Studies on hemiarthroplasty for osteonecrosis of the femoral head.

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Post-operative radiological and clinical results were studied in 23 cases with 30 joints of osteonecrosis of the femoral head after hemiarthroplasty. The cases consisted of 15 men and 8 women, aged from 2 3 to 74, with an average age of 46.1. The original disorders of the osteonecrosis were idiopathic in 15 cases, SLE in 4, steroids in 3 and alcoholism in one. Pre-hemi-arthroplasty procedures had been performed in 5 cases: transtrochanteric rotation osteotomy in 2, intertrochanteric varus osteotomy in one, and strut bone graft in 2.<BR>The prostheses used in this series were the Moore type in 3 joints, the Bateman type in 12, the Osteonics type in 8, and the PCA type in 7.<BR>Radiological studies showed that there was one case of proximal migration in the Moore type and 6 cases of distal miglation, 2 each in the Moore type, the Bateman type, and the Osteonics type. Two cases of stem loosening were also observed in the Osteonics type. With the exception of these cases of proximal migration and stem loosening, post-operative clinical evaluation revealed good results with an average point score of 80.3 by the JOA assessment criteria.
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