Validation of a clinical finite element model of the human lumbosacral spine

Guan, Yabo; Yoganandan, Narayan; Zhang, Jiangyue; Pintar, Frank A.; Cusick, Joesph F.; Wolfla, Christopher E.; Maiman, Dennis J.

doi:10.1007/s11517-006-0066-9

Cited by 73 publications

(38 citation statements)

References 50 publications

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“…18,22,37,41,47,55 To measure the deviation of our model from the SD corridors we have introduced percent of load range deviation to show the amount of the loading range in which the model is within the corridors. It is apparent from Figs.…”

Section: Discussionmentioning

confidence: 99%

Validation of a Finite Element Model of the Young Normal Lower Cervical Spine

et al. 2008

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A Finite Element Model (FEM) of the young adult human cervical spine has been developed as a first step in studying the process of spondylotic degeneration. The model was developed using normal geometry and material properties for the lower cervical spine. The model used a three-zone composite disc annulus to reflect the different material properties of the anterior, posterior, and lateral regions of the annulus. Nonlinear ligaments were implemented with a toe region to help the model achieve greater flexibility at low loads. The model was validated against experimental data for normal, nondegenerated cervical spines tested in flexion and extension, right and left lateral bending, and right and left axial rotation at loads of 0.33, 0.5, 1.0, 1.5, and 2.0 Nm. The model was within in vitro experimental standard deviation corridors 100% of the load range for right and left lateral bending. The model was within 80% of the load response corridors for extension and flexion with a deviation <0.3 degrees from the SD corridors. For axial rotation, the model was within 70% of the SD corridors for left axial rotation within 83% of right axial rotation responses. The deviation from SD corridors for axial rotation was generally <0.2 degrees.

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Section: Discussionmentioning

confidence: 99%

Validation of a Finite Element Model of the Young Normal Lower Cervical Spine

et al. 2008

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“…The anulus fibrosis of the intervertebral disk was assumed to follow an isotropic hypoelastic law [9]. The polynomial form of strain energy potential was chosen from the ABA-QUS material library.…”

Section: Materials Propertiesmentioning

confidence: 99%

Analysis of biomechanical changes after removal of instrumentation in lumbar arthrodesis by finite element analysis

Kim

Chun

Moon

et al. 2010

Med Biol Eng Comput

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The purpose of this study is to investigate the change in biomechanical milieu following removal of pedicle screws in instrumented single level lumbar arthrodesis. Using a validated finite element (FE) model of the intact lumbar spine (L2-5), two scenarios of L3-4 lumbar fusion were simulated: posterolateral fusion (PLF) at L3-4 using pedicle screws (PLF with pedicle screws; WiP) and L3-4 lumbar posterolateral fusion state after removal of pedicle screws (PLF without pedicle screws; WoP). The WiP model had greater range of motion (ROM) at each adjacent segment than the WoP model. This phenomenon became pronounced at the proximal adjacent segment under flexion moment. Similarly, removal of pedicle screws (the WoP model) relieved the maximal von Mises stress at adjacent segments under 4 moments compared to the WiP model. This study demonstrated that removal of pedicle screws could decrease stiffness of fusion segments, which would reduce the disk stress of adjacent segments.

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“…Computational and finite element models have been developed in previous studies, to simulate varying levels of complexity in the spinal geometry-from individual intervertebral discs [8] and spinal motion segments [9,10,14,21] to whole spine osseous/osseoligamentous models [2,6,11,15]. Increasingly, it is becoming desirable to base these models on patient specific rather than average or idealized data, in order to simulate the specific response of a patient's spinal anatomy to surgical procedures [3,5,6,11,12,15]. Thus, in this study of cadaveric specimens, subject specific geometry for the intervertebral disc was obtained.…”

Section: Discussionmentioning

confidence: 99%

Parametric equations to represent the profile of the human intervertebral disc in the transverse plane

2007

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Computational and finite element models of the spine are used to investigate spine and disc mechanics. Subject specific data for the transverse profile of the disc could improve the geometric accuracy of these models. The current study aimed to develop a mathematical algorithm to describe the profile of the disc components, using subject-specific data points. Using data points measured from pictures of human intervertebral discs sectioned in the transverse plane, parametric formulae were derived that mapped the outer profile of the anulus and nucleus. The computed anulus and nucleus profile were a similar shape to the discs from which they were derived. The computed total disc area was similar to the experimental data. The nucleus:disc area ratios were sensitive to the data points defined for each disc. The developed formulae can be easily implemented to provide patient specific data for the disc profile in computational models of the spine.

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Validation of a clinical finite element model of the human lumbosacral spine

Cited by 73 publications

References 50 publications

Validation of a Finite Element Model of the Young Normal Lower Cervical Spine

Validation of a Finite Element Model of the Young Normal Lower Cervical Spine

Analysis of biomechanical changes after removal of instrumentation in lumbar arthrodesis by finite element analysis

Parametric equations to represent the profile of the human intervertebral disc in the transverse plane

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