Shoulder Impingement Syndrome

Understanding Shoulder Impingement Syndrome

Also known as: Subacromial Impingement, Swimmer's Shoulder, Thrower's Shoulder Most people with shoulder impingement describe the same frustrating arc: lifting the arm feels fine at first, then catches somewhere between 60 and 120 degrees, and then feels fine again above that range. That "painful arc" is the calling card of impingement — the tendons and bursa (a fluid-filled cushioning sac) beneath the top of the shoulder blade getting pinched between the ball of the humerus and the overlying acromion as the arm lifts. What drives that pinching, usually, is not a structural problem with the shoulder itself but a functional one: poor shoulder blade mechanics, muscle imbalance, or postural changes that narrow the subacromial space. Address those drivers, and the shoulder typically recovers well without surgery.

You may struggle to reach a seatbelt, tuck in a shirt, or sleep on that side at night. Overhead reaching, throwing, and washing your hair worsen it. Some patients notice aching that radiates down the outside of the upper arm. Overhead workers — painters, electricians, stockers — and athletes in swimming, tennis, and throwing sports are most affected, as are patients with rounded-shoulder posture from desk work.

Our approach targets the entire shoulder complex. We use glenohumeral, AC, and SC joint mobilization, thoracic spine adjustments to restore upright posture, and targeted soft-tissue work on tight pectorals and upper traps. We then rebuild the foundation with scapular stabilization drills — serratus anterior and lower trapezius work — and rotator cuff strengthening. Class IV laser calms tendon inflammation.

Most patients see meaningful improvement within four to eight weeks. If pain persists or weakness is significant, we coordinate imaging and orthopedic consultation to rule out a structural tear. We may recommend: extremity adjustments, diversified adjustments, mobilization, Graston/IASTM, ART, Class IV laser, corrective exercise, ergonomic coaching Seek immediate care if: You experience sudden severe shoulder weakness after trauma, cannot lift your arm at all, or have numbness and tingling radiating into the hand.