I'm going to say "none" with a couple of qualifications: 1) I've smacked the living daylights out of my little toe a time or two over the years. It may have been broken, but there's no real treatment or anything for that, you just deal with it. 2)
I may have fractured an ankle making a real suave departure from an airport shuttle at Newark one time. Again, no real treatment for it, but it caused me problems for a long time.