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Related Experiment Videos

Thoracic pedicle screws: postoperative computerized tomography scanning assessment.

Robert F Heary1, Christopher M Bono, Margaret Black

  • 1Department of Neurological Surgery, New Jersey Medical School, The Spine Center of New Jersey, Newark, New Jersey 07103, USA. heary@umdnj.edu

Journal of Neurosurgery
|April 9, 2004
PubMed
Summary

Postoperative CT scanning accurately assesses thoracic pedicle screw placement using a novel grading system. Most screws were accurately placed, with Grade II misplacements most common in the middle thoracic region.

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Area of Science:

  • Neurosurgery
  • Orthopedic Surgery
  • Radiology

Background:

  • Accurate thoracic pedicle screw placement is crucial for spinal stability and preventing neurological injury.
  • Evaluating screw placement accuracy traditionally relies on intraoperative imaging, which may have limitations.

Purpose of the Study:

  • To evaluate the accuracy of thoracic pedicle screw placement using postoperative computerized tomography (CT) scanning.
  • To introduce and apply a novel grading system for classifying screw placement accuracy based on anatomical landmarks.

Main Methods:

  • 185 thoracic pedicle screws were implanted in 27 patients with image guidance or fluoroscopy.
  • Postoperative CT scans were used to grade screw placement (Grades I-V) relative to pedicle and vertebral body.
  • The thoracic spine was divided into upper, middle, and lower regions for comparative analysis.

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Main Results:

  • 86.5% of screws were Grade I (entirely within the pedicle).
  • 8.1% were Grade II (lateral pedicle breach, tip in vertebral body).
  • Misplacements (Grades II-V) occurred most frequently in the middle thoracic region, with Grade II being the most common type.

Conclusions:

  • Postoperative CT scanning is the gold standard for evaluating thoracic pedicle screw placement accuracy.
  • The proposed grading system offers a method for classifying screw placement, though further validation is needed.
  • Grade II misplacements were the most frequent type of error, particularly in the mid-thoracic spine.