Preventive effect of indomethacin on heterotopic ossification following total hip replacement: A non-randomized concurrent control study / 中国组织工程研究

ABSTRACT

AIM: To investigate the effect of indomethacin on prevention of heterotopic ossification (HO) after operative treatment of total hip replacement. METHODS: Forty patients taking indomethacin after total hip replacement were enrolled at First Hospital Affiliated to Zhengzhou University from February 2003 to February 2005 as medication group. Forty patients received the same operation were enrolled from February 1996 to February 1999 as control group. The patients in the medication group were taken indomethacin from the first day after operation, 50 mg/times, twice a day, for 3 weeks. The patients were successfully followed up immediately before the end of the operation, at weeks 3, 12, months 3, 6 and 12 after operation. Follow-up included X-ray at normal position of double hips, oblique position of obturator foramen and oblique position of iliac bone to assess the incidence of HO. Hip joint function was assessed according to modified d'Aubigne and Postel standards. RESULTS: Follow-up was performed in 40 patients of the medication group. The follow-ups averaged 21.2 months (ranged from 6 to 37 months). HO occurred in six cases. According to Brooker evaluation of HO, four cases were rated as degree Ⅰ, two as degree Ⅱ, and none as degree Ⅲ or Ⅳ. The incidence of HO was 15%. In the control group, totally 40 patients were followed up, averagely 27.1 months ranged from 5-60 months. The incidence of HO was 40% (16/40). Five patients developed severe HO. Significant differences were found in the incidence of HO and severe HO of the two groups (P