The time period “impingement syndrome” was applied mainly because it was recognised that many problems with the rotator cuff couldn't be reliably differentiated on Actual physical evaluation. In the following paragraphs, I will not be discussing rotator cuff tears because that is a big matter and can be mentioned separately. https://www.theorthopaedicandpainpractice.com/is-my-shoulder-pain-caused-by-a-rotator-cuff-tear/