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Related Concept Videos

Self-Locking Screw01:16

Self-Locking Screw

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.
Wedges01:24

Wedges

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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Machines: Problem Solving I01:22

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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Screw: Problem Solving01:21

Screw: Problem Solving

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...
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...
Moment of a Force: Problem Solving01:29

Moment of a Force: Problem Solving

Understanding the scalar formulation of the moment of a force and applying it correctly through problem-solving is crucial in designing and analyzing mechanical systems. Here are the steps for problem-solving with the moment of a force:

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Adjustable Stiffness, External Fixator for the Rat Femur Osteotomy and Segmental Bone Defect Models
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Difficulties encountered removing locked plates.

S Raja1, A M Imbuldeniya, S Garg

  • 1James Paget University Hospitals NHS Foundation Trust, Great Yarmouth, Norfolk, UK. sraja@doctors.org.uk

Annals of the Royal College of Surgeons of England
|October 4, 2012
PubMed
Summary
This summary is machine-generated.

Removing locked plates can be challenging, with a 47% complication rate due to difficulties with screw and implant removal. Surgeons should be prepared for potential intraoperative issues when extracting these implants.

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Area of Science:

  • Orthopedic Surgery
  • Biomaterials Engineering

Background:

  • Locked plates are widely used for periarticular fractures, including in osteoporotic bone, offering stable fixation.
  • Over 150 locked plates were used in knee and ankle fractures over three years with varied success.
  • Clinical experience with locked plate removal in adult patients is reported, addressing indications like implant failure, infection, and non-union.

Purpose of the Study:

  • To report clinical experience and difficulties encountered during locked plate removal.
  • To analyze the complication rate associated with locked plate removal.
  • To provide recommendations for surgeons regarding locked plate removal procedures.

Main Methods:

  • Retrospective analysis of 36 consecutive adult patients undergoing locked plate removal.
  • Data collected included indication for fixation and removal, implant duration, surgeon grade, and removal difficulties.
  • Prospective database enrollment for data collection.

Main Results:

  • A 47% complication rate was observed during implant removal.
  • Difficulty in removing locked screws and the plate itself were major problems.
  • Ten cold-welded screws were found in eight cases; removal tools were essential.

Conclusions:

  • Intraoperative difficulties are increasingly common with the popularity of locked plates.
  • Surgeons must be aware of potential complications during locked plate removal.
  • Availability of fluoroscopic control and specialized equipment like metal cutting burrs and screw removal sets is recommended.