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Related Experiment Videos

Shock absorption in lumbar disc prosthesis: a preliminary mechanical study.

J C LeHuec1, T Kiaer, T Friesem

  • 1Department of Orthopedics, CHU Pellegrin Tripode, Bordeaux, France. j-c.lehuec@chu-bordeaux.fr

Journal of Spinal Disorders & Techniques
|August 7, 2003
PubMed
Summary

Both ultra-high-molecular-weight polyethylene and metal-on-metal lumbar disc prostheses demonstrated identical shock absorption capabilities. Testing confirmed similar vibration and shock transmissibility, indicating comparable performance in these designs.

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Area of Science:

  • Biomedical Engineering
  • Orthopedic Surgery
  • Spinal Biomechanics

Background:

  • Lumbar disc prostheses are utilized for symptomatic degenerative disc disease.
  • Current ball-socket prostheses feature either polymer or metal-on-metal bearings.
  • "Shock absorber" design prostheses were not widely available at the study's inception.

Purpose of the Study:

  • To compare the shock absorption capacity of two distinct lumbar total disc prostheses.
  • To evaluate devices with ultra-high-molecular-weight polyethylene (UHMWPE) versus metal-on-metal bearings.
  • To determine differences in vibration and shock transmissibility between designs.

Main Methods:

  • Two lumbar total disc prostheses (PRODISC and MAVERICK) were subjected to vibration and shock loading.

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  • Shock absorption was assessed by comparing input and output force measurements using integrated force sensors.
  • Testing involved static preload with oscillating vibration (0-100 Hz) and sudden shock load (250 N over 0.1s).

    • Main Results:

    • Both tested prostheses exhibited identical vibration and shock transmissibility.
    • Under oscillating vibration, transmission ratios exceeded 99.8% for both devices, with <0.3% difference.
    • Under sudden shock loading, transmission ratios surpassed 98% for both devices, with <0.8% difference.

    Conclusions:

    • Both ultra-high-molecular-weight polyethylene and metal-on-metal lumbar disc prostheses demonstrated equivalent vibration and shock transmissibility.
    • The tested devices function similarly in their capacity to absorb shock and vibrations.
    • This suggests comparable biomechanical performance regarding shock absorption between these two types of lumbar disc prostheses.