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Journal of the Korean Academy of Rehabilitation Medicine 1990;14(2):8.
Diagnostic Value of the H Reflex Study in Lumbosacral Radiculopathy
Yeun Lee kim, M.D., Bong-Ok Kim, M.D., Seung Ho Yune, M.D., , Nack Gyu Kang, M.D.*
Department of Rehabilitation Medicine, College of Medicine, Chungnam National Universtiy, *Department of Rehabilitation Medicine, Sun Hospital, Taejon
요천추 신경근 병변에서의 H 반사 검사의 진단적 가치
김은이, 김봉욱, 윤승호, 강낙규*
충남대학교 의과대학 재활의학교실, *대전 선병원 재활의학과

The objectives of this study were to demonstrate the diagnostic value and the clinical usefulness in low back pain patients with suspicious unilateral radiculopathy over lumbosacral area, The subjects of this study were 94 cases with low back pain who underwent electrodiagnostic examination including H reflex study at Chungnam National University Hospital during the period from March 1,1989 to June 30, 1990. Thirty normal subjects aged from 18 to 49 years served as controls for this study. The meas difference in the H reflex latency of both legs of 30 normal subjects was little as 0.01±0.54 msec and it was statistically nonsignificant (P>0.05).

Ninety-six cases with low back pain were divided into 3 groups which consisted of lumbar radiculopathy, including S1 radiculopathy and normal EMG groups. These groups consisted of 5.33 and 56 patients respectively. H reflex latency was measured in both legs.

The mean was 0.28±0.51 msec in lumbar radiculopathy and 1.75±1.22 msec in including S1 radiculopathy group, So the mean difference of S1 radiculopathy group was significantly prolonged. Therefore, in patients with S1 radiculopathy, a mean difference of more than 1.0 msec would indicate an abnormality.

The H reflex was present but prolonged in latency as compared to the unaffected side in 19 cases. it was absent in the affected side in 11 cases and the sum was 30 cases among 33 cases with S1 radiculopathy confirmd by EMG examination.

So the H reflex study was a diagnostic aid in unilateral S1 radiculopathy in addition traditional EMG study, Especially, side to side difference of H reflex was highly correlated than predicted value of Johnson or the actual value of Lee. In conclusion. the H reflex study can be easily done all EMG laboratories and so it will increase the chance for accuracy in the diagnosis of radiculopathy or in the determination of the level of the lesion.

Key Words: H reflex, Lumbosacral radiculopathy


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