Shih-Jie Lin1, Kevin Liaw2, Tsan-Wen Huang3,4. 1. Department of Orthopaedic Surgery, Chang Gung Memorial Hospital, No. 6, West Section, Chia-Pu Road, Pu-Tz City, 61363, Chia-Yi Hsien, Taiwan. 2. Department of Diagnostic Radiology, Blount Memorial Hospital, Maryville, TN, 37804, USA. 3. Department of Orthopaedic Surgery, Chang Gung Memorial Hospital, No. 6, West Section, Chia-Pu Road, Pu-Tz City, 61363, Chia-Yi Hsien, Taiwan. b8601081@cgmh.org.tw. 4. College of Medicine, Chang Gung University, Taoyuan City, 33302, Taiwan. b8601081@cgmh.org.tw.