206 Copyright c 2014 The Korean Fracture Society. All rights reserved. This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/ by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. Received November 25, 2013 Revised May 12, 2014 Accepted May 12, 2014 Address reprint requests to: Kook Jin Chung, M.D. Department of Orthopaedic Surgery, Hallym University Kangnam Sacred Heart Hospital, Hallym University College of Medicine, 1 Singil-ro, Yeongdeungpo-gu, Seoul 150-950, Korea Tel: 82-2-829-5435ᆞFax: 82-2-834-1728 E-mail: chungkjmd@dreamwiz.com