Radiographic Evaluation of Salter Innominate Osteotomies for Congenital Dislocation of the Hip.

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We studied 49 Salter innominate osteotomies carried out on 46 patients for treatment of residual subluxation after primary reduction of congenital dislocation of the hip. The average age at surgery was 3 years and 3 months (ranging from 1.5 years to 5 years and 7 months) and the average duration of follow-up was 7 years and 4 months (ranging from 3 to 13 years). The preoerative, postoperative and current acetabular angel, CE angle and AHQ of each patient were measured and analyzed. Both the acetabular angle and CE angle showed improvement up to the latest follow-up, but AHQ showed a decrease between the post-operative and current scores. However, this decrease in AHQ was not statistically significant. These results indicate that the acetabulum widened in accordance with enlargement of the femoral head. Better results were obtained in cases with suspected intracapsular obstruction when the concentricity was improved by the Salter innominate osteotomy in combination with open reduction. Twenty-four of the above 49 cases which showed progressive enlargement of the femoral head over 4 years were reported in 1989. Although the average AHQ of these 24 cases decreased, this was not statistically significant.