Affiliation: | 1. Department of Orthopaedic Surgery, Chung-Ang University Hospital, School of Medicine, 224-1 Heukseok-dong, Dongjak-gu, Seoul 156-755, South Korea;2. Department of Orthopaedic Surgery, Hallym University Sacred Heart Hospital, Medical College of Hallym University, 22, Gwanpyeong-ro 170 beon-gil, Dongan-gu, Anyang-si, Gyeonggi-do 431-796, South Korea |