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Unilateral Cervical Spine Facet Fractures: Radiographic Predictors of Instability.

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CT scan findings of fracture displacement and multifragmentary nature in unilateral cervical spine facet fractures predict instability on MRI. This aids in determining the need for surgical stabilization in patients with these injuries.

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Area of Science:

  • Orthopedics
  • Radiology
  • Neurosurgery

Background:

  • Subaxial cervical spine facet fractures require management based on neurological status and injury stability.
  • Ligamentous instability is a key predictor for surgical intervention.
  • While CT evaluates facet fractures, specific CT findings predicting MRI-defined instability are less understood.

Purpose of the Study:

  • To identify computed tomography (CT) characteristics of unilateral cervical spine facet fractures that predict instability on magnetic resonance imaging (MRI).

Main Methods:

  • Retrospective cohort study of 49 patients with unilateral cervical facet fractures.
  • CT scans were analyzed for fracture fragment measurements.
  • MRIs were independently assessed for instability scores.
  • CT parameters were correlated with MRI instability scores to predict the need for surgery.

Main Results:

  • Fracture displacement and multifragmentary fractures on CT significantly correlated with higher MRI instability scores.
  • The average MRI instability score was significantly higher in the operative group (3.34) compared to the conservative group (1.06).
  • Fracture displacement (P=0.013) and multifragmentary fractures (P<0.001) predicted the need for operative stabilization.

Conclusions:

  • CT findings of significant displacement and comminution in subaxial cervical facet fractures correlate strongly with MRI-determined instability.
  • These CT characteristics suggest a higher likelihood of requiring operative stabilization.
  • Fracture size alone did not correlate with ligamentous injury severity.