When your rotator cuff is irritated or injured, it swells in much the same way your ankle does when it is sprained. How does shoulder impingement syndrome develop? Rotator cuff is a group of muscles that sits in the small space between the acromion and the humerus. This arrangement makes the rotator cuff susceptible to being pinched or “impinged” between these bones, leading to what is called “impingement syndrome.” You will notice in the illustration that the rotator cuff sits in a small space between two bones in the shoulder (the acromion and the humerus). You use your rotator cuff to help raise your arm overhead and to rotate your arm towards and away from your body. What is my rotator cuff and what does it do?Īs seen in the illustration, your rotator cuff is a group of four muscles that originates on the shoulder blade and attaches as a “cuff’ of tendon onto your arm bone (humerus).
Shoulder impingement occurs when the top outer edge of your shoulder blade, called the acromion, rubs against (“impinges on”) or pinches your rotator cuff beneath it, causing pain and irritation. Bone spurs tighten the space around your rotator cuff causing it to rub against the acromion. One cause of shoulder impingement syndrome is bone spurs.
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