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Related Experiment Videos

Defining pseudoarthrosis in the cervical spine with differing motion thresholds.

John A Hipp1, Charles A Reitman, Nicholas Wharton

  • 1Baylor College of Medicine, Department of Orthopedic Surgery, Houston, Texas, USA. jhipp@bcm.tmc.edu

Spine
|January 13, 2005
PubMed
Summary

The rate of apparent pseudarthrosis after cervical spine fusion significantly depends on the chosen threshold for intervertebral motion. A higher motion threshold results in a lower pseudarthrosis rate in anteriorly plated fusions.

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Area of Science:

  • Orthopedic Surgery
  • Spine Fusion Research
  • Biomechanical Analysis

Background:

  • Intervertebral motion is a key outcome in spine fusion studies.
  • Current thresholds for defining pseudarthrosis are arbitrary, lacking consensus.
  • Limited data exists on pseudarthrosis rate dependency on motion thresholds.

Purpose of the Study:

  • To determine if pseudarthrosis rate is influenced by the intervertebral rotation threshold.
  • To analyze the apparent pseudarthrosis rate across various motion thresholds in cervical spine fusion.

Main Methods:

  • Calculated apparent pseudarthrosis rates for anteriorly plated cervical spine fusions.
  • Utilized flexion-extension radiographs from 200 patients one year post-fusion.
  • Assessed intervertebral motion exceeding thresholds from 1 to 4 degrees.

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Main Results:

  • The apparent pseudarthrosis rate ranged from 6% (4-degree threshold) to 44% (1-degree threshold).
  • Significant variation in pseudarthrosis rates observed based on the selected motion threshold.

Conclusions:

  • The apparent pseudarthrosis rate is highly sensitive to the chosen motion threshold.
  • Establishing a standardized motion threshold is critical for consistent pseudarthrosis assessment.