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Six-Axis, Physiological Activity Profiles Create a More Challenging Cellular Environment in the Intervertebral Disc

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Simulating daily activities with six-axis loading in bioreactors challenges intervertebral disc (IVD) models, reducing cell viability. This highlights the need for realistic loading in IVD regenerative therapy development.

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biomechanicsbioreactorcell viabilitycomplex loadingintervertebral discphysiological loadingsix-axis loading

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Area of Science:

  • Biomedical Engineering
  • Regenerative Medicine
  • Biomechanics

Background:

  • Bioreactors are crucial for studying intervertebral disc (IVD) mechanics and biology.
  • Replicating real-world loading conditions in bioreactors remains a significant challenge for IVD research.

Purpose of the Study:

  • To develop population-based activity profiles using in vivo data for realistic IVD bioreactor loading.
  • To investigate the impact of six-axis loading on IVD cell viability.

Main Methods:

  • Combined time use surveys and six-axis in vivo load data to create activity profiles.
  • Utilized a novel six-axis bioreactor with whole-organ bovine tail IVD models.
  • Compared cell viability under six-axis loading versus single-axis or unloaded conditions.

Main Results:

  • Six-axis loading created a more demanding environment than single-axis or no loading.
  • Cell viability was reduced in both nucleus pulposus and annulus fibrosus under six-axis loading.
  • A more active lifestyle profile further decreased annulus fibrosus cell viability due to increased strains.

Conclusions:

  • Six-axis loading in bioreactors provides a more ecologically valid model for IVD research.
  • Realistic simulation of daily activities is essential for evaluating IVD therapies.
  • Findings emphasize the need to consider diverse activity levels for successful clinical translation of IVD interventions.