Just noticed this thread: if you look at my picture you may notice that I have some experience of a similar injury. I have twice sheared of pieces of bone off the very top of my arm next to my shoulder. The first time I continued to run every day, albeit it only a mile or so: result, arm took much longer to heal than it should have done. Second time I did not run, and recovery was much quicker. I also started to do rehab exercises after three weeks whereas the first time it was nine. I would defer!