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Clinical application of lumbosacral somatosensory evoked potential to patients with lumbosacral disc herniation

Wei Dongning, Geng Xiaofei, Li Xiaojing et al. Department of Neurology, 309 Division, General Hospitol of PLA, Beijing 100091, China  
Objective To evaluate the role of lumbosacral somatosensory evoked potential (LSSEP) examination in the diagnosis of lumbosacral disc herniation (LDH). Methods Somatosensory evoked potential (SEP) from posterior tibial nerve, L_4, L_5 and S_1 dermatomes SEP, and lumbosacral SEP was recorded in 54 patients with radiculopathy caused by LDH. Results The SEP from posterior tibial nerve was abnormal in 22 cases (40.74%). The SEP from L_5 and/or S_1 dermatome was abnormal in 47 cases (87.04%, P0.01), and the SEP from lumbosacral nerve was abnormal in 52 cases (96.30%, P0.01). The abnormality of SEP from lumbosacral nerves (L_ 2-3, L_ 3-4, L_ 4-5 and L_5S_1) was detected mainly in patients with L_3, L_4, L_5 and S_1 LDH. Conclusion The LSSEP was a sensitive method for the diagnosis of the disc herniation.
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