We study difference in polyethylene-wear and osteolysis around acetabular cups between ceramic (Alumina) and metal (Cobalt-Chrome) heads in total hip arthroplasty. We have followed three different patient materials from randomised trials for ten years with radiostereometry (RSA). The results from two of the materials show more than 50 % reduced wear with ceramic heads compared to metal heads. The analyses from the last material are not finished. With regard to development of osteolysis around the cups we have not found any significant differences, but there is a tendency towards more bone loss with metal heads. We have developed a new method for wear measurement with RSA. This method allows wear measurement with RSA without index RSA radiographs.
Radiostereometric analysis of hemiarthroplasties of the hip--a highly precise method for measurements of cartilage wear
Osteoarthritis Cartilage, 20 (1), 36-42