The Journal of Bone and Joint Surgery, Vol 74, Issue 9 1344-1346, Copyright © 1992 by Journal of Bone and Joint Surgery, Inc
Prophylaxis with indomethacin for heterotopic ossification after Chiari osteotomy of the pelvis
G Randelli and CL Romano
Centro dell'Anca Displasica, Istituto Ortopedico Gaetano Pini, Milan, Italy.
One hundred patients who had painful dysplasia of the hip were treated with
a Chiari osteotomy of the pelvis, and the postoperative radiographs were
reviewed for the development of heterotopic ossification. Sixty patients
did not receive indomethacin postoperatively, and eighteen (30 per cent)
had heterotopic ossification of at least class 1; forty patients received
indomethacin for two weeks postoperatively, and only three (8 per cent) of
them had heterotopic ossification. This difference was significant (p <
0.025). No class-3 or 4 heterotopic ossification was seen in the patients
who were given indomethacin. The prevalence of side-effects was relatively
low, and no delayed union of the osteotomy was observed in any patient. We
concluded that indomethacin, in the dosage schedule and regimen that we
used, provides effective prophylaxis for heterotopic ossification after a
Chiari pelvic osteotomy.