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. 2022 Mar 23;22:110. doi: 10.1186/s12883-022-02641-1

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© The Author(s) 2022

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

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Fig. 1 — DSSEPs results from a 51-year-old male in the EI/FI group. The DSSEPs were performed at cervical neutral (A), 20° extension (B) and 35° flexion (C) positions for a patient. The latencies of N9, N13 and N20 waves and the amplitudes of N13 and N20 waves are shown in the figure. The patient’s DSSEP N13 amplitude improved by 58.1 and 20.7% at extension and flexion positions respectively compared to the neutral position, meeting the criteria for entering both EI and FI groups (> 20%)