Evaluation of a patient-specific finite-element model to simulate conservative treatment in adolescent idiopathic scoliosis

Vergari, Claudio, Ribes, Gwenael, Aubert, Benjamin, Adam, Clayton, Miladi, Lotfi, Ilharreborde, Brice, Abelin-Genevois, Kariman, Rouch, Philippe, & Skalli, Wafa (2015) Evaluation of a patient-specific finite-element model to simulate conservative treatment in adolescent idiopathic scoliosis. Spine Deformity, 3(1), pp. 4-11.

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Abstract

Study design

Retrospective validation study.

Objectives

To propose a method to evaluate, from a clinical standpoint, the ability of a finite-element model (FEM) of the trunk to simulate orthotic correction of spinal deformity and to apply it to validate a previously described FEM.

Summary of background data

Several FEMs of the scoliotic spine have been described in the literature. These models can prove useful in understanding the mechanisms of scoliosis progression and in optimizing its treatment, but their validation has often been lacking or incomplete.

Methods

Three-dimensional (3D) geometries of 10 patients before and during conservative treatment were reconstructed from biplanar radiographs. The effect of bracing was simulated by modeling displacements induced by the brace pads. Simulated clinical indices (Cobb angle, T1–T12 and T4–T12 kyphosis, L1–L5 lordosis, apical vertebral rotation, torsion, rib hump) and vertebral orientations and positions were compared to those measured in the patients' 3D geometries.

Results

Errors in clinical indices were of the same order of magnitude as the uncertainties due to 3D reconstruction; for instance, Cobb angle was simulated with a root mean square error of 5.7°, and rib hump error was 5.6°. Vertebral orientation was simulated with a root mean square error of 4.8° and vertebral position with an error of 2.5 mm.

Conclusions

The methodology proposed here allowed in-depth evaluation of subject-specific simulations, confirming that FEMs of the trunk have the potential to accurately simulate brace action. These promising results provide a basis for ongoing 3D model development, toward the design of more efficient orthoses.

Impact and interest:

1 citations in Scopus
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ID Code: 85117
Item Type: Journal Article
Refereed: Yes
Keywords: scoliosis, bracing, orthotic, finite element, Brace; Adolescent idiopathic scoliosis; Simulation; 3D reconstruction; Biplanar radiography
DOI: 10.1016/j.jspd.2014.06.014
ISSN: 2212-134X
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > Institutes > Institute of Health and Biomedical Innovation
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2015 Elsevier
Copyright Statement: Licensed under the Creative Commons Attribution; Non-Commercial; No-Derivatives 4.0 International. DOI: 10.1016/j.jspd.2014.06.014
Deposited On: 06 Jul 2015 01:42
Last Modified: 21 Jul 2016 09:19

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