Biomechanical Evaluation of Cortical Bone Trajectory Fixation with Traditional Pedicle Screw in the Lumbar Spine: A Finite Element Study

Su, Kuo‐Chih; Chen, Kun-Hui; Pan, Chien-Chou; Lee, Cheng-Hung

doi:10.3390/app112210583

Cited by 10 publications

(9 citation statements)

References 37 publications

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“…In this study, As for the BPS-BMCS group, the von Mises stress of the screw was lower than those of the BPS-BPS group in motion. As for the BMCS-BPS group, the von Mises stress of the screw was lower than that in the BPS-BPS group in exion, extension, and rotation and the stress variation rules were comparable to those of Su et al [31], BPS-BMCS group and BMCS-BPS group may reduce the incidence of screw breakage. The lowest screw stress was found in the BPS-BMCS (30.12 ± 5.73 MPa) and BMCS-BPS (32.79 ± 4.63 MPa) group in exion.…”

Section: Discussionsupporting

confidence: 70%

“…Increasing the medio-lateral angle of the pedicle screw reduced the risk of screw loosening and breakage [30]. Peak von mises stress of the screw in the hybrid xation technique with CBT and pedicle screw, in Su et al [31], were lower than that of the BPS-BPS technique in exion, extension, and lateral bending. In this study, As for the BPS-BMCS group, the von Mises stress of the screw was lower than those of the BPS-BPS group in motion.…”

Section: Discussionmentioning

confidence: 91%

“…The lowest screw stress was found in the BPS-BMCS (30.12 ± 5.73 MPa) and BMCS-BPS (32.79 ± 4.63 MPa) group in exion. As for BCS-BCS (CBT at the L3 and L4), the von mises stress of the screw was greater than the counterparts in exion and rotation [31], However, the opposite result was found in the present study, which may be related to the greater medio-lateral angle of the MCBT technique than that of the CBT technique as mentioned by Newcomb et al [30]. Huang et al [26] suggest that the longer rod length may decrease the screw stress.…”

Section: Discussionmentioning

confidence: 91%

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Hybrid pedicle screw and modified cortical bone trajectory technique in transforaminal lumbar interbody fusion at L4-L5 segment： finite element analysis

Kahaer

Zhang

Wang

et al. 2023

Preprint

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Background:: Investigate the biomechanical properties of the hybrid fixation technique with bilateral pedicle screw (BPS) and bilateral modified cortical bone trajectory screw (BMCS) in L4-L5 transforaminal lumbar interbody fusion (TLIF). Methods: Three finite element (FE) models of the L1-S1 lumbar spine, including seven ligaments and facet joint cartilage were established according to the four human cadaveric lumbar specimens. BPS-BMCS (BPS at L4 and BMCS at L5), BMCS-BPS (BMCS at L4 and BPS at L5), BPS-BPS (BPS at L4 and L5), and BMCS-BMCS (BMCS at L4 and L5) were implanted into the L4-L5 segment of each FE model. The range of motion (ROM) of the L4-L5 segment, the von Mises stress of the fixation, intervertebral cage, and rod were compared under a 400-N compressive load with 7.5 N/m moments in flexion, extension, bending, and rotation. Results: BPS-BMCS technique has the lowest ROM in extension and rotation, and BMCS-BMCS has the lowest ROM in flexion and lateral bending. The BMCS-BMCS group showed maximal cage stress in flexion and lateral bending, and the BPS-BPS group in extension and rotation. Compared to the BPS-BPS and BMCS-BMCS group, BPS-BMCS presented a lower risk of screw breakage and BMCS-BPS presented a lower risk of rod breakage. Conclusion: The results of this study support that the use of the BPS-BMCS and BMCS-BPS techniques in TLIF surgery for offering the superior stability and a lower risk of cage subsidence and instrument-related complication.

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Section: Discussionsupporting

confidence: 70%

Section: Discussionmentioning

confidence: 91%

Section: Discussionmentioning

confidence: 91%

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Hybrid pedicle screw and modified cortical bone trajectory technique in transforaminal lumbar interbody fusion at L4-L5 segment： finite element analysis

Kahaer

Zhang

Wang

et al. 2023

Preprint

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“…After the mesh convergence test, the mesh size used in this study is 4 mm. All 12 finite element mesh models reached 5% of the stop criteria of convergence test when mesh size convergence test was used [26]. Therefore, the finite element mesh model used in this study was rational.…”

Section: Materials Properties Of the Modelmentioning

confidence: 97%

Investigating the Effects of Different Sizes of Silicone Rubber Vacuum Extractors during the Course of Delivery on the Fetal Head: A Finite Element Analysis Study

Huang

Pan

et al. 2022

Polymers

Self Cite

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During certain clinical situations, some parturients require instruments for operative vaginal delivery, and various designs of vacuum extractors may affect the fetal head. To investigate the biomechanical effects of divergent sizes of silicone rubber vacuum extractors, we employed finite element analysis in this study. First, we constructed computer models for different vacuum extractor sizes (diameters: 40 mm, 50 mm, 60 mm, and 70 mm), flat surface, hemispherical ball, and fetal head shape. A hemispherical ball was the main design for the vacuum extractor model, and the material used for the vacuum extractor was silicone rubber. Next, the settings of 1 mm vacuum extractor displacement and vacuum cap pressure of 60 cmHg were applied. The main observation markers of this study were the respective von Mises stresses on the vacuum extractor and skull by the reaction force on the fixed end. The concluded results revealed that vacuum extractors with larger diameters lead to greater reaction force, stress, and strain on fetal heads. Therefore, this study’s biomechanical analytic consequences suggest that clinicians avoid selecting larger vacuum extractors during operative instrumental delivery so that fetal heads will experience less external force, deformation, and resultant complications. It could also provide a practical reference for obstetricians for instrumental vaginal delivery with the vacuum extractor made of silicone rubber.

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“…In this study only static loading conditions were tested. Su et al [18] investigated the effects of the traditional pedicle screw and cortical bone trajectory screw implantation on the lumbar spine using FE methods. The results showed that there was no significant difference in the structural stability of the lumbar spine model between the traditional pedicle screw system and the cortical bone trajectory system.…”

Section: Introductionmentioning

confidence: 99%

Can a Priori Unknown Values of Biomechanical Parameters Be Determined with Sufficient Accuracy in Mbs Using Sensitivity Analysis? Analyzing the Interaction Characteristics between Cervical Vertebra and Pedicle Screw

Kramer¹,

Bauer²

2022

Preprint

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Finite element (FE) modeling is commonly used as a method to investigate the influence of medical devices, such as implants and screws and their effects on the biomechanical behavior of the spine. Another simulation method is a multi-body simulation (MBS), where the model is composed of several non-deformable bodies. MBS solvers generally require a very short computing time for dynamic tasks compared to an FE analysis. Considering this computational advantage, in this study, we examine whether parameters whose values are not known a priory can be determined with sufficient accuracy using MBS model. Therefore, we propose a Many-at-a-time sensitivity analysis method that allows approximating these a priory unknown parameters without requiring long simulation times. This method enables a high degree of MBS model optimization to be achieved in an iterative process. The sensitivity analysis method is applied to a simplified screw-vertebra model, consisting of an anterior anchor implant screw and vertebral body of C4. An experiment described in the literature is used as a basis for developing and assessing the potential of the method for sensitivity analysis and to validate the models action. The optimal model parameters for the MBS model were determined to be c=823224N/m for stiffness and d=488Ns/m for damping. The presented method of parameter identification can be used in studies including more complex MBS spine models or to set initial parameter values that are not available as initial values for FE models.

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Biomechanical Evaluation of Cortical Bone Trajectory Fixation with Traditional Pedicle Screw in the Lumbar Spine: A Finite Element Study

Cited by 10 publications

References 37 publications

Hybrid pedicle screw and modified cortical bone trajectory technique in transforaminal lumbar interbody fusion at L4-L5 segment： finite element analysis

Hybrid pedicle screw and modified cortical bone trajectory technique in transforaminal lumbar interbody fusion at L4-L5 segment： finite element analysis

Investigating the Effects of Different Sizes of Silicone Rubber Vacuum Extractors during the Course of Delivery on the Fetal Head: A Finite Element Analysis Study

Can a Priori Unknown Values of Biomechanical Parameters Be Determined with Sufficient Accuracy in Mbs Using Sensitivity Analysis? Analyzing the Interaction Characteristics between Cervical Vertebra and Pedicle Screw

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