It seems, in retrospect, like an obvious device to make. Crutches have been around nearly forever, but the idea of a light wrap-around frame is new. We could have built such things of light wood easily enough--but nobody did.
I suppose one thing that militated against their invention earlier was rutted roads and uneven ground. It helps to be able to set the gadget down and have it stay straight, so you can push down on both sides and keep your balance. We have sidewalks now. Still, even in a plowed field it would be less tiring than a pair of crutches.
I had to use one. Was waaaaaaaaaaay better than crutches.
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