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The shoulder is the most mobile joint in the human body. The joint includes four tendons. The purpose of a tendon is to hold muscle to bone. Together, these four "rotator cuff" tendons stabilize the upper arm bone to the shoulder socket and allow a wide range of motion in the shoulder.
Any swelling, inflammation, tearing, or bony changes around these tendons causes pain when a person tries to move the arm above the head, behind the back, or straight out in front.
The tendons pass underneath a rigid bony arch in the shoulder. The most common cause of shoulder pain is when the tendons become trapped under this arch. The compressed tendons become inflamed or damaged, a condition called rotator cuff tendinitis . This can occur from general wear and tear as you get older, an activity that requires constant shoulder use like baseball pitching, or an injury.
Shoulder pain can also be due to:
Braman JP, Tehrany AM, Flatow EL. Rotator cuff repair. Am J Orthop . 2005; 34(6): 267-270.
Paternostro-Sluga T, Zoch C. Conservative treatment and rehabilitation of shoulder problems. Radiologe . 2004; 44(6): 597-603.
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