From 1983 to 1994, Chiari pelvic osteotomies were performed in 881 hips for treatment of secondary coxarthrosis with dysplasia.
435 hips (397 patients) were the subjects of this study. There were 40 male and 357 female patients with an average age at the time of operation of 36 years, ranging from 13 to 64 years.
Incidence of migration after only Chlari's procedure had been performed increased significantly in the advanced and terminal stages.
Incidence of migration in subjects treated with the combined procedure which included valgus osteotomy was high, 71 hips out of 136 (52.2%). But the incidence was less in patients with a combined varus osteotomy; 6 hips out of 42 (14.3%).
However, clinical results were not related to the degree of migration. Our results indicate that mild migration of the femoral head is an adaptation of the newly formed acetabulum.
