I know this is an old article, but just in case it helps someone else, this sounds as though the chicks tendons were misplaced. I had one like this - its legs were stuck out to the front and it literally dragged itself to move - occasionally flapping its wings - it almost looked like a bat crawling on a wall. Anyway, I worked with it because I knew it had stood briefly at first hatching, so figured it wasn't anything too serious.
I spent a few hours gently massaging the legs and stretching them out backwards (I did this roughly for a few minutes roughly every half hour), as well as holding the chick up hanging its legs and putting the feet to the ground. Having gone to bed and seen no change I was awoken a few hours later by a very happy little chick bragging very loudly about being able to strut its stuff. I don't know if I overdid it because that chick could really jump, and ran the fastest backwards I've ever seen, but I am certainly not complaining.
I too have had these situations where I've helped a chick out of the egg and though probably not the best move, sometimes you can get over it so I post this just in case it works for someone else.