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Construction of local vertebral coordinate systems using a digitizing probe. Technical note

N R Crawford1, C A Dickman

  • 1Spinal Biomechanics Research Laboratory, Barrow Ncurological Institute, Phoenix, Arizona, USA.

Spine
|March 1, 1997
PubMed
Summary
This summary is machine-generated.

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A new technique uses a digitizing probe to quickly and accurately establish local coordinate axes for individual vertebrae. This method simplifies the process of analyzing three-dimensional spine motion in laboratory experiments.

Area of Science:

  • Biomechanics
  • Spinal Kinematics
  • Surgical Research

Background:

  • Analyzing multi-vertebra spine motion requires precise local coordinate systems for each vertebral level.
  • Previous methods relied on radiographs or detailed marker placement, lacking procedural specifics.
  • Establishing vertebral coordinate systems from anatomical landmarks was not well-documented.

Purpose of the Study:

  • To introduce a novel technique for establishing local coordinate axes for multiple vertebrae.
  • To accurately relate vertebral anatomical landmarks to optical markers.
  • To enable a simplified, one-time procedure at the start of spine testing experiments.

Main Methods:

  • Utilized a standard digitizing probe to identify key vertebral landmarks.

Related Experiment Videos

  • Related identified landmarks to attached optical markers on the vertebrae.
  • Developed an algorithm to construct local vertebral coordinate axes from these landmarks.

    • Main Results:

    • Successfully implemented the technique within a computerized in vitro spinal flexibility testing system.
    • Enabled real-time plotting of load-deformation curves for individual motion segments.
    • Demonstrated reduced labor and error compared to previous methods due to direct landmark identification.

    Conclusions:

    • The technique provides a fast, easy, and accurate method for relating anatomical landmarks to optical markers.
    • It efficiently constructs local coordinate axes essential for monitoring kinematics.
    • This facilitates the analysis of motion in individual segments during multi-level spine testing.