Dynamic lumbar pedicle screw-rod stabilization: in vitro biomechanical comparison with standard rigid pedicle screw-rod stabilization

Journal of Neurosurgery. Spine
Hakan BozkuşN R Crawford

Abstract

It is unclear how the biomechanics of dynamic posterior lumbar stabilization systems and traditional rigid pedicle screw-rod systems differ. This study examined the biomechanical response of a hinged-dynamic pedicle screw compared with a standard rigid screw used in a 1-level pedicle screw-rod construct. Unembalmed human cadaveric L3-S1 segments were tested intact, after L4-5 discectomy, after rigid pedicle screw-rod fixation, and after dynamic pedicle screw-rod fixation. Specimens were loaded using pure moments to induce flexion, extension, lateral bending, and axial rotation while recording motion optoelectronically. Specimens were then loaded in physiological flexion-extension while applying 400 N of compression. Moment and force across instrumentation were recorded from pairs of strain gauges mounted on the interconnecting rods. The hinged-dynamic screws allowed an average of 160% greater range of motion during flexion, extension, lateral bending, and axial rotation than standard rigid screws (p < 0.03) but 30% less motion than normal. When using standard screws, bending moments and axial loads on the rods were greater than the bending moments and axial loads on the rods when using dynamic screws during most loading modes (...Continue Reading

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Citations

Dec 30, 2011·European Spine Journal : Official Publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society·Werner SchmoelzAlexander C Disch
Mar 13, 2014·The Spine Journal : Official Journal of the North American Spine Society·Xiaolei SunPaul C McAfee
Dec 3, 2013·The Spine Journal : Official Journal of the North American Spine Society·Dean K StolworthyAnton E Bowden
Jun 20, 2013·Advances in Orthopedics·Olcay EserAli Fahir Ozer
Jan 18, 2013·Advances in Orthopedics·Cengiz GomleksizAli Fahir Ozer
May 15, 2015·Journal of Craniovertebral Junction and Spine·Ali Fahir OzerDeniz Ufuk Erbulut
Apr 9, 2014·Computer Methods in Biomechanics and Biomedical Engineering·T OktenogluV K Goel
May 8, 2010·The Open Orthopaedics Journal·Ali Fahir OzerSabri Aydin
May 6, 2021·European Spine Journal : Official Publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society·Wei FanMing Zhang

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