A method for objectively verifying the efficacy of manipulative therapy is provided. The method includes performing a first dermatomal somatosensory evoked potentials test (82) on a patient (12) to establish a baseline response of the nerve latency period. A manipulative therapy technique (88) is then performed on the patient to relieve nerve root compression. A second dermatomal somatosensory evoked potentials test (90) is then performed, to establish a post-manipulation nerve latency period.
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