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Optical Sectioning and Visualization of the Intervertebral Disc from Embryonic Development to Degeneration
Published on: July 8, 2021
Spatially resolved streaming potentials of human intervertebral disk motion segments under dynamic axial compression
James C Iatridis1, Masaru Furukawa, Ian A F Stokes
1School of Engineering, Department of Orthopaedics and Rehabilitation, University of Vermont, 33 Colchester Avenue, Burlington, VT 05405, USA. james.iatridis@uvm.edu
Journal of Biomechanical Engineering
|January 22, 2009
Summary
This study measured streaming potentials in intervertebral discs under compression, finding they vary by location and frequency. These electrical potentials correlate with glycosaminoglycan content, offering insights into disc degeneration.
Area of Science:
- Biomedical Engineering
- Biomechanics
- Tissue Engineering
Background:
- Intervertebral disc degeneration alters mechanical, chemical, and electrical properties.
- Understanding these changes is crucial for developing effective treatments.
Purpose of the Study:
- To spatially map streaming potentials across intervertebral discs under cyclic loading.
- To investigate the relationship between streaming potentials, loading conditions, and tissue composition.
Main Methods:
- Human disc motion segments were subjected to cyclic axial compression.
- Spatially resolved streaming potentials were measured using micro-electrode arrays.
- Measurements were correlated with glycosaminoglycan content and loading parameters (frequency, amplitude).
Main Results:
- Normalized streaming potentials varied significantly with sagittal position and frequency.
- Higher frequencies showed peak potentials in the nucleus pulposus, while lower frequencies showed peaks in the annulus fibrosus.
- Significant correlations (R(2) 0.5-0.8) were found between streaming potentials and glycosaminoglycan content.
Conclusions:
- Streaming potential distribution is frequency-dependent, reflecting altered fluid and ion transport in degenerated discs.
- Results support the hypothesis that electrical potentials are linked to mechanical loading and tissue composition.
- This data aids in validating multiphasic models of intervertebral disc biomechanics.
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