somewhat like WH was onto, i wonder how, or if, hooves would affect the spine.
i'd imagine that off-hand, while people may adapt to an a circumstance, hooves aren't on our evolutionary list any time soon simply as a balance issue. how often do you use your feet to balance? a lot, more than you'd think, probably. of the options mentioned, i'd vote for the three-toed one, like a camel?, as being the best 'viable' option, but even then, because of our top-heaviness, our feet would probably be pretty damn big unless there was a complimentary evolution in human balance to compensate. balance, in fact, i think is the major hurdle in creating robots that walk like humans.
but, sure, if they had them from birth, you learn to use what you've got or you do without, eh? and while you can learn to use two prosthetic legs, you'd still not want to race me in the 100 yard dash, heh heh.
oh, and women would probably suffer the most with hooves, especially those who are top heavy, and they often already have lower back pain *with* normal feet.
i don't know about women's feet and old china, but the japanese used to (and while this practice has died out over the years, it was still done in a small extent within living memory) wrap women's feet to an inhuman degree. the idea was to make the feet very, very small, delicate, and 'womanly.' it worked -- their feet were almost function-less. the photos i've seen of these poor women's feet are indescribable. i say 'poor,' but that's wrong -- women with these feet weren't very useful, obviously, rather a privileged woman's thing.
oh, the torture we've put women through.