European Spine Journal

, Volume 21, Supplement 5, pp 675–687 | Cite as

In silico evaluation of a new composite disc substitute with a L3–L5 lumbar spine finite element model

  • Jérôme Noailly
  • Luigi Ambrosio
  • K. Elizabeth Tanner
  • Josep A. Planell
  • Damien Lacroix
Original Article

Abstract

When the intervertebral disc is removed to relieve chronic pain, subsequent segment stabilization should restore the functional mechanics of the native disc. Because of partially constrained motions and the lack of intrinsic rotational stiffness ball-on-socket implants present many disadvantages. Composite disc substitutes mimicking healthy disc structures should be able to assume the role expected for a disc substitute with fewer restrictions than ball-on-socket implants. A biomimetic composite disc prototype including artificial nucleus fibre-reinforced annulus and endplates was modelled as an L4–L5 disc substitute within a L3–L5 lumbar spine finite element model. Different device updates, i.e. changes of material properties fibre distributions and volume fractions and nucleus placements were proposed. Load- and displacement-controlled rotations were simulated with and without body weight applied. The original prototype reduced greatly the flexibility of the treated segment with significant adjacent level effects under displacement-controlled or hybrid rotations. Device updates allowed restoring large part of the global axial and sagittal rotational flexibility predicted with the intact model. Material properties played a major role, but some other updates were identified to potentially tune the device behaviour against specific motions. All device versions altered the coupled intersegmental shear deformations affecting facet joint contact through contact area displacements. Loads in the bony endplates adjacent to the implants increased as the implant stiffness decreased but did not appear to be a strong limitation for the implant biomechanical and mechanobiological functionality. In conclusion, numerical results given by biomimetic composite disc substitutes were encouraging with greater potential than that offered by ball-on-socket implants.

Keywords

Composite disc substitute Lumbar spine finite element modelling Adjacent level effects Biomechanics Body weight 

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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • Jérôme Noailly
    • 1
  • Luigi Ambrosio
    • 3
  • K. Elizabeth Tanner
    • 4
  • Josep A. Planell
    • 1
    • 2
  • Damien Lacroix
    • 1
  1. 1.Institute for Bioengineering of Catalonia Biomechanics and MechanobiologyBarcelonaSpain
  2. 2.Department of Material Sciences and Metallurgical EngineeringTechnical University of CataloniaBarcelonaSpain
  3. 3.Institute of Composite and Biomedical MaterialsNational Research Council of ItalyNaplesItaly
  4. 4.School of EngineeringUniversity of GlasgowGlasgowScotland, UK

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