I have a black sex link with the same problem -- one day, she was walking on her "elbows," and I thought I should put her down. But she was so perky, ate when I helped her out, drank water. I checked her legs, and they were not broken. I tried to isolate her, but none of the flock would have it, so she pokes her head in a corner and hangs out. It's been about 4 weeks. I give her extra special love (petting), an occasional baby aspirin, and put electrolytes/vitamin for poultry (small, small amount, about 1 tablespoon to 8 gallons of water), and make sure no one picks on her (they others don't -- in fact, she has a hen buddy who brings her stuff to eat and looks after her).
She is much better now. She's walking upright, but has to sit at times when she goes too far. She is not roosting, but she is making it into the nesting box to lay, and she's productive and alert. Occasionally she goes back to elbow walking, but I don't see this as a problem, as long as she's vibrant, eating and laying. I am worried about her roosting, for warmth and fellowship, in the cold Alaska winters, but we'll see how it goes.
I believe she jumped from the roosting area to the ground and landed awkwardly. Possible broke her hip/back, and injured her wing, which sometimes flaps off to the side as if it is not part of her. But she seems to be getting it together. She would have been chicken stock had it not been for the look in her eye, her overall perky demeanor, and a neighbor who could harvest her was unable to do so that day.
I give her Ecotrin (coated) 81 mg low-dose aspirin about once a week. The only thing is, early on, she would then feel well enough to do too much, and then she seemed worse the next day. So I quit it for about 3 weeks and let her recover on her own. She seems to be up on her legs just fine now, in no pain, and she's a survivor. Just give her love, time, electrolytes/vitamins, and help her eat and drink. I set up a chick water feeder near where she likes to hide, and even though the other birds drain it, too, I think it helped. I then just gave everyone electrolytes/vitamins in their water, and it's all good now.
I thought about running some methylpredinisone through her, in a very small dose, but it's expired, and I don't want to make her so mobile that she hurts herself again.
That's my story!
Alaska Farm Girl