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Journal of the Korean Academy of Rehabilitation Medicine 2001;25(4):609-614.
Relation between Symptom Duration and Abnormal Spontaneous Activity in S1 Radiculopathy.
Kwon, Bum Sun , Lee, Seong Jae , Park, Chung Hyun , Chun, Dong Jin
Department of Rehabilitation Medicine, College of Medicine, Dankook University.
제1천수 신경근병변에서 증상 기간에 따른 비정상 자발 전위의 발현 양상
권범선, 이성재, 박충현, 전동진
단국대학교 의과대학 재활의학교실
Abstract

Objective
It is a widely accepted belief that paraspinal muscles tend to show spontaneous activity on needle electromyography early on in a radiculopathy and distal muscles become abnormal later on. But most studies have shown the limitations of using symptom duration when interpreting electrodiagnostic findings in radiculopathy. The purpose of this study was to determine the relationship between symptom duration and abnormal spontaneous activity in S1 radiculopathy confined to abnormal H-reflex.


Method
A retrospective study that collected the informations on symptom duration and spontaneous activity in paraspinal muscle and gastrocnemius for 112 patients with S1 radiculopathy diagnosed by unilateral H-reflex abnormality was undertaken.


Results
Abnormal spontaneous activity in paraspinal muscle had shown a significant negative correlation with symptom duration, that is a tendency to decrease its expression over symptom duration. On the contrary abnormal spontaneous activity in gastrocnemius muscle was rare at first a few weeks and became to show after 7 weeks. Patients with symptom duration over 1 year had higher incidence of having no abnormal spontaneous activities both in paraspinal and gastrocnemius muscle.


Conclusion
These results suggested that symptom duration had a potential role in the diagnosis of S1 radiculopathy when H-reflex were abnormal unilaterally.

Key Words: Paraspinal muscle, Spontaneous activity, H-reflex, S1 radiculopathy


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