[Radiological changes in uncemented acetabular components. Apropos of 77 hybrid total hip prostheses reviewed with 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 acetabular component were reviewed retrospectively after a mean follow-up of 3.5 years. Clinical outcomes were similar to those seen with cemented implants. Roentgenographic analysis of acetabular position detected 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 after reaming was the only factor that significantly influenced the likelihood of acetabular component migration. Increased acetabular density after previous conservative hip surgery was associated with a significant reduction in the risk of migration (p = 0.003). Because anchorage quality was not predictable, we discontinued use of cementless acetabular components.