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Biomechanical effects of the Chiari pelvic osteotomy with femoral osteotomies were evaluated using two dimensional computer simulation by Kawai's rigid body-spring model. The author made three models of the pelvis ; normal, acetabular dysplasia and after Chiari, and four femoral models; normal, after varus osteotomy, after curved varus osteotomy and after valgus osteotomy. Both group of models were combined respectively. Their biomechanical effects were evaluated. The results were as follows. 1) The resultant force on the femoral head after Chiari osteotomy was less than that of the normal pelvis. 2) The Biomechanical condition of acetabular dysplasia with a valgus osteotomy was the worst in these 12 hip joint models. 3) Chiari pelvic osteotomy alternated the biomechanical condition of acetabular dysplasiawith valgus osteotomy. 4) The biomechanical effects were different between varus osteotomy and curved varus osteotomy.

A biomechanical analysis of the Chiari pelvic osteotomy with femoral osteotomies using computer simulation.