Is this a slipped tendon?

[lgyure85]

Got a call yesterday from the local Stockdales that one of the new chicks wasn't walking. I picked it up, and initially thought it was a a spraddle, but now I think it may be a slipped tendon. Here is a pic of how she holds it.

 

[Wyorp Rock]

It's hard to tell. Is the hock (joint) swollen? A better photo of the leg without the hobbles may be helpful.

I would provide her with some B2 (riboflavin) also.