Case ReportsPosttraumatic Radioulnar Synostosis Treated With a Free Vascularized Fat Transplant and Dynamic Splint A Report of Two CasesMuramatsu, Keiichi; Ihara, Koichiro; Shigetomi, Mitsunori; Kimura, Koutaro; Kurokawa, Yoko; Kawai, Shinya Author Information From the Department of Orthopedic Surgery, Yamaguchi University School of Medicine, Yamaguchi, Japan. Accepted for publication February 13, 2003. Reprints: Keiichi Muramatsu, MD, Department of Orthopedic Surgery, Yamaguchi University School of Medicine, 1-1-1 Minami-Kogushi, Ube, Yamaguchi 755-8505, Japan. No benefits in any form have been received from a commercial party related directly or indirectly to the subject of this article. This article does not contain information about medical devices. Journal of Orthopaedic Trauma 18(1):p 48-52, January 2004. Buy Abstract Two cases of posttraumatic radioulnar synostosis are presented. The patients were treated with excision of the cross-union and interposition of a free vascularized fat transplant. A newly devised pronation-supination dynamic splint was employed for 3 months postoperatively in both patients. After a 1-year postoperative follow-up, an increased range of motion was restored in both cases, and there was no evidence of recurrent synostosis formation in subsequent radiographs. We suggest that an interposed vascularized fat graft may be an ideal biologic barrier to fill the space created by cross-union excision. © 2004 Lippincott Williams & Wilkins, Inc.