Rotator cuff injuries are one of the most common causes of shoulder pain and can significantly affect your ability to lift, reach, sleep, and carry out day-to-day activities. The rotator cuff is made up of four muscles and their tendons, which work together to stabilise and move the shoulder joint. Injuries can vary greatly in severity, ranging from mild inflammation to complete tendon ruptures. What Are the Different Types of Rotator Cuff Injuries? Rotator Cuff Tendinopathy