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The performance of hip joint replacement procedures heavily relies on the mechanical integrity and stability of the implanted acetabular shell. Recent studies indicate that stiffness results in heightened stress peaks around the acetabular rim, leading to stress shielding. Using the finite element (FE) method, we investigated load transfer and estimated, shell deformation, micromotion between bone and implant interface, stress patterns in subchondral bone for acetabular shell made of titanium (Ti-6Al-4V) and cobalt chromium (CoCr) alloys during routine activities. The Ti-6Al-4V shell exhibited the highest deformation during stair climbing (286 μm), followed by standing up (229 μm) and sitting down (186 μm), whereas the CoCr shell consistently demonstrated reduced deformation in all activities. Subsequent analysis showed higher subchondral stress and micromotion in Ti-6Al-4V shell-bone interface during stair climbing (23.97 MPa and 0.941 μm) and lower values during sitting down (14.46 MPa and 0.686 μm) for the CoCr shell. Shell material influenced the stress distribution in adjoining bone and micromotion emphasizing the significant influence of metal shell stability and guiding advancements in cup design and loading protocols for sustained efficacy.

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Comparative Investigation of Ti-6Al-4V and CoCr Alloys Acetabular Shells on Stability During Routine Activities-A Computational Approach

  • 会议论文

  • 发表日期：

    2026年

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  • Jitendra Kumar,
  • Nitesh Kumar Singh,
  • Sravana Swathi Vardhiparthi,
  • Rati Verma,
  • Nishant Kumar Singh

摘要

The performance of hip joint replacement procedures heavily relies on the mechanical integrity and stability of the implanted acetabular shell. Recent studies indicate that stiffness results in heightened stress peaks around the acetabular rim, leading to stress shielding. Using the finite element (FE) method, we investigated load transfer and estimated, shell deformation, micromotion between bone and implant interface, stress patterns in subchondral bone for acetabular shell made of titanium (Ti-6Al-4V) and cobalt chromium (CoCr) alloys during routine activities. The Ti-6Al-4V shell exhibited the highest deformation during stair climbing (286 μm), followed by standing up (229 μm) and sitting down (186 μm), whereas the CoCr shell consistently demonstrated reduced deformation in all activities. Subsequent analysis showed higher subchondral stress and micromotion in Ti-6Al-4V shell-bone interface during stair climbing (23.97 MPa and 0.941 μm) and lower values during sitting down (14.46 MPa and 0.686 μm) for the CoCr shell. Shell material influenced the stress distribution in adjoining bone and micromotion emphasizing the significant influence of metal shell stability and guiding advancements in cup design and loading protocols for sustained efficacy.