1. Department of Medical Engineering for Treatment of Bone and Joint Disorders; Osaka University; Suita Osaka 565-0854 Japan
2. Ceramic Physics Laboratory; Kyoto Institute of Technology; Sakyo-ku Matsugasaki Kyoto 606-8585 Japan
3. PMK Hip & Knee Surgery; Department of Orthopedics; Phramongkutklao Hospital and College of Medicine; Bangkok 10330 Thailand