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The value of somatosensory evoked potentials in intraoperative evaluation of indirect decompression effect of oblique lumbar interbody fusion for lumbar spinal stenosis

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Abstract

Purpose

The aim of this study was to explore the relationship between intraoperative somatosensory evoked potential (SEP) amplitude changes and clinical outcomes of OLIF indirect decompression for degenerative lumbar spinal stenosis (DLSS).

Methods

A prospective study was performed on 201 patients who received oblique lumbar interbody fusion (OLIF) in our hospital from July 2017 to May 2021 due to single segmental DLSS. The patients were divided into three groups: group A (mild DLSS), group B (moderate DLSS), and group C (severe DLSS). The P40 amplitude during operation were recorded, and the clinical efficacy was evaluated by JOA score 1 year postoperative. ROC curves for satisfactory efficacy of P40 amplitude improvement rate and CSA improvement rate were established. Pearson correlation was used to analyze the relationship between P40 improvement rate and JOA improvement rate.

Results

In group A and group B, the improvement rate of JOA in P40 significantly improved group was significantly greater that in improved group and unimproved group (Pa = 0.009; Pb < 0.000). No significant among-subgroup differences in group C (all P > 0.05). In both groups A and B, there was a significant difference in the improvement rate of P40 amplitude between the satisfactory group and the ineffective group (Pa = 0.013; Pb = 0.001), while in group C, there was no statistical significance (Pc = 0.107). By variable Person correlation analysis, a significant positive correlation was obtained between JOA improvement rate and P40 amplitude improvement rate in groups A and B (r1 = 0.27, P1 = 0.02; r2 = 0.508, P2 = 0.001), no correlation between the two in group C (r3 = 0.243, P3 = 0.056). The area under the ROC for assessing surgical efficacy in terms of CSA improvement rate was 0.813 (95% CI: 0.737–0.889, P < 0.001) and 0.767 (95% CI: 0.677–0.856, P < 0.001) in group A and group B, respectively, with satisfactory efficacy cutoff points of 50.18% and 67.89%.

Conclusion

For mild and moderate DLSS, the intraoperative P40 amplitude improvement rate can predict the improvement of clinical symptoms after surgery and can be used as a reference index to assess the effect of indirect decompression. For severe DLSS, the P40 amplitude improvement rate has limited significance in guiding indirect decompression, and OLIF indirect decompression is not the right treatment for this type of patients.

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Data availability

The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.

Code availability

Not applicable.

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Acknowledgements

The authors would like to thank all study participants who were enrolled in this study.

Funding

This study was supported by Ningxia Provincial Key Research and Development Planed Projects (No. 2020BEG03034).

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Authors and Affiliations

Authors

Contributions

All the authors contributed to the study conception and design. Zhiqiang Wang and Shulong Yang contributed equally to this work. Material preparation, data collection, and analysis were performed by Dr Zhiqiang Wang and Dr Shulong Yang. The first draft of the manuscript was written by Dr Zhiqiang Wang and Dr Shulong Yang, and critical revision was done by Dr Simin Liang, Wanzhong Yang, Anli Shi, Wei Guo, and Wei Yang. Project administration was carried out by Dr Zhaohui Ge. All the authors commented on the previous versions of the manuscript. All the authors read and approved the final manuscript.

Corresponding author

Correspondence to Zhaohui Ge.

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Ethics approval

This study was approved by the Ethics Committee of the General of Ningxia Medical University (No. 2019–38) and performed according to the tenets of the Declaration of Helsinki.

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Written informed consent was obtained from all enrolled patients.

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The authors declare no competing interests.

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Wang, Z., Yang, S., Liang, S. et al. The value of somatosensory evoked potentials in intraoperative evaluation of indirect decompression effect of oblique lumbar interbody fusion for lumbar spinal stenosis. International Orthopaedics (SICOT) 47, 2055–2064 (2023). https://doi.org/10.1007/s00264-023-05790-1

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