Mechanical analysis of the lumbar vertebrae in a three-dimensional finite element method model in which intradiscal pressure in the nucleus pulposus was used to establish the model

Goto, Keisuke; Tajima, Naoya; Chosa, Etsuo; Totoribe, Koji; Kuroki, Hiroshi; Arizumi, Yuichi; Arai, Takashi

doi:10.1007/s007760200040

Cited by 67 publications

(53 citation statements)

References 8 publications

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“…While linear elastic isotropic models of the disc are available for µFE studies (Homminga et al 2004, Eswaran et al 2006, Fields et al 2010, two methods are commonly used to model the anisotropy of the annulus in hFE models: explicit representation of the collagen fibres by bar elements embedded in a matrix (Goto et al 2002, Dreischarf et al 2011 homogenized hyperelastic constitutive law of the matrix and fibres. This option, developed by Holzapfel and Gasser (2000) to model arteries, was adapted to the annulus fibrosus (Eberlein et al 2001, Eberlein et al 2004).…”

Section: Intervertebral Disc Constitutive Modelmentioning

confidence: 99%

“…The dimensions of the intervertebral disc are usually taken from measurements (Schroeder et al 2006, Shirazi-Adl et al 2010), MRI (Périé et al 2001 or QCT data (Ayturk et al 2010, Moramarco et al 2010, Homminga et al 2011) assuming the volume of the nucleus and its positioning within the disc (Jones and Wilcox 2008). Thus, a height of 5 mm was used for the two half-intervertebral discs (Amonoo-Kuofi 1991, Inoue et al 1999) and a volumetric ratio of 42% between nucleus pulposus and annulus fibrosus chosen (Goto et al 2002, Moramarco et al 2010. The cranial and caudal midsurfaces of the discs were chosen flat (Jones and Wilcox 2008).…”

Section: Mesh Generationmentioning

confidence: 99%

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Embedding of human vertebral bodies leads to higher ultimate load and altered damage localisation under axial compression

Maquer

Schwiedrzik

Zysset

2012

Computer Methods in Biomechanics and Biomedical Engineering

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Embedding of human vertebral bodies leads to higher ultimate load and altered damage localisation under axial compressionComputer tomography (CT-) based finite element (FE) models of vertebral bodies assess fracture load in vitro better than DXA, but boundary conditions affect stress distribution under the endplates that may influence ultimate load and damage localization under postyield strains. Therefore, HRpQCT-based homogenized FE models of 12 vertebral bodies were subjected to axial compression with two distinct boundary conditions: embedding in polymethylmethalcrylate (PMMA) and bonding to a healthy intervertebral disc (IVD) with distinct hyperelastic properties for nucleus and annulus. Bone volume fraction and fabric assessed from HRpQCT data were used to determine the elastic, plastic and damage behaviour of bone. Ultimate forces obtained with PMMA were 22% higher than with IVD but correlated highly (R 2 =0.99). At ultimate force, distinct fractions of damage were computed in the endplates (PMMA: 6%, IVD: 70%), cortex and trabecular subregions, which confirms previous observations that in contrast to PMMA embedding, failure initiated underneath the nuclei in healthy IVDs. In conclusion, axial loading of vertebral bodies via PMMA embedding versus healthy IVD overestimates ultimate load and leads to distinct damage localization and failure pattern.

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Section: Intervertebral Disc Constitutive Modelmentioning

confidence: 99%

Section: Mesh Generationmentioning

confidence: 99%

Embedding of human vertebral bodies leads to higher ultimate load and altered damage localisation under axial compression

Maquer

Schwiedrzik

Zysset

2012

Computer Methods in Biomechanics and Biomedical Engineering

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“…As regards the ipolordotic model, stresses on facets appear in every zone of the spine lower than in the other two models. Results have been compared and validated with results obtained by Goto et al [43] as regards a physiological model of a L4-L5 functional spinal unit.…”

Section: Resultsmentioning

confidence: 93%

Biomechanical consideration for dorsal-lumbar and lumbar sagittal spine disorders

Bignardi

Ramieri

Costanzo

2009

Modelling in Medicine and Biology VIII

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Lower back pain is one of the most important socioeconomic diseases and one of the most important health care issues today. On average, 50-90% of the adult population suffers from lower back pain and lifetime prevalence of lower back pain is 65-80%. The causes of lower back pain often remain unclear and may vary from patient to patient. It is estimated that 75% of such cases are associated disorders of the rachis mean back (kyphosis) or front (lordosis) pathological deviations, irreducible in various measures, resulting from structural diskligament and vertebral alterations of various etiologies. Three numerical models of the dorsal-lumbar spine, respectively a physiological model, a ipolordotic model and a kyphotic model, have been realized considering bone, disks and ligaments with their specific mechanical characteristics. For the load and boundary conditions chosen, joint facets and intervertebral disk stresses and disk bulge have been compared for the three spine situations. When it has been possible, the obtained results have been validated with data available in literature regarding both experimental and computational studies. In conclusion it can be assumed that dorsal-lumbar and lumbar sagittal spine disorders can determine premature disks and joints alterations. In particular, it seems that dorsal-lumbar kyphosis, more than lumbar ipolordosis, can expose joint facets and disks to non physiological loads. In addition, if the genetic role of disk degeneration is acknowledged, it is probable that the correction, at a precocious age, of sagittal spine imbalance, can prevent or slacken the disk-joint lumbar-sacral degenerative phenomena. The obtained results agree with the clinical experience.

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“…Additional studies have reported disc response and/ or loads for the lumbar spine associated with lateral postures, such as flexion-extension (Rx), [1,16,19] forward-backward translation (Tz), [32,33] and vertical translation (Ty) [13,50].…”

Section: Discussionmentioning

confidence: 99%

Validation of a computer analysis to determine 3-D rotations and translations of the rib cage in upright posture from three 2-D digital images

Harrison

Janik²,

Cailliet

et al. 2006

Eur Spine J

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IntroductionHuman thoracic cage posture has been of interest since ancient times, especially deformities of the rib cage [20,25,35,36,45]. In his classic texts, Breig [8][9][10] showed that human postures can cause adverse mechanical tension on the central nervous system, thus correlating abnormal posture with disease. During the past century, thoracic posture (axial translation) has been associated with the treatment of disc degeneration and prolapse [13,37,50]. Abstract Since thoracic cage posture affects lumbar spine coupling and loads on the spinal tissues and extremities, a scientific analysis of upright posture is needed. Common posture analyzers measure human posture as displacements from a plumb line, while the PosturePrintä claims to measure head, rib cage, and pelvic postures as rotations and translations. In this study, it was decided to evaluate the validity of the PosturePrintä Internet computer system's analysis of thoracic cage postures. In a university biomechanics laboratory, photographs of a mannequin thoracic cage were obtained in different postures on a stand in front of a digital camera. For each mannequin posture, three photographs were obtained (left lateral, right lateral, and AP). The mannequin thoracic cage was placed in 68 different single and combined postures (requiring 204 photographs) in five degrees of freedom: lateral translation (Tx), lateral flexion (Rz), axial rotation (Ry), flexion-extension (Rx), and anteriorposterior translation (Tz). The PosturePrintä system requires 13 reflective markers to be placed on the subject (mannequin) during photography and 16 additional ''click-on'' markers via computer mouse before a set of three photographs is analyzed by the PosturePrintä computer system over the Internet. Errors were the differences between the positioned mannequin and the calculated positions from the computer system. Average absolute value errors were obtained by comparing the exact inputted posture to the PosturePrintä's computed values. Mean and standard deviation of computational errors for sagittal displacements of the thoracic cage were Rx=0.3±0.1°, Tz=1.6±0.7 mm, and for frontal view displacements were Ry=1.2±1.0°, Rz=0.6±0.4°, and Tx=1.5±0.6 mm. The PosturePrintä system is sufficiently accurate in measuring thoracic cage postures in five degrees of freedom on a mannequin indicating the need for a further study on human subjects.

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Mechanical analysis of the lumbar vertebrae in a three-dimensional finite element method model in which intradiscal pressure in the nucleus pulposus was used to establish the model

Cited by 67 publications

References 8 publications

Embedding of human vertebral bodies leads to higher ultimate load and altered damage localisation under axial compression

Embedding of human vertebral bodies leads to higher ultimate load and altered damage localisation under axial compression

Biomechanical consideration for dorsal-lumbar and lumbar sagittal spine disorders

Validation of a computer analysis to determine 3-D rotations and translations of the rib cage in upright posture from three 2-D digital images

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