Multiobjective shape optimization strategy to increase performance of hollow stems used in artificially replaced hip joints

Ghias Kharmanda, Imad Antypas, Alexey Dyachenko

Research output: Contribution to journalArticlepeer-review

8 Citations (SciVal)

Abstract

The artificial replaced hip joint represents the major success story in orthopedic surgery in the twentieth century; there is much interest in extending research on hip joint even further. The stress distribution in the different bone tissues of a femur is significantly altered after an artificial replacement. Thus, there is a strong need to increase the prosthesis performance considering several criteria. A new multiobjective shape ptimization strategy is presented to increase the performance of the hollow stems used in the artificially replaced hip joints. Two stem models are considered in this study: solid and hollow stems. The shape optimization presents the detailed design stage when studying the hip prostheses in order to improve their performance. Several objectives are considered, that leads to develop a new multiplicative formulation as a performance scale to define the best compromise between several requirements. Numerical applications considering several daily loading cases, is presented out to show the advantages of the hollow stem model relative to the solid one. When considering the hollow stem, the developed multiobjective function is reduced almost 46% relative to the solid stem. It is shown that from an optimization of the stress levels using a new goal function and considering several daily loading ases, it is concluded that it is possible to obtain a more uniform stress distribution. In addition, it is found that a significant increase of the stress levels around the metal/bone interface is obtained, leading to favorable remodeling process.

Original languageEnglish
Pages (from-to)810-820
JournalInternational Journal of Mechanical Engineering and Technology
Volume9
Issue number11
Publication statusPublished - 2018 Nov

Subject classification (UKÄ)

  • Mechanical Engineering

Keywords

  • Hip prosthesis
  • Hollow stem
  • Shape optimization
  • Solid stem

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