I once read about the most bones broken on an accident. I don't remember very well, I think the guy fell off from a huge height, either that or he had some kind of car accident. Either way, he broke ALMOST ALL of his bones. Just so you know, the human body has 206.
Hmm, all of this is something I barely recall reading a long time ago, so I don't remember much. Out of curiosity, I just researched a bit. The guy's name is Evel Knievel, a motorcycle daredevil. He broke almost all of his bones, but that was during his lifetime, not on a single accident (actually, during his lifetime he suffered 433 broken bones. Ouch..). He died a few years ago, aged 69, out of a pulmonary disease, so I guess he did recover of his injuries and had a peaceful life on his latter years