Chiari osteotomy. A, Young adult with painful, bilateral acetabular dysplasia, greater on left than on right. B, After Chiari osteotomy of left hip. Note optional internal fixation and medial bone grafting. C, Bilateral acetabular dysplasia in 12-year-old girl. D, After surgery, right hip is completely displaced. E, One year after Chiari osteotomy.