This can be caused, for example, by incorrect functioning of the 'rotator cuff' muscles in the shoulder. This results in impingement more rapidly when the upper arm is elevated.Ī second cause is that the space under the roof of the shoulder becomes smaller because the humerus moves too far up. Cause and originįirstly, the impingement can be caused by certain structures under the roof of the shoulder swelling or taking up extra space. In the case of impingement syndrome, one or more of these structures become trapped because the head of the humerus moves too far upward against the roof of the shoulder. There are muscles, tendons and bursae located between the roof of the shoulder and the head of the humerus. The roof of the shoulder is located above the head of the humerus. ![]() The roof of the shoulder is formed from the shoulder blade and consists of the acromion, the coracoacromial ligament and the coracoid process. The shoulder joint consists of structures such as the shoulder blade and the upper arm bone (the humerus). ![]() ![]() ![]() The literal definition is 'collision', but in the case of impingement syndrome it usually means 'trapping'. The word 'impingement' is a confusing term.
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