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Related Experiment Videos

Cervical pedicle screws: comparative accuracy of two insertion techniques.

S C Ludwig1, J M Kowalski, C C Edwards

  • 1Department of Orthopaedic Surgery and Rehabilitation, Penn State College of Medicine, Milton S. Hershey Medical Center, Hershey, Pennsylvania, USA.

Spine
|October 18, 2000
PubMed
Summary

Computer-assisted guidance and Abumi's technique showed similar accuracy for cervical pedicle screw insertion. Both methods carry risks in narrow pedicles, emphasizing careful patient selection for safe screw placement.

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Area of Science:

  • Neurosurgery
  • Orthopedic Surgery
  • Spinal Instrumentation

Background:

  • Image-guided stereotactic technology has shown promise in defining anatomic risks for cervical pedicle screw insertion.
  • Abumi's technique has demonstrated a low rate of clinically relevant screw malposition in vivo.
  • A direct comparison between image-guided technology and Abumi's technique for cervical pedicle screw insertion is lacking.

Purpose of the Study:

  • To compare the relative accuracy of two techniques for inserting cervical pedicle screws.
  • To evaluate the safety and efficacy of computer-assisted image guidance versus Abumi's technique.

Main Methods:

  • Human cadaveric cervical spines (C3-C7) were instrumented using either computer-assisted image guidance (StealthStation) or Abumi's technique.

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  • Screw placement accuracy was assessed via computed tomographic (CT) scans and anatomic dissection.
  • Cortical breaches were classified as critical (endangering vital structures) or noncritical.

    • Main Results:

    • Computer-assisted guidance resulted in 82% accurate screw placement, with 18% critical breaches.
    • Abumi's technique achieved 88% accurate screw placement, with 12% critical breaches; no significant difference between groups (P = 0.59).
    • Pedicle diameter < 4.5 mm increased the likelihood of critical breaches; vertebral artery was the most commonly injured structure.

    Conclusions:

    • Computer-assisted image guidance did not improve safety or accuracy compared to Abumi's technique for cervical pedicle screw insertion.
    • Both techniques pose a risk of critical injury in pedicles < 4.5 mm.
    • Cervical pedicle screw placement is feasible but should be reserved for selected cases with appropriate pedicle morphology.