The shoulder joint is surrounded by group of muscles and ligaments that compose the rotator cuff which support and anchor the upper arm bone in the empty shoulder socket. Rotator cuff injuries are caused by car accidents or falls or certain sports that overuse the shoulder like baseball or tennis. Symptoms can range from simple discomfort, to significant pain and reduction in range of motion to arm weakness. Diagnosis is made via physical examination to history taking to MRI. Treatment can range from anti-inflammatory medication and corticosteriod injections to physical therapy to open/arthroscopic repair.