Long-term results of treatment of patients with hip displasia by Ganz osteotomy

Aim. To analyze the long-term results of treatment of patients with arthrosis and hip dysplasia treated by Ganz osteotomy.

Methods. 71 patients operated by Ganz osteotomy in 1995-2010 were examined. A total of 83 joints were operated. Tonnis, Wiberg, Leguesne angles, joint medialization, head coating index were measured. The arthrosis degree was determined radiologically according to Tonnis classification. Patients included 58 women and 13 men. Hip joint status was evaluated using the Harris Hip Score (HHS) system.

Results. Ganz osteotomy resulted in radiological parameters improvement: Tonnis angles improved by 65.6%, Wiberg - by 5 times, Lequesne - by 6.7 times. Medialization improved by 18.2%, the coating index - by 40.3%. Radiological arthrosis degree according to Tonnis classification was 0 in 43 joints, 1 - in 4 joints before surgery. After surgery, during examination arthrosis degree was 0 - in 18 joints, 1 - in 38,2 - in 20,3 - in 7 cases. In 21 joints the transition from the 0 to the 1st arthrosis degree, in 4 joints - from 0 to the 2nd degree was registered. In 16 joints transition from the 1st to the 2nd arthrosis degree was registered, in 7 joints - from the 1st to the 3rd degree. As a result of the treatment hip joint functional parameters improvement was found, the HHS rate before the surgery was 62.6 points, after the surgery - 82.8 points. The minor and major complications rate measured up to 23 and 15% respectively.

Conclusion. Patients were examined 7.5 years after the surgery in average; in our series, total prostheses after osteotomy was performed in 3 patients (4 joints), in one case, due to postoperative subluxation Schanz osteotomy was performed; it was managed to preserve biological joint in 95.18% of cases.