Resection of Heterotopic Ossification of the Elbow: A Comparison of Ankylosis and Partial Restriction

PurposeThis study tests the hypothesis that the results of release of elbow stiffness related to heterotopic ossification (HO) are comparable whether there is partial or complete restriction (ankylosis) of flexion and extension.MethodsEighteen patients who had surgical release of complete bony ankylosis between the humerus and ulna were retrospectively compared to 27 matched patients who had surgical release of partial restriction of elbow flexion and extension related to HO. Patients were evaluated a minimum of 10 months after surgery, using the Disabilities of the Arm, Shoulder, and Hand questionnaire and the Broberg and Morrey rating system.ResultsAn average of 22 months after surgery (range, 10 to 62 mo), the arc of flexion and extension averaged 95° in the ankylosis cohort and 93° in the partial HO cohort. Forearm rotation averaged 131° versus 134°; the mean Disabilities of the Arm, Shoulder, and Hand score was 28 versus 30 points; and the mean Broberg and Morrey score was 81 versus 84 points, respectively.ConclusionsAfter controlling for other factors, patients with elbow stiffness related to HO can recover comparable motion after surgical release at short-term follow-up whether they have complete ankylosis or only partial restriction of motion.Type of study/level of evidenceTherapeutic III.