Shoulder Impingement

Non-physiological and painful contact between the humerus (arm bone) and the acromion (highest and most lateral part of the scapula or shoulder blade) that restricts abduction and flexion of the arm. It is generally due to extra bone formation on the lower surface of the acromion which intersects the humerus at 140 -150 degrees, instead of allowing it to abduct and flex closer to 170 – 180 degrees.