Tissue regeneration for the traumatic anterior instability with bony defect

10 LONGITUDINAL STUDY FOR ROTATOR CUFF TEARS IN THE GENERAL POPULATION Atsushi Yamamoto, Kenji Takagishi, Hitoshi Shitara, Tsuyoshi Ichinose, Tsuyoshi Sasaki, Noritaka Hamano, Tsutomu Kobayashi, Daisuke Shimoyama, Toshihisa Osawa, Department of Orthopaedic Surgery, Gunma University Graduate School of Medicine, Department of Physical Therapy, Takasaki University of Health and Welfare, Department of Orthopaedic Surgery, Takasaki General Medical Center The purpose of this study was to elucidate the natural history of rotator cuff tears (RCTs) in the general population. We have performed annual medical check-ups since 2006. The subjects of this study consisted of 568 people, with 1,136 shoulders, who were investigated longitudinally more than two times between 2009 and 2015, which comprised 400 men and 736 women, with a mean age of 67.2 years (range; 30-85), and a mean follow-up period of 3.5 years (range; 1-6). We performed ultrasonography to diagnose RCTs. At the beginning of the survey, 957 shoulders were diagnosed as non-tear. As time passed, 45 and 29 of these shoulders progressed to partial-thickness tear (PTT) and full-thickness tear (FTT), respectively. At the same time, 32 shoulders were diagnosed as PTT, and 53.1% of them progressed to FTTas time passed. Additionally, 147 shoulders were diagnosed as FTTat the beginning of the survey, and 33.3% of them enlarged the size of tears by more than 5 mm during the survey. In 147 of FTTs, 43 shoulders were symptomatic tears and 104 shoulders were asymptomatic tears. The development of symptoms in both symptomatic and asymptomatic tears was associated with the enlargement of the size of tear. In conclusion, RCTs might become asymptomatic if the size of tear the remains the same, while they seem to be symptomatic when a new tear or enlargement of the size of the existing tear occurs.