Evaluation of a patient-specific finite element model to simulate conservative treatment in adolescent idiopathic scoliosis
TypeArticles dans des revues avec comité de lecture
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 geometries of ten patients before and during conservative treatment were reconstructed from bi-planar 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’ three-dimensional 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 6.4°. 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.
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VERGARI, Claudio; VERGARI, Claudio; ROUCH, Philippe; DUBOIS, Guillaume; BONNEAU, Dominique; DUBOUSSET, Jean; TANTER, Mickael; GENNISSON, Jean-Luc; SKALLI, Wafa (SAGE, 2014)Patient-specific numerical simulation of the spine is a useful tool both in clinic and research. While geometrical personalization of the spine is no more an issue, thanks to recent technological advances, non-invasive ...
3D reconstruction of ribcage geometry from biplanar radiographs using a statistical parametric model approach AUBERT, Benjamin; VERGARI, Claudio; ILHARREBORDE, B; COURVOISIER, A; SKALLI, Wafa (Taylor & Francis, 2014)Rib cage 3D reconstruction is an important prerequisite for thoracic spine modelling, particularly for studies of the deformed thorax in adolescent idiopathic scoliosis. This study proposes a new method for rib cage 3D ...
A novel method of anatomical landmark selection for rib cage 3D reconstruction from biplanar radiography VERGARI, Claudio; AUBERT, Benjamin; LALLEMANT-DUDEK, Pauline; HAEN, Thomas-Xavier; SKALLI, Wafa (Informa UK Limited, 2018-10-30)Methods to reconstruct anatomical structures in 3D are gaining interest in medicine because they give access to quantitative information on the patient’s geometry. However, these methods are user-dependent and require a ...
Lumbar annulus fibrosus biomechanical characterization in children by ultrasound shear wave elastography VERGARI, Claudio; DUBOIS, Guillaume; GENNISSON, Jean-Luc; TANTER, Mickael; DUBOUSSET, Jean; ROUCH, Philippe; SKALLI, Wafa; VIALLE, Raphael (Springer, 2016)Objectives Intervertebral disc (IVD) is key to spine biomechanics, and it is often involved in the cascade leading to spinal deformities such as idiopathic scoliosis, especially during the growth spurt. Recent progress in ...
Non-invasive biomechanical characterization of intervertebral discs by shear wave ultrasound elastography: a feasibility study VERGARI, Claudio; ROUCH, Philippe; DUBOIS, Guillaume; BONNEAU, Dominique; DUBOUSSET, Jean; TANTER, Mickael; GENNISSON, Jean-Luc (Springer, 2014)Objectives Although magnetic resonance is widely spread to assess qualitatively disc morphology, a simple method to determine reliably intervertebral disc status is still lacking. Shear wave elastography is a novel technique ...