TY - JOUR
T1 - Biomechanical evaluation of a novel pedicle screw-based interspinous spacer
T2 - A finite element analysis
AU - Chen, Hsin Chang
AU - Wu, Jia Lin
AU - Huang, Shou Chieh
AU - Zhong, Zheng Cheng
AU - Chiu, Shiu Ling
AU - Lai, Yu Shu
AU - Cheng, Cheng Kung
N1 - Funding Information:
This research is partially supported by the National Science Council of Taiwan and the Taiwan Food and Drug Administration . The grant numbers are “NSC 103-2321-B-010-030 ”, “NSC 103-2320-B-010-004 -MY3” and “ 102TFDA-JFDA-203 ”.
Publisher Copyright:
© 2017 IPEM
PY - 2017/8
Y1 - 2017/8
N2 - 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.
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.
KW - Finite element method
KW - Implant design
KW - Interspinous spacer
KW - Spine biomechanics
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U2 - 10.1016/j.medengphy.2017.05.004
DO - 10.1016/j.medengphy.2017.05.004
M3 - Article
C2 - 28622909
AN - SCOPUS:85020748430
SN - 1350-4533
VL - 46
SP - 27
EP - 32
JO - Medical Engineering and Physics
JF - Medical Engineering and Physics
ER -