The Rotator Cuff is a group of muscles and tendons that surround your shoulder joint. Their function is to keep the head of your arm bone within your shoulder. They are also responsible for arm lifting and moving.
A common condition that affects the rotator cuff is called Rotator Cuff Tendinopathy. It is also known as tendinosis or tendinitis. It is usually presented with shoulder pain, and it can lead to shoulder stiffness if left untreated.