Rhee SM, Youn SM, Park JH, et al. - This study was sought to correlate clinical and radiographic results of arthroscopic rotator cuff repair (ARCR) with biceps re-routing (BR) and those of conventional repair for semi-rigid, large-to-massive rotator cuff tear (SRCT). Between January 2016 and December 2018, data were prospectively obtained from 111 patients who had undergone either ARCR+BR (n=59, Group-1) or only ARCR (n=52, Group-2) for SRCT. They performed univariate logistic regression analysis to distinguish predictive variables for occurrence of retear after ARCR+BR. For semi-rigid, large-to-massive rotator cuff tears, ARCR+BR effectively improved clinical and structural outcomes as also shown in the conventional repairs. It was shown that the retear rate was significantly lower in patients who had undergone ARCR+BR, than those treated conventionally. For the postoperative occurrence of retear, partial tearing involving > 50% of the long head of biceps tendon and wide and/or thin tendon morphology were significant risk factors.