Accurately matched hemiarthroplasty for the treatment of avascular necrosis of the femoral head

Release date: 2007-01-19

This study aimed to assess the effectiveness of precisely matched hemiarthroplasty in treating avascular necrosis of the femoral head. A retrospective analysis was conducted on 41 patients (48 hips) who underwent metal hemiarthroplasty. The patient group included 30 males and 11 females, with ages ranging from 29 to 49 years, averaging 37 years. Among the cases, 35 hips were classified as Ficat stage III, and 13 as Ficat stage IV. The acetabulum was found to be relatively normal in all cases.

Patients were followed up for an average of 5.2 years. The results showed a significant improvement in the UCLA hip function score (P = 0.001). Preoperatively, pain scores increased from 3.1 to 9.1 points, walking improved from 4.4 to 9.2 points, and activity levels rose from 5.5 to 7.1 points. According to the UCLA scoring system, the satisfaction rate for Ficat III hips was 88.6%, while it was 69.2% for Ficat IV hips (P = 0.25). However, eight hips showed poor outcomes, with no significant improvement in their UCLA scores.

Postoperative X-rays revealed that seven hips had a varus position, where the angle between the implanted stem and the femoral axis was less than 130°. The 5-year survival rate of the prosthesis was 83%. Overall, the study concluded that when surgical indications are strictly controlled and surgical techniques are refined, the accuracy and outcomes of semi-hip surface replacement for avascular necrosis of the femoral head are quite satisfactory.

— Information from: Meditech Medical Network

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