Heterogeneous meshing and biomechanical modeling of human spine

Teo, Jin Yao; Chui, Chee-Kong; Wang, Z. L.; Ong, Sim Heng; Yan, Chye Hwang; Wang, S. C.; Wong, Hee‐Kit; Teoh, Swee Hin

doi:10.1016/j.medengphy.2006.02.012

Cited by 29 publications

(14 citation statements)

References 31 publications

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“…Models derived from CT-scans or MR images generally require image segmentation, surface modelling and volume discretization, and are thus time consuming. A few automated mesh generation algorithms for CT-scans have been developed, such as landmark-based morphing [21], grid projection [8], [9], template-based generations [22], and voxel-based meshing [9], [23], [24]. Most studies usually concentrate on isolated vertebrae or spinal segments; furthermore, discs and ligaments are usually modelled during post-processing.…”

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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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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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“…The fibrose annulus is significantly affected by the amplitude and frequency of stress when a compressive load is applied (Iatridis et al [17], McNally, and Adams [18]). Due to this fact, research has been focused on studying the biomechanics of the intervertebral disc, using cadavers (McNally et al [19], Adams et al [20], and Adams et al [21]), animal models (Lotz et al [22], Lotz [5], Lotz et al [23], Larson et al [24]), and in vivo (Nachemson and Morris [25], Nachemson and Elfström [26]), applying different techniques, such as the finite element method (Edwards et al [27], Lee et al [28], Martinez et al [29], Schroeder et al [30], Teo et al [31], and Yin and Elliott [32]). Authors have shown different potentials on the overload that may cause disc protrusion (Adams and Hutton [33], McNally et al [34], Gordon et al [35]).…”

Section: Discussionmentioning

confidence: 99%

Photoelastic and Finite Element Stress Analysis of the Gap between the L4 and L5 Vertebrae

Fakhouri

Shimano

et al. 2011

ISRN Mechanical Engineering

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The purpose of this study was to analyze the stresses on the intervertebral disc between vertebrae L4 and L5 when a compressive load is applied on vertebra L4 using the photoelasticity transmission technique and the finite element method. Nine photoelastic models were used and were divided into three groups. Each group was formed by three models, according to the localization of the sagittal cut on vertebrae L4-L5. Simulation was carried out using a load of 23 N. The fringe orders were assessed by points close to the edge of the intervertebral disc using the Tardy compensation method. The analyses using the photoelasticity technique and the model of the finite elements showed that the stress generated by the vertebrae on the intervertebral disc was higher in the posterolateral region. Thus, this region is more susceptible to pathologies such as hernia and disc degeneration.

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“…Using COSMOSWorks software, the 3D model of the bone with soft tissues was converted into a surface triangle mesh, where the suitable value for the mesh size is 1.0 due to the complexity of the model. 8 The triangular mesh of the model was then converted into solid tetrahedrals, and static analysis was performed by applying moment at C1 as will be described in the next section.…”

Section: Fe Modelmentioning

confidence: 99%

Stability of cervical spine after one-level corpectomy using different numbers of screws and plate systems

Rosli

Kadir

Kamarul

2014

Proc Inst Mech Eng H

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Anterior corpectomy and reconstruction using a plate with locking screws are standard procedures for the treatment of cervical spondylotic myelopathy. Although adding more screws to the construct will normally result in improved fixation stability, several issues need to be considered. Past reports have suggested that increasing the number of screws can result in the increase in spinal rigidity, decreased spine mobility, loss of bone and, possibly, screw loosening. In order to overcome this, options to have constrained, semi-constrained or hybrid screw and plate systems were later introduced. The purpose of this study is to compare the stability achieved by four and two screws using different plate systems after one-level corpectomy with placement of cage. A three-dimensional finite-element model of an intact C1-C7 segment was developed from computer tomography data sets, including the cortical bone, soft tissue and simulated corpectomy fusion at C4-C5. A spinal cage and an anterior cervical plate with different numbers of screws and plate systems were constructed to a fit one-level corpectomy of C5. Moment load of 1.0 N m was applied to the superior surface of C1, with C7 was fixed in all degrees of freedom. The kinematic stability of a two-screw plate was found to be statistically equivalent to a four-screw plate for one-level corpectomy. Thus, it can be a better option of fusion and infers comparable stability after one-level anterior cervical corpectomy, instead of a four-screw plate.

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Heterogeneous meshing and biomechanical modeling of human spine

Cited by 29 publications

References 31 publications

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

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

Photoelastic and Finite Element Stress Analysis of the Gap between the L4 and L5 Vertebrae

Stability of cervical spine after one-level corpectomy using different numbers of screws and plate systems

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