After surgery, military personnel whose legs have been crushed or blasted can end up with a limb that looks healthy but is debilitated by pain and weakness. Some patients even ask for amputations. The Army solution is a sort of scaffold for intact but malfunctioning legs called the Intrepid Dynamic Exoskeletal Orthosis, and now, thanks to a company called Hangar, it's going to be available to civilians too. Basically, the IDEO is a carbon-fiber exo-skeleton that attaches below the knee and connects to a foot plate that fits into a shoe. Taking a step and pushing off the plate loads the IDEO with energy just like a prosthetic running blade. Then it releases, providing auxiliary power to the leg.
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