They give you a spinal so they don't completely put you out but enough that you can't see what they're doing,” Densham explained. “They got the same grinders and saws and crap that we do. They cut off the thigh bone and then they take a grinder and radius it and then glue this stainless steel piece on it. And then they cut off the shin bone and sand it flat and drill a hole down the center of it and the other piece, they pound that down in the shin bone and it's a stainless steel spike with a piece of plastic or Teflon on the top of it. They put in the angles to make it all work and then they put a piece in, behind the knee cap and put everything back in place. If you can imagine when they put this big slice in they have got to peel all these ligaments and tendons and everything away to get down to where they're working. They kind of beat you up pretty good.”