this is a major operation doctor it along must avoid cutting into vital organs and blood vessels. that's come to us through the first step is to examine the prosthesis and you can see it there on the screen it's one should this impromptu i think you should think it's in pretty bad shape to support all of this in. some plastic pieces have become lodged behind his spine. is what i'm pulling out these little bits of white stuff. so it's like pulling out old pieces of chewing gum you see. the surgeons place a new artificial disk in bus goes back the device is outfitted with to tinian plates it's clear that the old prosthesis has severely damaged the vertebrae. it is