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Related Experiment Videos

Effect of insertion torque on bone screw pullout strength.

K J Lawson1, J Brems

  • 1Department of Orthopedic Surgery, Mercy and Redding Medical Centers, Calif, USA.

Orthopedics
|May 31, 2001
PubMed
Summary

Excessive insertion torque can significantly reduce the holding strength of ASIF/AO cortical bone screws. Optimal torque is crucial for maintaining screw stability in orthopedic surgery.

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Area of Science:

  • Orthopedic biomechanics
  • Surgical implant technology

Background:

  • Cortical bone screws are vital in orthopedic fixation.
  • Insertion torque is a critical parameter influencing screw performance.
  • Understanding torque's effect on holding strength is essential for surgical success.

Purpose of the Study:

  • To investigate the impact of varying insertion torques on the in vitro holding strength of 4.5-mm ASIF/AO cortical bone screws.
  • To determine the relationship between insertion torque levels and screw pullout strength in different bone models.

Main Methods:

  • In vitro biomechanical testing using an Instron materials testing machine.
  • Evaluation of 4.5-mm ASIF/AO cortical bone screws in lamb femora and human tibiocortical bone specimens.
  • Application of low, intermediate, high, and thread-damaging insertion torques, normalized to bone engagement.

Main Results:

  • Screws inserted with thread-damaging torque exhibited significantly diminished holding strength.
  • High torque in single cortex engaging screws also led to reduced holding strength.
  • Observed strength loss ranged from 40% to 50% compared to optimally inserted screws.

Conclusions:

  • Thread-damaging insertion torque compromises the mechanical integrity and holding power of ASIF/AO cortical bone screws.
  • Careful control of insertion torque is necessary to ensure optimal screw fixation and prevent construct failure in orthopedic procedures.

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