811 CHARNLEY HIPS FOLLOWED FOR 3-17 YEARS

10-12 year survivorship analysis of 811 primary or conversion Charnley arthroplasties showed 89 percent probability of mechanical survival ( revision excluding sepsis). The mechanical failure rate was 7 percent, and more stems required revision than sockets. The antero-posterior r adiographs of 630 unrevised hips, with a minimum 3-year follow-up, wer e evaluated using the CART system of terminology. Cement-bone radioluc ency was present in 50 percent of sockets and 18 percent of stems. Sub stantial loosening was present in 6 percent with 94 percent probabilit y of survival at 10-12 years.