Prevention of heterotopic ossification by nonsteroid antiinflammatory drugs after total hip arthroplasty.

• The effect of three weeks of postoperative treatment with indomethacin or ibuprofen on the development of periarticular heterotopic ossification (PHO) after bilateral total hip arthroplasty (THA) was investigated. Widespread PHO did not occur in 31 patients who had been treated with indomethacin or ibuprofen after both operations. Thirty-eight patients had been treated after one but not the other THA. Widespread PHO occurred in 14 of 38 untreated THA, but was not found after THA on the treated side. These findings are indicative of an inhibitory effect of nonsteroid antiinflammatory drugs on the development of PHO, since the development of severe heterotopic ossification is strongly correlated between the two sides after bilateral THA.

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