I have a chicken who looked very much like yours. I took it home when no one else would thinking I would apply some spraddle leg techniques and vitamins. I was able to rotate the leg into place, but it would never stay. We had exercise sessions to help it move and develop some strength. Brought it to the vet who told us that this was indeed a deformity from birth and would not be fixed by my efforts. I know it is necessary at times to cull, but it fought others from birth to reach food and water, so I had to give it a chance. It hops and flaps with its left leg to the back and right leg twisted under its belly ( I can see the twist occurring in your chick's right leg too) and yes lands its face in the ground at times, but never gives up moving. We discovered it was a rooster and he is 5months old now. He is the sweetest thing, loves yogurt, gets along with our other chickens, flies out of the raised coop every morning and flies back in at night. I know it's not ideal for all, but it works for us. Good luck with your chick!
