RADIOGRAPHIC COURSE AFTER ACETABULOPLASTY AND FEMORAL OSTEOTOMY IN HIP-DYSPLASIA

The radiographic course of 101 hips with residual dysplasia treated wi th roof plasty combined with intertrochanteric varus derotation osteot omy using the osteotomy wedge as a roof graft after Mittelmeier were r eviewed, The average followup period was 8.8 years, The acetabular ang le was improved by an average of 16 degrees (postoperative mean, 19 de grees; average at followup, 18 degrees), The center edge angle also wa s improved by 16 degrees and was stable at 25 degrees average at follo wup, The neck shaft angle, abnormal in 70% of hips preoperatively, was reduced by the varus osteotomies to a mean of 111 degrees and showed a spontaneous postoperative increase to normal values of an average of 129 degrees, There was no correlation of the postoperative increase o f the neck shaft angle to patient age, preoperative valgus extension, correction angle, or length of followup, In nearly all cases, an almos t anatomic joint shape was achieved, With a complication rate of only 1%, especially regarding the rate of necroses of the femoral head, the presented surgical technique can be recommended as highly effective, reliable, and safe for the treatment of congenital hip dislocation.