Welcome to BackYard Chickens. The Best of Luck with your Hen. And a Big Hello from Eastern Nebraska!
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So happy you have joined us. So sorry about your flock 

We're so happy you've decided to join us 

Did you ever figure out what caused it? We have the same issue with one of our hens?No predator enclosure well protected, she started with a limp and I found no injuries. Even splinted it for week but still limping no it's a ball

- Your birds might be experiencing Marek's disease - have you noticed any other symptoms? You might want to post in the Emergencies/Diseases Section. Here's a link. Praying that this will be resolved, and again, I'm so sorry that you're dealing with this 