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Journal of the Korean Academy of Rehabilitation Medicine 1995;19(4):1.
An Experimental Study on the Change of F Wave in Radiculopathy
Tai Ryoon Han, M.D., Nam Jong Paik, M.D., Shi Uk Lee, M.D., Don Kyu Kim, M.D. , Sun Gun Chung, M.D.*
Department of Rehabilitation Medicine, Seoul National University College of Medicine*, Department of Rehabilitation Medicine, Dankook University College of Medicine
신경근 병변에서의 F파의 변화에 관한 실험적 연구
한태륜, 백남종, 이시욱, 김돈규, 정선근*
서울대학교 의과대학 재활의학교실 및 단국대학교 의과대학 재활의학교실*

F waves are late responses resulting from antidromic activation of motor neurons occuring when the axon is stimulated supramaximally. Because of their long pathway from stimulation site to motor neuron, many studies are reported for the usefulness of F wave in radiculopathy. The sensitivity of F waves in radiculopathy is varying from 18% to 65%. Our purpose was to evaluate the usefulness of F wave in radiculopathy by simulating radiculopathies in rabbits.

With properly anesthesized rabbit, we exposed sciatic nerve at ischial tuberosity level and traced up the nerve trunk to reach the spinal canal level. Then we dissected one of two nerve roots and measured F waves.

The parameters which showed significant difference after root dissection were latency and conduction velocity in upper root dissection and amplitude in lower root dissection. But the normal control levels of such parameters are so wide that the changes of such parameters after root dissection are not useful for evaluation of radiculopathy.

Therfore, our conclusion was that measuring F wave was not so useful for electrodiagnosis of radiculopathy.

Key Words: F-wave, Radiculopathy, Electrodiagnosis


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