Measurement of Quadriceps Reflex in Spastic Paralysis

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Abstract
A method of measuring electrical potentials from the quadriceps femoris in reflex action (knee jerk) using a constant stimulus is described. In normal subjects the amplitude of the reflex potential could be increased by various means, including the classical "reinforcement" (Jendrassik maneuver). In patients with spastic hemiplegia or paraplegia, however, the reflexes could not be reinforced significantly. This failure to change characterized the "normal" and the affected side in hemiplegic patients. It was also possible to distinguish the normally hyperactive reflex from the pathologic one. Some theoretical implications were discussed.

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