The rotator cuff is composed of four muscles (supraspinatus, infraspinatus, teres minor, and subscapularis), as well as tendons and ligaments that are surrounded by bone at the top of the shoulder. Tendons support shoulder movement by forming a cuff around the humerus that stabilizes it and holds it in place. They also connect the upper arm to the shoulder blade. The muscles, tendons, and ligaments in the shoulder joint work hard to support and move the arm.
Common actions that can be attributed to tears and fraying in the tendons and muscles of the rotator cuff include: repetitive motions such as those used by painters, carpenters, weightlifters and other athletes; poor posture; aging; falling on the arm and causing damage to the shoulder joint; strains to muscles and tendons from lifting heavy objects.
Massage therapy is good for rotator cuff injuries because it helps to decrease inflammation and pain in the area, releases scar tissue, loosens tight and tense muscles, and increases range of motion in the shoulder girdle.