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Effect of Elevated Acetabular Cup on Contact and Failure Analysis in Hip Implants for Different Microseparations and Cup Inclinations Under Routine Gait Activities Using In Silico Approach

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Abstract

Objectives

The acetabular cup design plays a critical role in reducing contact stress between femur head acetabular cup. Many studies used ellipsoidal and spheroidal geometry in acetabular cup design to effectively reduce contact stress. The present study focuses on elevated acetabular cup rim with round corner design to reduce contact stress with round corner geometry.

Methods

The cobalt chromium femur head and cup are considered for finite element (FE) model of hip resurfacing. The gait loads of routine activities of humans like normal walking, stair ascending and descending and sitting down and getting up gait activities are applied to the developed 3D FE model. Five microseparations of 0.5, 1, 1.5, 2 and 2.5 mm are considered in the present study. The acetabular cup inclination angle considered for this study are 35°, 45°, 55°, 65° and 75°. The contact stress and von Mises stress plot for each gait activities under these microseparations are analyzed for betterment of longevity of implants.

Results

Overall elevated cup rim design helped in reducing contact stress to a greater extent than conventional cup with different geometries. Also, the predicted von Mises stress for all the parameters considered in the current study are well within the yield strength of CoCr material. Therefore, elevated cup rim could be used as a better alternative to spline and, ellipsoidal and circular geometries of cup.

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Authors and Affiliations

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

    R. Nithyaprakash, S. Shankar, A. J. Kirthik Raja, R. Gokul Anand & G. Abbas

  2. Department of Mechanical Engineering, Kongu Engineering College, Erode, Tamil Nadu, India

    R. Naveenkumar

  3. Pro-Vice Chancellor, Research & Development, Chitkara University, Chandigarh, Punjab, India

    Chander Prakash

  4. School of Civil and Mechanical Engineering, Curtin University, Bentley, WA, Australia

    Alokesh Pramanik

  5. Adelaide Microscopy, The University of Adelaide, Adelaide, SA, 5005, Australia

    Animesh Kumar Basak

  6. Chitkara Centre for Research and Development, Chitkara University, Himachal Pradesh, 174103, India

    S. Shankar

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  1. R. Nithyaprakash
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Correspondence to R. Nithyaprakash.

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Conflict of Interest

R. Nithyaprakash, S. Shankar, R. Naveenkumar, A.J. Kirthik Raja, R.Gokul Anand, G.Abbas, Chander Prakash, Alokesh Pramanik, Animesh Kumar Basak declare that they have no conflict of interest.

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Nithyaprakash, R., Shankar, S., Naveenkumar, R. et al. Effect of Elevated Acetabular Cup on Contact and Failure Analysis in Hip Implants for Different Microseparations and Cup Inclinations Under Routine Gait Activities Using In Silico Approach. JOIO (2024). https://doi.org/10.1007/s43465-024-01146-y

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