Institution: | a Department of Orthopaedic Surgery, Hoshigaoka Koseinenkin Hospital, 4-8-1 Hoshigaoka, Hirakata, Osaka 573-8511, Japan b Department of Orthopaedic Surgery, Osaka University Medical School, 5-2 Yamadaoka, Suita, Osaka 565-0871, Japan c Department of Orthopaedic Surgery, Sekime Hospital, 2-13-13 Sekime, Jyotoku, Osaka 536-0008, Japan |