Modified Chiari Pelvic Osteotomy for Dysplastic Hip

Yoon, Taek Rim; Cho, Sang Gwon; Song, Eun Kyoo; Seon, Jong Keun; Bae, Bong Hyun; Kong, Il Kyu

Abstract

PURPOSE
To evaluate the clinical, radiographic results of a modified Chiari osteotomy for dysplastic hips associated with early osteoarthritis.
MATERIALS AND METHODS
17 dysplastic hip patients were examined, and treated with modified Chiari osteotomy, which is dome-shaped pelvic osteotomy. Their mean age at surgery was 33.5 years old (range: 14-53 years), and the mean follow-up period was 28.2 months (range: 12-73 months). In the clinical evaluation, limping, range of motion and Harris Hip Score (HHS) were used and in the radiographic evaluation, center edge angle, acetabular angle, head coverage, weight bearing joint space and minimal joint space were evaluated.
RESULTS
Six out of 13 patients who had an antalgic gait improved, and the level of abduction, internal rotation and external rotation showed significant improvement at the final follow-up. The radiographic results showed that the acetabular angle improved significantly from 47.5degrees preoperatively to 40.0degrees at the last follow-up. The center edge angle showed significant improvement from 9.9degrees preoperatively to 38.5degrees at the last follow-up and the head coverage also showed significant improvement from 57.9% preoperatively to 82.4% at the last follow-up.
CONCLUSION
A modified Chiari osteotomy is an effective method for a dysplastic hip with a mild and moderate grade of osteoarthritis, and shows improved clinical and radiographic results.