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Research Papers

Hybrid Rigid-Deformable Model for Prediction of Neighboring Intervertebral Disk Loads During Flexion Movement After Lumbar Interbody Fusion at L3–4 Level

[+] Author and Article Information
Tien Tuan Dao

Sorbonne University,
Université de Technologie de Compiègne,
CNRS, UMR 7338 Biomechanics
and Bioengineering,
Centre de Recherche Royallieu,
Compiègne CS 60 319, France
e-mail: tien-tuan.dao@utc.fr

1Corresponding author.

Manuscript received August 26, 2016; final manuscript received December 8, 2016; published online January 23, 2017. Assoc. Editor: James C. Iatridis.

J Biomech Eng 139(3), 031010 (Jan 23, 2017) (6 pages) Paper No: BIO-16-1356; doi: 10.1115/1.4035483 History: Received August 26, 2016; Revised December 08, 2016

Knowledge of spinal loads in neighboring disks after interbody fusion plays an important role in the clinical decision of this treatment as well as in the elucidation of its effect. However, controversial findings are still noted in the literature. Moreover, there are no existing models for efficient prediction of intervertebral disk stresses within annulus fibrosus (AF) and nucleus pulposus (NP) regions. In this present study, a new hybrid rigid-deformable modeling workflow was established to quantify the mechanical stress behaviors within AF and NP regions of the L1–2, L2–3, and L4–5 disks after interbody fusion at L3–4 level. The changes in spinal loads were compared with results of the intact model without interbody fusion. The fusion outcomes revealed maximal stress changes (10%) in AF region of L1–2 disk and in NP region of L2–3 disk. The minimal stress change (1%) is noted at the NP region of the L1–2 disk. The validation of simulation outcomes of fused and intact lumbar spine models against those of other computational models and in vivo measurements showed good agreements. Thus, this present study may be used as a novel design guideline for a specific implant and surgical scenario of the lumbar spine disorders.

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Figures

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Fig. 1

Hybrid rigid-deformable modeling workflow

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Fig. 2

Coupling of rigid osteoarticular model and deformable IVD model: whole osteoarticular model (a), lumbar spine model with elastic elements within IVD disks (b), lumbar spine model with interbody fusion at L3–4 level, and viscoelastic standard nonlinear solid (SNS) model (d)

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Fig. 3

Visualization of simulated 40-deg flexion movement of the lumbar spine within interbody fusion at L3–4 level

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Fig. 4

Spinal load change in neighboring disk L4–5 with fusion at disk L3–4

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Fig. 5

Spinal load change in neighboring disk L2–3 with fusion at disk L3–4

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Fig. 6

Spinal load change in neighboring disk L1–2 with fusion at disk L3–4

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