Biomechanical changes of the lumbar segment after total disc replacement: Charite®, prodisc® and maverick® using finite element model study

Ki Tack Kim, Sang Hun Lee, Kyung Soo Suk, Jung Hee Lee, Bi O. Jeong

Research output: Contribution to journalArticle

Abstract

Objective: The purpose of this study was to analyze the biomechanical effects of three different constrained types of an artificial disc on the implanted and adjacent segments in the lumbar spine using a finite element model (FEM). Methods: The created intact model was validated by comparing the flexion-extension response without pre-load with the corresponding results obtained from the published experimental studies. The validated intact lumbar model was tested after implantation of three artificial discs at L4- 5. Each implanted model was subjected to a combination of 400 N follower load and 5 Nm of flexion/extension moments. ABAQUSTM version 6.5 (ABAQUS Inc., Providence, RI, USA) and FEMAP version 8.20 (Electronic Data Systems Corp., Plano, TX, USA) were used for meshing and analysis of geometry of the intact and implanted models. Results: Under the flexion load, the intersegmental rotation angles of all the implanted models were similar to that of the intact model, but under the extension load, the values were greater than that of the intact model. The facet contact loads of three implanted models were greater than the loads observed with the intact model. Conclusion: Under the flexion load, three types of the implanted model at the L4-5 level showed the intersegmental rotation angle similar to the one measured with the intact model. Under the extension load, all of the artificial disc implanted models demonstrated an increased extension rotational angle at the operated level (L4-5), resulting in an increase under the facet contact load when compared with the adjacent segments. The increased facet load may lead to facet degeneration.

Original languageEnglish (US)
Pages (from-to)446-453
Number of pages8
JournalJournal of Korean Neurosurgical Society
Volume47
Issue number6
DOIs
StatePublished - Jan 1 2010
Externally publishedYes

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Keywords

  • Artificial disc
  • Facet contact load
  • Finite element model
  • Lumbar spine
  • Rotation angle
  • von-Mises stress

ASJC Scopus subject areas

  • Surgery
  • Neuroscience(all)
  • Clinical Neurology

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