Supraspinatus tendon tears usually take about 3 months to recover. The clinical manifestations of supraspinatus tears are sharp pain in the shoulder followed by relief, and thereafter gradual aggravation, with the shoulder unable to do active activities. Examination reveals widespread pressure pain in the shoulder, sharp pain at the rupture, and often palpable rupture or abnormal friction sounds. The pain gradually decreased 7-10 days after the injury, and the upper arm could be abducted to 90 degrees, but there was no force. If the rupture gap is large and there is a partial rupture of other tendons, the shoulder cannot be actively abducted to 90 degrees. Iodine oil imaging of the shoulder joint can show that the joint cavity and the subdeltoid bursa are connected. The symptoms of partial rupture are similar to those of rotator cuff injury, but the painful point is still weak after closure. According to the degree of rupture, it can be divided into partial rupture and complete rupture, and according to the tissue part of the rupture, it can be divided into three kinds of tears: tendon fiber tear, bursal layer tear of tendon, and joint layer tear. Treatment is mainly surgical, i.e. arthroscopic suturing of the supraspinatus tendon.