Mechanical stability of the cementless acetabular component with three spikes

We studied the stability of our cementless acetabular component (socket) with 3 spikes in 65 joints of 65 patients who were followed for over 5 years. In 1 case, there was osteolysis around the femoral component (stem) but not around the socket. The movement of the socket and the radiolucent line was observed in 11 cases of osteoarthritis with acetabular hypoplasia (a mean of 43 degrees of the sharp angle) and 3 cases with rapidly destructive coxarthrosis. We could obtain favorable stability in 50 patients, including 38 with osteoarthritis (a mean of 41 degrees of the sharp angle), 8 with aseptic necrosis, 2 with rapidly destructive coxarthrosis, and 2 with rheumatoid arthritis. Our socket is very effective in preventing osteolysis and is expected to provide more stable mechanical stability by arranging an insertion angle (35 degrees of the optimal open angle and 10 degrees of the anteversion angle) and a full bone graft in osteoarthritic patients.