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Old 02-01-2012
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MusculoSkeletal Site of Ulnar Nerve Damage and different effects?

what does ulnar nerve with fracture at the medial epicondyle paralyze?
does it also causes loss of abduction and adduction of fingers and claw hands or that is only with fracture of hook of Hamate, as FA says?
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Old 02-01-2012
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it innervates the anterior medial muscles of the arm also (those that are not covered by median nerve) so, I'd assume if u cut it at medial epicondyle - them muscles in the hand and arm both will get denervated.
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Old 02-01-2012
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Best way to differentiate.
When the ulnar nerve is damaged at the medial epiondyle -flexor ulnaris will be injured so on flexing the wrist it will deviate towards the radial side.

This finding will be absent in case of injury to the nerve at the hamate bone. It will just have claw hand of the little and the ring finger + loss sensation of those finger along with hypothenar muscles.
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Old 02-01-2012
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if im not mistaken, fracture at the medial condyle will:

- cause radial deviation upon flexion of the wrist
- atrophy of hypothenar
- loss of adduction of the thumb
- ulnar claw hand (digits 4 and 5 are clawed at rest)

i think those are the main ones,
if i forgot anything (this is off the top of my head) please feel free to add!

ps. why do they call it radial deviation? to me, that means in the direction of the radial nerve (posterior) so flexion of the wrist makes it deviate to the back? flexion with extension deviation? that makes no sense to me lol.
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Old 08-01-2012
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Quote:
Originally Posted by Dr.NickRiviera View Post
if im not mistaken, fracture at the medial condyle will:

- cause radial deviation upon flexion of the wrist
- atrophy of hypothenar
- loss of adduction of the thumb
- ulnar claw hand (digits 4 and 5 are clawed at rest)

i think those are the main ones,
if i forgot anything (this is off the top of my head) please feel free to add!

ps. why do they call it radial deviation? to me, that means in the direction of the radial nerve (posterior) so flexion of the wrist makes it deviate to the back? flexion with extension deviation? that makes no sense to me lol.
you get radial deviation of the wrist upon flexion in case of ulnar nerve injury at the medial epicondyle because there is no force balancing or opposing the flexing carried out by the other wrist flexor which is flexor carpi radialis which is supplied by the median nerve.

wrist flexors, are flexor carpi ulnaris found on your medial forearm side, and flexor carpi radialis found laterally on your forearm.

I hope that makes sense now.
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