Rotational acetabular osteotomy for advanced osteoarthrosis secondary to dysplasia of the hip. Results at 6-11 years postoperatively.

Clinical and radiological studies were done on the results of rotational acetabular osteotomy for advanced osteoarthrosis secondary to dysplasia of 29 adult hips followed up for 6 to 11 years postoperatively (mean 8 years). Clinical evaluation by Merle d'Aubigne and Postel's system showed improvement from a preoperative mean of 12.8 to a follow-up mean of 14.8, with aggravation being observed in 8 joints. Radiologically, this procedure produced adequated improvement regarding femoral head coverage, but improvement in joint congruency could not necessarily be obtained due to joint deformity and progression of arthrosis, with aggravation of joint congruency being observed in 6 joints. The most important factor influencing the postoperative results of this procedure was postoperative joint congruency. If the postoperative joint congruency is satisfactory, with the joint congruent index being more than 6.0, progression of arthrosis can be prevented in the long term by this procedure, even in advanced cases.