UNCEMENTED ACETABULAR COMPONENTS - ROENTG ENOLOGICAL CHANGES IN 77 TOTAL HIP-PROSTHESIS AFTER A MEAN FOLLOW-UP OF 3.5 YEARS

Seventy-seven total hip arthroplasty procedures performed between 1982 and 1989 for osteoarthritis by the same surgeon using a cementless ac etabular component were reviewed retrospectively after a mean follow-u p of 3.5 years. Clinical outcomes were similar to those seen with ceme nted implants. Roentgenographic analysis of acetabular position detect ed migration of 19 implants (25%). Actuarial survival analysis showed that the migration-free survival rate of acetabular components was 74. 5% nine years after insertion. Bony consistency of the acetabulum afte r reaming was the only factor that significantly influenced the likeli hood of acetabular component migration. Increased acetabular density a fter previous conservative hip surgery was associated with a significa nt reduction in the risk of migration (p=0.003). Because anchorage qua lity was not predictable, we discontinued use of cementless acetabular components.