Abstract: Objective To investigate the value of knotless double-row suture bridge fixation for rotator cuff tear under arthroscope. 
Methods A total of 80 patients with rotator cuff tears (all patients with medium and large tears) were selected and divided into two groups according to random number table method, with 40 patients in each group. The control group was treated with traditional arthroscopic suture bridge technique, and the observation group was treated with arthroscopic knotless double-row suture bridge fixation. Pain and shoulder joint function scores and rotator cuff retear probability were analyzed at 1 d before surgery and at 2 weeks after surgery. 
Results There was no significant difference in visual analogue scale (VAS) score and the university of California at Los Angeles shoulder rating scale (UCLA) score between two groups at 1 d before surgery (P＞0.05). At 2 weeks after surgery, the VAS score of the two groups was lower than that at 1 d before surgery, while the UCLA score was higher than that at 1 d before surgery. The VAS score of the observation group was lower than that of the control group, while the UCLA score was higher than that of the control group (P＜0.05). There was no significant difference in shoulder joint mobility between two groups at 1 d before surgery (P＞0.05). At 2 weeks after surgery, the shoulder joint mobility of the two groups was better than that at 1 d before surgery, which was better in the observation group than in the control group (P＜0.05). The average recovery time and weight bearing time of the affected hand in the observation group were shorter than those in the control group (P＜0.05). Compared with the control group, the observation group had a lower incidence of rotator cuff retearing and joint stiffness (P＜0.05). 
Conclusion The rotator cuff tear can be repaired with arthroscopic knotless double-row suture bridge fixation, which can significantly improve the shoulder joint function, increase the range of motion, and avoid the occurrence of retear. It has the advantages of simple operation, and has a wider range of adaptation in clinical treatment. 

Key words: rotator cuff injuries, arthroscopy, knowless double-row suture bridge fixation