Originally posted by kenposcum
Well, one of my colleagues is a doctor, and he said that everytime you punch something, little itty bitty hairline fractures appear in the bone of the knuckle. After time, calcium forms over these fractures (reinforcing the conditioned area) and giving the practioner those knobby karate knuckles. For example, look at pictures of Bruce Lee's or Mas Oyama's knuckles. Were they big and nasty-looking? Did both of those men condition their fists? Aye!
Furthermore, bone is stronger than pretty much any rock, pound for pound. The fibrous insides of the bone provide phenomenal structural support...when a bone is broken, it tends to be a result of leverage working against the bone as opposed to structural failure of the bone itself.
And when said bone does heal, there's a calcium lump over where the bone broke, making the bone stronger.
Read any Anatomy and Physiology textbook, it'll tell you pretty much the same stuff, only in more high falutin language. Now, is that enough medical proof for you?:asian: