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Related Concept Videos

Self-Locking Screw01:16

Self-Locking Screw

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A square-threaded screw jack is a mechanical device widely used for lifting heavy loads or applying considerable force. One of the key features that can make a screw jack more effective and reliable is its self-locking capability.
A square-threaded screw jack carrying a load is considered self-locking if the screw retains its position even after the moment applied to it is removed.
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Screw: Problem Solving01:21

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In mechanical engineering, the interaction between a threaded screw shaft and a plate gear involves analyzing the resisting torque on the plate gear that can be overpowered when a specific torsional moment is applied to the shaft. To better comprehend this concept, consider a generic situation with a threaded screw shaft with a given mean radius and lead and a plate gear with a specified mean radius. The coefficient of static friction between the screw and gear is also provided.
To evaluate the...
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Frictional Forces on Screws01:17

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Screws are characterized by a helical ridge known as a thread wrapped around a cylindrical shaft. They are commonly used as fasteners to hold objects together or to transmit power and motion in machines. One type of screw that is particularly useful for transmitting power is the square-threaded screw.
A jack with a square-threaded screw is a mechanical device used to lift heavy loads by applying a force at its handle. When the force is applied, the screw turns, raising the load. The screw can...
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Wedges01:24

Wedges

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A wedge is a simple machine that serves various purposes, such as adjusting the elevation of structural or mechanical parts, providing stability for heavy objects, and splitting a body into two parts. This versatile tool can amplify an applied force, making it easier to manipulate large or heavy objects.
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Stress Concentrations in Circular Shafts01:18

Stress Concentrations in Circular Shafts

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Consider the elastic torsion formula, which applies to a circular shaft with a consistent cross-section. This formula assumes that the shaft's ends are loaded with rigid plates firmly attached. However, in many cases, torques are applied to the shaft through mechanisms like flange couplings or gears, which are connected by keys inserted into keyways. This application method modifies the stress distribution near the point of torque application, causing it to deviate from the distributions...
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Residual Stresses in Circular Shafts01:10

Residual Stresses in Circular Shafts

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In materials that exhibit elastic and plastic behavior, known as elastoplastic materials, residual stresses can accumulate when these materials experience plastic deformation. This deformation arises from either high levels of shearing stress or significant strains. Residual stresses are internal stresses that persist within a material after removing the external force causing deformation. This phenomenon is demonstrated when observing the behavior of a shaft under torque; notably, the...
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Related Experiment Video

Updated: Feb 23, 2026

An Intramedullary Locking Nail for Standardized Fixation of Femur Osteotomies to Analyze Normal and Defective Bone Healing in Mice
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Analysis of Locking Self-Taping Bone Screws for Angularly Stable Plates.

Radek Čada1, Karel Frydrýšek2, František Sejda2

  • 1Department of Mechanical Technology, Faculty of Mechanical Engineering, VSB - Technical University of Ostrava, 17. Listopadu 2172/15, 708 33 Ostrava, Czech Republic.

Journal of Medical and Biological Engineering
|September 5, 2017
PubMed
Summary

This study investigated biomechanical issues with locking bone screws in angularly stable plates, finding Torx heads reduce stripping and improve implant extraction. The research recommends Torx heads over Inbus types for better surgical outcomes.

Keywords:
Angularly stable plateBiomechanicsLocking bone screwOrthopaedicsOsteosynthesisTraumatology

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Surgical Fixation of Sternal Fractures: Preoperative Planning and a Safe Surgical Technique Using Locked Titanium Plates and Depth Limited Drilling
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Treatment with Locking Intramedullary Nailing for Intertrochanteric Fracture of the Femur Utilizing a New Awl with a Distal Positioner

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Last Updated: Feb 23, 2026

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Area of Science:

  • Orthopaedic biomechanics
  • Traumatology implantology
  • Materials science of medical alloys

Background:

  • Locking cortical bone screws in angularly stable plates are crucial for fracture treatment.
  • Extraction difficulties, including internal hexagon stripping of screw heads, pose clinical challenges.
  • Understanding screw-plate joint mechanics is vital for improving implant design and removal.

Purpose of the Study:

  • To analyze the biomechanics of locking cortical bone screws during extraction.
  • To evaluate the impact of screw head design on internal hexagon stripping and loosening.
  • To identify optimal screw head designs for angularly stable plates in orthopaedic trauma.

Main Methods:

  • Analytical verification of screw-plate thread self-locking.
  • Experimental determination of stripping torque for Inbus type heads (3.5 mm Ti6Al4V alloy).
  • Assessment of tightening torque effects on screw loosening and strain analysis of alternative screw head designs.

Main Results:

  • The self-locking mechanism of the screw-plate joint was mathematically confirmed.
  • Stripping torque and strain-induced friction increases were experimentally quantified for Inbus heads.
  • Torx type heads exhibited significantly lower stress and strain compared to Inbus, Square, PH, and PZ types.

Conclusions:

  • The Torx head design offers superior biomechanical performance over traditional Inbus, Square, PH, and PZ types.
  • Implementing Torx heads in locking cortical bone screws can mitigate stripping and extraction problems.
  • Recommendations are made for global manufacturers to adopt Torx heads for improved angularly stable plate systems.