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.