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Hoffman's sign is a neurological sign in the hand which is an indicator of problems in the spinal cord. It is associated with a loss of grip. The test for Hoffman's sign involves tapping the nail on the third or forth finger.What does a positive Hoffman sign mean?
A positive Hoffman’s sign may indicate that you have a neurological or nervous system condition that affects the cervical spine nerves or brain. If the sign is positive on only one hand, you may have a condition that only affects one side of your body.What is a negative Hoffman sign?
If there is no movement in the index finger or thumb after this motion, the person has a negative Hoffman's sign. If the index finger and thumb move, the person has a positive Hoffman's sign.