Most prosthetists agree that prosthetic devices should be as lightweight as possible while including the safest, most efficient, and most functional componentry possible. Contemporary ankle-foot components can adjust to changes in slope, making walking on ramps or other uneven surfaces easier and allowing a wider range of shoe heel heights to be worn. These components may contain hydraulic units, microprocessors, and force-generating actuators and are 100-250 percent heavier than lightweight, passive elastic-response feet. For example, Össur’s Vari-Flex® foot weighs 700g and the BiOM® foot weighs more than 2,000g.
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