Analysis of the results of the C-Fit uncemented total hip arthroplasty in young patients with hydroxyapatite or porous coating of components

Young patients at 2 separate centers received a C-Fit uncemented arthroplas ty, with randomization to porous or hydroxyapatite coating. No difference i n survival could be found between components that were porous or hydroxyapa tite coated, with 27.5% being revised within 8 years, mainly for aseptic lo osening. Acetabular augmentation screws or offset acetabular liners similar ly did not affect outcome. Two of the offset liners had spun within the met al acetabular liners, with early failure. Some of the survivors showed poor clinical scores, but there was no correlation between clinical score and r adiographic evidence of loosening. These results are comparable to the poor est reported survival figures in the literature for uncemented prostheses. Prosthesis coating could not be shown to affect component survival for this prosthesis.