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KMID : 0378019830260010125
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New Medical Journal
1983 Volume.26 No. 1 p.125 ~ p.136
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Electromyographic Analysis of Lumbo-Sacral Nerve Root Lesions
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Abstract
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The subjects of this study were 208 persons who received electromyography examination for low back pain or herniated lumbar intervertebral disc at Severance Hospital during the period January 1, 1981 to December 31, 1981. Analysis of patients general characteristics and the results of nerve conduction studies and EMG findings in patients with radiculopathy was carried out.
The subjects were 126 (60.6%) males and 82 (39.4%) females, showing a male-female sex ratio of 6 : 4. Their average was 33.8 years with the largest group 20-39 years of age (125 persons or 60.1%). The majority of patients came for EMG examination within 12 months after onset of back pain.
Patient diagnosed as having radiculopathy through EMG examination were 69 of these, 34(49.2%) showed signs of lesion in the 5th lumbar nerve root. Patient showing signs of radiculopathy were compared with normal group for nerve conduction velocity, amplitude of action potential, distal latency of peroneal and posterior tibial nerves. In comparison with normal group (A), result showed the peroneal distal latency difference in the two groups was 0. 4 msec. The radiculopathy group was delayed. The posterior tibial nerve distal latency difference. was 0.9 msec, also delayed in the radiculopathy group. In comparison with normal group (B) , the differences were in the right peroneal nerve 0.3 msec, and in the posterior tibial nerve, 1. 4 msec on the left and 1. 3 msec or the right. The radiculopathy results were delayed in the above cases.
The nerve conduction velocities showed no difference when compared with normal group (A), but when compared with normal group (B), the left posterior tibial nerve conduction velocity was 2.1 m/sec decreased in the radiculopathy group.
Sensory nerve conduction studies were carried out in the sural and superficial peroneal nerves. The latency in the sural nerve was 0.4 msec faster in the radiculopathy group and the latency in the superficial peroneal nerve, 0.2 msec faster in the radiculopathy group also. Action potential amplitudes showed an increase of 9 uV in the superficial peroneal nerve of the radiculopathy group and 14 uV in the sural nerve, also of the radiculopathy group.
In 11 different lower extremity muscles, a total of 955 muscles were examined by EMG on both right and left sides. Diagnosed radiculopathy patients showed rates of 60.5% polyphasic potentials, 20.8% insertional activity, 7.9% positive sharp waves and 6.8% fibrillation potentials in total group.
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