I have rotator cuff impingement in both shoulder's. When I raise either arm above my head they don't want to come back down without popping and snapping, sometimes with me seeing star's! When my right shoulder locked up my son told me I needed to get it fixed before our Canada fishing trip. Ended up at the Dr. and went through physical therapy, no longer locked up but the popping and snapping is still there. At this point it is just something I have to deal with.