What an interesting question, since we had chops for dinner last night !! I usually hold the bone in one hand and pick off the meat with my other hand. My husband sometimes has ribs, if they are on the menu, and he eats them with two hands. It is a messy meal, so it is expected to be a two handed meal. I never consider etiquette when eating bones. You are just supposed to get in there and be an animal
I would have to admit to using both hands, just because it is so much easier for me!!! Eating the meat from the bones when I was little was always the fun time when we were allowed to be a bit messy, so I cannot imagine trying to keep one hand totally clean!!! Takes all the fun and half the enjoyment out of it!!!! !
one hand is the accepted method.. my father who lived to 90 would never eat this way. always used his knife and fork. we would point out the meat he was leaving on the bones , did not make any difference (well the dogs did alright afterwards) rest of the family would happily chop on the bones, with one hand.