Moment–rotation responses of the human lumbosacral spinal column

Guan, Yabo; Yoganandan, Narayan; Moore, James S.; Pintar, Frank A.; Zhang, Jiangyue; Maiman, Dennis J.; Laud, Purushottam W.

doi:10.1016/j.jbiomech.2006.09.027

Cited by 95 publications

(73 citation statements)

References 25 publications

(37 reference statements)

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“…This constitutive model was chosen by several authors (Perez del Palomar et al 2008, Moramarco et al 2010) and validated against the literature (Brown et al 1957, Markolf and Morris 1974, Panjabi et al 1994, Guan et al 2007). The value of the coefficients C10, C20 (matrix material), Δ (compressibility modulus), K1 and K2 (fibres stiffness)…”

Section: Intervertebral Disc Constitutive Modelmentioning

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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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%

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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“…Moment-angle relations were investigated by Guan et al [11], Oxland et al [17], Panjabi et al [20] and Yamamoto et al [26]. Experiments to examine the influence of functional spinal structures have also been performed.…”

Section: Introductionmentioning

confidence: 99%

Intraoperative determination of the load–displacement behavior of scoliotic spinal motion segments: preliminary clinical results

et al. 2012

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Introduction Spinal fusion is a widely and successfully performed strategy for the treatment of spinal deformities and degenerative diseases. The general approach has been to stabilize the spine with implants so that a solid bony fusion between the vertebrae can develop. However, new implant designs have emerged that aim at preservation or restoration of the motion of the spinal segment. In addition to static, load sharing principles, these designs also require a profound knowledge of kinematic and dynamic properties to properly characterise the in vivo performance of the implants. Methods To address this, an apparatus was developed that enables the intraoperative determination of the loaddisplacement behavior of spinal motion segments. The apparatus consists of a sensor-equipped distractor to measure the applied force between the transverse processes, and an optoelectronic camera to track the motion of vertebrae and the distractor. In this intraoperative trial, measurements from two patients with adolescent idiopathic scoliosis with right thoracic curves were made at four motion segments each. Results At a lateral bending moment of 5 N m, the mean flexibility of all eight motion segments was 0.18 ± 0.08°/ N m on the convex side and 0.24 ± 0.11°/N m on the concave side. Discussion The results agree with published data obtained from cadaver studies with and without axial preload. Intraoperatively acquired data with this method may serve as an input for mathematical models and contribute to the development of new implants and treatment strategies.

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“…The lumbar part of the spinal column is mostly movable in the junction of the fifth lumbar vertebra and sacrum-extension movements in lumbar intervertebral joints are less intensive. Guan et al [23] found these structural and mechanical responses under relatively low load magnitudes (up to 4 Nm), close to physiologic load state. Anterior longitudinal ligament at the level of lumbosacral joint is softer than its superior counterparts in the lumbar spine [24].…”

Section: Discussionmentioning

confidence: 65%

Simon’s bleedings: a possible mechanism of appearance and forensic importance—a prospective autopsy study

et al. 2009

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Simon's bleedings are stripe-like hemorrhages on the ventral surface of the intervertebral disks of the lumbar part of the spinal column. The aims of this study were to determine the appearance frequency of Simon's bleedings in cases of hanging and in other cases of asphyxiations and to determine if the age of the deceased was in correlation with the occurrence of Simon's bleedings. A prospective autopsic study included 147 cases of hanging, 39 other asphyxiation deaths, and 461 deaths other than asphyxiation (blunt trauma, natural deaths, etc.). Simon's bleedings were present in 62.8% cases of hanging and in 61.5% cases of other types of asphyxiations. Simon's bleedings are not specific for hanging (chi (2) = 0.022, p > 0.05). Simon's bleedings were less frequent in other cases. It was established that the older the person was, the possibility of Simon's bleedings to occur would be less (Spearman's correlation coefficient = -0.225, p < 0.001; Wald coefficient = 29.798, p < 0.001). In the cases of hanging, there is statistically significant difference in average age between the groups with and without Simon's bleedings (t = 2.875, p = 0.017). The older the person was, the lower the likelihood of Simon's bleedings to occur: if the person was more than 60 years old, there was 70% probability of not having Simon's bleedings, and if older than 70, this probability would rise to 88% (Wald coefficient = 7.609, p = 0.021). In older persons who died due to hanging, throat skeleton fractures accompanied by local hemorrhage could be considered as a vital sign. In younger persons, where throat skeleton fractures are less frequent, Simon's bleedings could be the vital sign of premortem hanging. Simon's bleedings, in cases of asphyxiation, most likely occur due to agonal convulsions and forced movements in lumbosacral part of spinal column. Additional factor for the appearance of Simon's bleedings in hanging is traction of body and especially this part of spinal column due to gravity.

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Moment–rotation responses of the human lumbosacral spinal column

Cited by 95 publications

References 25 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

Intraoperative determination of the load–displacement behavior of scoliotic spinal motion segments: preliminary clinical results

Simon’s bleedings: a possible mechanism of appearance and forensic importance—a prospective autopsy study

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