The supraspinatus muscle is the most active of the four rotator cuff muscles. It is responsible for abduction of the your arm at the shoulder. Most importantly, in conjunction with the other rotator cuff muscles, it is responsible for dynamic stabilization of the shoulder joint.

The shoulder has less connective tissue structure than other major joints. The rotator cuff muscles act as a sort of dynamic muscle/ligament hybrid to stabilize the shoulder joint as you move.

Of the important functions of supraspinatus is to provide resistance against the downward migration of your humerus during the arm swing of normal gait.

Trigger points in your supraspinatus cause pain on the side of the shoulder, and sometimes extending down the side of your arm to the elbow and forearm.

Supraspinatus trigger points are often involved with shoulder impingement syndromes. It is also the most frequently torn rotator cuff muscle.