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Garth Stewart, a retired Army specialist, lost his left foot and
part of his leg four years ago while serving in Iraq. This summer,
24-year-old Stewart tested the PowerFoot, a new powered ankle-foot
prosthesis developed by researchers at the Massachusetts Institute
of Technology (MIT), Cambridge. The prototype device uses the
latest advances in lower- limb prosthetics, including tendon-like
springs, microprocessors, and a power source, to replicate natural
motion. Stewart says the best thing about the device is that it
improves his posture while walking and lets him walk faster than
his current high-tech prosthesis allows.
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