Bony Abnormalities: Bone spurs or variants in The form from the acromion can result in enhanced friction and impingement. A A part of the scapula, generally known as the acromion, forms a roof around the humeral head and rotator cuff (see photo of bony anatomy with the shoulder). Rotator Cuff https://www.theorthopaedicandpainpractice.com/is-my-shoulder-pain-caused-by-a-rotator-cuff-tear/