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The median nerve is not the only compression neuropathy of the wrist
The ulnar nerve can become compressed at the level of the wrist as it 1) enters Guyon's canal or 2) or as the deep branch curves around the hook of the hamate
Compression can occur due to carpal bone fractures, local inflammation, ganglias, lipomas, anatomic abnormalities, etc
In sports medicine, the most common mechanism is injury is seen in cyclists (cyclist/handlebar palsy)
http://www.hughston.com/hha/b_15_3_2a.jpg
Also seen in those who participate in racquet sports, baseball, and golf
Symptoms can be isolated motor (claw hand = rare), sensory or both
http://en.academic.ru/pictures/enwiki/85/Ulnar_claw.jpg
Can be associated w/ median nerve compression
Tx: Activity modification such as wearing padded gloves, padding the object, or changing hand position on the handlebars
If above fails, surgical decompression is very effective.