One of the chest muscles, pectoralis minor, is attached to the scapula on the front of the shoulder, at the coracoid process under the lateral clavicle. If it stays in a shortened position or if it is overused then it will pull the scapula forward. From this pull, the shoulder and the humerus will be internally rotated. The rhomboids and the trapezius will react by laying down adhesions to try to keep the shoulder and the arm from drawing forward into this internal rotation. Which is why most people have knots all along their shoulder blades. The supraspinatus, which is the main culprit in 90% of all rotator cuff injuries, relies on the humerus for an attachment site for its tendon. The tendon comes off the shoulder in a relatively straight angle (somewhat like drawing a line through your body from shoulder to shoulder). If the humerus is rotated then the supraspinatus tendon will be under increased pressure and it can be irritated by the acromion process as the tendon passes underneath at an angle. Most of the time treatment is directed towards the painful area of the shoulder, but the main contributing factor may be the pectoralis minor. Which is why some treatment of rotator cuff injuries are either unsuccessful or why symptom relief may be short-lived. As the use of computers increases, we see this condition increasing in great numbers because typing and using the computer mouse keep this muscle in a shortened position. So remember to take breaks when needed and make sure to incorporate a stretching routine, like yoga at our Spokane Valley location, to your everyday activities.
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