scholarly journals The Effect of Muscle Direction on the Predictions of Finite Element Model of Human Lumbar Spine

2018 ◽  
Vol 2018 ◽  
pp. 1-6 ◽  
Author(s):  
Rui Zhu ◽  
Wen-xin Niu ◽  
Zhi-peng Wang ◽  
Xiao-long Pei ◽  
Bin He ◽  
...  
Keyword(s):  
Finite Element ◽  
Lumbar Spine ◽  
Finite Element Model ◽  
Element Model ◽  
Intradiscal Pressure ◽  
Erector Spinae ◽  
Rectus Abdominis Muscle ◽  
Oblique Direction ◽  
Erector Spinae Muscle ◽  
Human Lumbar Spine

The normal physiological loads from muscles experienced by the spine are largely unknown due to a lack of data. The aim of this study is to investigate the effects of varying muscle directions on the outcomes predicted from finite element models of human lumbar spine. A nonlinear finite element model of L3–L5 was employed. The force of the erector spinae muscle, the force of the rectus abdominis muscle, follower loads, and upper body weight were applied. The model was fixed in a neural standing position and the direction of the force of the erector spinae muscle and rectus abdominis muscle was varied in three directions. The intradiscal pressure, reaction moments, and intervertebral rotations were calculated. The intradiscal pressure of L4-L5 was 0.56–0.57 MPa, which agrees with the in vivo pressure of 0.5 MPa from the literatures. The models with the erector spinae muscle loaded in anterior-oblique direction showed the smallest reaction moments (less than 0.6 Nm) and intervertebral rotations of L3-L4 and L4-L5 (less than 0.2 degrees). In comparison with loading in the vertical direction and posterior-oblique direction, the erector spinae muscle loaded in the anterior-oblique direction required lower external force or moment to keep the lumbar spine in the neutral position.

A finite element model for predicting the biomechanical behaviour of the human lumbar spine

2002 ◽  
Vol 10 (1) ◽  
pp. 83-90 ◽  
Author(s):  
Tobias Pitzen ◽  
Fred Geisler ◽  
Dieter Matthis ◽  
Hans Müller-Storz ◽  
Dragos Barbier ◽  
...  
Keyword(s):  
Finite Element ◽  
Lumbar Spine ◽  
Finite Element Model ◽  
Element Model ◽  
Human Lumbar Spine

scholarly journals Biomechanics Of Human Lumbar Spine (L3 To L5) With Degenerative Disc Disease Using Finite Element Model

2019 ◽  
Vol 8 (6) ◽  
pp. 4609-4614
Keyword(s):  
Finite Element ◽  
Lumbar Spine ◽  
Finite Element Model ◽  
Disc Degeneration ◽  
Human Body ◽  
Lumbar Disc ◽  
Element Model ◽  
Human Spine ◽  
Human Lumbar Spine ◽  
Normal Human

Human spine is one of the complex structure of the human body. It provides the link between upper and lower extremities of the human body. It is estimated that at least 30% of people in the middle age group from thirty to fifty years have some degree of disc degeneration. Disc degeneration disease can affect the quality of life and in certain individual it can cause severe chronic pain if left untreated. The low back pain associated with lumbar disc degeneration is usually generated from two causes which are abnormal motion instability and inflammation. Abnormal motion instability occurs when the annulus fibrosus are worn down and cannot absorb stress on the human spine effectively resulting in changes in movements along the vertebral segment. To understand lumbar disc problem, a thorough knowledge of the biomechanics of the normal human lumbar spine and a disc degenerated lumbar spine is of great importance. In this study, Computed tomography image of a 33 year old male is used. A three dimensional (3D) human lumbar spine (L3 to L5) is created and validated with literature. The finite element model was modified to degenerated disc and studied the biomechanics of the lumbar spine. Comparison of the biomechanics of normal human lumbar spine is done with the human lumbar spine with disc degeneration for different range of motion and different loads. The result shows that the pressure generated on degenerated disc is greater than normal disc. This work can be implemented and used for designing implants and also for intervertebral disc related analysis

A Finite Element Model for Predicting the Biomechanical Behaviour of the Human Lumbar Spine

2000 ◽  
Vol 33 (3) ◽  
pp. 19-22
Author(s):  
Tobias Pitzen ◽  
Fred Geisler ◽  
Dieter Matthis ◽  
Hans Müller-Storz ◽  
Wolfhard Caspar ◽  
...  
Keyword(s):  
Finite Element ◽  
Lumbar Spine ◽  
Finite Element Model ◽  
Element Model ◽  
Human Lumbar Spine

Biomechanical Effect of Lumbar Disc Degeneration Under Flexion/Extension: A Finite Element Model Study

2007 ◽  
Author(s):  
Lissette M. Ruberté ◽  
Raghu Natarajan ◽  
Gunnar B. J. Andersson
Keyword(s):  
Finite Element ◽  
Lumbar Spine ◽  
Finite Element Model ◽  
Disc Degeneration ◽  
Pathological Condition ◽  
Lumbar Disc ◽  
Element Model ◽  
Adjacent Segment ◽  
Lumbar Disc Degeneration ◽  
Flexion Extension

Degenerative disc disease (DDD) is a progressive pathological condition observed in 60 to 80% of the population [1]. It involves changes in both the biochemistry and morphology of the intervertebral disc and is associated with chronic low back pain, sciatica and adult scoliosis [2,3]. The most accepted theory of the effects of DDD on the kinematics of the spine is that proposed by Kirkaldy-Willis and Farfan which states that the condition initiates as a temporary dysfunction, followed by instability and then re-stabilization as the disease progresses [4]. Although there is no clear relationship between disc degeneration and the mechanical behavior of the lumbar spine, abnormal motion patterns either in the form of increased motion or erratic motion have been reported from studies on human cadaveric motion segments [5,6]. To date however no study has looked at how disc degeneration affects the adjacent segment mechanics. IN vivo testing is difficult for these purposes given that specimens are generally obtained from people at the later stages of life and consequently often display multiple pathologies. A finite element model is a viable alternative to study the mechanics of the segments adjacent to the diseased disc. It is hypothesized that moderate degeneration at one level will alter the kinematics of the whole lumbar spine.

A FEM Model Analysis of Human Lumbar Spine With Bi-Level Artificial Disc Replacement

2006 ◽  
Author(s):  
A. Faizan ◽  
A. Kiapour ◽  
V. K. Goel ◽  
A. Ivanov ◽  
A. Biyani ◽  
...  
Keyword(s):  
Finite Element ◽  
Lumbar Spine ◽  
Bending Moment ◽  
Element Model ◽  
Good Alternative ◽  
Disc Replacement ◽  
Artificial Disc ◽  
Fem Model ◽  
Artificial Disc Replacement ◽  
Human Lumbar Spine

A finite element model of human lumbar spine (L3-S1 segment) was used to analyze biomechanical effects of the bi-level CHARITE artificial disc replacement (2LCHD) at L4-L5 and L5-S1 levels. The mechanical behavior and range of motion in implanted and intact models were compared using the finite element analyses and a hybrid loading protocol. In 2LCHD model the changes at L3-L4 level decreased by 25% also the model showed smooth changes in motion at implanted levels. In flexion there was an increase in facet loads at lower levels of 2LCHD however the bending moment in this model was less than intact model because of hybrid loading; in contrast, the facet loads in implanted model decreased in extension. It was observed that the bi-level disc replacement won’t affect much the kinematics of the spine and can be proposed as a good alternative for treatment in cases that disc degeneration occurs at more than one level of spine.

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