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Related Experiment Videos

C2 crossing laminar screws: cadaveric morphometric analysis.

Michael Y Wang1

  • 1Department of Neurological Surgery, Keck School of Medicine, University of Southern California, Los Angeles, California 90033, USA. myw@usc.edu

Neurosurgery
|August 5, 2006
PubMed
Summary
This summary is machine-generated.

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C2 laminar screws offer a safer alternative for axis fixation, reducing vertebral artery injury risk. Preoperative CT scans are crucial due to variable C2 lamina thickness for safe screw placement.

Area of Science:

  • Neurosurgery
  • Orthopedic Surgery
  • Spinal Anatomy

Background:

  • C2 screw fixation via pars or pedicle carries a risk of vertebral artery injury.
  • C2 crossing laminar screws provide rigid fixation of the axis.
  • This dorsal technique minimizes injury to neural and vascular structures.

Purpose of the Study:

  • To evaluate the feasibility and safety of C2 crossing laminar screws.
  • To determine critical morphometric measurements for C2 laminar screw placement.

Main Methods:

  • Morphometric analysis of 38 cadaveric spines.
  • Measurement of screw entry points, trajectories, and lengths for 3.5 and 4.0 mm screws.
  • Assessment of laminar cross-sectional area and diameter.

Related Experiment Videos

Main Results:

  • Average maximal screw length was 32 mm (range: 27-37 mm).
  • Minimal laminar cross-sectional area averaged 75 mm², cancellous bone area averaged 39 mm².
  • Significant variability in lamina thickness noted, potentially precluding screw placement in some cases.

Conclusions:

  • C2 laminar screw placement is generally safe if implants remain intraosseous.
  • Variable C2 lamina thickness requires preoperative CT scanning to ensure adequate bone accommodation for screws.