On the collagen criss-cross angles in the annuli fibrosi of lumbar spine finite element models
Visualitza/Obre
fulltext.pdf (1,381Mb) (Accés restringit)
Sol·licita una còpia a l'autor
Què és aquest botó?
Aquest botó permet demanar una còpia d'un document restringit a l'autor. Es mostra quan:
- Disposem del correu electrònic de l'autor
- El document té una mida inferior a 20 Mb
- Es tracta d'un document d'accés restringit per decisió de l'autor o d'un document d'accés restringit per política de l'editorial
Cita com:
hdl:2117/12648
Tipus de documentArticle
Data publicació2011-04
Condicions d'accésAccés restringit per política de l'editorial
Llevat que s'hi indiqui el contrari, els
continguts d'aquesta obra estan subjectes a la llicència de Creative Commons
:
Reconeixement-NoComercial-SenseObraDerivada 3.0 Espanya
Abstract
In the human lumbar spine, annulus fibrosus
fibres largely contribute to intervertebral disc stability.
Detailed annulus models are therefore necessary to obtain reliable predictions of lumbar spine mechanics by finite element
modelling. However, different definitions of collagen orientations coexist in the literature for healthy human lumbar annuli. Therefore, four annulus fibre-induced anisotropy models were built from reported anatomical descriptions, and inserted in a L3–L5 lumbar bi-segment finite element
model. Annulus models were, respectively, characterized by radial, tangential, radial and tangential, and no fibre orientation
gradients. The effect of rotational and axial compressive loadings was simulated and first, predictions were compared to experimental data. Then, intervertebral disc
local biomechanics was studied under axial rotation and axial compression. A new parameter, i.e. the fibre contribution
quality parameter, was computed in the anterior, lateral, postero-lateral, and posterior annuli of each model, in function
of fibre stresses, radial load distributions, and matrix shear strains. Locally, each annulus model behaved differently, affecting intervertebral disc biomechanics and segmentalmotions.
The fibre contribution quality parameter allowed establishing direct links between local annulus fibre organization and local annulus loadings, while other kinematical
and biomechanical data did not. It was concluded that functional relations should exist between local annulus fibre orientations and overall segment morphology. The proposed fibre contribution quality parameter could be used to examine
such relations and calibrate lumbar spine finite element models by locally adjusting the annulus bundle criss-cross angles. Conclusions of this study are particularly relevant to patient-specific models or artificial disc designs.
CitacióNoailly, J.; Planell, J.; Lacroix, D. On the collagen criss-cross angles in the annuli fibrosi of lumbar spine finite element models. "Biomechanics and modeling in mechanobiology", Abril 2011, vol. 10, núm. 2, p. 203-219.
ISSN1617-7959
Versió de l'editorhttp://www.springerlink.com/index/9054452316271L1J.pdf
Fitxers | Descripció | Mida | Format | Visualitza |
---|---|---|---|---|
fulltext.pdf | 1,381Mb | Accés restringit |