Let them heal

I'm not saying she's necessarily wrong but that whole concept makes alot assumptions. There are many reasons, of which there is no way I'd be able to list them all, that this wouldn't really hold true. The first is that breaking femur is not easy. In fact most humans will live their entire lives without breaking it. It is entirely in the scope of reason to have a civilization go for decades or centuries without someone falling into this category. Second, if you do break a femur it was probably a pretty nasty injury. It's extremely likely that that wasn't the only injury and complications can occur quite easily. If the person died from an infection or as a result of other injuries then of course their femur wouldn't be healed. That doesn't mean someone wasn't there trying to take care of them. I'm sure there are lots more scenarios. While I get the intent of what she said as a professor I'd think she take a little more care in what she says.

Tell that to Big Al the Allosaurus.