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Related Experiment Video

Updated: Jun 25, 2025

Imaging of the Microstructural Failure Mechanism in the Human Hip
08:43

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Published on: September 29, 2023

826

Effect of Elevated Acetabular Cup on Contact and Failure Analysis in Hip Implants for Different Microseparations and

R Nithyaprakash1, S Shankar1,2, R Naveenkumar3

  • 1Department of Mechatronics Engineering, Kongu Engineering College, Erode, Tamil Nadu India.

Indian Journal of Orthopaedics
|May 30, 2024
PubMed
Summary

An elevated acetabular cup rim design significantly reduces contact stress in hip resurfacing implants. This improved design, using round corner geometry, offers a better alternative to conventional cup designs for enhanced implant longevity.

Keywords:
Contact stressCup inclinationElevated cupHip resurfacingMicroseparation

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Area of Science:

  • Biomedical Engineering
  • Orthopedic Surgery
  • Materials Science

Background:

  • Acetabular cup design is crucial for minimizing contact stress in hip implants.
  • Ellipsoidal and spheroidal geometries have been explored to reduce stress.
  • This study investigates an elevated acetabular cup rim with round corners.

Purpose of the Study:

  • To evaluate the effectiveness of an elevated acetabular cup rim with round corner geometry in reducing contact stress.
  • To compare the performance of this novel design against conventional acetabular cup geometries.
  • To analyze stress distribution under various physiological loading conditions.

Main Methods:

  • A 3D finite element (FE) model of a cobalt chromium hip resurfacing implant was developed.
  • Gait loads simulating walking, stair negotiation, and sit-to-stand activities were applied.
  • Microseparations (0.5-2.5 mm) and inclination angles (35°-75°) were analyzed.

Main Results:

  • The elevated cup rim design demonstrated a significant reduction in contact stress compared to conventional designs.
  • Von Mises stress values remained within the yield strength of the cobalt chromium material across all tested parameters.
  • The elevated rim design proved superior to spline, ellipsoidal, and circular geometries.

Conclusions:

  • An elevated acetabular cup rim with round corner geometry is a promising design for reducing contact stress in hip resurfacing.
  • This design offers a potential improvement for the longevity of hip implants.
  • The findings support the elevated rim design as a superior alternative to existing acetabular cup geometries.