As a result of load lifting a 68-year-old female felt acute pain in the lumbar region, in a buttock, posterolateral surface of her right thigh, external surface of the right shin and dorsal surface of foot. Objectively: weakness of the anterior ti-bial muscle, long extensor muscle of the right toes, short extensor muscle of the right toes. Low Achilles reflex on the right. Positive Lasegue's sign. What examination method would be the most effective for specification of the diagnosis of discogenic compression of L5 root?