Mariano Rivera And The Importance Of The AC Joint

Person in a blue athletic outfit and black shorts, standing with one hand on hip and the other resting on a wall, shown from the neck down.
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 Shoulder problems in pitchers are usually related to the rotator cuff muscles or the labrum. These are soft tissue structures that help stabilize the shoulder during the throwing motion. Luckily for Mariano Rivera, the shoulder pain that he had during last season was related to his acromioclavicular joint (or AC joint).

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