About a month and two weeks ago I woke up to go to the gym and had an intense pain in my shoulder when I tried to hang on a bar. No specific event caused it. I got an MRI and they found a piece of bone/cartilage in my GH joint. They gave me a cortisone shot and this is where my question comes in. The cortisone shot did nothing, I still feel the same feeling when trying to overhead squat. Would is be possible for a loose body to cause me this many problems even after a cortisone shot? I'm a pretty avid crossfitter and it is very annoying because I can't snatch, do kipping pull ups or any wide grip overhead movement.