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Related Experiment Videos

A new method for detecting pedicular wall perforation during pedicle screw insertion.

C Kosay1, O Akcali, R H Berk

  • 1the Department of Histology, Dokuz Eylül University School of Medicine, Alsancak Izmir, Turkey. canko@superonline.com

Spine
|July 18, 2001
PubMed
Summary

Observing fatty particles expelled during pedicle screw insertion can help detect perforations. This simple method improves the accuracy of pedicle screw placement, reducing potential complications.

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Area of Science:

  • Spinal surgery
  • Orthopedic biomechanics
  • Surgical safety

Background:

  • Pedicle screw misplacement remains a significant issue in spinal surgery, leading to potential complications.
  • While advanced techniques exist, their widespread availability is limited, necessitating simpler methods for accurate screw placement.

Purpose of the Study:

  • To evaluate the accuracy of observing expelled fatty material for detecting pedicular wall perforations during pedicle screw insertion.

Main Methods:

  • Assessed the sensitivity, specificity, and predictive values of observing expelled fatty material after drilling for pedicle screw insertion.
  • Verified pedicle screw positions using computed tomography (CT) in 74 insertions.
  • Recorded outflows of blood and fatty particles separately.

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Main Results:

  • Visible fatty particles were observed in 51 insertions, confirmed histologically to originate from bone marrow.
  • The method demonstrated high specificity (98%) and negative predictive value (95%) for detecting perforations.
  • Sensitivity was 73% and positive predictive value was 84%.

Conclusions:

  • Observing fatty particles in expelled blood is a simple, instrument-free indicator of no perforation along the pedicle screw pathway.
  • This method can enhance the accuracy of pedicle screw insertion, used alone or in conjunction with other techniques.