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Real-time visualization of joint cavitation.

Gregory N Kawchuk1, Jerome Fryer2, Jacob L Jaremko3

  • 1Department of Physical Therapy, Faculty of Rehabilitation Medicine, University of Alberta, Edmonton, Alberta, Canada.

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|April 16, 2015
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Summary

Joint cracking sounds are caused by cavity formation, not bubble collapse. Real-time MRI shows rapid cavity inception during joint separation, confirming tribonucleation as the mechanism.

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Area of Science:

  • Biophysics
  • Musculoskeletal System Imaging
  • Rheumatology

Background:

  • Joint cracking sounds have been historically attributed to bubble collapse within synovial joints.
  • This traditional explanation is inconsistent with observed physical phenomena of joint cracking.

Purpose of the Study:

  • To investigate the mechanism of joint cracking using real-time magnetic resonance imaging (MRI).
  • To provide direct evidence for the cause of joint cracking sounds in human synovial joints.

Main Methods:

  • Ten metacarpophalangeal joints were subjected to long-axis traction using a flexible tube and cable system.
  • Static 3D T1-weighted MRI scans were acquired before and after traction.
  • Rapid cine MRI (3.2 frames/second) captured joint dynamics during traction until cracking occurred.

Main Results:

  • Real-time MRI demonstrated rapid cavity inception at the moment of joint separation and sound production.
  • The resulting cavity remained visible after the cracking event.
  • This provides direct experimental evidence that joint cracking is associated with cavity inception.

Conclusions:

  • Joint cracking is caused by cavity formation (tribonucleation), not bubble collapse.
  • This study presents the first in-vivo macroscopic demonstration of tribonucleation in human joints.
  • Findings offer a new framework for investigating health outcomes related to joint cracking.