That could be. The owner said she's taken it to the vet who felt that the joint may be infected and prescribed antibiotics. But I was thinking a 3D printed splint might help, like this one for sale by MPC.
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I'd be willing to have a vet perform surgery or amputate once it is old enough.
And your EE is adorable!

I love that she's outside being a "real" chicken. Gives me home that we might be able to get Myrtle out with some mellow chickens from our flock - my Silkies, maybe, or my lavender Orpington. Definitely something to strive for!
Myrtle has been doing so well that I feel very confident she'll be fine. I just don't want her to be lonely.