Hi there
Research the forums for "splay leg" and look at the splinting. Chickens grown and develop so quickly that if you hold a twisted leg in place for a long enough time, it has the ability to correct itself.
Disregard all the grim reports and advice until you are certain conventional...
I think that is a little extreme. Tendon issues can be corrected with splints quite often?! Or at least to where the chicken is mobile enough to live a good life as well as roost.