Título:
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In silico evaluation of a new composite disc substitute with a L3-L5 lumbar spine finite element model
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Autor/a:
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Noailly, Jérôme; Ambrosio, Luigi; Tanner, K. Elizabeth; Planell Estany, Josep Anton; Lacroix, Damien Jerome
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Otros autores:
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Universitat Politècnica de Catalunya. Departament de Ciència dels Materials i Enginyeria Metal·lúrgica; Universitat Politècnica de Catalunya. BBT - Biomaterials, Biomecànica i Enginyeria de Teixits |
Abstract:
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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 displace-
ment-controlled rotations were simulated with and without
body weight applied. The original prototype reduced
greatly the flexibility of the treated segment with signifi-
cant 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 interseg-
mental 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 limi-
tation for the implant biomechanical and mechanobiolog-
ical functionality. In conclusion, numerical results given by
biomimetic composite disc substitutes were encouraging
with greater potential than that offered by ball-on-socket
implants |
Abstract:
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Peer Reviewed |
Materia(s):
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-Àrees temàtiques de la UPC::Enginyeria dels materials -Lumbar vertebrae -Finite element method -Elements finits, Mètode dels -Vèrtebres lumbars |
Derechos:
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Attribution-NonCommercial-NoDerivs 3.0 Spain
http://creativecommons.org/licenses/by-nc-nd/3.0/es/ |
Tipo de documento:
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Artículo - Versión publicada Artículo |
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