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Hoffman's Sign - definition

Hoffman’s sign can be a feature of myelopathy involving the cervical spinal cord. It is a test performed by doctors during their neurological examination. By holding a patient’s hand so that it is weightless, and flicking the nail of their middle finger, a positive test (i.e. one suggesting central nervous disease) causes a reflex to make their thumb and index finger contract spontaneously as per this video.