Excision for the treatment of periarticular ossification of the knee in patients who have a traumatic brain injury

Background: Patients who are comatose after a traumatic brain injury often have heterotopic periarticular ossification that can be treated with excisi on to improve the range of motion of the joint; Methods: Areas of periarticular ossification were resected at an average of twenty-three months after recovery from a coma in seven knees of five pati ents who had a traumatic brain injury. Before the procedure, all of the kne es were fixed in a flexed position that ranged from 10 to 40 degrees and th ey had a painful are of motion that ranged from 20 to 70 degrees of flexion , None of the patients could walk, and some of them could barely sit in a w heelchair. At the end of the operation, the are of motion was markedly impr oved in all of the knees (0 to 130 degrees in three knees, 0 to 120 degrees in three, and 10 to 120 degrees in one). In an attempt to prevent postoper ative loss of motion and recurrence of the ossification, continuous passive motion was applied to the involved knee: for six weeks before a full rehab ilitation program was started. The latest follow-up evaluation was at an av erage of thirty-four months (range, twenty-five to sixty months). Results: At the time of follow-up, all of the patients could walk and all o f the knees were pain-free. One knee had an are of flexion of 0 to 90 degre es; two, an arc of 10 to 100 degrees; one, an are of 5 to 110 degrees; two, an are of 0 to 120 degrees; and one, an are of 0 to 130 degrees. Ossificat ion did not recur in any of the knees. Conclusions: Patients,vith good neuromuscular control had the best general functional result, The routine use of a continuous-passive-motion machine w as associated with no recurrence of ossification, and there was some late l oss of motion after its use was discontinued.