Impingements are a bitch. A “wrong” move can reverse them...but which wrong move is it? Good luck.
They said some of the impingement is “idiopathic” which is a fancy word for “we don’t know” what’s causing it. They said some of it may be congenital, or there may be bone spurs in the nerve canal. they won’t know until they get in there. It’s a hard area to image properly.
CC