I very rarely help on hatches, so most deformed chicks don't make it out.
I've had crooked tires and such before, it happens when you hatch hundreds. Those that survive go in my layer/ mixed pen. It's surprising how they adapt.
If they are really bad, I cull, although that rarely is needed.
I had a rooster who lost both feet to frostbite, I named him Stubby. He actually survived quite well. He died over the winter in the 30 inch snowstorm when I couldn't get to him and he was stuck in a snowdrift. I had given him a ground level shelter in the run, but unfortunately couldn't get in the run to rescue him.
I know this sounds cruel to many, but on my property, the strong survive. I want my animals to be able to withstand the elements (exception: my three albinos they do get a output special treatment, extra shelter, avoiding direct strong light, etc. I'm not sure what they can take)