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The most basic experimental design involves two groups: the experimental group and the control group. The two groups are designed to be the same except for one difference— experimental manipulation. The experimental group gets the experimental manipulation—that is, the treatment or variable being tested—and the control group does not. Since experimental manipulation is the only difference between the experimental and control groups, we can be sure that any differences between...
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Improving socket design to prevent difficult removal of locking screws.

Chen-Huei Lin1, Ching-Kong Chao1, Yi-Hsuan Tang1

  • 1Department of Mechanical Engineering, National Taiwan University of Science and Technology, Taipei, Taiwan.

Injury
|February 10, 2018
PubMed
Summary

Titanium screw slippage is a growing concern. New socket designs like Torx and Octatorx significantly reduce slippage and improve torque compared to traditional hex sockets, preventing difficult screw removal.

Keywords:
Locking plateMaximal torqueScrew head socketTitaniumTorsion test

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Area of Science:

  • Biomaterials Engineering
  • Orthopedic Surgery
  • Mechanical Engineering

Background:

  • Titanium screws are increasingly used in medical implants.
  • Driver slippage and cold welding issues with titanium screws, especially hex sockets, lead to difficult removal and surgical complications.
  • Improved screw socket design is needed to prevent these problems.

Purpose of the Study:

  • To evaluate and compare the performance of various screw socket designs.
  • To identify optimal designs that prevent driver slippage and facilitate screw removal.
  • To address complications associated with titanium screw fixation.

Main Methods:

  • Manufactured titanium screws with small (hex, Torx, cruciate) and large (hex, Torx, Octatorx, Torx+ I-III) sockets.
  • Conducted torsional tests on screw heads and drivers at 1mm and 2mm insertion depths.
  • Recorded maximum torque and failure patterns for ten specimens of each design.

Main Results:

  • Hex sockets exhibited slippage and reduced torque, particularly at 1mm depth.
  • Large sockets generally provided higher torque than small sockets.
  • Octatorx and Torx plus designs demonstrated superior torque and resistance to slippage compared to hex sockets.

Conclusions:

  • Hex socket design is prone to slippage and torque reduction, especially with insufficient driver engagement.
  • Larger socket designs and advanced geometries (Octatorx, Torx plus) significantly enhance torque and prevent slippage.
  • Optimized screw socket designs can effectively mitigate issues of slippage and difficult removal in titanium screws.