Five-12 year results of 72 total hip arthroplasties were reviewed with emphasis placed on the radiologic evaluation of the acetabular and femoral components by Charnley' s method at an average follow-up period of 7.7 years.
Their mean age at surgery was 57.4 years (range, 30-76 years). About sixty per cent of the sockets had no cement-bone demarcation and 22.2% had a small line in the upper outer quadrant of the socket. In ten hips (13.9%), socket demarcation was complete, and in three cases (4.2%), migration was identified. The mean rate of socket wear that was followed up for more than nine years was 0.06mm per year. Fracture of the femoral cement was found in 10 hips (13.9%), and demarcation around the femoral bone-cement interface in 10 hips. Eight hips (11.1%) were judged to have femoral loosening.
The revision rate of the socket was 2.8% and of the femoral prosthesis was 5.6%.
