Survival analysis of cementless grit-blasted titanium total hip arthroplasties

Although about 200 000 cementless Zweymuller-Alloclassic total hip arthropl asties (THAs) were carried out worldwide in the last decade, the survival a nalysis of these prostheses was not available in the 2000 report of the Swe dish national hip arthroplasty registry. We report a prospective survivorsh ip analysis of 200 consecutive grit-blasted cementless Alloclassic primary THAs carried out since 1988. Using surgical, clinical and radiological endpoints for the stem and the th readed cup the ten-year survivorship was 91.5% for reoperation for any caus e, 96.4% for hip pain (Merle d'Aubigne score < 5 points, clinical failure), 99.4% for definite aseptic loosening (radiological failure) and 99.3% for revision for aseptic loosening. Using the Swedish registry criteria of prim ary osteoarthritis and revision for aseptic loosening as the endpoint, the survival rate of 99.1% at ten years for the subgroup of 157 Alloclassic THA s in osteoarthritis compares favourably with that of the best modern cement ed hip replacements reported in the Swedish arthroplasty registry.