Research ArticlesSurgical Management of Bony Encasement of the Ulnar Nerve Secondary to Heterotopic Ossification of the ElbowSalazar, Dane MD*; Lee, Woo-Seung MD†; Aghdasi, Bayan MD*; Golz, Andrew BS*; Israel, Heidi PhD‡; Marra, Guido MD§Author Information *The Department of Orthopaedic Surgery and Rehabilitation, Loyola University Health System, Maywood §Department of Orthopaedic Surgery, Northwestern University, Feinberg School of Medicine, Chicago, IL †Department of Orthopedic Surgery, Veterans Health Service Medical Center, Dunchon-dong, Gangdong-gu, Seoul, Republic of Korea ‡Department of Orthopaedic Surgery, Saint Louis University, St. Louis, MO G.M. is a consultant for Biomet Zimmer. The remaining authors declare no conflict of interest. Reprints: Dane Salazar, MD, The Department of Orthopaedic Surgery and Rehabilitation, Loyola University Health System, 2160 South First Avenue, Maywood, IL 60153 (e-mail: [email protected]). Techniques in Shoulder & Elbow Surgery: December 2018 - Volume 19 - Issue 4 - p 145-152 doi: 10.1097/BTE.0000000000000157 Buy Metrics Abstract Heterotopic ossification (HO) is the most common extrinsic cause of elbow contracture. However, associated ulnar neuropathy at the elbow due to HO is uncommon. The purpose of the study is to describe the surgical management and investigate the effect of operative treatment of HO about the ulnar nerve on neuropathic symptoms. A retrospective review of all patients treated with bony encasement of the ulnar nerve secondary to HO over a 13-year period was performed. All patients underwent surgery for clinically symptomatic or debilitating HO of the elbow. Each patient received HO prophylaxis postoperatively. Subjects underwent regimented physical therapy and utilized a continuous passive motion machine in the postoperative period. Eighteen elbows with complete bony encasement of the ulnar nerve were identified (13 burns, 4 trauma, 1 closed head injury). There was a statistically significant decrease in ulnar neuropathy symptoms, as evidenced by a reduction of mean McGowan grade (1.5 to 1, P<0.02). Twenty-five percent of symptomatic patients (4/16) had complete resolution of their neuropathy symptoms. The mean arc of motion improved from 14 to 98 degrees following surgery and rehabilitation. Comparison of preoperative and postoperative motion demonstrated a statistically significant improvement in elbow extension, flexion, and total arc of motion (P<0.01). Average time from initial visit until surgery was 266 days (range, 76 to 797 d), while mean postoperative follow-up was 16 months (range, 1 to 51 mo). Surgical management combined with postoperative HO prophylaxis may be an effective treatment for treating patients with HO of the elbow with bony encasement of the ulnar nerve, resulting in superior range of motion and improved or resolved ulnar neuropathy. Level of Evidence: Level IV. Copyright © 2018 Wolters Kluwer Health, Inc. All rights reserved.