Finite analysis of stability between modified articular fusion technique, posterior lumbar interbody fusion and posteriorlateral lumbar fusion

Han, Xiao; Chen, Xin; Li, Kuan; Li, Zheng; Li, Shugang

doi:10.1186/s12891-021-04899-x

Cited by 7 publications

(10 citation statements)

References 24 publications

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“…Previous studies have indicated that that the application of interbody fusion cage and screw-rod system establishes an effective stress conduction pathway, which makes the stress of internal fixation system dispersed [ 36 ]. The use of interbody fusion cage can bear more pressure in the anterior column and reduce the stress of the screw-rod system, which is also confirmed by our study results.…”

Section: Discussionmentioning

confidence: 99%

“…In order to obtain a convenient internal fixation model, combined with previous studies and PLIF operation, a simplified lumbar pedicle screw (diameter 6.5 mm, length 45 mm) and connecting rod (diameter 5.5 mm) were designed. Because the sliding of the screw in the vertebral body was not considered, we removed the screw thread in order to simplify the analysis without affecting the results of the study we were concerned about [ 35 , 36 ]. Two pedicle screws were placed in L4 and L5 vertebrae, respectively.…”

Section: Methodsmentioning

confidence: 99%

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Biomechanical evaluation of different sizes of 3D printed cage in lumbar interbody fusion-a finite element analysis

Wu¹,

Qi²,

Yang³

et al. 2023

BMC Musculoskelet Disord

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Objective To study the biomechanical characteristics of various tissue structures of different sizes of 3D printed Cage in lumbar interbody fusion. Methods A finite element model of normal spine was reconstructed and verified. Pedicle screws and Cage of different sizes were implanted in the L4/5 segment to simulate lumbar interbody fusion. The range of motion of the fixed and cephalic adjacent segment, the stress of the screw-rod system, the stress at the interface between cage and L5 endplate, and intervertebral disc pressure of the adjacent segment were calculated and analyzed. Results The range of motion and intervertebral disc pressure of the adjacent segment of each postoperative model were larger than those of the intact model, but there was not much difference between them. The stress of cage-endplate interface was also larger than that of the intact model. However, the difference is that the stress of the endplate and the screw-rod system has a tendency to decrease with the increase of the axial area of cage. Conclusions Cage with larger axial area in lumbar interbody fusion can reduce the stress of internal fixation system and endplate, but will not increase the range of motion and intervertebral disc pressure of adjacent segment. It has a certain effect in preventing the cage subsidence, internal fixation system failure and screw rod fracture.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Biomechanical evaluation of different sizes of 3D printed cage in lumbar interbody fusion-a finite element analysis

Wu¹,

Qi²,

Yang³

et al. 2023

BMC Musculoskelet Disord

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“…In 2010, Fan et al used calf specimens to analyze the changes in ROM after bilateral pars fractures and discovered that ROM increased substantially to 132.1% in flexion–extension and to 148.8% in axial rotation, but no substantial change occurred in lateral bending [ 27 ]. In Wang’s FE study [ 19 ], the Bipars model was remarkably unstable in extension and rotation, which increased by 206% and 260%, respectively, compared with the INT model. Our study corroborated these findings, revealing instabilities in the extension and rotation of the lumbar spine.…”

Section: Discussionmentioning

confidence: 99%

“…Wang et al, using finite element (FE) analysis, found that bilateral pars fractures increased vertebral body displacement, disc stress, endplate stress, and the posterior ligament force of the affected segment under extension and torsion, increasing the risk of early disc degeneration [ 18 ]. Han et al created FE models of an intact lumbar spine (INT) and a spine with PLF and reported that PLF can stabilize the lumbar spine [ 19 ]. Demir et al [ 20 ], in a similar study using a model of the Dynesys system, demonstrated that the Dynesys system can provide stability.…”

Section: Introductionmentioning

confidence: 99%

Biomechanical Effects of a Novel Pedicle Screw W-Type Rod Fixation for Lumbar Spondylolysis: A Finite Element Analysis

et al. 2023

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Lumbar spondylolysis involves anatomical defects of the pars interarticularis, which causes instability during motion. The instability can be addressed through instrumentation with posterolateral fusion (PLF). We developed a novel pedicle screw W-type rod fixation system and evaluated its biomechanical effects in comparison with PLF and Dynesys stabilization for lumbar spondylolysis via finite element (FE) analysis. A validated lumbar spine model was built using ANSYS 14.5 software. Five FE models were established simulating the intact L1–L5 lumbar spine (INT), bilateral pars defect (Bipars), bilateral pars defect with PLF (Bipars_PLF), Dynesys stabilization (Bipars_Dyn), and W-type rod fixation (Bipars_Wtyp). The range of motion (ROM) of the affected segment, the disc stress (DS), and the facet contact force (FCF) of the cranial segment were compared. In the Bipars model, ROM increased in extension and rotation. Compared with the INT model, Bipars_PLF and Bipars_Dyn exhibited remarkably lower ROMs for the affected segment and imposed greater DS and FCF in the cranial segment. Bipars_Wtyp preserved more ROM and generated lower stress at the cranial segment than Bipars_PLF or Bipars_Dyn. The injury model indicates that this novel pedicle screw W-type rod for spondylolysis fixation could return ROM, DS, and FCF to levels similar to preinjury.

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“…It is crucial to note that this experiment did not account for screw slippage within the vertebral body. The screw threads were cut out of the analysis to speed things up without affecting the study's conclusions (Liu et al, 2020;Han et al, 2021). To replicate osteoporotic features, we altered the values of several model components while keeping other variables constant.…”

Section: Model Simulationmentioning

confidence: 99%

A comparative analysis of using cage acrossing the vertebral ring apophysis in normal and osteoporotic models under endplate injury: a finite element analysis

Wang,

Geng,

et al. 2023

Front. Bioeng. Biotechnol.

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Background: Lateral lumbar fusion is an advanced, minimally invasive treatment for degenerative lumbar diseases. It involves different cage designs, primarily varying in size. This study aims to investigate the biomechanics of the long cage spanning the ring apophysis in both normal and osteoporotic models, considering endplate damage, using finite element analysis.Methods: Model 1 was an intact endplate with a long cage spanning the ring apophysis. Model 2 was an endplate decortication with a long cage spanning the ring apophysis. Model 3 was an intact endplate with a short cage. Model 4 was an endplate decortication with a short cage. On the basis of the four original models, further osteoporosis models were created, yielding a total of eight finite element models. The provided passage delineates a study that elucidates the utilization of finite element analysis as a methodology to simulate and analyze the biomechanical repercussions ensuing from the adoption of two distinct types of intervertebral fusion devices (cages) within the physiological framework of a human body.Results: The investigation found no appreciable changes between Models 1 and 2 in the range of motion at the fixed and neighboring segments, the L3-4 IDP, screw-rod stress, endplate stress, or stress on the trabecular bone of the L5. Increases in these stresses were seen in models 3 and 4 in the ranges of 0.4%–676.1%, 252.9%–526.9%, 27.3%–516.6%, and 11.4%–109.3%, respectively. The osteoporotic models for scenarios 3 and 4 exhibit a similar trend to their respective normal bone density models, but these osteoporotic models consistently have higher numerical values. In particular, except for L3-4 IDP, the maximum values of these parameters in osteoporotic Models 3 and 4 were much higher than those in normal bone quality Models 1 and 2, rising by 385.3%, 116%, 435.1%, 758.3%, and 786.1%, respectively.Conclusion: Regardless of endplate injury or osteoporosis, it is advised to utilize a long cage that is 5 mm longer on each side than the bilateral pedicles because it has good biomechanical features and may lower the likelihood of problems after surgery. Additionally, using Long cages in individuals with osteoporosis may help avoid adjacent segment disease.

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Finite analysis of stability between modified articular fusion technique, posterior lumbar interbody fusion and posteriorlateral lumbar fusion

Cited by 7 publications

References 24 publications

Biomechanical evaluation of different sizes of 3D printed cage in lumbar interbody fusion-a finite element analysis

Biomechanical evaluation of different sizes of 3D printed cage in lumbar interbody fusion-a finite element analysis

Biomechanical Effects of a Novel Pedicle Screw W-Type Rod Fixation for Lumbar Spondylolysis: A Finite Element Analysis

A comparative analysis of using cage acrossing the vertebral ring apophysis in normal and osteoporotic models under endplate injury: a finite element analysis

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