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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.
Upward Impending Motion01:21

Upward Impending Motion

A square-threaded screw jack is a mechanical device widely used for lifting heavy loads or applying considerable force. Its operation is based on converting the force applied at its handle into a torsional moment, causing the upward impending motion of the screw. This movement is accomplished by overcoming the static friction between the threads of the screw and the jack.
To better comprehend how a screw jack functions, consider the completely unraveled thread as a block in contact with 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...
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...
General Case of Eccentric Axial Loading01:12

General Case of Eccentric Axial Loading

Unsymmetrical bending occurs when the bending moment applied to a structural member does not align with its principal axis. This misalignment leads to complex stress distributions and deflection patterns that differ from symmetrical bending, which are essential for designing structures to withstand different loading conditions.
Consider a member subjected to equal and opposite forces that are applied along a line that does not coincide with the member's neutral axis. In unsymmetrical bending,...
Plastic Deformation in Circular Shafts01:20

Plastic Deformation in Circular Shafts

When materials are subjected to forces that surpass their yield strength, they undergo a process known as plastic deformation. This results in a permanent alteration or strain in their structure. This concept can be specifically applied to circular shafts, where the deformation leads to a change in its shape. The precise evaluation of this plastic deformation requires understanding the stress distribution within the circular shaft, which is achieved by calculating the maximum shearing stress in...

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Related Experiment Video

Updated: Jun 28, 2026

Imaging of the Microstructural Failure Mechanism in the Human Hip
08:43

Imaging of the Microstructural Failure Mechanism in the Human Hip

Published on: September 29, 2023

Rare mode of dynamic hip screw failure.

A Khanna1, A Khanna, M Parker

  • 1Department of Trauma and Orthopaedics, Peterborough District Hospital, Peterborough, UK. dranilkhanna@yahoo.com

Hip International : the Journal of Clinical and Experimental Research on Hip Pathology and Therapy
|October 17, 2008
PubMed
Summary

Sliding hip screw (SHS) failure is rare, typically occurring at the plate screw junction. This case details a unique SHS failure at the barrel and screw junction after successful intertrochanteric fracture healing.

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Surgical Technique of the 3-Dimensional-printed Personalized Hip Implant for the Treatment of Canine Hip Dysplasia
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Surgical Technique of the 3-Dimensional-printed Personalized Hip Implant for the Treatment of Canine Hip Dysplasia

Published on: April 19, 2024

Related Experiment Videos

Last Updated: Jun 28, 2026

Imaging of the Microstructural Failure Mechanism in the Human Hip
08:43

Imaging of the Microstructural Failure Mechanism in the Human Hip

Published on: September 29, 2023

Surgical Technique of the 3-Dimensional-printed Personalized Hip Implant for the Treatment of Canine Hip Dysplasia
08:40

Surgical Technique of the 3-Dimensional-printed Personalized Hip Implant for the Treatment of Canine Hip Dysplasia

Published on: April 19, 2024

Area of Science:

  • Orthopaedic surgery
  • Biomedical engineering
  • Trauma care

Background:

  • The sliding hip screw (SHS) is a standard implant for intertrochanteric femur fracture fixation.
  • SHS failure is uncommon, usually observed at the plate screw junction.

Observation:

  • A rare instance of SHS failure is presented.
  • The failure occurred at the junction of the barrel and screw.
  • The patient was asymptomatic with uneventful fracture healing prior to failure.

Findings:

  • This case highlights an unusual failure mode of the SHS implant.
  • The failure location differed from the typical plate screw junction.

Implications:

  • Understanding rare failure mechanisms is crucial for improving implant design.
  • This case may inform future orthopaedic trauma surgical techniques and implant selection.