The $20 Knee

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A $20 Knee? You may ask “is it possible”…Oh yes:

Tens of thousands of amputees in the developing world wear an inexpensive prosthetic called the Jaipur Foot. But poor patients who lose a knee joint have few options: a titanium replacement can cost $10,000, and crude models don’t work very well. Now a team of Stanford engineering students has designed a knee that’s not only dirt cheap — just $20 — but also mimics the natural joint’s movements. Read more here.