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1. Yes, the knee joint is cut out with power saws. The bone at the distal end of the femur (with what's left the cartilage), and the bone on the proximal part of the tibia (with remaining cartilage) vets cut away. Then, using special jigs, you're drilled, sized, trial fitted, and then implanted with a metal and plastic knee prosthetic joint. If you're on this DIY board, you'd probably find it pretty fascinating, if it wasn't your own body part going through it all.
2. Stairs will be tough at first, but I'd imagine you could scootch yourself up and down at first, if needed. Like others have written, your recovery in large part depends on what you put into it. Eventually, stairs should not be a problem at all. But if you wanted to do things like skiing or surfing, you may have to give those activities up.
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1987 Venetian Blue (looks like grey) 930 Coupe
1990 Black 964 C2 Targa
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