Originally Posted by toly
may I ask you a favor.
Could you provide a verbal definition of radial deviation?
The picture above does NOT say whether it is a planar movement or NOT.
If you can address this issue it would nice as well
a possible definition of ulnar deviation from Wikipedia below
Ulnar deviation is also a physiological movement of the wrist, where the hand including the fingers move towards the ulna. Ulnar deviation is a disorder in which flexion by ulnar nerve innervated muscles is intact while flexion on the median nerve side is not.