For those of you who don't know, floor jacks are sometimes used in basements to keep the floors above from sagging. I was just thinking about this as a possible source of the skull fracture, either from being slammed against it on purpose, or accidentally. When I was a kid we had some of these in our basement...they were just a little bigger in diameter than a baseball bat. Has anyone mentioned this before as a possible cause of the fracture? The first photo is a bit deceiving, as the jacks usually extend from floor to ceiling. The second photo shows several of them in a basement.