Wartenberg Thumb Reflex



Forceful flexion of the fingers at the distal IP joints produces (Adduction, flexion, and opposition of the thumb) INSTEAD of a normal response of abduction and extension.  



This is a manifestation of a corticospinal tract lesion and has been called the upper extremity equivalent of Babinski’s plantar sign. 



This is distinct from unrelated Wartenberg sign in ulnar neuropathy.  



Dr. Boby Varkey Maramattom @bobvarkey



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