The opposing muscle of shoulder abduction is the rotator cuff muscle group. The rotator cuff muscle group mainly consists of the supraspinatus, infraspinatus, teres minor and subscapularis, and the resistance to shoulder abduction is the joint action of the deltoid and supraspinatus. Usually, the shoulder joint abduction at the same time, easy to lead to rotator cuff injury. After rotator cuff injury, rotator cuff tear or rotator cuff rupture can be observed by magnetic resonance examination, which is manifested as soreness, swelling and hidden pain in the shoulder joint, affecting the rest. Usually, symptomatic treatment is given, oral non-steroidal painkillers, or localized closed treatment, baking electricity, heat, acupuncture, massage, and surgical intervention with shoulder arthroscopy is needed to solve the problem.