Chick holds leg out strangely and won't use it. Need advice.

[tslaven]

For my first attempt at hatching, I have just one chick who is about 6 days old now. He was fine and strong from the beginning. After about 3 days he started holding one leg out straight to the side. He has been in the brooder by himself so I'm unsure of what happened. I did have him on straw, and maybe he slipped? The affected leg appears to be strong and formed like the other. I have him on sand now. Should I use the band aid trick I saw on this sight? Will that for e him to put weight in the leg which he may be avoiding due to pain. Anyone have any ideas?