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A novel less invasive endoscopic-assisted procedure for complete reduction of low-and high-grade isthmic spondylolisthesis performed by anterior and posterior combined approach

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Abstract

Purpose

The optimal surgical management of low- and high-grade isthmic spondylolisthesis (LGS and HGS -IS) is debated as well as whether reduction is needed especially for high-grade spondylolisthesis.

Both anterior and posterior techniques can be associated with mechanical disadvantages as hardware failure with loss of reduction and L5 injury. We purpose a novel endoscopic-assisted technique (Sled technique, ST) to achieve a

complete reduction in two surgical steps: first anteriorly through a retroperitoneal approach to obtain the greatest part of correction and then posteriorly to complete reduction in the same operation.

Methods

ST efficacy and complications rate were evaluated through a retrospective functional and radiological analysis.

Results

Thirty-one patients, 12 male (38.7%) and 19 female (61.3%), average age: 45.4 years with single level IS underwent olisthesis reduction by ST. Twenty-three IS involved L5 (74.2%), 7 L4 (22.5%) and 1 L3 (3.3%). No intraoperative complications were recorded. One patient required repositioning of a pedicle screw.

A significant improvement of functional and radiological parameters (L4-S1 and L5-S1 lordosis) outcomes was recorded (p < 0.001).

Conclusion

ST provides a complete reduction in the slippage in LGS and HGS. The huge anterior release as well as the partial reduction in the slippage by the endoscopic-assisted anterior procedure, because of the cage is acting as a “guide rail”, facilitate the final posterior reduction, always complete in our series, minimizing mechanical stresses and neurological risks.

ClinicalTrials.gov Identifier: NCT03644407.

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Data availability

No data have been fabricated or manipulated (including images) to support our conclusions. No data, text, or theories by others are presented as if they were the author’s own (“plagiarism”).

Code availability

‘Not applicable’ for that section.

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The authors have no personal financial or institutional interest (financial or non-financial) in any of the drugs, materials, or devices described in this article.

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Correspondence to Carlotta Morselli.

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This research did not receive any specific grant from founding, agencies in the public, commercial, or not-for-profit sectors. Any acknowledgments for grants technical support or corporate support were necessary.

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Ethic Committee approval was not requested for this study. Clinical and Radiological de-identified registries were used to track patients care and outcome without a direct patient involvement even if all patients gave their written informed consent to publish their data for the Institutional Spine registry: (Galeazzi Spine Surgery Registry “SPINEREG”).

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Informed consent was obtained from each patient included in the study. Copyright to reproduce materials was not necessary.

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Bassani, R., Morselli, C., Cirullo, A. et al. A novel less invasive endoscopic-assisted procedure for complete reduction of low-and high-grade isthmic spondylolisthesis performed by anterior and posterior combined approach. Eur Spine J 32, 2819–2827 (2023). https://doi.org/10.1007/s00586-023-07666-9

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  • DOI: https://doi.org/10.1007/s00586-023-07666-9

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