The joint wasn't broken as shown by the scan. Look at your own scan. Locate the joint. Look at where the damage is done. Then look and see if the damage is done at the joint of the arm (and it's not since we still see the joint of the arm on Ultron after the damage was done). Then look at the damage that was done to the arm and see if it looks like something that was ripped (lol) out if socket. Simple concept and it isn't hard to do to be honest. I'm not responding to the adamantium netting because it is pointless since anyone with any common sense (and I think you have this) knows that metal doesn't rip or make the rip noise. Even though my boy bran is half crazy, he even acknowledge this.
Tin foil isn't comparable to a freaking adamantium arm.