The concussion, I believe it will take a while for the scar tissue to develop, and show up on an mri. I had a severe concussion, about a year later a grand mal seizure. Easily taken care of by meds. How long you have to take them depends on the severity of the injury. Some never cause seizures. The shoulder, What they call a non union really sucks. That is what it sounds like, it moves more than it is supposed to and is weaker. I do not believe it could ever be 100 percent. If that scrambled mess knits together it will be fine, hideous but stronger than your other. You could have demanded surgery. Unless its poking through the skin, it ain't nothing to them! Your remembrance seemed better than mine was, and my collarbone blew into 5 pieces. Good luck!