The biomechanical effects of Ti versus PEEK used in the PLIF surgery on lumbar spine: a finite element analysis

January 12, 2021

. 2021 Jan 11;1-10.

doi: 10.1080/10255842.2020.1869219.

Online ahead of print.

Affiliations

¹ Key Laboratory of High Efficiency and Clean Manufacturing, School of Mechanical Engineering, Shandong University, Jinan, China.
² National Demonstration Center for Experimental Mechanical Engineering Education, School of Mechanical Engineering, Shandong University, Jinan, China.
³ Department of Orthopedics, Qilu Hospital of Shandong University, Jinan, China.
⁴ Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, FL, USA.

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Hongwei Wang et al.

Comput Methods Biomech Biomed Engin.

2021.

. 2021 Jan 11;1-10.

doi: 10.1080/10255842.2020.1869219.

Online ahead of print.

Affiliations

¹ Key Laboratory of High Efficiency and Clean Manufacturing, School of Mechanical Engineering, Shandong University, Jinan, China.
² National Demonstration Center for Experimental Mechanical Engineering Education, School of Mechanical Engineering, Shandong University, Jinan, China.
³ Department of Orthopedics, Qilu Hospital of Shandong University, Jinan, China.
⁴ Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, FL, USA.

Item in Clipboard

Abstract

Titanium (Ti) and polyetheretherketone (PEEK) are commonly used in posterior lumbar interbody fusion (PLIF). The study investigated biomechanical effects of Ti versus PEEK used as materials of cage and rods on the lumbar spine. Four different configurations of PLIF were constituted. Stiff Ti rods provided satisfactory initial stability but increased the stress on rods significantly under simulated physiological load conditions. Ti cage increased the stress on bone endplates significantly. Materials of cage and rods had insignificant effects on the nucleus pressure and facet joint force of non-instrumented segments. Further clinical studies and follow-up observations are essential for corroborating these findings.

Keywords:

Lumbar spine; PEEK; Ti; finite element analysis; posterior lumbar interbody fusion.

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