My 6 month old daughter broke my sternum in two places and dislocated it as well by head butting me over a period of about a week. It took doctors a year and a half to realize that it was in fact broken in two places and dislocated... not muscular. They now believe that it is broken again only in a different place, we are just awaiting the CT Scan results. I am in so much pain and can't figure out how it broke again. What is causing my sternum to break so easily?