[The results of Chiari's medial displacement osteotomy].

Results of follow-up investigations on 45 patients with hip operated between 1968 and 1973 after the method of Chiari are reported by the authors. The post-operative development of the C.E. angle (Wiberg) and of the acetabular inclination angle (v. Lanz) are discussed. Attention is drawn to the necessity of X-ray films taken in a second projection (Fauxprofil view). With the aid of arthrography of the hip joint it is demonstrated that the most important demands of acetabulum formation surgery, namely the antomical congruence of the joint components, can be achieved by means of pelvic osteotomy after the method of Chiari.