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Tests for distal ulnar nerve entrapment
Ask patient to hold a piece of paper between the thumb and the index finger
Normally this is a fairly simple task.
With an unlar nerve palsy, the patient will substitute with the FPL (flexor pollicis longus - median nerve innervation). This causes flexion of the thumb in order to maintain the grip since the adductor pollicis cannot be used. This causes thumb flexion rather than extension.
http://www.mims.com/resources/drugs/common/CP0042.gif
http://www.youtube.com/watch?v=yJTIhm1VfSI