Mechanics Characteristic Research of Human Lumbar Spine Based on the Changed Gradient for 3-D Printer

2014 ◽  
Vol 988 ◽  
pp. 449-452
Author(s):  
Bo Zhang ◽  
Heng Zhi Cai ◽  
Gang Zhou ◽  
Ya Jun Zhang ◽  
Jian Zhuang
Keyword(s):  
Lumbar Spine ◽  
Intervertebral Disc ◽  
Material Properties ◽  
Geometric Model ◽  
Three Dimensional ◽  
Artificial Joint ◽  
Human Lumbar Spine ◽  
Mechanics Characteristic ◽  
Spine Model ◽  
Gradient Change

According to the spinal anatomy data, three-dimensional geometric model of human lumbar spine L3-L5 segment is established in this paper. In the model, the vertebra is divided into cortical bone, cancellous bone, endplate and other structures. The connection between the vertebrae and intervertebral disc is simulated as contact joint. The material properties of lumbar parts of the structure are not the same, the elastic modulus is changing in the analysis. Based on the model, the deformation of the lumbar spine under different size of axial force and lateral torque is simulated. The simulation result shows the variation regularity of the deformation of vertebrae and intervertebral disc under the condition of different pressure. This research provides a quantitative reference for spinal bio-mechanics. The human spine model with a gradient change sets the foundation for processing field of artificial joint using the 3D printing technology.

Experimentally Validated Computational Simulation of Lumbar Spine Intervertebral Disc Puncture

2011 ◽  
Author(s):  
Kristen E. Lipscomb ◽  
Nesrin Sarigul-Klijn
Keyword(s):  
Back Pain ◽  
Lumbar Spine ◽  
Intervertebral Disc ◽  
Nucleus Pulposus ◽  
Chronic Back Pain ◽  
Medical Condition ◽  
Computational Simulation ◽  
Element Model ◽  
Before And After ◽  
Spine Model

Back pain is a debilitating medical condition, often with an unclear source. Over time, back pain can affect the work and lifestyle of an individual by reducing job productivity and time spent on enjoyable activities. Discography of the intervertebral disc (IVD) is often used to diagnose pathology of the disc and determine if it may be a source for chronic back pain. It has recently been suggested that discography may lead to IVD degeneration, and has been a cause of controversy among spine care physicians. Using the results from a cadaveric experimental model, a finite element model was first validated. Then, a study was conducted to better understand the changes caused by discography on human spine mechanics. An anatomically accurate L3-L5 lumbar spine model was developed using computed tomography scans. Discography was simulated in the model as an area in the disc affected by needle puncture. The material properties in the nucleus pulposus were adjusted to match experimental data both before and after puncture. The results show that puncture of the IVD leads to increased deformation as well as increased stresses in the disc. Pressure in the nucleus pulposus found to decrease after puncture, and was calculated in the course of this study. Puncturing the IVD changes disc mechanics and may lead to progressive spine issues in the future such as disc degeneration. While discography has been the gold standard to determine if the disc was a source of back pain in patients for many years, the potential long-term degenerative effects of the procedure are only now coming into light, and must be closely examined.

A Method of Analyzing the Three-Dimensional Stiffness Properties of the Intact Human Lumbar Spine

1981 ◽  
Vol 103 (4) ◽  
pp. 299-300 ◽  
Author(s):  
J. M. Laborde ◽  
A. H. Burstein ◽  
K. Song ◽  
R. H. Brown ◽  
E. Bahniuk
Keyword(s):  
Lumbar Spine ◽  
Three Dimensional ◽  
Stiffness Properties ◽  
Human Lumbar Spine

Intervertebral Disc Shape Variation and its Relationship to Degeneration Using Principal Components Analysis of a Population of MR Images

2012 ◽  
Author(s):  
John M. Peloquin ◽  
Jonathon H. Yoder ◽  
Nathan T. Jacobs ◽  
Sung M. Moon ◽  
Alexander C. Wright ◽  
...  
Keyword(s):  
Stress Distribution ◽  
Intervertebral Disc ◽  
Material Properties ◽  
Three Dimensional ◽  
Low Back ◽  
Shape Variation ◽  
Mr Images ◽  
Physiological Basis ◽  
Prevalent Disease ◽  
Components Analysis

Degeneration of the intervertebral disc (IVD) is implicated in low back pain, which is a costly and prevalent disease. Since the IVD is a mechanically active organ, it is important to consider its mechanical behavior as one factor in the degenerate pathology. Strain can be measured directly by imaging methods, but the stress distribution within the disc must be calculated. The stress distribution for a particular strain state is dependent on the IVD’s material properties and its geometry. While the material properties of the tissues comprising IVD have been extensively studied, its three-dimensional geometry remains incompletely characterized. Prior whole-disc models have been constructed from single IVDs. While this approach ensures that the geometry has a physiological basis, it is uncertain the degree to which results from a single IVD shape can be generalized to the entire population.

Corrigendum to “The in vivo three-dimensional motion of the human lumbar spine during gait” [Gait & Posture (2008) 378–384]

2009 ◽  
Vol 29 (1) ◽  
pp. 165 ◽  
Author(s):  
Adam Rozumalski ◽  
Michael H. Schwartz ◽  
Roy Wervey ◽  
Andrew Swanson ◽  
Daryll C. Dykes ◽  
...  
Keyword(s):  
Lumbar Spine ◽  
Three Dimensional ◽  
Human Lumbar Spine ◽  
Gait Posture

The in vivo three-dimensional motion of the human lumbar spine during gait

2008 ◽  
Vol 28 (3) ◽  
pp. 378-384 ◽  
Author(s):  
Adam Rozumalski ◽  
Michael H. Schwartz ◽  
Roy Wervey ◽  
Andrew Swanson ◽  
Daryll C. Dykes ◽  
...  
Keyword(s):  
Lumbar Spine ◽  
Three Dimensional ◽  
Human Lumbar Spine
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