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Acoustic emissions in vertebral cortical shell failure.

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Area of Science:

  • Biomechanics
  • Materials Science
  • Biomedical Engineering

Background:

  • Understanding bone failure initiation is crucial for fracture assessment and injury criteria development.
  • Acoustic emissions (AE) offer sensitive, early fracture detection but require distinguishing from other signals.
  • Characterizing AE from cortical bone fracture is essential for accurate analysis.

Purpose of the Study:

  • To develop and validate a technique for identifying cortical bone failure using acoustic emission signals.
  • To differentiate the unique acoustic signatures of bone fracture from other sources.
  • To establish AE as a reliable monitoring tool in biomechanical spine testing.

Main Methods:

  • Utilized Welch power spectral density and continuous wavelet transform for AE signal characterization.
  • Applied quasistatic loading to isolated cortical shell specimens from thoracic vertebral bodies.
  • Integrated acoustic sensors directly onto the bone specimens for data acquisition.

Main Results:

  • Identified a wideband frequency response (20–900 kHz) for acoustic emissions during cortical bone fracture.
  • Discovered distinct spectral peaks clustered in three frequency bands: 166 ± 52.6 kHz, 379 ± 37.2 kHz, and 668 ± 63.4 kHz.
  • Demonstrated the potential to distinguish bone failure AE from structural responses in biomechanical tests.

Conclusions:

  • Acoustic emissions possess characteristic frequency signatures that reliably indicate cortical bone failure.
  • The developed techniques enable effective utilization of AE for determining the onset of bone fracture.
  • AE analysis provides a valuable tool for biomechanical spine testing and can be adapted for other bone regions.