Dr. Hirotaka Sano has been involved in both the clinical practice and the basic research of the shoulder surgery. He spent two years in the Bone and Joint Research Laboratory of Ottawa University (Canada) as a research fellow from 1995 to 1997. During that period, he published 5 research articles in the top journal of Orthopaedic field, including Journal of Bone and Joint Surgery (British volume), Journal of Orthopaedic Research and Journal of Shoulder and Elbow Surgery. After his return to Japan, he finished his thesis with the topic of pathogenesis of rotator cuff tendon tearing. He continued his researches concerning pathology and healing process of rotator cuff tearing. At the same time, he has been also working in the field of biomechanics, particularly with the finite element analysis. Using this method, he is trying to clarify the pathomechanism of tendon tearing as well as fracture around the shoulder joint. He published numerous papers in the international journal and received many awards in the international meetings including the Outstanding Paper Award in the 2003 Northern Region congress of Asia Pacific Orthopaedic Association (Taipei), Richard B. Caspari Award in the ISAKOS 2011 Congress (Brazil), and the Best Paper Award Congress of Arthroscopy and Sports Medicine (India).