There used to be a show on Discovery or TLC which took you through various operations. I could not manage to watch many of them, but I did see a knee replacement. Norm Abrams would have been right at home. Stainless steel jigs to locate the cut and provide a proper bedding angle for the new knee parts. Used a stainless drill and saw that could have been made by B&D. A SS mallet to drive them in after a SS measuring jig helped them determine what size and length the new parts needed to be. In some respects it was like viewing a woodworking tutorial with a new tool. The patient was a rather large individual and the tech that was responsible for moving, holdiing and position the leg was a trooper. Pretty amazing to watch.