When the scapula isn’t synchronizing with arm movements, the subacromial space is compromised. This is crucial, because of the most commonly injured rotator cuff muscle/ tendon living in this space. The supraspinatus tendon is almost always involved in chronic rotator cuff pain and weakness. The subacromial space sits under the roof of the acromion process. The acromion is also part of the scapula. Imagine moving your arm up and down for years without the scapula also moving in concert with it.
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