 hips, a 28-mm and in 22 hips a 32-mm diameter cobalt-chrome femoral head was used. We could follow 53 hips for a mean of 81 (28–125) months. Four cups were revised because of osteolysis, and in another six cups, slight osteolysis without migration was seen. The average annual linear wear rate was 0.05 mm (±0.05) for 28-mm heads and 0.16 mm (±0.09) for 32-mm heads (p<0.0001). Survivorship analysis predicted a survival rate of 86±6.7% at 10 years.