I have a buddy that was in a car wreck and his knee is fucked up. Reconstructive surgery and what not. He's not fully disabled in so much as he can walk and stand, but anything beyond short stairways and he's toast. He can never come hiking because of his knee and a tool like this might help, a small amount. (Which means a net positive of easy trails he can handle)

I'm fortunately not quite that bad of but I've been recently feeling the long-term impacts of the motorcycle wreck that I was in 5 years ago, mainly on my ankle. Getting it looked at soon, luckily but, I'm not able to be on my feet too long without weeks of pain after anymore. This tech is directly in line with the sort of ankle brace that I think would be helpful - reducing the effective weight on the ankle joint in a dynamic manner would be very enabling.