There is no treatment for a twisted tibia according to info I have read. I have never treated it. Many chickens can get around with certain leg problems, but many people end up putting some down if they fail to be able to move around to get food and water. There are some with varus or valgus deformity that can get around as long as there hock tendon holds up. In the last link in my last post, that is an older article, but contains a lot of good info. I would add 2 chicks from his batch in case you end up putting this chick down at some point. If he is a he, and goes to a ranch with other roosters, he would probably be killed with a disabilty, I am afraid.