Alastor Moody
I don’t know why I never questioned this before but I suddenly had this thought.
We learn in book/move 2 that bones can grow back with Skele-Gro so why does Moody have a wooden leg?.
If you can regrow bones in the wizarding world, surely they can grow new skin, muscles, etc., etc., with the Skele-Gro, thus wizards don’t need to be amputees.
ETA: sorry everyone who's commented so far after I read them I remembed all those points….. This is what happened when you can’t sleep, are very tired and have a sudden thought.