“…There are some reports on tear progression, but these are retrospective studies, or the number of participants is small. 7,18,20,21,30 Smoking, 3,11 hypercholesterolemia, 1 and age 6,19,27,31 are known to be risk factors for rotator cuff tears, whereas few reports have assessed the risk factors for tear progression. 9 It is important for surgeons to know the risk factors for tear progression, especially when nonoperative treatment is chosen, because the clinical outcomes of the repair of large to massive tears have been pointed out to be less satisfactory than those of small to medium-sized tears.…”