Abstract:ObjectiveTo investigate the impacts of arthroscopic minimally invasive surgery (AMIS) on shoulder joint function and muscle strength in the treatment of rotator cuff injury.MethodsA total of 78 patients with rotator cuff injuries from August 2017 to August 2018 were selected and were randomly divided into observation group and control group (n=39,each).Arthroscopic arthrolysis and rotator cuff repair was performed in observation group,and arthroscopic repair of rotator cuff after manual release was conducted in control group.The surgical conditions,the function and muscle strength of shoulder joint were compared between two groups.ResultsThe operation time［(51.26±9.30) min vs (60.22±10.36) min］,hospital stay ［(7.38±1.68) d vs (12.66±1.24) d］,pain relief time ［(25.28±4.40) h vs (37.38±6.39) h］ and the intraoperative bleeding volume ［(58.32±7.66) ml vs (84.66±9.40) ml］ in observation group were significantly lower than those in control group（P<0.01）.In American Shoulder and Elbow Surgeons (ASES) score and visual analog scale (VAS),there were significant differences in the time effects and the interaction effect of time between two groups (P<0.01).At 3 and 6 months after operation,ASES score in observation group was lower than that in control group(P<0.05).At 6 months after operation,the scores for flexion,[JP2]external rotation and internal rotation increased significantly compared with those before operation in both groups(P<0.01).ConclusionCompared with the arthroscopic repair of rotator cuff after manual release,arthroscopic arthrolysis and rotator cuff repair has the advantages of less trauma and quick recovery,however,its long-term effect is not very satisfactory.