The sort that could be used for torture?
I'm guessing that a hell of a lot of nerve damage occurs.
We're looking at it being in there for a minute, probably, but I might alter that depending on effects.
Would the person be unable to use said arm for the rest of her life? I know it would be horribly ugly (she's gonna cover it up with a long sleeve and a glove), and I'm pretty sure her arm would be numb, but would there be other damage?