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Related Concept Videos

Water Cement Ratio01:28

Water Cement Ratio

The water-cement ratio is pivotal in defining concrete's quality. This ratio, a balance between the weight of water and cement in the mix, shapes the concrete's strength, durability, and resistance to environmental factors. As identified by Abrams’ law, less water in the mix equates to stronger concrete. However, water is essential not only for the chemical process of hydration but also for the concrete's workability and compaction. While hydration chemically binds water and cement, physical...
Fiber Reinforced Concrete01:22

Fiber Reinforced Concrete

Fiber-reinforced concrete significantly enhances the structural and nonstructural properties of traditional concrete by incorporating fibers like steel, glass, and polymers. These fibers, varying from natural ones such as sisal and cellulose to manufactured ones like polypropylene and Kevlar, are mixed into hydraulic cement with aggregates. Steel fibers, often preferred for their robustness, contribute to improved ductility, toughness, and post-cracking performance. The concrete is classified...
Superplasticizers01:30

Superplasticizers

Superplasticizers are advanced admixtures that enhance the workability of concrete by lowering the water content without compromising the strength of the material. These substances are highly effective water reducers, improving concrete flow, making it easier to work with, and enabling concrete to reach inaccessible areas or densely reinforced sections without mechanical vibration. The key components in superplasticizers are either sulfonated melamine or naphthalene formaldehyde condensates,...
Elasticity in Concrete01:20

Elasticity in Concrete

Upon subjecting concrete to moderate or high uniaxial compressive or tensile stresses, the strain response is non-linear relative to the stress applied. As the stress is removed, the resulting stress-strain curve deviates from the original path traced during loading, creating a hysteresis loop, indicative of the concrete's non-linear and non-elastic properties. Typically, a material's modulus of elasticity, which is a measure of the material's stiffness, is inferred from the linear portion of...
Dynamic Modulus of Elasticity of Concrete01:16

Dynamic Modulus of Elasticity of Concrete

The dynamic modulus of elasticity assesses how a concrete structure deforms under impact or dynamic loads. It is typically higher than the static modulus of elasticity, measured under slow, steady loading conditions.
The sonic test is a common method to determine the dynamic modulus. In this test, a concrete beam, sized either 6 x 6 x 30 inches or 4 x 4 x 20 inches, is clamped at its center. Vibrations are initiated at one end of the beam by an electromagnetic exciter unit powered by a...
Permeability of Concrete01:25

Permeability of Concrete

Permeability in the context of concrete refers to how easily liquids or gases can pass through the material. This quality is crucial for assessing the water-tightness and durability of concrete structures and their resistance to chemical attacks. Concrete permeability can be determined through comparative laboratory tests. These tests typically involve sealing a concrete specimen from the sides, applying water pressure to the top surface with pressure, and measuring the amount of water passing...

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Related Experiment Video

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Treatment of Ankle Osteoarthritis with Total Ankle Replacement Through a Lateral Transfibular Approach
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Comparing Rates of Radiographic Baseplate Loosening Between Cement and Cementless INFINITY Total Ankle Prostheses.

Ian Daniel Millstein1, Manisha Koneru1, John Epoh Dibato2

  • 1Cooper Medical School, Rowan University, Camden, New Jersey.

Foot & Ankle Specialist
|April 27, 2024
PubMed
Summary

Cemented and cementless total ankle replacements showed similar rates of periprosthetic radiolucency. This suggests implant fixation method may not significantly impact early radiolucency in ankle osteoarthritis surgery.

Keywords:
ankleoutcomes measurestotal ankle arthroplasty prosthesestotal ankle replacement

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Area of Science:

  • Orthopedic Surgery
  • Biomaterials Engineering

Background:

  • Total ankle replacement (TAR) addresses end-stage ankle osteoarthritis.
  • Periprosthetic radiolucency may indicate prosthesis failure risk.
  • Cement fixation is a potential method to mitigate radiolucency.

Purpose of the Study:

  • To compare periprosthetic radiolucency rates between cemented and cementless INFINITY Total Ankle System implants.
  • To evaluate the influence of cementation on early radiographic outcomes in TAR.

Main Methods:

  • Retrospective analysis of 28 patients undergoing TAR with the INFINITY system (Jan 2016-May 2022).
  • Radiographic review of anteroposterior, mortise, and lateral ankle X-rays by two independent reviewers.
  • Assessment of tibiotalar angle, talar tilt, and periprosthetic radiolucency; statistical analysis using Wilcoxon rank-sum and chi-square tests.

Main Results:

  • No significant difference in periprosthetic radiolucency incidence between cemented and cementless groups (57.1% in both).
  • P-value of 1.0 indicates no statistical difference in radiolucency.
  • Follow-up tibiotalar and talar tilt angles were also not significantly different between groups (P > .51).

Conclusions:

  • Cemented total ankle prostheses demonstrated similar periprosthetic radiolucency rates compared to cementless implants.
  • Early radiographic findings suggest no significant advantage of cementation in reducing radiolucency.
  • Further research into long-term clinical outcomes is necessary to guide optimal surgical techniques for ankle prostheses.