Final answer:
Ulnar deviation typically has a greater range of motion than radial deviation because of the anatomical arrangement of the wrist, which allows the ulnar side more extensive movement.
Step-by-step explanation:
The comparison between the normal range of motion during radial and ulnar deviation primarily demonstrates that ulnar deviation is generally greater than radial deviation. Radial deviation involves the movement of the wrist towards the thumb side, while ulnar deviation moves the wrist towards the pinky side.
Given the anatomical structure of the wrist and the orientation of the carpals, the range of ulnar deviation usually surpasses that of radial deviation. This is due to the arrangement of the bones and ligaments in the wrist and the fact that the ulnar side of the wrist is not as constrained as the radial side, allowing for more extensive movement.