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Related Concept Videos

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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Eccentric Axial Loading in a Plane of Symmetry01:16

Eccentric Axial Loading in a Plane of Symmetry

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Eccentric axial loading occurs when an axial load is applied away from the centroidal axis of a structural member. This scenario is common in engineering, where structural elements may not be directly aligned due to various design or functional requirements.
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Stability of structures01:14

Stability of structures

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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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Residual Stresses in Bending01:18

Residual Stresses in Bending

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In the study of elastoplastic members subjected to bending moments, understanding the loading and unloading phases is crucial for assessing material behavior and structural integrity. During the loading phase, as the bending moment increases, the material initially responds elastically, adhering to Hooke's Law, where stress is directly proportional to strain. When the load exceeds the yield strength, plastic deformation occurs, resulting in permanent strain and deformation that remains even...
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Behavior of Concrete Under Compressive Load01:23

Behavior of Concrete Under Compressive Load

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Concrete exhibits specific behaviors under different compressive loads. Understanding this is crucial for understanding its structural integrity. When concrete undergoes uniaxial compression, it tends to develop cracks that run parallel to the direction of the force. These parallel cracks stem from localized tensile stresses that occur perpendicular to the compression direction. Additionally, angled cracks may appear due to the formation of shear planes.
As the concrete specimen fractures under...
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General Case of Eccentric Axial Loading01:12

General Case of Eccentric Axial Loading

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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.
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Related Experiment Video

Updated: Mar 3, 2026

In Vitro Application of a Wireless Sensor in Flexion-Extension Gap Balance of Unicompartmental Knee Arthroplasty
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Initial Stability of Cemented vs Cementless Tibial Components Under Cyclic Load.

Paul D Crook1, John R Owen1, Shane R Hess1

  • 1Department of Orthopaedic Surgery, Virginia Commonwealth University, Richmond, Virginia.

The Journal of Arthroplasty
|April 24, 2017
PubMed
Summary

Cemented tibial baseplates show superior initial stability compared to cementless options. While cementless fixation may have slightly higher micromotion, the difference is likely subclinical, suggesting potential for comparable long-term outcomes in total knee replacement.

Keywords:
arthroplastycementedcementlesskneetotal knee arthroplasty

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Area of Science:

  • Orthopedic surgery
  • Biomechanical engineering
  • Biomaterials science

Background:

  • Cement fixation is the standard for total knee replacement components, though cementless fixation is gaining traction for durable, long-term stability.
  • Achieving initial stability is critical for successful bony ingrowth in cementless implants.
  • Understanding the biomechanical differences between cemented and cementless fixation is essential for optimizing total knee arthroplasty outcomes.

Purpose of the Study:

  • To compare the initial mechanical stability of cemented versus cementless tibial baseplates in a simulated physiological loading environment.
  • To quantify micromotion at multiple locations around the tibial baseplate under cyclic loading.
  • To assess the clinical relevance of observed micromotion differences between fixation methods.

Main Methods:

  • Twelve cemented and cementless tibial baseplates were implanted into sawbones.
  • A physiological medial-lateral load distribution was applied for 10,000 cycles, simulating 8 weeks of in vivo function.
  • Micromotion was measured at five distinct locations around the baseplate periphery during the loading cycles.

Main Results:

  • Cyclic loading significantly affected micromotion changes at all tested locations (anterior, medial, lateral, posteromedial, posterolateral).
  • Fixation technique significantly impacted micromotion at the anterior, medial, and lateral edges, but not posteromedially or posterolaterally.
  • Differences in micromotion between cemented and cementless components remained below 150 μm across all tested locations.

Conclusions:

  • Cementless tibial components exhibited potentially lower initial mechanical stability compared to cemented components.
  • The observed micromotion differences between cemented and cementless fixation were minimal (<150 μm).
  • These subclinical differences suggest that cementless fixation may still achieve adequate initial stability for successful total knee arthroplasty.