@thor I think the opposite, bones are pretty tough and hard on the outside, I'd expect any knife to slip. (Unless it's more like an axe and has enough inertia to not get deflected and enough toughness to not snap or bend.) I recall stories of trauma where the bone was what stopped whatever foreign object, stories where an edge went into the bone not so much.
@Amikke i suspect any of us geeks would - in the absence of people who have been trained on this - would be able to help out at least a little. i don't know proper techniques for how to treat a patient with a serious wound but being a geek, i'd at least know a bit about how to avoid bacterial contamination, germ theory of disease, blood pressure, oxygen levels, some basic chemistry to maybe let me disinfect a wound with alcohol (painfully but potentially life-saving), etc.