The rotator cuff consists of 4 muscles:
The most commonly injured muscle in the rotator cuff is the supraspinatus, because it can rub against the under-surface of the acromioclavicular joint. As it rubs, the tendon can sometimes fray, causing pain and swelling of the tendon. Traumatic injuries can sometimes cause partial, or even complete tearing, which may need surgery to fix. ESWT is very effective in reducing the pain, damage, and inflammation from injuries to the rotator cuff.