Biomechanical evaluation of a novel pedicle screw-based interspinous spacer: A finite element analysis

Hsin Chang Chen, Jia Lin Wu, Shou Chieh Huang, Zheng Cheng Zhong, Shiu Ling Chiu, Yu Shu Lai, Cheng Kung Cheng

Research output: Contribution to journalArticle

Abstract

Interspinous spacers have been designed to provide a minimally invasive surgical technique for patients with lumbar spinal stenosis or foraminal stenosis. A novel pedicle screw-based interspinous spacer has been developed in this study, and the aim of this finite element experiment was to investigate the biomechanical differences between the pedicle screw-based interspinous spacer (M-rod system) and the typical interspinous spacer (Coflex-F™). A validated finite element model of an intact lumbar spine was used to analyze the insertions of the Coflex-F™, titanium alloy M-rod (M-Ti), and polyetheretherketone M-rod (M-PEEK), independently. The range of motion (ROM) between each vertebrae, stiffness of the implanted level, the peak stress at the intervertebral discs, and the contact forces on spinous process were analyzed. Of all three devices, the Coflex-F™ provided the largest restrictions in extension, flexion and lateral bending. For intervertebral disc, the peak stress at the implanted segment decreased by 81% in the Coflex-F™, 60.2% in the M-Ti and 46.7% in the M-PEEK when compared to the intact model. For the adjacent segments, while the Coflex-F™ caused considerable increases in the ROM and disc stress, the M-PEEK only had small changes.

Original languageEnglish
Pages (from-to)27-32
JournalMedical Engineering and Physics
Volume46
DOIs
Publication statusAccepted/In press - Aug 2017

Fingerprint

Finite Element Analysis
Polyether ether ketones
Finite element method
Intervertebral Disc
Articular Range of Motion
Spine
Titanium alloys
Spinal Stenosis
Titanium
Stiffness
Pathologic Constriction
Equipment and Supplies
Pedicle Screws
polyetheretherketone
Experiments

Keywords

  • Finite element method
  • Implant design
  • Interspinous spacer
  • Spine biomechanics

ASJC Scopus subject areas

  • Biophysics
  • Biomedical Engineering

Cite this

Biomechanical evaluation of a novel pedicle screw-based interspinous spacer : A finite element analysis. / Chen, Hsin Chang; Wu, Jia Lin; Huang, Shou Chieh; Zhong, Zheng Cheng; Chiu, Shiu Ling; Lai, Yu Shu; Cheng, Cheng Kung.

In: Medical Engineering and Physics, Vol. 46, 08.2017, p. 27-32.

Research output: Contribution to journalArticle

Chen, Hsin Chang ; Wu, Jia Lin ; Huang, Shou Chieh ; Zhong, Zheng Cheng ; Chiu, Shiu Ling ; Lai, Yu Shu ; Cheng, Cheng Kung. / Biomechanical evaluation of a novel pedicle screw-based interspinous spacer : A finite element analysis. In: Medical Engineering and Physics. 2017 ; Vol. 46. pp. 27-32.
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AB - Interspinous spacers have been designed to provide a minimally invasive surgical technique for patients with lumbar spinal stenosis or foraminal stenosis. A novel pedicle screw-based interspinous spacer has been developed in this study, and the aim of this finite element experiment was to investigate the biomechanical differences between the pedicle screw-based interspinous spacer (M-rod system) and the typical interspinous spacer (Coflex-F™). A validated finite element model of an intact lumbar spine was used to analyze the insertions of the Coflex-F™, titanium alloy M-rod (M-Ti), and polyetheretherketone M-rod (M-PEEK), independently. The range of motion (ROM) between each vertebrae, stiffness of the implanted level, the peak stress at the intervertebral discs, and the contact forces on spinous process were analyzed. Of all three devices, the Coflex-F™ provided the largest restrictions in extension, flexion and lateral bending. For intervertebral disc, the peak stress at the implanted segment decreased by 81% in the Coflex-F™, 60.2% in the M-Ti and 46.7% in the M-PEEK when compared to the intact model. For the adjacent segments, while the Coflex-F™ caused considerable increases in the ROM and disc stress, the M-PEEK only had small changes.

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