PN making the rotation throughout the body has been and is my experience. I have not had my hands lock, but what happens to me is similarly freaky.
My fingers jump sometimes when I am trying to hold objects.
Back in the days of my hospital time, for months my hands felt like they wanted to close almost to be a relaxed fist. This has improved somewhat, but I have a tremor in my hands now especially when I try to straighten my fingers.

Since we have such similar situations, I am willing to bet that this will settle down. Can you e mail your dr. and mention it?