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Journal of the Korean Academy of Rehabilitation Medicine 1982;6(2):2.
Clinical Usefulness of H Reflex in Low Back Pain Patients
Jae Ho Moon, M.D. , Jung Soon Shin, M.D.
Department of Rehabilitation Medicine, Yonsei University College of Medicine
요통환자에 대한 H Reflex Study의 임상적 의의
문재호, 신정순
연세대학교 의과대학 재활의학과

This study was designed to assess the clinical usefulness of the H reflex in cases of unilateral S1 radiculopathy.

Sixty-two low back pain patients were divided into 3 groups which consisted of L5 radiculopathy, S1 radiculopathy and normal EMG groups. These groups of 23, 16 and 23 patients respectively were matched for sex, age, duration between onset and electrodiagnostic study and the level of root involvement.

H reflex latency was measured in both legs. The mean difference of each group was 0.23 msec (-0.9 msec~1.3 msec), 1.55 msec (-0.5 msec~5.0 msec) and 0.49 msec (-0.9 msec~1.5 msec) respectively.

This data supported the hypothesis of prolongation or absence of the H reflex latency on the affected side of the unilateral S1 radiculopathy. In 75% of S1 radiculopathy cases reviewed, the mean difference was more than 1.0 msec, 43.8% patients more than 1.5 msec and only 37.5% patients showed a mean difference of more than 2.0 msec.

Therefore in patients with S1 radiculopathy a mean difference of more than 1.0 msec would indicate an abnormality.

Key Words: H reflex, Low back pain, Radiculopathy


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