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Imaging articular cartilage under compression--cartilage elastography.

Peter A Hardy1, Anne C Ridler, Cameron B Chiarot

  • 1Center for Biomedical Engineering, University of Kentucky, Lexington, 40536, USA. hardy@mri.uky.edu

Magnetic Resonance in Medicine
|April 22, 2005
PubMed
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We developed a new MRI technique to measure mechanical properties of articular cartilage. This method visualizes changes in cartilage stiffness due to enzymatic degradation, offering insights into tissue health.

Area of Science:

  • Biomedical Engineering
  • Medical Imaging
  • Orthopedics

Background:

  • Articular cartilage mechanical properties are crucial for joint function.
  • Assessing cartilage degradation non-invasively is vital for early diagnosis and treatment.
  • Existing methods for evaluating cartilage mechanics can be invasive or lack spatial resolution.

Purpose of the Study:

  • To develop and validate a novel magnetic resonance imaging (MRI) technique for assessing articular cartilage mechanical properties.
  • To visualize and quantify changes in cartilage stiffness and strain patterns.
  • To evaluate the technique's sensitivity to enzymatic degradation of cartilage.

Main Methods:

  • A custom device was built to compress small articular cartilage samples within a 1.5 T MRI scanner.

Related Experiment Videos

  • Piezoelectric piston used for controlled compression (2 Hz) of 1-cm-diameter, 200-micrometer thick samples.
  • Displacement-sensitive stimulated-echo acquisition mode (STEAM) sequence employed for simultaneous imaging and compression.
  • Technique validated with silicone phantoms and compared before and after trypsin digestion of cartilage samples.
  • T(1)-weighted images with GdDTPA contrast agent used to visualize degradation extent.

    • Main Results:

    • Elastographic images successfully depicted compression and differential strain in both parallel and perpendicular directions relative to the cartilage surface.
    • Static elastographic images showed a decrease in the elastic modulus of cartilage samples after trypsin digestion.
    • Spatial variations in elastic modulus correlated with enzymatic degradation visualized by T(1) images.
    • The technique demonstrated sensitivity to changes in mechanical properties induced by enzymatic digestion.

    Conclusions:

    • The developed MRI-based elastography technique effectively measures mechanical properties of articular cartilage.
    • This method allows for visualization of spatially varying changes in cartilage stiffness due to degradation.
    • The technique holds promise for studying cartilage biomechanics and potentially for clinical applications in joint disease assessment.