Early Remodeling of Acetabular Roof after Posterior Rotational Osteotomy in Femoral Head Necrosis with Joint Narrowing
T Atsumi, T Kajiwara, Y Hiranuma, S Tamaoki, Y Asakura, J Suzuki
Department of Orthopaedic Surgery, Fujigaoka Hospital, Showa University
School of Medicine, Yokohama, Japan

Purpose: Osteonecrosis of the femoral head with joint space narrowing in young patients aged less than fifty years old was treated with posterior rotational osteotomy. Changes of acetabular roof were observed after operation. Early remodeling of acetabular roof after operation was studied radiographically.

Patients and Methods: 18 hips of 15 patients treated by posterior rotational osteotomy were subjected for this study. Age of the patients was 15 to 50 (mean:36). 11 patients were women, 4 were men. The etiologic factors were steroids administration in 9, alcoholic abuse in 1, no apparent factor in 1, traumatic in 7. Changes of acetabular roof on antero-posterior radiographs were observed on 6 months, 1 year and 2 years postoperatively. Atrophic change and uniform shape of acetabular roof was studied in each period.

Results: 6 months after operation, atrophic change was noted on all 18 hips. None of uniform shape was found. Atrophic change of 10 hips (56%) was found 1 year postoperatively. Shape of acetabular roof was improved and uniformed in 8 hips. In all 18 hips 2 years after operation, shape of acetabular roof was remodeled and uniformed.

Conclusions: From these results, we thought acetabular roof of femoral head involving necrosis with joint narrowing was remodeled on early period postoperatively.