Thanks Dace. It does help a bit. I know the ankle is so complicated it's often hard to deduce what's causing the problems.

I once asked if the machine was a tens unit and was told it's more than that. Guess because they can hook 2 patients to it simultaneously. Yesterday I overheard one of the other therapists saying he didn't want to hook one of his patients up to it as he didn't want something (muscle??) overstimulated. That's what precipitated my concern. Should've asked the therapist directly, but didn't see her again for the rest of the session. I will have a discussion on my next visit as I'm also not sure why this 'treatment' is being given. Her mission is to break up the scar tissue in my foot.