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The internal mechanics of the intervertebral disc under cyclic loading
P E Riches1, N Dhillon, J Lotz
1School of Mathematics, University of Bristol, Bristol, UK. philip.riches@strath.ac.uk
Journal of Biomechanics
|August 7, 2002
Summary
This study models intervertebral disc (IVD) mechanics under cyclic loading using poroelasticity. The model accurately predicts experimental data, validating its parameters for IVD behavior.
Area of Science:
- Biomechanics
- Biomedical Engineering
- Materials Science
Background:
- The intervertebral disc (IVD) is crucial for spinal mechanics.
- Understanding IVD behavior under load is vital for treating back pain.
- Poroelastic models offer a framework for IVD mechanical analysis.
Purpose of the Study:
- To investigate intervertebral disc (IVD) mechanics under cyclic loading.
- To develop and validate a one-dimensional poroelastic model for IVD behavior.
- To determine key poroelastic parameters of the IVD.
Main Methods:
- A one-dimensional poroelastic model based on Biot's theory was employed.
- The model incorporated power-law and linear relationships for porosity/permeability and osmotic potential/solidity.
- Experimental data from unconfined IVD cyclic compression and expansion was used for model fitting.
Main Results:
- The poroelastic model was successfully fitted to experimental IVD data after accounting for initial elastic deformation.
- Best-fit parameters for aggregate modulus (H(A)) and initial permeability (k(i)) were determined.
- Obtained parameters aligned well with existing literature values, especially under high-stress conditions.
Conclusions:
- The developed poroelastic model provides a robust method for analyzing IVD mechanics.
- The study successfully determined critical poroelastic parameters (H(A), k(i)) for the IVD.
- Findings contribute to a better understanding of IVD response to mechanical loading.