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Can variations in intervertebral disc height affect the mechanical function of the disc?
Y M Lu1, W C Hutton, V M Gharpuray
1Department of Bioengineering, Clemson University, South Carolina, USA.
Spine
|October 1, 1996
Summary
Altering lumbar spine disc height significantly impacts mechanical behavior, affecting axial displacement and disc bulge. These variations can influence research findings if not considered in biomechanical studies.
Area of Science:
- Biomechanics
- Spinal research
- Finite element analysis
Background:
- Intervertebral disc height is a variable parameter influenced by individual differences, spinal level, and medical conditions.
- Understanding disc height variations is crucial for accurate biomechanical analysis of the spine.
Purpose of the Study:
- To investigate the mechanical behavior of a human lumbar spine segment.
- To evaluate the effect of varying disc heights on axial displacement, intradiscal pressure, disc bulge, and stress distribution.
Main Methods:
- A 3D finite element model of the L2-L3 lumbar spine segment was developed.
- Parametric studies were conducted using three disc heights (8mm, 10mm, 12mm) while keeping other parameters constant.
- The model incorporated geometric nonlinearity with linear material properties.
Main Results:
- Disc height variations significantly influenced axial displacement, posterolateral disc bulge, and tensile stress in the anulus fibers.
- Intradiscal pressure and longitudinal stress at the endplate-vertebra interface showed minimal changes with altered disc height.
- The finite element method effectively simulated the biomechanical responses to changes in disc height.
Conclusions:
- Variations in intervertebral disc height can significantly affect biomechanical outcomes.
- Geometric parameters, particularly disc height, must be considered in experimental and analytical studies of the spine.
- Failure to account for disc height variations may lead to compromised or inaccurate research conclusions.