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Shoulder pain is the third most common musculoskeletal complaint seen by doctors, affecting approximately 18-31% of the global population each month. Up to 85% of these cases are due to problems with the rotator cuff (RC)-the shoulder's built-in support system. Made up of four muscles and their tendons, the RC keeps the upper arm bone securely in the socket while allowing the arm to lift, rotate, and move smoothly.
Source: Medical Xpress
