Scapular Protraction and Retraction

The resting position of the shoulder blade (scapula) is generally ~2 inches away from the spine, between 2nd and 7th rib. Protraction and retraction of the shoulder blade can be described simply as moving away and toward from the center of the body, however, ligaments and muscles surrounding the collar bone (clavicle) and rib cage (thorax) cause moderate tilts and rotations. As the shoulder blade glides along the rib cage, the joint where the sternum and collar bone meet (SC) protracts/retracts and the joint where the shoulder blade and collar bone meet (AC) rotates. Proper interaction of these joints decreases the chance of impingement and/or rotator cuff compression from shoulder blade alteration (scapular dyskinesis).

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