Hoffmann sign
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HOFFMANN SIGN
Hoffmann sign is flexion and adduction of the thumb in response to sudden flexing of the distal joint of the ipsilateral middle finger; other fingers may also flex.This patient also had thumb clonus in response to the test (see video). Although occasionally found in normal persons, a positive Hoffmann sign usually indicates the presence of pyramidal track disease - in this case the result of compression of the cervical cord by subluxed vertebrae and herniated discs (see CT scan). |