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Related Experiment Videos

Pedicle screw pullout strength. Correlation with insertional torque

T A Zdeblick1, D N Kunz, M E Cooke

  • 1Division of Orthopedic Surgery, University of Wisconsin, Madison.

Spine
|September 15, 1993
PubMed
Summary
This summary is machine-generated.

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Insertional torque during pedicle screw placement effectively predicts bone-metal interface strength. Lower torque indicates a higher risk of screw pullout, highlighting its importance in spinal surgery fixation.

Area of Science:

  • Orthopedic Surgery
  • Biomedical Engineering
  • Spinal Fusion Techniques

Background:

  • Pedicle screw fixation is a cornerstone of spinal fusion surgery.
  • Assessing the stability of the bone-pedicle screw interface is crucial for successful outcomes.
  • Factors influencing screw purchase, such as bone density and pedicle dimensions, require further investigation.

Purpose of the Study:

  • To correlate insertional torque with pedicle screw bone/metal interface strength.
  • To evaluate the relationship between insertional torque, bone mineral density, pedicle dimensions, and screw pullout failure.
  • To determine the predictive value of insertional torque for pedicle screw fixation stability.

Main Methods:

  • Thirty human cadaveric lumbar vertebrae were instrumented with 6.5-mm pedicle screws.

Related Experiment Videos

  • Insertional torque was digitally recorded during tapping and screw placement.
  • Cyclic pedicle screw pullout tests were performed to assess failure load and cycles to failure.

    • Main Results:

    • A linear correlation was found between insertional torque and the number of cycles to pedicle screw pullout.
    • An inverse linear relationship existed between pedicle width and cycles to failure.
    • Bone mineral density showed no significant linear correlation with cycles to failure.

    Conclusions:

    • Insertional torque is a reliable predictor of pedicle screw bone-metal interface failure.
    • Pedicle dimensions, particularly width, significantly influence screw purchase and fixation stability.
    • Bone mineral density is a less effective predictor of pedicle screw fixation strength compared to insertional torque.