There are two types of rotator cuff injuries - acute traumatic and repetitive use. “That’s because the collagen that makes up the tendon deteriorates with time, making the tendons more susceptible to injury.” “Rotator cuff injuries are common in all ages, but most common in people over 60,” said Jordan Metzl, M.D., sports medicine physician at the Hospital for Special Surgery. (Related: 5 Expert-Approved Benefits of Using a Rowing Machine) This is especially true with sports and activities that involve repetitive movements or overhead motions such as baseball, swimming, tennis, rowing and weightlifting That means it’s doing a lot all of the time - which makes it more susceptible to injury. “Each muscle pulls the shoulder into different degrees of rotation, or when co-contracting, keeps the shoulder tight in the joint,” he said.īecause the rotator cuff is responsible for stability in the shoulder, it’s used with almost every arm motion and movement. Individually, the muscles of the rotator cuff help rotate the arm inward and outward and contribute to functional movements like reaching overhead or behind your back, Yuen said. “You can remember them by the acronym SITS - subscapularis, infraspinatus, teres minor and supraspinatus.” Yuen said. In fact, there are four muscles that make up the rotator cuff. “The rotator cuff provides this stability through co-contraction, which is when all of the muscles of the rotator cuff contract simultaneously,” Yuen said. This type of mobility, in all planes of motion, requires that the shoulder itself is sufficiently stable. “The glenohumeral joint is a ball and socket joint that allows for mobility in multiple planes of motion.” and physical therapist at Bespoke Treatments. “The rotator cuff is a collection of muscles that attach the humerus to the scapula at the glenohumeral joint,” said Cameron Yuen, P.T., C.S.C.S. The rotator cuff is one of the most important parts of the shoulder, as it’s responsible for holding the shoulder joint in place.
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