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Pullout strength of reinserted pedicle screws using the previous entry point and trajectory

PURPOSE: This study compared the biomechanics of reinserted pedicle screws using the previous entry point and trajectory with those of correctly inserted pedicle screws. METHODS: The study used 18 lumbar vertebrae (L1–6) from three fresh calf spines to insert 6.5 × 40-mm pedicle screws. A control sc...

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Autores principales: Huang, Xuanwu, Huang, Zixiang, Xu, Liwei, Liang, Dongzhu, Zhang, Meichao, Zhang, Hui
Formato: Online Artículo Texto
Lenguaje:English
Publicado: BioMed Central 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6611027/
https://www.ncbi.nlm.nih.gov/pubmed/31272476
http://dx.doi.org/10.1186/s13018-019-1240-8
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author Huang, Xuanwu
Huang, Zixiang
Xu, Liwei
Liang, Dongzhu
Zhang, Meichao
Zhang, Hui
author_facet Huang, Xuanwu
Huang, Zixiang
Xu, Liwei
Liang, Dongzhu
Zhang, Meichao
Zhang, Hui
author_sort Huang, Xuanwu
collection PubMed
description PURPOSE: This study compared the biomechanics of reinserted pedicle screws using the previous entry point and trajectory with those of correctly inserted pedicle screws. METHODS: The study used 18 lumbar vertebrae (L1–6) from three fresh calf spines to insert 6.5 × 40-mm pedicle screws. A control screw was inserted correctly along the axis of one pedicle, while an experimental screw was reinserted completely using the previous entry point and trajectory in the other pedicle. The experimental screw was removed after being completely inserted in group A and after 80% of the total trajectory inserted in group B. And the experimental screw was removed after 60% of the total trajectory was reached in group C. The biomechanical values of the pedicle screws were measured. RESULTS: There were no significant differences in pedicle screw axial pullout strength between reinserted screws and correct screws in the 3 groups (P(A) = 0.463, P(B) = 0.753, P(C) = 0.753). Stiffness measurement increased for the reinserted screw compared with that of the control screw. Fracturing was observed between the vertebral body and pedicle. CONCLUSION: Theoretically, a surgeon can remove the pedicle screw when necessary, inspect the trajectory, and reinsert the screw using the previous entry point and trajectory.
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spelling pubmed-66110272019-07-16 Pullout strength of reinserted pedicle screws using the previous entry point and trajectory Huang, Xuanwu Huang, Zixiang Xu, Liwei Liang, Dongzhu Zhang, Meichao Zhang, Hui J Orthop Surg Res Research Article PURPOSE: This study compared the biomechanics of reinserted pedicle screws using the previous entry point and trajectory with those of correctly inserted pedicle screws. METHODS: The study used 18 lumbar vertebrae (L1–6) from three fresh calf spines to insert 6.5 × 40-mm pedicle screws. A control screw was inserted correctly along the axis of one pedicle, while an experimental screw was reinserted completely using the previous entry point and trajectory in the other pedicle. The experimental screw was removed after being completely inserted in group A and after 80% of the total trajectory inserted in group B. And the experimental screw was removed after 60% of the total trajectory was reached in group C. The biomechanical values of the pedicle screws were measured. RESULTS: There were no significant differences in pedicle screw axial pullout strength between reinserted screws and correct screws in the 3 groups (P(A) = 0.463, P(B) = 0.753, P(C) = 0.753). Stiffness measurement increased for the reinserted screw compared with that of the control screw. Fracturing was observed between the vertebral body and pedicle. CONCLUSION: Theoretically, a surgeon can remove the pedicle screw when necessary, inspect the trajectory, and reinsert the screw using the previous entry point and trajectory. BioMed Central 2019-07-04 /pmc/articles/PMC6611027/ /pubmed/31272476 http://dx.doi.org/10.1186/s13018-019-1240-8 Text en © The Author(s). 2019 Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. 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.
spellingShingle Research Article
Huang, Xuanwu
Huang, Zixiang
Xu, Liwei
Liang, Dongzhu
Zhang, Meichao
Zhang, Hui
Pullout strength of reinserted pedicle screws using the previous entry point and trajectory
title Pullout strength of reinserted pedicle screws using the previous entry point and trajectory
title_full Pullout strength of reinserted pedicle screws using the previous entry point and trajectory
title_fullStr Pullout strength of reinserted pedicle screws using the previous entry point and trajectory
title_full_unstemmed Pullout strength of reinserted pedicle screws using the previous entry point and trajectory
title_short Pullout strength of reinserted pedicle screws using the previous entry point and trajectory
title_sort pullout strength of reinserted pedicle screws using the previous entry point and trajectory
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6611027/
https://www.ncbi.nlm.nih.gov/pubmed/31272476
http://dx.doi.org/10.1186/s13018-019-1240-8
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