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Related Experiment Video

Updated: Dec 30, 2025

Optical Sectioning and Visualization of the Intervertebral Disc from Embryonic Development to Degeneration
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Piezoelectricity in the Intervertebral disc.

Philip Poillot1, Joseph O'Donnell1, David T O'Connor1

  • 1Bernal Institute, University of Limerick, Ireland.

Journal of Biomechanics
|January 29, 2020
PubMed
Summary

This study reveals piezoelectricity in the intervertebral disc (IVD), specifically the Annulus Fibrosus (AF) and Nucleus Pulposus (NP). These findings highlight electro-mechanical coupling

Keywords:
Annulus FibrosusCollagenIntervertebral discMechanotransductionPiezoelectricity

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Area of Science:

  • Biophysics
  • Biomaterials Science
  • Spine Biomechanics

Background:

  • Lower back pain is a global health issue often linked to Intervertebral Disc (IVD) degeneration.
  • Mechanotransduction pathways, particularly electro-mechanical coupling, in loaded IVD tissue are not fully understood.
  • Piezoelectricity, a known factor in similar tissue remodeling, has been overlooked in IVD research.

Purpose of the Study:

  • To investigate the piezoelectric properties of the Annulus Fibrosus (AF) and Nucleus Pulposus (NP) within the IVD.
  • To measure the direct piezoelectric effect (mechanically-induced electrical potential) and inverse piezoelectric effect (electrically-induced deformation).
  • To explore the role of electro-mechanical coupling in IVD health and degeneration.

Main Methods:

  • Direct piezoelectric effect measurement: quantifying mechanically-induced electrical potential changes in AF and NP.
  • Inverse piezoelectric effect measurement: utilizing Piezoresponse Force Microscopy (PFM) to assess electrically-induced deformation.
  • In-vivo voltage calculation: estimating the local voltage generated by longitudinal piezoelectricity.

Main Results:

  • Demonstrated for the first time that piezoelectricity is generated throughout the entire IVD.
  • Observed greater piezoelectric effects in the AF compared to the NP, attributed to organized collagen networks.
  • Detected piezoelectric properties in the NP, suggesting contributions from unstudied non-collagenous proteins.
  • Calculated in-vivo longitudinal piezoelectricity to be approximately 1 nV locally.

Conclusions:

  • Highlighted a novel intricate electro-mechanical coupling within the IVD, with distinct roles in AF and NP.
  • Suggested that piezoelectric effects may influence cell alignment in the AF and interact with streaming potentials.
  • Emphasized the need for further research into cellular responses and the potential of piezoelectricity in IVD regeneration and degeneration prevention.