Biomechanical modeling of the lateral decubitus posture during corrective scoliosis surgery

Lalonde, Nadine; Villemure, Isabelle; Pannetier, Romain; Parent, Stefan; Aubin, Carl‐Éric

doi:10.1016/j.clinbiomech.2010.03.009

Cited by 20 publications

(10 citation statements)

References 31 publications

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“…Stress acquisition over these zones was initially performed on the normal FEM and the non-instrumented scoliotic FEMs to collect stress profiles from which to compare the stress manipulative ability of the explored implants. Scoliotic FEM was then alternatively introduced with implants prior to initiation of loading in order to simulate the pre-operative curve reduction obtained in a clinical setting during the lateral decubitus patient positioning [13]. As a result, the scoliotic FEM was instrumented while under a thoracic Cobb angle of 168 (43% reduction over loaded non-instrumented scoliotic model).…”

Section: Methodsmentioning

confidence: 99%

Biomechanical comparison of fusionless growth modulation corrective techniques in pediatric scoliosis

Driscoll

Aubin

Moreau

et al. 2011

Med Biol Eng Comput

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Fusionless growth-sparing implants for the treatment of adolescent idiopathic scoliosis (AIS) attempt to manipulate vertebral growth to restore spinal alignment. This study critically explores different implants utilizing a human spine scoliotic finite element model (FEM). Stainless steel (SS) and shape memory alloy (SMA) staples and flexible tethers were modeled and alternatively integrated around the apex of the convexity of the scoliotic model. Stress profiles over vertebral growth plates were obtained. Two years of growth was simulated with non-instrumented and instrumented models, as curvature changes were quantified. Apical asymmetrical stresses in non-instrumented and instrumented scoliotic models with SS staple, flexible tether, and SMA staple were 0.48, 0.48, 0.23, and 0.33 MPa, respectively. Patient data and non-instrumented model progressed from 28° to 62° of thoracic Cobb angle over 2 years. Simulated projected long-term thoracic Cobb angles of instrumented models are 31° with SS staple, 31° with flexible tether, and 34° with SMA staple. Initial implant compression achieved during instrumentation provided a significant influence on initial and long-term spinal profiles. The developed FEM provides an effective platform with which to explore, critique, and enhance fusionless growth-sparing techniques.

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Section: Methodsmentioning

confidence: 99%

Biomechanical comparison of fusionless growth modulation corrective techniques in pediatric scoliosis

Driscoll

Aubin

Moreau

et al. 2011

Med Biol Eng Comput

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“…Continuum models comprise automated CT voxel -based meshes [17] and meshes generated from stereoradiographic 3D reconstructed points or CT/MR contours [5], [12], [13], [19], [20]. Models derived from CT-scans or MR images generally require image segmentation, surface modelling and volume discretization, and are thus time consuming.…”

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confidence: 99%

Method to Geometrically Personalize a Detailed Finite-Element Model of the Spine

Lalonde

Petit

Cé

et al. 2013

IEEE Trans. Biomed. Eng.

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This article has been accepted for publication in a future issue of this journal, but has not been fully edited. Content may change prior to final publication. TBME-01357-2012.R2Abstract-To date, developing geometrically personalized and detailed solid finite element models of the spine remains a challenge, notably due to multiple articulations and complex geometries. To answer this problem, a methodology based on a free form deformation technique (kriging) was developed to deform a detailed reference finite element mesh of the spine (including discs and ligaments) to the patient-specific geometry of 10 and 82-year old asymptomatic spines. Different kriging configurations were tested: with or without smoothing, and control points on or surrounding the entire mesh. Based on the results, it is recommended to use surrounding control points and smoothing. The mean node to surface distance between the deformed and target geometries was 0.3 mm ± ± ± ± 1.1. Most elements met the mesh quality criteria (95%) after deformation, without interference at the articular facets. The method's novelty lies in the deformation of the entire spine at once, as opposed to deforming each vertebra separately, with surrounding control points and smoothing. This enables the transformation of reference vertebrae and soft tissues to obtain complete and personalized FEMs of the spine with minimal post-processing to optimize the mesh.

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“…Recent publications described a method to develop personalized finite element models of the spine toward a patient-specific scoliosis (Lalonde et al, 2010). In this study, the change in the spine was applied in three-steps using different set of vertebrae constraints and prescribed accelerations on the whole spine.…”

Section: Discussionmentioning

confidence: 99%

Development of a computational framework to adjust the pre-impact spine posture of a whole-body model based on cadaver tests data

Poulard

Subit

Donlon

et al. 2015

Journal of Biomechanics

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Biomechanical modeling of the lateral decubitus posture during corrective scoliosis surgery

Cited by 20 publications

References 31 publications

Biomechanical comparison of fusionless growth modulation corrective techniques in pediatric scoliosis

Biomechanical comparison of fusionless growth modulation corrective techniques in pediatric scoliosis

Method to Geometrically Personalize a Detailed Finite-Element Model of the Spine

Development of a computational framework to adjust the pre-impact spine posture of a whole-body model based on cadaver tests data

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