The rotator cuff is a bunch of 4 muscles which really helps to stabilise and shift the shoulder joint. Rotator cuff injuries can vary from shoulder impingement/ tendinitis to partial or finish tears. The rotator cuff tendons and muscles stabilize your shoulder and allow a complete choice of movement and https://www.theorthopaedicandpainpractice.com/is-my-shoulder-pain-caused-by-a-rotator-cuff-tear/