Abstract
Clinical results and problems encountered in bipolar endoprosthesis replacement for avascular necrosis of the femoral head were evaluated in 44 patients (57 hip joints) . Average age at the time of operation was 42 years and follow-up was for an average period of 78 months. The JOA hip score after surgery increased from 58.7 to 92.6 points. X-rays revealed migration of the outer head in 5 patients (8.8%), varus position of the outer head at the acetabulum in 7 (12.3%), varus angulation of the stem in the femoral medullar canal in 9 (15.8%), subsidence of the stem in 6 (10.5%), and a radiolucent zone in 19 (33.3%) . There was little relation, however, between clinical results and radiological findings. Complications included 3 infections, 1 dislocation, and 1 fracture of the polyethylene bearing insert.
