Charnley total hip arthroplasty in ankylosing spondylitis - Survivorship analysis of 76 patients followed for 8-28 years

76 consecutive Charnley low friction hip arthroplasties were performed in 5 4 (37 men) patients with ankylosing spondylitis from 1971 to 1991 in the Rh eumatism Foundation Hospital, Their mean age was 40 (16-67) years. They wer e followed until the end of 1999, The overall prosthesis survival was 80% a t 10 years, 66% at 15 years and 62% at 20 years. The survival of the acetab ular component was 91%, 77% and 73% at 10, 15 and 20 years and that of the femoral component 82%, 79% and 77%, respectively. We found no significant r isk factor that predicted prosthesis survival.