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Related Experiment Videos

Quantitative internal dens morphology.

J G Heller1, M D Alson, M B Schaffler

  • 1Department of Orthopaedic Surgery, Emory University School of Medicine, Atlanta, Georgia.

Spine
|August 1, 1992
PubMed
Summary
This summary is machine-generated.

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Internal dimensions of the dens (odontoid process) are highly variable. Quantitative CT analysis reveals minimum internal dens dimensions, impacting suitability for type II dens fracture fixation.

Area of Science:

  • Orthopedic Surgery
  • Radiology
  • Anatomy

Background:

  • External dimensions of the dens (odontoid process) are known to be variable.
  • Internal dimensions and their clinical implications remain largely uncharacterized.
  • Understanding dens morphology is crucial for treating axis fractures.

Purpose of the Study:

  • To quantitatively analyze the internal dimensions of the dens (odontoid process).
  • To correlate internal dens dimensions with external measurements.
  • To assess the implications of internal dens dimensions for surgical fixation of type II dens fractures.

Main Methods:

  • Quantitative computed tomography (CT) analysis of 120 axis vertebrae.
  • Nondestructive measurement of both external and internal dens dimensions.

Related Experiment Videos

  • Comparison of CT measurements with caliper-derived data for external dimensions.

    • Main Results:

    • External CT measurements showed good correlation with caliper data.
    • Minimum internal dens dimensions and cortical thicknesses were determined in sagittal and transverse planes.
    • Significant variability in internal dimensions was observed, suggesting some vertebrae may not be suitable for internal fixation.

    Conclusions:

    • Internal dens dimensions exhibit significant variability.
    • Quantitative CT analysis is essential for preoperative planning of type II dens fracture fixation.
    • Some axis vertebrae may preclude successful internal fixation due to their internal morphology.