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[Sources of error and risks in CT based navigation].

M Arand1, L Kinzl, F Gebhard

  • 1Abteilung für Unfallchirurgie, Hand- und Wiederherstellungschirurgie, Universität Ulm, Steinhövelstrasse 9, 89075 Ulm. markus.arand@medizin.uni-ulm.de

Der Orthopade
|June 12, 2002
PubMed
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Preoperative CT data transmission and segmentation pose challenges for spinal navigation. Intraoperative matching issues and instrument problems can also occur, impacting surgical accuracy.

Area of Science:

  • Neurosurgery
  • Orthopedic Surgery
  • Medical Imaging

Background:

  • Computed tomography (CT) navigation is increasingly used in spinal surgery.
  • Accurate data acquisition and processing are crucial for successful CT-based navigation.
  • Potential challenges exist in integrating preoperative imaging with intraoperative navigation.

Purpose of the Study:

  • To identify and analyze problems and complications associated with CT-based navigation in spinal surgery.
  • To evaluate the reliability of different stages of the CT navigation workflow.
  • To assess the safety of CT-based navigation for specific spinal conditions.

Main Methods:

  • Retrospective analysis of problems and complications from 4 cervical, 102 thoracic/lumbar pedicle screw, and 14 transiliosacral screw implantations.

Related Experiment Videos

  • Categorization of issues encountered during preoperative data collection, CT dataset transmission, segmentation, planning, intraoperative matching, and navigation.
  • Documentation of specific error types and their frequencies.

    • Main Results:

    • Preoperative CT acquisition issues included incomplete target visualization and limited field of view.
    • Incomplete CT data transmission (n=16) and segmentation difficulties (n=2) were significant problems.
    • Intraoperative matching insufficiency (n=7) and instrument-related complications (n=3) were noted.
    • CT-based navigation is deemed unsafe for fractured vertebrae or unstable iliosacral joints due to potential dislocations.

    Conclusions:

    • CT-based navigation in spinal surgery requires careful attention to data integrity from acquisition to intraoperative use.
    • Segmentation and intraoperative matching are critical steps prone to errors.
    • Limitations exist for CT-based navigation in complex cases like fractured vertebrae or unstable sacroiliac joints, necessitating alternative strategies.