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Related Concept Videos

Frictional Forces on Screws01:17

Frictional Forces on Screws

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Twin-Screw Extrusion Process to Produce Renewable Fiberboards
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Insertion profiles of 4 headless compression screws.

Adam Hart1, Edward J Harvey, Louis-Philippe Lefebvre

  • 1Division of Orthopedic Surgery, McGill University Health Centre, McGill University, Montreal, Canada. adam.hart@mail.mcgill.ca

The Journal of Hand Surgery
|July 2, 2013
PubMed
Summary

Surgeons should not rely on insertion torque for screw compression. All tested screws provided similar compression at -2 mm insertion depth, suggesting implant choice should consider factors beyond compression alone.

Keywords:
Headless compression screwinsertion depthinsertion torqueinterfragmentary compressionscaphoid fracture

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Area of Science:

  • Orthopedic surgery
  • Biomechanical engineering
  • Implant design

Background:

  • Surgeons use insertion depth and torque to estimate screw compression during orthopedic procedures.
  • A clear understanding of the relationship between these factors and actual compression is crucial for optimal outcomes.

Purpose of the Study:

  • To investigate the correlation between screw insertion depth, insertion torque, and interfragmentary compression.
  • To compare the compression profiles of four different orthopedic screws.

Main Methods:

  • Four screw types (Acutrak Standard, Acutrak Mini, Synthes 3.0, Herbert-Whipple) were tested in a polyurethane foam scaphoid model.
  • A specialized jig measured compression force, insertion torque, and insertion depth simultaneously.
  • Testing continued until screw failure at half-turn intervals.

Main Results:

  • Peak compression varied by screw type, occurring at different insertion depths (e.g., -3.1 mm for Acutrak Mini, 1.5 mm for Synthes).
  • At -2 mm insertion depth, compression was not significantly different between the four screw types.
  • Insertion torque showed a poor correlation with compression across all tested screws.

Conclusions:

  • Implant selection should not solely depend on compression profiles, as differences at common depths were minimal.
  • Conical screws achieved peak compression when fully buried, while shanked screws did so earlier.
  • Surgeons should not rely on tactile feedback of insertion torque as a proxy for compression; understanding insertion profiles is key to optimizing fixation.