Finite element analysis of cervical spine with different constrained types of total disc replacement

Chien Yu Lin, Shih Youeng Chuang, Chang-Jung Chiang, Yang-Hwei Tsuang, Weng Pin Chen

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Various designs of cervical total disc replacement (CTDR) have been introduced and employed in an attempt to avoid disadvantages of the fusion surgery. The purposes of this study were to evaluate the effects of the range of motion (ROM), the instantaneous center of rotation (ICR) and the facet joint force (FJF) with different constrained types of CTDR devices. A three-dimensional finite element (FE) model of intact cervical spine (C3-7) was made from CT scans of a normal person and validated. Postoperative FE models simulating CTDR implantation at the C5-6 disc space were made for CTDR-I (constrained design) and CTDR-II (nonconstrained design), respectively. Hybrid protocol (intact: 1 Nm) with a compressive follower load of 73.6 N was applied at the superior endplate of the C3 vertebral body. The inferior endplate of C7 vertebral body was constrained in all directions. At the index level, CTDR-I showed a higher increase in segmental motion and FJF than CTDR-II in extension, lateral bending and axial rotation. The CTDR-II with an elastomer-type core reproduced a near physiological ICR of the intact model in extension and axial rotation. Abnormal kinetic and kinematic changes related to the CTDR may induce surgical level problems and cause long-term failure of spinal surgery.

Original languageEnglish
Article number1450038
JournalJournal of Mechanics in Medicine and Biology
Volume14
Issue number3
DOIs
Publication statusPublished - 2014

Keywords

  • Cervical total disc replacement
  • facet joint
  • finite element model
  • instantaneous center of rotation
  • range of motion

ASJC Scopus subject areas

  • Biomedical Engineering

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