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Related Concept Videos

Residual Stresses in Circular Shafts01:10

Residual Stresses in Circular Shafts

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In materials that exhibit elastic and plastic behavior, known as elastoplastic materials, residual stresses can accumulate when these materials experience plastic deformation. This deformation arises from either high levels of shearing stress or significant strains. Residual stresses are internal stresses that persist within a material after removing the external force causing deformation. This phenomenon is demonstrated when observing the behavior of a shaft under torque; notably, the...
433
Stability of structures01:14

Stability of structures

388
In mechanical engineering, the stability of systems under various forces is critical for designing durable and efficient structures. One fundamental way to explore these concepts is by analyzing systems like two rods connected at a pivot point, O, with a torsional spring of spring constant k at the pivot point. This system is similar in appearance to a scissor jack used to change tires on a car. In this case, the arms of the linkage (equivalent to the rods in this system) are entirely vertical,...
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Applications of Stress01:04

Applications of Stress

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Consider a structure made of a boom and a rod designed to support a load. These two components are connected by a pin and stabilized by brackets and pins. The boom and the rod are detached from their supports to assess the different stresses imposed on this structure, and a free-body diagram is drawn. Then, all the forces applied, including the load acting on the structure, are identified. The reaction forces exerted on both the boom and the rod are computed using the equilibrium equations.
The...
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Plastic Deformations of Members with a Single Plane of Symmetry01:21

Plastic Deformations of Members with a Single Plane of Symmetry

276
When a structural member undergoes plastic deformation due to bending, it is crucial to understand the position of the neutral axis and the stress distribution. This member, characterized by a single plane of symmetry, exhibits a uniform stress distribution, with negative stress above the neutral axis and positive stress below. Notably, the neutral axis does not align with the centroid of the cross-section. This misalignment is typical in cases where the cross-section is not rectangular or...
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Normal Strain under Axial Loading01:20

Normal Strain under Axial Loading

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Normal strain under axial loading is an important concept in the field of mechanics of materials. Axial loading implies the application of a force along the axis of a material, like a column or bar. This force can either compress or stretch the material. In the context of axial loading, normal strain is the deformation experienced by the material in the direction of the loading force. It's calculated as the change in length divided by the original length of the material. This unitless ratio...
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Plastic Deformation in Circular Shafts01:20

Plastic Deformation in Circular Shafts

385
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: Dec 19, 2025

Individualized Stem-positioning in Calcar-guided Short-stem Total Hip Arthroplasty
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Primary stability analysis of stemless shoulder implants.

C Quental1, J Folgado1, M Comenda1

  • 1IDMEC, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1 1049-001 Lisboa, Portugal.

Medical Engineering & Physics
|June 9, 2020
PubMed
Summary
This summary is machine-generated.

Primary stability of stemless shoulder implants is crucial for osseointegration. The Eclipse and Global Icon designs showed the best initial stability, with Global Icon offering a good long-term balance.

Keywords:
Finite element methodMicromotionsOsseointegrationPrimary stabilityShoulder arthroplastyStemless implants

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Area of Science:

  • Orthopedic biomechanics
  • Biomaterials science

Background:

  • Primary implant stability is essential for successful osseointegration in joint replacements.
  • Limited data exists on primary stability for stemless shoulder implants.

Purpose of the Study:

  • To evaluate the primary stability of five stemless shoulder implant designs using 3D finite element analysis.
  • To assess the influence of bone quality on implant stability.

Main Methods:

  • Utilized 3D finite element models for five stemless designs (Sidus, SMR, Simpliciti, Eclipse, Global Icon).
  • Simulated three cancellous bone quality conditions and analyzed micromotions at bone-implant interfaces under eight load cases.
  • Investigated contact conditions for designs without a collar.

Main Results:

  • All designs showed <150 µm micromotions in good bone quality.
  • Eclipse and Global Icon designs were least affected by bone quality variations.
  • Designs with a collar or humeral head-bone contact demonstrated enhanced stability.

Conclusions:

  • Eclipse-based and Global Icon-based designs exhibited superior primary stability.
  • The Global Icon design may offer a better long-term option due to its balance of primary stability and bone adaptation potential.