The rotator cuff is the group of muscles and tendons in the shoulder that connects the arm bone to the rotator socket in the shoulder blade bone. This group of muscles helps keep the arm bone in place and securely in the socket so it can move freely.
When there is an injury, sprain, strain, or tear in the muscles or tendons, or inflammation, moving the arm can be painful and unpleasant. Some of the more common causes of rotate cuff tendinopathy include: