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Biomechanical effects of posterior lumbar interbody fusion with vertical placement of pedicle screws compared to traditional placement

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World Journal of Clinical Cases 2024年第20期12卷 4108-4120页

作者： Ji-Hong Jiang Chang-Ming Zhao Jun Zhang Rong-Ming Xu Lei Chen Department of Orthopedic Surgery Zhejiang University Mingzhou HospitalNingbo 315000Zhejiang ProvinceChina

BACKGROUND The pedicle screw technique is widely employed for vertebral body fixation in the treatment of spinal ***,traditional screw placement methods require the dissection of paraspinal muscles and the insertion of pedicle screws at specific transverse section angles(TSA).Larger TSA angles require more force to pull the muscle tissue,which can increase the risk of surgical trauma and ischemic injury to the lumbar *** To study the feasibility of zero-degree TSA vertical pedicle screw technique in the lumbosacral *** Finite element models of vertebral bodies and pedicle screw-rod systems were established for the L4-S1 spinal segments.A standard axial load of 500 N and a rotational torque of 10 N/m were *** screw pull-out experiment was conducted to observe pedicle screw resistance to pull-out,maximum stress,load-displacement ratio,maximum stress in vertebral bodies,load-displacement ratio in vertebral bodies,and the stress distribution in pedicle screws and vertebral *** between the 0-degree and 17-degree TSA were *** At 0-degree TSA,the screw pull-out force decreased by 11.35%compared to that at 17-degree TSA(P<0.05).At 0-degree and 17-degree TSA,the stress range in the screw-rod system was 335.1-657.5 MPa and 242.8-648.5 MPa,separately,which were below the fracture threshold for the screw-rod system(924 MPa).At 0-degree and 17-degree TSA,the stress range in the vertebral bodies was 68.45-78.91 MPa and 39.08-72.73 MPa,separately,which were below the typical bone yield stress range for vertebral bodies(110-125 MPa).At 0-degree TSA,the load-displacement ratio for the vertebral bodies and pedicle screws was slightly lower compared to that at 17-degree TSA,indicating slightly lower stability(P<0.05).CONCLUSION The safety and stability of 0-degree TSA are slightly lower,but the risks of screw-rod system fracture,vertebral body fracture,and rupture are within acceptable limits.

关键词： Vertical pedicle screw Pedicle screw technique Transverse section angle lumbosacral segment Finite element analysis

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