Tehran University of Medical Sciences Journal of Orthopedic and Spine Trauma 2538-2330 1 1 2015 07 28 107 107 Leila Oryadi Zanjani Department of Orthopaedic and Trauma Surgery, Shariati Hospital, Tehran University of Medical Sciences, Tehran, IR Iran Reza Shahryar Kamrani Department of Orthopaedic and Trauma Surgery, Shariati Hospital, Tehran University of Medical Sciences, Tehran, IR Iran Yousof Fallah Department of Orthopaedic and Trauma Surgery, Imam Khomeini Hospital, Tehran University of Medical Sciences, Tehran, IR Iran Mohammad Hossein Nabian Department of Orthopaedic and Trauma Surgery, Shariati Hospital, Tehran University of Medical Sciences, Tehran, IR Iran 2019 07 18 Background: Forearm nonunion is a challenging condition for orthopaedic surgeons. Objectives: In this study, we used a new technique for the treatment of forearm nonunion with bone loss and/or current signs of infection. Patients and Methods: Four patients were managed with thorough debridement and a vascularized regional osteocutaneous flap from the distal ulna based on the posterior interosseous artery. Results: Union was achieved after an average of 3.75 months. Skin flap was viable in all patients. The Quick DASH score, VAS score and forearm and elbow range of motion improved compared to preoperative evaluations. Conclusions: A posterior interosseous osteocutaneous flap from the distal ulna is a reliable vascularized bone graft for managing forearm nonunion. https://jost.tums.ac.ir/index.php/jost/article/view/107 https://jost.tums.ac.ir/index.php/jost/article/download/107/107