Chick Foot Issue

[Book]

I have a chick almost a week old that is not using one of his legs/feet. Some how with all the rest of them I missed this. He does seem to be thriving. I need advice on what to do. This is a fist for us.

Video of it hopping around on one leg: http://instagram.com/p/rOKgUxMGHW/

 

[Eggcessive]

Make sure that it isn't splay leg. It could be a slipped tendon, or a rotated tibia. The tendon issue is best helped within the first day, but you can still try to fix it. A rotated tibia is a birth defect. Poultry vitamins with minerals in the water would be a good treatment. Here are some links for you:
https://sites.google.com/a/poultrypedia.com/poultrypedia/poultry-podiatry
http://www.poultryhub.org/health/disease/types-of-disease/leg-and-skeletal-problems/
https://www.backyardchickens.com/t/756556/slipped-tendon-splayed-leg-confused