Because I currently have some severe knee problems I've been trying to find a way to help myself keep on walking to some extent. I am trying to adapt to a knee brace but not sure it is helping. I got some poles which are a variation of Nordic walking poles. The ones I now have are made by a company called UrbanPoling, although I am sure there are others available. Unlike the standard Nordic pole they come with what's called a "bell tip" and after trying it I have to say the difference in stability provided is akin to the difference between tottering along in high heels and wearing well made sneakers. The handle has a wide ledge on which you can apply some weight which takes stress off lower limbs and at the same time builds up upper body strength. The walking technique is somewhat different from standard Nordic walking and the poles are definitely better for people with balance issues.
I am specifically using them to help "off-load" some weight from my knee as it turns out there is no way to give me a brace which off-loads anything as all the "compartments" of my knee joint are involved - nowhere to off-load to!