Jung Ho Noh1, Sang Jun Song2, Ji Yoon Bae3, Young Hak Roh4, Woo Kim3, Bo Gyu Yang3. 1. Department of Orthopaedic Surgery, Kangwon National University Hospital, Chuncheon-si, Gangwon-do 200-722, South Korea. E-mail address: bestknee@hotmail.com. 2. Department of Orthopaedic Surgery, Kyunghee University Medical Center, 23 Kyungheedae-ro, Dongdaemoon-gu, Seoul 138-708, South Korea. 3. Department of Pathology (J.Y.B.) and Orthopaedic Surgery (W.K. and B.G.Y), National Police Hospital, 58 Garakbon-dong, Songpa-gu, Seoul 138-708, South Korea. 4. Department of Orthopaedic Surgery, Gil Medical Center, Gachon University School of Medicine, 1198 Kuwol-dong, Namdong-gu, Incheon 405-760, South Korea.