Thanks so much for the reply. You have given me a lot to think about. This did just start over night about 3 days ago, it has not improved much. I can't think of how she could have injured herself, but with such an overnight onset I would lean toward injury.
The splint or sling ideas sound good, I just don't know if I am talented enough to make something that would work. I will give it a try.
I do see your point about this getting worse the larger and heavier she gets...I think I will give it a week or two, and then seriously consider culling her if there is no improvement
I'd give her longer than a week or two, personally, because whatever this is, if average time for healing joint damage is anything to go by, it's fairly unlikely to fix up within a week or two. About a month, perhaps. Maybe two. With a sling, the weight gain won't be too much of a problem. Only leaving her unsupported would be an issue.
The longest I spent on a leg injury in a chicken (a cockerel doing the involuntary splits, due to pelvic injury with secondary weakening of legs due to overcompensating then getting stuck in the wrong position) --- was 6 months. (!) But he did walk again.
Obviously he was growing during this time because he was injured as a chick only a few weeks older than yours, and his recovery was made slower by me not knowing to use a sling back then; instead I kept him with his legs in the correct position for lying down, in a box. How could he strengthen them that way?! Very slowly is the answer... He made it, but with a sling I think it would have taken less than a month.
While this is serious, her legs have sufficient structural integrity left that I don't think it's a worst case scenario. Unless she actually has necrosis in there but it doesn't really look like it, I'm leaning towards this being a drug reaction more than injury or genetic disease. I've seen chickens with worse legs recover but of course it's still a serious case and one of the best things you can do is limit how much more damage they can do. I was wincing watching the videos, because she's teetering nonstop on the brink of worsening her injuries as her legs just fluctuate wildly and uncontrollably out of normal range of motion.
Still, it's hopeful that she retains ability to stand and even walk at all.
With a sheep I have, her front knees fused into a bent position as a lamb; in less than 48 hours she was recovered. So it can vary widely. Joints usually heal slowly but the lamb had fused joints, not broken or strained joints, so with better circulation and positioning things corrected very quickly. However I was expecting to spend the next two weeks to a month daily putting her in the sling and massaging her legs. Didn't occur.
I wish we lived in the same country, I'd be keen to lend a hand and see if this little one can get back into functional status. If you really don't want to cull her but can't help her or don't have the time or resources or know-how or whatever, someone may take her off your hands to try to help. Some people (myself included) love the challenge and reward and education of rehabilitating.
As for how to make her a sling, I'll link you to a website that may help, but asides from that it's pretty simple; you need two holes for her legs and one for her to poop out of, (if the sling is in the way, depends on the design) and the material needs suspending so that she can't climb out of it, and can rest her legs, or take her weight on them, as she feels the need or ability.
I'd feel around under her after putting her in the sling, to see whether the fabric is cutting into her circulation anywhere, but really birds are pretty simple to make slings for. Making a sling for the lamb was a headache, especially because she'd bolt up out of there and over the fence of her rehab pen when I tried to leave, bent legs notwithstanding; I ended up putting her into baby clothing, sleeves and all, to keep her in there.
Here's the website:
Quote: It's got a lot of suggestions, lots of good info, and some very generalized info because it's impossible really to specify when you don't know the case intimately. And different things have worked for different people so some things are contradictory or conflicting.
Sorry to offer you a whole page of results, but here's a wide variety of chicken slings people have made for a whole spectrum of leg and other problems:
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Hope this helps. If she recovers from this, she'll be one sweet and trusting little pet. While I personally wouldn't breed her in case her issue had some genetic link, just in case, I'd still value such a hen, they can be good taming influences on the rest of the flock. Good luck!
Best wishes.