Just a quick background, 38/M. Ran the Chicago Marathon in 2006. Had a pacemaker implanted this past April because of 3rd degree Heartblock, heart stopped for 83 seconds. I have gone to a chiropractor for pain in my shoulders the past 2-3 years. Pain got so bad this past weekend that I went to the ER. Xray showed a clay shovelers fracture @T1, doc said it was not recent injury. How could this have happened? I have read what was on the net and about it and nothing sounds like a description of how it could have happened. At my work I operate an overhead crane for a majority of my 12 hour shift, could it be a repetitive motion injury?