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The Proprio Foot comes closer to mimicking real foot action than any other prosthetic because it flexes at the ankle, using artificial intelligence and a muscle-mimicking motor. Sensors in the ankle sample movement more than 1,000 times a second to determine walking speed and transmit the data to the onboard computer. That signals a piston to move the foot to match the other foot’s pace. $15,000–$18,000; bionics.ossur.com
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