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KMID : 0860920040060020156
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Journal of the Korean Association EMG-Electrodiagnostic Medicine
2004 Volume.6 No. 2 p.156 ~ p.159
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H Reflex and It´s Relation to the Findings of Needle Electromyography in S1 Radiculopathy
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Chae Su-Han
Kwon Hee-Kyu
Yoon Dae-Won
Lee Hang-Jae
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Abstract
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Objective:0 To evaluate the relation between H reflex and findings of needle electromyography in
patients with S1 radiculopathy.
Method: Electrophysiologic data of 41 patients (male 23, female 18, average age 53±17.2) who had
been diagnosed as S1 radiculopathy were obtained. The S1 radiculopathy was confirmed by H reflex and
needle electromyography study. The H reflex findings were classified into 3 groups: absent, delayed, normal.
Needle electromyography findings were classified into 3 groups: normal; type 1 abnormality, abnormal
spontaneous activities and abnormal motor unit potentials; type 2 abnormality, abnormal motor unit
potentials only. The Mann-Whitney U test was used for statistical analysis.
Results: Out of 41 patients with S1 radiculopathy, H reflex was unobtainable in 20 patients, of delayed
latency in 7 patients and of normal findings in 14 patients. Type 1, 2 abnormalities and normal needle
electromyography findings were shown in 7, 12, 1 cases in 20 patients with absent H reflex, respectively,
and 2, 3, 2 cases in 7 patients with delayed H reflex, respectively. Even in 14 patients with normal H
reflex, 7 patients showed type 1 abnormality and 7 patients showed type 2 abnormality. Based on the
results, there is no relation between H reflex and needle electromyography. (p>0.05)
Conclusion: Abnormal H reflex is not always present in S1 radiculopathy. Abnormality of H reflex
might be related to the involvement of motor or sensory root according to the degree or direction of herniated
nucleus pulposus.
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KEYWORD
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S1 radiculopathy, H reflex, Needle electromyography
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