usmletopper2
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pronator drift is caused by UMN lesion ,can anyone explain the underlying mech?
normally supinators are weaker than pronators,what hahhens in umn do pronators become weak???  and cause pronator drift?
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| truedoc
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good question. Anyone with the answer?
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| peter90036
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wasnt this cerebellar?
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| mukho
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Following is what I found written for pronator drift, drift in general and cerebellar drift....supinators remain weaker
Testing for pronator drift
With an UMN lesion there is pronation and downward drift of the outstretched supinated arm. This is because the pronators overpower the weaker supinators. Another name for this sign is a pronator Babinski.
Drifting is the movement of one or both arms from an initially neutral position. It is the result of upper motor neurone, pyramidal lesions.
There are three causes of the weakness causing drifting:
pronator drift
cerebellar disease
posterior column loss
To test for cerebellar drifting, the patient is asked to hold both arms fully extended at shoulder level in front of him, with the palms upwards.
If cerebellar drift is present then this is secondary to hypotonia and the drift is usually upwards.
http://www.gpnotebook.co.uk/simplepage.cfm?ID=-53... for reference...i didnt know there were different types of drifts!!
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| usmletopper2
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Thank you so much mukho
this is what i understood-
umn lesion- downward pronator drift
cerebellar-upward drift
post columns-psuedochoriathetoid drift
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| WaqasQureshi
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yes pronator drift is due to UMN problem
there is difference of tones between flexor and extensor as welll as pronators and supinators. Embryologically, pronators are like extensors. In UMN, there is more EXTENSOR response, so even a small increase in tone can be noted by drifting of hands into pronation.
I hope others have explained how is it done. This is quite sensitive for UMN and is being used in various screening tests for evolving STROKES
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