[Salter's single-stage bilateral pelvic osteotomy].

45 children (3 years 9 months old in average), suffering from congenital dislocation of the hip or acetabular dysplasia have sustained a bilateral innominate osteotomy in a single stage. Two different operative procedures have been used: "simultaneous osteotomy" (15 children) and "successive osteotomy" (30 children). The post-operative follow-up lasted 4 years 3 months. On both sides, the correction of acetabular deformity was obtained, the average value of the acetabular angle which was 36.6 in a pre-operative state, being 17.1 post-operative and 11.5 at the last follow-up. Complications were rare (3 superficial infections, 1 Kirschner wires migration and 2 hip instabilities which called for a capsulorraphy). The results were excellent for 83 hips, fair for 3 hips in 3 children (asymmetrical shift of the osteotomy) and poor for 4 hips in 3 children (who were contraindications of the Salter's osteotomy). The authors conclude that one-step bilateral innominate osteotomy is viable and simple. It makes a second operation unnecessary and results in a better angular gain compared to that obtained after unilateral osteotomy.