Three wk old chick won't walk on one leg. Help!

[littlekit]

This is my first brood. Six bantams, Orp mutts (4) and 2 dominiques. One little dominique has injured his leg I think. He won't walk on it. I've separated him in a small cage within the brooder and he is now eating and since adding warm water to the mash, taking in fluids. His spirit seems fine. Cannot tell where the injury is exactly.
I'll post a couple pics. if I can figure out how.

 

[Buff Hooligans]

I don't know the answer to this but maybe someone else does... Good luck with the chick.

 

[littlekit]

My chick seems better now. Has gained strength and is standing and even walking some. I've put him back with his group. thank you.