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Related Experiment Videos

Intervertebral disc response to cyclic loading--an animal model

L Ekström1, A Kaigle, E Hult

  • 1Department of Orthopaedics, Göteborg University, Sahlgrenska University Hospital, Sweden.

Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
|January 1, 1996
PubMed
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This study investigated the viscoelastic response of lumbar spine segments under cyclic loading. A four-parameter fluid model better predicted progressive deformation compared to a three-parameter solid model, indicating cyclic loading effects.

Area of Science:

  • Biomechanics
  • Spinal Mechanics
  • Viscoelasticity

Background:

  • Understanding the viscoelastic response of lumbar motion segments is crucial for spinal health.
  • Cyclic loading can induce complex deformations not fully captured by simpler models.

Purpose of the Study:

  • To evaluate the viscoelastic behavior of lumbar motion segments under cyclic compression.
  • To compare the predictive accuracy of a standard linear solid model and a linear Burger's fluid model.

Main Methods:

  • In vivo porcine model (N=7) with a servohydraulic exciter attached to the L2-L3 segment.
  • Dynamic loading: 1 hr 5 Hz/50 N, 1 hr restitution, 1 hr 5 Hz/100 N.
  • Force and displacement sampled at 25 Hz for model parameter evaluation.

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Main Results:

  • Creep behavior under cyclic loading mimicked static loading creep.
  • The four-parameter fluid model separated a progressive linear displacement term, unrecovered during restitution.
  • At 100 N, the Burger's fluid model showed superior prediction accuracy (0.97% MAE) over the solid model (1.26% MAE).

Conclusions:

  • Cyclic loading induces a non-recoverable deformation in lumbar motion segments.
  • The linear Burger's fluid model offers a more comprehensive representation of lumbar spine viscoelasticity under dynamic loads.
  • This highlights the importance of advanced viscoelastic models for understanding spinal injury mechanisms.