Wow I wish I had known about that sponge trick a few years ago. I had a chicken born with extremely bad leg/foot deformities and splayed legs. I did the hobble thing mentioned at the bottom of that url, but I made it out of band-aides. I also had to tape each individual toe because they were all trying to point in the wrong direction. The chick was a bantam, and extra small at that so it was very difficult.
She was probably not meant to live, she had such problems from the start! She hatched a few hours earlier than she should have and some unabsorbed egg yolk stuck to the inside of the egg while she rested. When she finally shoved her way out, she pulled some of her intestine out through the hole that the yolk gets absorbed in! (I didn't realize it was intestine at first, I thought it was just more yolk until I did some research) I was horrified! I picked her up and cleaned the area. I gently tucked the intestine back inside, cleaned the her again and covered the whole area with plastic wrap to keep it moist. Eventually the yolk dried up and fell off.
Her legs never truly Straightened but they did become strong enough to support her weight and her toes straightened out very well. She can even run! I ended up naming her 'Bandy' because of all the boxes of band-aides I went through fixing her legs. lol.