[Biomechanical parameters for planning Chiari's pelvic osteotomy].

A Chiari osteotomy was performed in a macerated female pelvis specimen and the medialization of the distal pelvic segment bearing the hip joint was simulated within a range from 0-2.5 cm. In relation to the medialization different biomechanical hip-parameters were measured as well from the specimen as from the x-ray. For practical purpose the Wiberg CE angle towards the edge of the original acetabulum and the CE' angle towards the edge of the acetabular shelf are important parameters for preoperative calculation of the required amount of medialization.