Influence of posterior pedicle screw fixation at L4–L5 level on biomechanics of the lumbar spine with and without fusion: a finite element method
Abstract Background Posterior pedicle screw (PS) fixation, a common treatment method for widespread low-back pain problems, has many uncertain aspects including stress concentration levels, effects on adjacent segments, and relationships with physiological motions. A better understanding of how post...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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BMC
2021-10-01
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| Series: | BioMedical Engineering OnLine |
| Subjects: | |
| Online Access: | https://doi.org/10.1186/s12938-021-00940-1 |
| _version_ | 1819026924898353152 |
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| author | Emre Sengul Ramazan Ozmen Mesut Emre Yaman Teyfik Demir |
| author_facet | Emre Sengul Ramazan Ozmen Mesut Emre Yaman Teyfik Demir |
| author_sort | Emre Sengul |
| collection | DOAJ |
| description | Abstract Background Posterior pedicle screw (PS) fixation, a common treatment method for widespread low-back pain problems, has many uncertain aspects including stress concentration levels, effects on adjacent segments, and relationships with physiological motions. A better understanding of how posterior PS fixation affects the biomechanics of the lumbar spine is needed. For this purpose, a finite element (FE) model of a lumbar spine with posterior PS fixation at the L4–L5 segment level was developed by partially removing facet joints (FJs) to imitate an actual surgical procedure. This FE study aimed to investigate the influence of the posterior PS fixation system on the biomechanics of the lumbar spine before and after fusion by determining which physiological motions have the most increase in posterior instrumentation (PI) stresses and FJ loading. Results It was determined that posterior PS fixation increased FJ loading by approximately 35% and 23% at the L3–L4 adjacent level with extension and lateral bending motion, respectively. This increase in FJ loading at the adjacent level could point to the possibility that adjacent segment disease has developed or progressed after posterior lumbar interbody fusion. Furthermore, analyses of peak von Mises stresses on PI showed that the maximum PI stresses of 272.1 MPa and 263.7 MPa occurred in lateral bending and flexion motion before fusion, respectively. Conclusions The effects of a posterior PS fixation system on the biomechanics of the lumbar spine before and after fusion were investigated for all physiological motions. This model could be used as a fundamental tool for further studies, providing a better understanding of the effects of posterior PS fixation by clearing up uncertain aspects. |
| first_indexed | 2024-12-21T05:34:19Z |
| format | Article |
| id | doaj.art-ed5ed276264a48f88fbe32021bff3a8a |
| institution | Directory Open Access Journal |
| issn | 1475-925X |
| language | English |
| last_indexed | 2024-12-21T05:34:19Z |
| publishDate | 2021-10-01 |
| publisher | BMC |
| record_format | Article |
| series | BioMedical Engineering OnLine |
| spelling | doaj.art-ed5ed276264a48f88fbe32021bff3a8a2022-12-21T19:14:28ZengBMCBioMedical Engineering OnLine1475-925X2021-10-0120111910.1186/s12938-021-00940-1Influence of posterior pedicle screw fixation at L4–L5 level on biomechanics of the lumbar spine with and without fusion: a finite element methodEmre Sengul0Ramazan Ozmen1Mesut Emre Yaman2Teyfik Demir3Department of Mechanical Engineering, TOBB University of Economics and TechnologyDepartment of Mechanical Engineering, Karabük UniversityDepartment of Neurosurgery, Gazi University School of MedicineDepartment of Mechanical Engineering, TOBB University of Economics and TechnologyAbstract Background Posterior pedicle screw (PS) fixation, a common treatment method for widespread low-back pain problems, has many uncertain aspects including stress concentration levels, effects on adjacent segments, and relationships with physiological motions. A better understanding of how posterior PS fixation affects the biomechanics of the lumbar spine is needed. For this purpose, a finite element (FE) model of a lumbar spine with posterior PS fixation at the L4–L5 segment level was developed by partially removing facet joints (FJs) to imitate an actual surgical procedure. This FE study aimed to investigate the influence of the posterior PS fixation system on the biomechanics of the lumbar spine before and after fusion by determining which physiological motions have the most increase in posterior instrumentation (PI) stresses and FJ loading. Results It was determined that posterior PS fixation increased FJ loading by approximately 35% and 23% at the L3–L4 adjacent level with extension and lateral bending motion, respectively. This increase in FJ loading at the adjacent level could point to the possibility that adjacent segment disease has developed or progressed after posterior lumbar interbody fusion. Furthermore, analyses of peak von Mises stresses on PI showed that the maximum PI stresses of 272.1 MPa and 263.7 MPa occurred in lateral bending and flexion motion before fusion, respectively. Conclusions The effects of a posterior PS fixation system on the biomechanics of the lumbar spine before and after fusion were investigated for all physiological motions. This model could be used as a fundamental tool for further studies, providing a better understanding of the effects of posterior PS fixation by clearing up uncertain aspects.https://doi.org/10.1186/s12938-021-00940-1BiomechanicsLumbar spinePosterior pedicle screwFinite element method |
| spellingShingle | Emre Sengul Ramazan Ozmen Mesut Emre Yaman Teyfik Demir Influence of posterior pedicle screw fixation at L4–L5 level on biomechanics of the lumbar spine with and without fusion: a finite element method BioMedical Engineering OnLine Biomechanics Lumbar spine Posterior pedicle screw Finite element method |
| title | Influence of posterior pedicle screw fixation at L4–L5 level on biomechanics of the lumbar spine with and without fusion: a finite element method |
| title_full | Influence of posterior pedicle screw fixation at L4–L5 level on biomechanics of the lumbar spine with and without fusion: a finite element method |
| title_fullStr | Influence of posterior pedicle screw fixation at L4–L5 level on biomechanics of the lumbar spine with and without fusion: a finite element method |
| title_full_unstemmed | Influence of posterior pedicle screw fixation at L4–L5 level on biomechanics of the lumbar spine with and without fusion: a finite element method |
| title_short | Influence of posterior pedicle screw fixation at L4–L5 level on biomechanics of the lumbar spine with and without fusion: a finite element method |
| title_sort | influence of posterior pedicle screw fixation at l4 l5 level on biomechanics of the lumbar spine with and without fusion a finite element method |
| topic | Biomechanics Lumbar spine Posterior pedicle screw Finite element method |
| url | https://doi.org/10.1186/s12938-021-00940-1 |
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