Most patients with rotator cuff injuries are in special occupations or jobs, such as porters, throwers or baseball players, and so on, who suffer from chronic and repetitive acute torsion of the rotator cuff, resulting in excessive friction on the rotator cuff. In early rotator cuff injuries, the pain is limited to the top of the shoulder, but can radiate to the deltoid as the injury increases. If the rotator cuff is ruptured, the patient will feel a sudden ringing or tearing sound in the shoulder, abnormal localized movement of the shoulder when moving the shoulder, significant swelling and subcutaneous bruising. As a result of the pain, there is a limitation of shoulder movement, usually for lateral planks, or severe pain in lateral planks, and over time, the injury worsens and pain can occur in lateral planks between 60-120 degrees, beyond which the pain stops immediately.