collarbone break is a common cycling injury. I broke mine a while back. It will never be the same and I can feel it klunking around sometimes--which probably means arthritis later on. That's just the way it goes. Most of the time it's something they can't operate on or even put in a cast. You just wear a sling and let the sucker heal up.
They heal funny too. Sometimes it's unnoticable, other times there is a lump. It's just the way of the collarbone.