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Related Experiment Video

Updated: Dec 24, 2025

A Postoperative Evaluation Guideline for Computer-Assisted Reconstruction of the Mandible
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Optimizing Alignment Parameters During Craniocervical Stabilization and Fusion: A Technical Note.

Fraser Henderson1,2, Robert Rosenbaum3, Malini Narayanan4

  • 1Neurological Surgery, University of Maryland Prince George's Hospital Center, Largo, USA.

Cureus
|April 8, 2020
PubMed
Summary
This summary is machine-generated.

Proper craniocervical alignment is crucial for reducing brainstem compression and improving patient outcomes. This study highlights key alignment metrics for successful craniocervical reduction, stabilization, and fusion.

Keywords:
clival-axial anglecraniocervical alignmentcraniocervical fusioncraniocervical reductiondynamic imaginggaze anglegrabb-oakes measurementharris measurementmandible-axial angleorbital-axial angle

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Area of Science:

  • Neurosurgery
  • Orthopedic Surgery
  • Radiology

Background:

  • Craniocervical instability can lead to serious neurological deficits.
  • Maintaining proper alignment during surgical correction is essential for optimal outcomes.
  • Key metrics like the clival-axial angle (CXA) are vital for assessing reduction effectiveness.

Purpose of the Study:

  • To illustrate the critical metrics for successful craniocervical reduction, stabilization, and fusion.
  • To demonstrate the importance of normalizing the clival-axial angle (CXA) for reducing ventral brainstem compression.
  • To present a video-based guide for assessing craniocervical alignment using various radiographic measurements.

Main Methods:

  • Review of radiographic findings in a patient with cervical medullary syndrome.
  • Dynamic imaging assessment of craniocervical instability.
  • Measurement and illustration of key angles including CXA, posterior occipital cervical angle, orbital-axial angle (gaze angle), and mandible-axial angle.
  • Utilizing Harris and Grabb-Oakes measurements.

Main Results:

  • Proper craniocervical alignment optimizes cerebrospinal fluid (CSF) flow.
  • Achieving the correct "gaze angle" is important for patient function.
  • Normalization of the clival-axial angle (CXA) effectively reduces ventral brainstem compression.

Conclusions:

  • Accurate measurement and restoration of craniocervical alignment are paramount in surgical correction.
  • The clival-axial angle (CXA) is a key indicator for successful reduction and prevention of brainstem compression.
  • This video illustration serves as a valuable tool for surgeons assessing and achieving optimal craniocervical reduction.