Three-dimensional structural optimization of a cementless hip stem using a bi-directional evolutionary method

Rahchamani, Reza; Soheilifard, Reza

doi:10.1080/10255842.2019.1661387

Cited by 14 publications

(9 citation statements)

References 39 publications

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“…The use of a trabecular-like stochastic porous structure in this study is potentially advantageous compared to more regular lattice designs as stochastic structures enable control of anisotropy [ 42 ], which may result in an implant that is more tolerant to unanticipated load cases. Other researchers have optimised the outer shape of hip implants [ 5 , 43 , 44 , 45 , 46 , 47 , 48 ], or optimised the modulus/density distribution within implants [ 49 , 50 ], with similar proposed benefits for preventing strain shielding. However, to the authors’ knowledge, this is the first paper to demonstrate that a strain shielding reduction can be gained by selectively hollowing the implant using topology optimisation with multiple load cases, and the first to additively manufacture and test a proof-of-concept device.…”

Section: Discussionmentioning

confidence: 99%

Topology Optimisation for Compliant Hip Implant Design and Reduced Strain Shielding

Tan

Arkel

2021

Materials

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Stiff total hip arthroplasty implants can lead to strain shielding, bone loss and complex revision surgery. The aim of this study was to develop topology optimisation techniques for more compliant hip implant design. The Solid Isotropic Material with Penalisation (SIMP) method was adapted, and two hip stems were designed and additive manufactured: (1) a stem based on a stochastic porous structure, and (2) a selectively hollowed approach. Finite element analyses and experimental measurements were conducted to measure stem stiffness and predict the reduction in stress shielding. The selectively hollowed implant increased peri-implanted femur surface strains by up to 25 percentage points compared to a solid implant without compromising predicted strength. Despite the stark differences in design, the experimentally measured stiffness results were near identical for the two optimised stems, with 39% and 40% reductions in the equivalent stiffness for the porous and selectively hollowed implants, respectively, compared to the solid implant. The selectively hollowed implant’s internal structure had a striking resemblance to the trabecular bone structures found in the femur, hinting at intrinsic congruency between nature’s design process and topology optimisation. The developed topology optimisation process enables compliant hip implant design for more natural load transfer, reduced strain shielding and improved implant survivorship.

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Section: Discussionmentioning

confidence: 99%

Topology Optimisation for Compliant Hip Implant Design and Reduced Strain Shielding

Tan

Arkel

2021

Materials

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“…Also, the femur bone's apparent density estimation formula using CT data's Hounsfield value, reported by Ghosh et al, 17 Zhang et al, 18 Behrens et al, 19 Rahchamani et al 20 and Lerch et al 21 as expressed in eqn (3).…”

Section: Experimental Methods and Boundary Conditions For Assessing H...mentioning

confidence: 99%

Advancement in total hip implant: a comprehensive review of mechanics and performance parameters across diverse novelties

Soliman,

Islam,

Chowdhury

et al. 2023

J. Mater. Chem. B

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“…Based on the finite element method, Ali et al optimized the three geometric parameters including ball diameter, neck length and stem length of the AHJ, and the materials of ball and stem were also considered at the same time 15 . Rahchamani and soheilifard proposed a numerical strategy for the optimization of the stem geometry based on a bi‐directional evolutionary structural optimization method 16 . Ruben et al proposed a multi‐criteria optimization model to obtain the optimal geometry of the femoral component 17 .…”

Section: Introductionmentioning

confidence: 99%

“…15 Rahchamani and soheilifard proposed a numerical strategy for the optimization of the stem geometry based on a bi-directional evolutionary structural optimization method. 16 Ruben et al proposed a multi-criteria optimization model to obtain the optimal geometry of the femoral component. 17 Fraldi et al proposed a maximum stiffness topology optimization strategy to reduce the stress shielding phenomenon in the femur.…”

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confidence: 99%

Non‐spherical shape optimization of artificial hip joint based on elastohydrodynamic lubrication analysis

Zhang

et al. 2023

J of Applied Polymer Sci

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Structural optimization design is a promising way to further promote the lubrication performance of the artificial hip joint (AHJ). In this work, a non‐spherical shape optimization design strategy for the femoral head is firstly proposed. The generatrix, the line rotated about an axis that generates the bearing surface of the femoral head, is characterized based on a third‐order Bezier curve. The performance of the AHJ under steady‐state condition is analyzed by solving the governing equations of the elastohydrodynamic lubrication problem, and the minimum lubricating film thickness of the AHJ is maximized by adjusting the positions of four control points of the Bezier curve based on the simulated annealing method. The results show that, when compared with the standard spherical femoral head, the optimized non‐spherical femoral head can significantly improve the minimum thickness and reduce the maximum pressure of the lubricating film of the AHJ. Through the analysis of the optimization process, the results further reveal that the shape of the femoral head has a direct impact on the thickness distribution of the lubricating film. This research will provide guidance and theoretical support for novel design of AHJs.

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Three-dimensional structural optimization of a cementless hip stem using a bi-directional evolutionary method

Cited by 14 publications

References 39 publications

Topology Optimisation for Compliant Hip Implant Design and Reduced Strain Shielding

Topology Optimisation for Compliant Hip Implant Design and Reduced Strain Shielding

Advancement in total hip implant: a comprehensive review of mechanics and performance parameters across diverse novelties

Non‐spherical shape optimization of artificial hip joint based on elastohydrodynamic lubrication analysis

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