What is shoulder impingement and does it really exist?
Here is a video discussing these findings in further detail too: YouTube Video click me References: Couanis, G., W. Breidahl, and S. Burnham. "The relationship between subacromial bursa thickness on ultrasound and shoulder pain in open water endurance swimmers over time." Journal of science and medicine in sport 18.4 (2015): 373-377. Gill, Thomas J., et al. "The relative importance of acromial morphology and age with respect to rotator cuff pathology1." Journal of shoulder and elbow surgery 11.4 (2002): 327-330. Huegel, Julianne, Alexis A. Williams, and Louis J. Soslowsky. "Rotator cuff biology and biomechanics: a review of normal and pathological conditions." Current rheumatology reports 17.1 (2015): 476.