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Related Concept Videos

Machines: Problem Solving I01:22

Machines: Problem Solving I

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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.
The toggle clamp system is a machine structure consisting of movable, pin-connected multi-force members that form a stabilized system to transmit forces. The...
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Stress Concentrations in Circular Shafts01:18

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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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Increased Reduction Clamp Force Associated With Syndesmotic Overcompression.

Jacob Haynes1, Steven Cherney1, Amanda Spraggs-Hughes1

  • 1Washington University School of Medicine, St. Louis, Missouri, USA.

Foot & Ankle International
|February 27, 2016
PubMed
Summary
This summary is machine-generated.

Excessive clamp force during ankle fracture surgery can lead to syndesmotic overcompression. Surgeons should monitor clamp force to ensure optimal reduction and patient outcomes.

Keywords:
ankle fracturemalreductionovercompressionsyndesmosistrauma

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Area of Science:

  • Orthopedic Surgery
  • Anatomy
  • Biomechanical Engineering

Background:

  • Distal tibiofibular syndesmosis disruption occurs in up to 45% of operatively treated ankle fractures.
  • Syndesmotic malreduction is linked to poor patient outcomes.
  • Quantifying clamp force during syndesmotic reduction is crucial.

Purpose of the Study:

  • To quantify clamp force during syndesmotic reduction.
  • To evaluate the impact of clamp force on fibular overmedialization (overcompression).
  • To establish objective force thresholds for optimal syndesmotic reduction.

Main Methods:

  • Prospective cohort study of 21 patients undergoing syndesmotic reduction and fixation.
  • Utilized modified reduction forceps with an integrated load cell to measure clamp force.
  • Assessed syndesmotic reduction using postoperative bilateral CT scans, comparing injured to uninjured ankles.

Main Results:

  • Syndesmotic overcompression was observed in 52% of patients (11 of 21).
  • A significant correlation was found between increased clamp force and syndesmotic overcompression.
  • Mean clamp forces were 88 N (undercompressed), 130 N (adequate), and 163 N (overcompressed).

Conclusions:

  • Increased clamp forces significantly correlate with syndesmotic overcompression.
  • Objective force ranges associated with overcompression were determined.
  • Surgeons must be aware of and control clamp force during syndesmotic reduction.