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Creep experimental study on the lumbar intervertebral disk under vibration compression load.

Xiuping Yang1,2, Xiaomin Cheng1,2, Yichao Luan1,2

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Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
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Summary

Vibration exposure significantly impacts lumbar intervertebral disc degeneration. This study reveals vibration frequency nonlinearly increases disc creep, modeled using a new constitutive equation for better prediction.

Keywords:
Intervertebral diskconstitutive modelcreepvibration load

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Area of Science:

  • Biomechanics
  • Biomaterials Science
  • Spinal Research

Background:

  • The intervertebral disc absorbs spinal loads but is susceptible to degeneration.
  • Vibration is a key factor contributing to intervertebral disc degeneration.
  • Understanding disc mechanics under vibration is crucial for spinal health.

Purpose of the Study:

  • To investigate the creep behavior of lumbar intervertebral discs under vibration compression.
  • To analyze the influence of vibration frequency and time on disc creep properties.
  • To develop and validate a constitutive model for predicting disc strain under vibration.

Main Methods:

  • Conducted creep experiments on sheep lumbar intervertebral discs under vibration compression.
  • Collected strain data over time under varying vibration frequencies and static loads.
  • Established a three-parameter solid creep constitutive model incorporating vibration factors.
  • Identified model parameters and compared predictions with experimental results.

Main Results:

  • Lumbar intervertebral disc strain shows an exponential time-dependent relationship.
  • Creep increases nonlinearly with vibration frequency at constant amplitude.
  • Vibration frequency significantly affects disc strain, especially at lower amplitudes.
  • Model predictions with time-varying parameters closely matched experimental data.

Conclusions:

  • Vibration frequency is a critical factor influencing intervertebral disc creep.
  • The developed constitutive model accurately predicts disc behavior under vibration.
  • Material properties within the model, elastic moduli and viscosity, change over time during creep.