054 THE 22-TO 34 YEARS OUTCOME OF CHARNLEY LOW FRICTION ARTHROPLASTY IN YOUNG PATIENTS WITH OSTEOARTHRITIS

Abstract

We reported on the outcome of 84 Charnley low friction arthroplasties performed by one of us (GH), the period 1973 to 1984, in 69 patients, less than fifty-five years old, with osteoarthritis mainly due to congenital hip disease.

The patients were followed prospectively; clinically using the Merle D’Aubigné and Postel scoring system, as modified by Charnley and also radiographically.

At the time of the latest follow-up, thirty-seven hips had failed (44%). In thirty-two hips, twenty-eight acetabular and thirty femoral components were revised because of aseptic loosening (six of the femoral components were broken). Three hips were infected and converted to resection arthroplasty. In two more hips a periprosthetic femur fracture occurred three and ten years postoperatively and were treated with internal fixation. After a minimum of twenty-two years from the index operation, 37 original acetabular components and 36 original femoral components were in place for an average of 29 years. The probability of survival for both components with failure for any reason as the end point was 0.51 (95% confidence interval, 0.39 to 0.62) at twenty-five years when 35 hips were at risk.

These long term results can be used as a benchmark of endurance of current total hip arthroplasties performed in young patients, with OA mainly due to congenital hip disease.