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Related Experiment Video

Updated: Jul 18, 2026

An Experimental and Finite Element Protocol to Investigate the Transport of Neutral and Charged Solutes across Articular Cartilage

An Experimental and Finite Element Protocol to Investigate the Transport of Neutral and Charged Solutes across Articular Cartilage

Published on: April 23, 2017

Anisotropic ion diffusivity in intervertebral disc: an electrical conductivity approach.

Alicia Jackson¹, Hai Yao, Mark D Brown

¹Tissue Biomechanics Lab, Department of Biomedical Engineering, University of Miami, Coral Gables, FL 33124-0621, USA.

|November 17, 2006

Summary

Investigating ion transport in the intervertebral disc, this study found that electrical conductivity and ion diffusivity in the anulus fibrosus are anisotropic, varying significantly by direction. These properties are crucial for understanding disc health and degeneration.

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Diffusion Imaging in the Rat Cervical Spinal Cord

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Diffusion Imaging in the Rat Cervical Spinal Cord

Diffusion Imaging in the Rat Cervical Spinal Cord

Published on: April 7, 2015

Area of Science:

Biomedical Engineering
Spinal Biomechanics
Physiology

Background:

Understanding small molecule diffusivity is key to intervertebral disc (IVD) nutrition and degeneration.
Limited data exists on the anisotropic ion diffusivity and electrical conductivity within the IVD.

Purpose of the Study:

To quantify the electrical conductivity and ion diffusivity of nucleus pulposus and anulus fibrosus.
To investigate these properties across three primary anatomical directions: axial, circumferential, and radial.

Main Methods:

Electrical conductivity measurements were performed on bovine coccygeal disc specimens (n=24 for anulus fibrosus and n=24 for nucleus pulposus).
Anisotropic conductivity was assessed in axial, radial, and circumferential directions for the anulus fibrosus.
Sodium (Na) and Chloride (Cl) ion diffusivities were estimated from conductivity data.

Main Results:

Nucleus pulposus exhibited significantly higher electrical conductivity (8.95 mS/cm) than the anulus fibrosus (4.70 mS/cm axial, 2.86 mS/cm radial, 4.38 mS/cm circumferential).
Anulus fibrosus demonstrated anisotropic conductivity, with significantly lower values in the radial direction compared to axial or circumferential.
Similar anisotropic trends were observed for Na and Cl ion diffusivities, both highly sensitive to water content.

Conclusions:

The electrical conductivity and ion diffusivity of the anulus fibrosus are direction-dependent (anisotropic).
These findings provide critical insights into transport mechanisms within the intervertebral disc.