Abstract: Abstract — Surgical Treatment of Neglected Adult Monteggia Fracture - 2 Cases Report - Hyun-Chul Shon, M.D. � , Weon-Yoo Kim, M.D., Sang-Eun Park, M.D., Young-Yul Kim, M.D., Jong-Seoung Yoon, M.D., Jong-Hun Ji, M.D.* Department of Orthopedic Surgery, Chungbuk National University College of Medicine � ,Daejon St. Mary ’ s Hospital, The Catholic University of Korea College of Medicine, Korea Neglected adult Monteggia fracture could induce the pain, instability and malformation of elbow. Especially, com-pared with the chronic Monteggia fracture of child, that of adult is difficult to treat and could concur with valgusinstability and deformity, limitation of range of motion and tardy ulnar nerve palsy. But recently, the chronic Mon-teggia fracture of adult could be treated by the 3.5 mm compression plate (DCP) or 3.5 mm pelvic reconstructionplate, so that the result improved more and more. The treatment of choice of the chronic Monteggia fracture of adultis the corrective osteotomy and reduction of radial head or resection of radial head. We experienced two patients whohad neglected Monteggia fracture over 1 year 6 months and 25 years respectively and we want to report the result ofsurgical treatment of chronic Monteggia fracture of adult.