Structural bone grafting in arthroplasty for congenital hip dysplasia - 35hips followed for 5-10 years

We assessed 35 hip arthroplasties in 30 patients with an average follow-up of 7 years. AII patients suffered from secondary osteoarthrosis due to cong enital dysplasia The mean age at the time of surgery was 54 (19-77) years. Part of the femoral head used as a graft was fixed to the superolateral reg ion of the acetabulum. A 100% bone coverage of the acetabular component was achieved initially. The mean support by the graft was 34%. The graft size, measured in the AP view, decreased on average 29% after 7 years. The resor ption caused a reduction in cup coverage to 94%. There was no correlation b etween the clinical outcome and the graft size. Graft: resorption occurred in the horizontal and vertical axes, but hardly affected the contact region with the iliac bone. Radiolucent lines according to DeLee were found in zo ne I in 4, zone II in 6 and zone III in 7 cases. The Harris Hip Score impro ved from 37-85 points. 1 revision was necessary 7 months postoperatively af ter cup dislocation.