The rotator cuff is an entire grouping of tissues in the shoulder joint that includes muscles and tendons. The rotator cuff is supposed to keep the upper arm securely in the shoulder joint. The most common injury to your rotator cuff is a tear.
Disclaimer: The information above should not be used as a substitute for professional medical advice, diagnosis or treatment. You should seek the advice and care from a primary care physician or physical therapist. If you are experiencing a medical emergency, call 9-1-1.