Since the complication of heterotopic ossification near the joints of patients with brain injury was first reported by Roberts in 1968, other studies have described the incidence, location, natural history and treatment of the lesion. But reports concerning the outcome of surgical resection of the osseous restriction to motion have been limited in number and scope, and studies to prevent recurrence after resection is especially rare. We reviewed 8 patients (6 hips and 3 elbows) who were treated by surgical resection and post-operative irradiation of heterotopic ossification after brain injury in Severance hospital between January, 1987 and June, 1991, and the following conclusions were obtained 1. Heterotopic ossification after brain injury in the hip were all located anteriorly and in the elbow two cases among three were located anteriorly. 2. After surgical resection of heterotopic ossification, we gained 77.5 degrees increment of range of motion in the hip and 73.3 degrees increment of range of motion in the elbow. 3. Post operative 1000 rads irradiation after surgical resection that was done from the day after operation was effective to prevent the recurrence of heterotopic ossification. Therefore, we think that good result will be obtained by surgical resection and post operative irradiation of heterotopic ossification that limit joint motion severely after brain injury.