MECHANICAL STABILITY OF THE CEMENTLESS ACETABULAR COMPONENT WITH 3 SPIKES

We studied the stability of our cementless acetabular component (socke t) with 3 spikes in 65 joints of 65 patients who were followed for ove r 5 years. In 1 case, there was osteolysis around the femoral componen t (stem) but not around the socket. The movement of the socket and the radiolucent Line was observed in 11 cases of osteoarthritis with acet abular hypoplasia (a mean of J3 degrees of the sharp angle) and 3 case s with rapidly destructive coxarthrosis. We could obtain favorable sta bility in 50 patients, including 38 with osteoarthritis (a mean of 41 degrees of the sharp angle), 8 with aseptic necrosis, 2 with rapidly d estructive coxarthrosis, and 2 with rheumatoid arthritis. Our socket i s very effective in preventing osteolysis and is expected to provide m ore stable mechanical stability by arranging an insertion angle (35 de grees of the optimal open angle and 10 degrees of the anteversion angl e) and a full bone graft in osteoarthritic patients.