[Jeff]

Bigwill

You write-: "Is it possible that the ulnar deviation is simply an effect, rather than a cause (club pulling the right wrist into ul. dev.)? I would think that with the momentum of the club moving at decent speed, it would be pretty difficult to prevent ul. dev. of the right wrist post impact."

That's how I think of the situation. I think of the right wrist's ulnar deviation action as being passive (reactive to other forces) rather than being active (due to active muscle contractile forces within the right upper limb).

Jeff.