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Hoffmann's Sign

Hoffman's sign means upper motor neuron injury.  The Hoffmann's reflex test itself involves loosely
test itself involves ... holding the middle finger ... and flicking the fingernail ... when there is flexion ... thumb on the same hand
Hoffmann's sign was originally described as follows: the test is performed by supporting the patient's hand
Hoffmann's sign ... as follows: the test ... the patient's hand ... the examiner's fingernail ... present if rapid flexion