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  • Title: Electrophysiologic correlates of weakness in L5/S1 radiculopathy.
    Author: Scelsa SN, Berger AR, Herskovitz S.
    Journal: Electromyogr Clin Neurophysiol; 2001; 41(3):145-51. PubMed ID: 11402506.
    Abstract:
    INTRODUCTION: Management of patients with radiculopathy involves estimating the degree of physiologic and anatomic injury, and weighing that to predict the likely clinical course. OBJECTIVE: To determine whether low distal peroneal and tibial CMAP amplitudes correlate with weakness and fibrillations of functionally relevant muscles in L5/S1 radiculopathy (LSR). METHODS: We reviewed clinical and electrophysiologic data in 66 consecutive patients with LSR. RESULTS: A significantly greater number of patients with low peroneal CMAP amplitudes had weakness of L5 (p = 0.025) and S1 innervated leg muscles (p < 0.001). Low tibial CMAP amplitudes were also associated with weakness of S1 innervated muscles (p < 0.038). The association of low peroneal CMAP amplitudes with weakness persisted when weakness of at least 3 muscles was considered in the analysis for L5 (p < 0.0001) and S1 (p = 0.014) innervated muscles. CONCLUSIONS: Low peroneal and tibial CMAP amplitudes may serve as surrogate measures for segmental weakness of functionally relevant muscles in LSR.
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