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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.
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...
Circular Shaft - Stresses in Linear Range01:13

Circular Shaft - Stresses in Linear Range

Consider a scenario where a circular shaft is subject to torque that remains within the boundaries of Hooke's Law, avoiding any permanent deformation. So, the formula for shearing strain is revisited. This formula is multiplied by the modulus of rigidity, and then Hooke's Law for the shearing stress and strain is applied. As a result, the equation for shearing stress in a shaft can be derived.
Deformation in a Circular Shaft01:10

Deformation in a Circular Shaft

One of the distinctive characteristics of circular shafts is their ability to maintain their cross-sectional integrity under torsion. In other words, each cross-section continues to exist as a flat, unaltered entity, simply rotating like a solid, rigid slab. To understand the distribution of shearing stress within such a shaft, consider a cylindrical section inside this circular shaft. This section has a length of L and a radius of R, with one end fixed. The radius of the cylindrical section is...
Steel Fastening Techniques01:17

Steel Fastening Techniques

Steel sections can be joined together through various fastening techniques including riveting, bolting, and welding, each suitable for different structural requirements and conditions.
Rivets are cylindrical steel fasteners with a specially designed head. During application, rivets are heated until white-hot and then inserted through pre-drilled holes in the steel sections. A pneumatic hammer is used to shape the exposed end into a second head, securing the sections together.
Bolting is another...
Lumber Defects01:23

Lumber Defects

Lumber defects, which can affect both the appearance and structural integrity of wood, include a variety of growth and manufacturing flaws. Growth defects such as knots and knotholes occur where branches were once attached to the tree trunk, with knotholes forming when these knots fall out. Other natural defects include decay and insect damage, which compromise the wood's strength and durability.
Shakes are minor fractures that run along or across the wood's annual rings, while wane is...

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Related Experiment Video

Updated: Jun 16, 2026

Quasistatic Mechanical Testing for Computer-Aided Design and Manufacturing Occlusal Veneers Cemented to Milled Dentin Analog Material
07:42

Quasistatic Mechanical Testing for Computer-Aided Design and Manufacturing Occlusal Veneers Cemented to Milled Dentin Analog Material

Published on: December 20, 2024

Five Duraloc locking ring failures.

Cara C Powers1, Kevin B Fricka, Matthew S Austin

  • 1Anderson Orthopedic Research Institute, Alexandria, Virginia.

The Journal of Arthroplasty
|January 26, 2010
PubMed
Summary
This summary is machine-generated.

Locking ring failures in Duraloc hip implants can occur due to neck/liner impingement and excessive wear. Addressing cup anteversion and superior head migration is crucial for preventing these complications.

Related Experiment Videos

Last Updated: Jun 16, 2026

Quasistatic Mechanical Testing for Computer-Aided Design and Manufacturing Occlusal Veneers Cemented to Milled Dentin Analog Material
07:42

Quasistatic Mechanical Testing for Computer-Aided Design and Manufacturing Occlusal Veneers Cemented to Milled Dentin Analog Material

Published on: December 20, 2024

Area of Science:

  • Orthopedic surgery
  • Biomaterials science
  • Medical device engineering

Background:

  • The Duraloc acetabular component is a widely used implant in total hip arthroplasty.
  • Locking ring mechanisms are critical for securing the liner to the acetabular shell.
  • Failures of these components can necessitate revision surgery, impacting patient outcomes.

Observation:

  • Five cases of revision surgery for Duraloc locking ring failure were analyzed.
  • Retrieved liners exhibited posterior neck/liner impingement and superior edge loading or significant wear.
  • These findings suggest a pattern of mechanical stress leading to component failure.

Findings:

  • Superior head migration and subsequent neck/liner impingement, potentially exacerbated by excessive cup anteversion, are implicated in locking ring failures.
  • The specific biomechanical interactions within the hip joint appear to contribute to the observed wear and impingement patterns.
  • The incidence of this specific complication requires further investigation through larger cohort studies.

Implications:

  • Patients experiencing Duraloc locking ring failure require close monitoring for potential adverse events.
  • Revision strategies may include complete acetabular component revision, utilization of face-changing liners, or cementing liners to address suboptimal component positioning.
  • Further research into implant design and surgical technique is warranted to mitigate the risk of locking ring failures in hip arthroplasty.