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Old 12-05-2013
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Anatomy Ulnar nerve injury, ?error in uworld

So in uworld it states that an injury of the ulnar nerve at the medial epicondyle of the elbow "classically results in an ulnar claw"...I thought an injury at the elbow was more likely to affect the flexor digitorum profundus and therefore cause simple paralysis of the 4th and 5th digits with them extended, and an injury at the wrist will cause the classic claw as the flexor digitorum profundus is spared...several online sources seem to contradict each other with this, what do ppl think??
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Old 12-05-2013
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Originally Posted by USMLEUK. View Post
So in uworld it states that an injury of the ulnar nerve at the medial epicondyle of the elbow "classically results in an ulnar claw"...I thought an injury at the elbow was more likely to affect the flexor digitorum profundus and therefore cause simple paralysis of the 4th and 5th digits with them extended, and an injury at the wrist will cause the classic claw as the flexor digitorum profundus is spared...several online sources seem to contradict each other with this, what do ppl think??
I think we shd go with what Kaplan said. Which is exactly what uworld is saying. Forget about varying option online. Uworld scarcely makes mistakes if any.
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Old 12-05-2013
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I hate stuff like this because if it turns up in the exam ill just sit and second guess everything...

emedicine says: the 4th and 5th digits naturally adopt a flexed position at the PIPJ and DIPJ in the absense of ulnar extension at these joints due to the natural tension of the ligaments

So I think a lesion both above a below the level of flex dig prof "classically" causes a claw, but a more distal lesion causes a more pronounced claw due to sparing of flex dig.
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Old 12-05-2013
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Originally Posted by USMLEUK. View Post
I hate stuff like this because if it turns up in the exam ill just sit and second guess everything...

emedicine says: the 4th and 5th digits naturally adopt a flexed position at the PIPJ and DIPJ in the absense of ulnar extension at these joints due to the natural tension of the ligaments

So I think a lesion both above a below the level of flex dig prof "classically" causes a claw, but a more distal lesion causes a more pronounced claw due to sparing of flex dig.
yeah wikipedia also said the same thing as well.
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