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Related Concept Videos

Frictional Forces on Screws01:17

Frictional Forces on Screws

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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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.
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Machines: Problem Solving I

A toggle clamp is a mechanical device commonly used for holding and clamping objects in various applications, such as woodworking, metalworking, and assembly operations. Consider a toggle clamp subjected to a force of 200 N at the handle. The vertical clamping force can be calculated, provided the dimensions of the toggle clamp are known.
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Related Experiment Video

Updated: Jun 21, 2026

Surgical Fixation of Sternal Fractures: Preoperative Planning and a Safe Surgical Technique Using Locked Titanium Plates and Depth Limited Drilling
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Technical difficulties in hardware removal in titanium compression plates with locking screws.

M Ehlinger1, P Adam, P Simon

  • 1Orthopaedics and Traumatology Department, Strasbourg University Hospital, 1, avenue Molière, 67098 Strasbourg cedex, France. matthieu.ehlinger@chru-strasbourg.fr

Orthopaedics & Traumatology, Surgery & Research : OTSR
|August 4, 2009
PubMed
Summary

Removing locking screws from internal fixation devices can be challenging. Solutions involve specific drilling techniques and tools to prevent complications during hardware removal, especially with minimally invasive surgery.

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Area of Science:

  • Orthopedic Surgery
  • Biomaterials Science
  • Surgical Techniques

Background:

  • Locking screws fixation devices are widely used in orthopedic surgery.
  • Hardware removal can present unique challenges, particularly with locking compression plates (LCP).
  • Minimally invasive surgery techniques can exacerbate difficulties during hardware removal.

Purpose of the Study:

  • To identify common problems encountered during the removal of internal fixation hardware, specifically locking screws.
  • To evaluate and propose solutions for these hardware removal challenges.
  • To emphasize preventative strategies for easier and safer hardware removal.

Main Methods:

  • Review of complications associated with locking screw removal.
  • Description of techniques for managing jammed screws and destroyed screw heads.
  • Discussion of methods for plate extraction when screw holes are filled.
  • Analysis of consequences and preventative measures.

Main Results:

  • Screws may jam due to poor technique or excessive force, requiring destructive methods like tungsten drills and trephine drills for removal.
  • Destruction of the screw head recess necessitates specialized tools like conical left-turn screwdrivers.
  • Plate extraction can be complicated by filled screw holes, requiring lever arm maneuvers.
  • Complications include increased operative time, risk of secondary invasive surgery, metallic debris, and iterative fractures.

Conclusions:

  • Effective management of locking screw removal complications requires specific techniques and tools.
  • Preventative measures, including proper surgical technique and use of torque-controlling screwdrivers, are crucial.
  • Optimizing hardware removal is essential to avoid adverse outcomes and ensure patient safety.