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Related Concept Videos

Stress Concentrations in Circular Shafts01:18

Stress Concentrations in Circular Shafts

Consider the elastic torsion formula, which applies to a circular shaft with a consistent cross-section. This formula assumes that the shaft's ends are loaded with rigid plates firmly attached. However, in many cases, torques are applied to the shaft through mechanisms like flange couplings or gears, which are connected by keys inserted into keyways. This application method modifies the stress distribution near the point of torque application, causing it to deviate from the distributions...
Bearing Stress01:22

Bearing Stress

Bearing stress refers to the contact pressure between two separate bodies. To visualize this, imagine a bolt thrust through a plate. The bolt applies a force to the plate, which exerts an equal but opposite force back onto the bolt. This force isn't just a singular entity but a compilation of numerous smaller forces distributed across the contact surface between the bolt and the plate.
Due to the intricacy of these microforces, an average value, known as bearing stress, is often used by...
Design of Transmission Shafts - Stress Analysis01:15

Design of Transmission Shafts - Stress Analysis

Designing a transmission shaft requires a thorough understanding of the stresses induced by bending moments and torques, especially in systems where power is transferred through gears. These forces create force-couple systems at the centers of the shaft's cross-sections, leading to both transverse and torsional loading. Although shearing stresses from transverse loads are typically smaller than those from torques and are often overlooked, the significant normal stresses from these loads...
Residual Stresses in Circular Shafts01:10

Residual Stresses in Circular Shafts

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 shaft's...

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Related Experiment Video

Updated: Jul 8, 2026

The Transition to an Anterior-Based Muscle Sparing Approach Improves Early Postoperative Function but is Associated with a Learning Curve
09:51

The Transition to an Anterior-Based Muscle Sparing Approach Improves Early Postoperative Function but is Associated with a Learning Curve

Published on: September 7, 2022

Retroacetabular stress-shielding in THA.

Rocco P Pitto1, Akanksha Bhargava, Salil Pandit

  • 1Department of Orthopaedic Surgery, Middlemore Hospital, South Auckland Clinical School, University of Auckland, Auckland, New Zealand.

Clinical Orthopaedics and Related Research
|January 16, 2008
PubMed
Summary

Total hip arthroplasty with press-fit cups showed significant bone density loss in the cancellous bone, regardless of liner material. Cortical bone density remained largely unchanged, suggesting altered stress distribution after surgery.

More Related Videos

Individualized Stem-positioning in Calcar-guided Short-stem Total Hip Arthroplasty
09:31

Individualized Stem-positioning in Calcar-guided Short-stem Total Hip Arthroplasty

Published on: February 27, 2018

Related Experiment Videos

Last Updated: Jul 8, 2026

The Transition to an Anterior-Based Muscle Sparing Approach Improves Early Postoperative Function but is Associated with a Learning Curve
09:51

The Transition to an Anterior-Based Muscle Sparing Approach Improves Early Postoperative Function but is Associated with a Learning Curve

Published on: September 7, 2022

Individualized Stem-positioning in Calcar-guided Short-stem Total Hip Arthroplasty
09:31

Individualized Stem-positioning in Calcar-guided Short-stem Total Hip Arthroplasty

Published on: February 27, 2018

Area of Science:

  • Orthopedic Surgery
  • Biomaterials Science
  • Radiology

Background:

  • Total hip arthroplasty (THA) is a common procedure to address hip joint degeneration.
  • Press-fit acetabular components are widely used, but their long-term effects on periacetabular bone are still under investigation.
  • Liner materials may influence bone remodeling around the implant.

Purpose of the Study:

  • To compare periacetabular bone density changes after THA using press-fit components with soft (polyethylene) and hard (alumina ceramic) liner materials.
  • To assess the impact of different liner materials on bone remodeling around acetabular components.
  • To evaluate the pattern of bone density changes in cancellous versus cortical bone.

Main Methods:

  • A randomized clinical trial involving 40 patients undergoing THA with press-fit cups.
  • Comparison between alumina ceramic liners (n=20) and highly cross-linked polyethylene liners (n=20).
  • Quantitative computed tomography (CT)-assisted osteodensitometry was used to measure bone density changes at the periacetabular region, with the contralateral side serving as control. Scans were performed postoperatively and at 1-year follow-up.

Main Results:

  • No significant difference in periacetabular bone density changes was observed between the alumina ceramic and polyethylene liner groups at 1-year follow-up.
  • A marked decrease in periacetabular cancellous bone density (up to -34%) was found in both cohorts.
  • Moderate changes were observed in cortical bone density, with a general trend of preservation compared to cancellous bone.

Conclusions:

  • The choice between alumina ceramic and highly cross-linked polyethylene liners does not appear to significantly affect periacetabular bone density changes in press-fit THA at 1 year.
  • Significant loss of cancellous bone density around the acetabular component is a common finding after THA with press-fit fixation.
  • The observed pattern of cancellous bone loss with relative preservation of cortical bone suggests a stress shielding or stress redistribution phenomenon following total hip arthroplasty.