[Clinical study on the prevention of heterotopic ossification after total hip arthroplasty by Xiaozhong Zhitong].

Objective: To explore the therapeutic effects of Xiaozhong Zhitong mixture preventing heterotopic ossification (HO) after total hip arthroplasty.

Methods: From July 2006 to October 2009, 154 patients underwent total hip replacement surgery were randomly divided into sham group (group A, 50 cases), indomethacin group (group B, 55 cases) and Xiaozhong Zhitong mixture group (group C, 49 cases). Among 154 patients, 9 cases were primary osteoarthris, 34 cases osteoarthritis secondary to acetabular dysplasia, 98 cases osteoarthritis secondary to avascular necrosis of the femoral head, 2 cases rheumatoid arthritis, 5 cases femoral neck fracture, 6 cases other diseases.