Abstract
We report here on our technical improvement of the Chiari pelvic osteotomy, and its procedure in which the Smith-Petersen approach is used and the lateral side of the iliac crest is osteotomied by chisel. Between 1981 and 1989, 83 patients (91 hips) were treated by Chiari pelvic Osteotomy, 14 men and 69 women ranging in age at surgery from 10 to 58 years. The average age was 30.2. The follow-up period ranged from one to 8 years with an average of 2.8. Clinical results, evaluated by JOA hip score and X-ray findings (sharp angle, slope of acetabular edge, acetabulo-head index and CE angle), were good except in one case in which degeneration of the hip joint had advanced after operation. The results of remodelling of the new acetabular were especially excellent in the 56 hips in which the height of the osteotomy from the acetabular edge was less than 1 mm on X-rays. Chiari pelvic osteotomy is a useful method for treating osteoarthritis of the hip, and it is important that pelvic osteotomy be performed within 1 mm from the acetabular edge.
