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A knee replacement is really a cartilage replacement. The knee
itself is not replaced, only the cartilage on the ends of the
bones. The replacement implants include a metal alloy on the bottom
of the thighbone and polyethylene (plastic) on the top of the tibia
and underneath the kneecap. The implant is designed to create a
new, smoothly functioning joint that prevents painful bone-on-bone
contact.

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