1. Department of Orthopaedic Surgery, Tohoku Rosai Hospital, Sendai, Japan;
2. Department of Orthopaedic Surgery, Tohoku University Hospital, Sendai, Japan;
3. Department of Diagnostic Radiology, Tohoku University Hospital, Sendai, Japan;
4. Department of Pathology, Tohoku University Hospital, Sendai, Japan;
5. Department of Orthopaedic Surgery, Tohoku Kosai Hospital, Sendai, Japan