Acetabular development after Salter's innominate osteotomy for congenital dislocation of the hip: Evaluation by three-dimensional quantitative method

Three-dimensional assessment of acetabular coverage of the femoral head was made fur 30 patients with unilateral congenital dislocation of the hip und ergoing Salter's innominate osteotomy for residual subluxation. Radiologic examinations were serially performed until bone maturity, and the final ace tabular coverage was evaluated by a quantitative method with a computer pro gram developed by Konishi and Mieno. At the final examination, no significa nt differences be tween the involved and unaffected sides were found in ter ms of the total coverage or posterior-half coverage. The anterior-half cove rage and the anterior-to-posterior ratio of the involved side were signific antly greater (73.7 and 97.8%, respectively) than the values for the unaffe cted side (68.8 and 90.8%). In conclusion, the anterior inclination of dist al fragment that is obtained by Salter's innominate osteotomy continues unt il bone maturation. However, remodeling of the posterior part of the acetab ulum occurs by growth after the operation.