Hybrid Pedicle Screw and Modified Cortical Bone Trajectory Technique in Transforaminal Lumbar Interbody Fusion at L4-L5 Segment: Finite Element Analysis
Overview
Physiology
Authors
Affiliations
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 were established according to the three 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, von Mises stress of the fixation, intervertebral cage, and rod were compared under a 400-N compressive load with 7.5 Nm moments in flexion, extension, bending, and rotation.
Results: BPS-BMCS technique has the lowest ROM in extension and rotation, and BMCS-BMCS technique has the lowest ROM in flexion and lateral bending. The BMCS-BMCS technique showed maximal cage stress in flexion and lateral bending, and the BPS-BPS technique in extension and rotation. Compared to the BPS-BPS and BMCS-BMCS technique, BPS-BMCS technique presented a lower risk of screw breakage and BMCS-BPS technique 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.
Li X, Abdel-Latif K, Schwab J, Zhou X, Yang J, Ritter Z Front Bioeng Biotechnol. 2025; 13:1541114.
PMID: 40041103 PMC: 11876142. DOI: 10.3389/fbioe.2025.1541114.
Wu L, Jiang X, Guan T, He Z, Li J Heliyon. 2024; 10(19):e38929.
PMID: 39435082 PMC: 11491909. DOI: 10.1016/j.heliyon.2024.e38929.
Ding Y, Zhang H, Jiang Q, Li T, Liu J, Lu Z Front Bioeng Biotechnol. 2024; 12:1393005.
PMID: 38903190 PMC: 11186988. DOI: 10.3389/fbioe.2024.1393005.
Liu G, Huang W, Leng N, He P, Li X, Lin M Bioengineering (Basel). 2024; 11(5).
PMID: 38790385 PMC: 11117612. DOI: 10.3390/bioengineering11050519.
Wang Y, Maimaiti A, Xiao Y, Tuoheti A, Zhang R, Maitusong M Heliyon. 2024; 10(5):e26294.
PMID: 38434416 PMC: 10906328. DOI: 10.1016/j.heliyon.2024.e26294.