The Truth about Shoulder Impingement
Shoulder Impingement accounts for 65% of shoulder pain and functional limitations and is often not treated early enough. To fully understand shoulder impingement its necessary to understand the anatomy of the shoulder.
The shoulder is a ball and socket joint built for mobility. The shoulder joint is composed of 3 bones: the humerus, the scapula and the clavicle. Shoulder Impingement is the pinching or compression of rotator cuff muscle tendons, ligaments or bursa under the acromion. The acromion is the top hook of the scapula that meets the clavicle at the outer point on top of the shoulder. The rotator cuff is composed of 4 muscles: the supraspinatus, the infraspinatus, teres minor and subscapularis. The supraspinatus tendon passes under the acromion and the bursa provides cushion and lubrication to the tendon. The tendon becomes painful due to microtrauma from compression.