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Predicting cancellous bone failure during screw insertion.

Karen J Reynolds1, Tammy M Cleek, Aaron A Mohtar

  • 1School of Computer Science, Engineering & Mathematics, Flinders University, Adelaide, South Australia.

Journal of Biomechanics
|March 8, 2013
PubMed
Summary
This summary is machine-generated.

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Accurate screw torque is crucial for fracture fixation. This study shows insertion torque can predict bone screw failure torque, improving surgical outcomes.

Area of Science:

  • Orthopedic surgery
  • Biomedical engineering
  • Materials science

Background:

  • Internal fixation of fractures relies on bone screw stability.
  • Inconsistent bone properties, like density, complicate achieving optimal screw torque.
  • Over- or under-tightening screws compromises fracture fixation and can damage bone.

Purpose of the Study:

  • To investigate the relationship between motor torque and screw compression during powered screw insertion.
  • To determine if insertion torque can predict the ultimate failure torque of bone screws.
  • To assess the impact of bone density variations on screw insertion characteristics.

Main Methods:

  • Development and utilization of a custom test rig for bone screw experiments.
  • Insertion of cancellous bone screws into synthetic, ovine, and human bone specimens.

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  • Analysis of rotational characteristics during screw insertion to detect bone property variations.

    • Main Results:

    • Bone density variations were automatically detected through their effect on screw rotational characteristics.
    • A direct relationship was established between measured insertion torque and bone density.
    • Insertion torque was identified as a reliable predictor of ultimate bone screw failure torque.

    Conclusions:

    • Rotational characteristics during screw insertion can effectively detect bone density variations.
    • Insertion torque is a strong predictor of ultimate failure torque, independent of bone type.
    • This finding offers a method to optimize screw torque application in fracture fixation.