Ulnar Neuropraxia12 August, 2010 by: colinparker
A 32 year old man presents with altered sensation and weakness in his right hand, the morning after an Iron Man event.
The event included several hours of cycling, using forearm rests.
This short video clip demonstrates the typical ulnar claw hand posture and weakness of intrinsic hand muscles supplied by the ulnar nerve.
If you look closely, you can see a touch of ‘cheating’ as in Froment’s sign: the thumb is used to supplement the adduction of the fingers. Flexor policis longus is supplied by the (intact) median nerve, whereas the palmar interossei are supplied by the ulnar nerve (remember PAD and DAB: Palmar ADduct and Dorsal ABduct).