My little brother sprained his foot a view days ago. He couldn't put much weight on it, and where we didn't carry him, he hopped and crawled. Someone gave him a stick to hobble around on, but he didn't like it very much, and it scratched up our nice wood floors, so I modified it a bit.
The stick is just a sawed off broom/rake handle. I took a piece of wood from another project (it's actually a piece of a branch from the woods, peeled, cut and sanded) and nailed it to the top to make a handle he could grasp more easily. Then I cut a rubber bouncy ball in half and attached it with putty to the bottom so he could use it inside on the wood floors.
I gave it to him, and he was delighted! He used it more like a cane or walking stick, but it could also easily work as a crutch, especially if you made a set of them. He used it for about 15 minutes, then left it somewhere and forgot it so had to get up without using it.
Whereupon he discovered he could walk on the foot now! Most excellent news. And now we have a stick for next time one of the little kids hurts themselves...
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