Finite Element Analysis of Uncemented Total Hip Replacement: the Effect of Bone-Implant Interface

Ismail, Nur Faiqa; Shuib, Solehuddin; Yahaya, Mohd Azman; Romli, Ahmad Zafir; Shokri, Amran Ahmed

doi:10.14419/ijet.v7i4.26.22173

Cited by 7 publications

(1 citation statement)

References 12 publications

(19 reference statements)

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“…The viscoelastic properties of the femur bone may affect the amount of all three failure mechanisms of hip implants used as the objective functions including the stress shielding, initial relative micro-motion, and bone-implant interface stress. As another limitation, only the effect of the geometrical shape of the femoral stem was investigated on the three shape-dependent failure mechanisms, while the geometry and quality of the host bone and the surgical technique used for the implant fixation may also significantly affect these failure mechanisms (Abdul-Kadir et al 2008;Ismail et al 2018;Kanto et al 2020).…”

Section: Discussionmentioning

confidence: 99%

Multi-objective shape optimization of a cementless femoral stem using the MOPSO algorithm

Yazdi,

Kazemirad

2024

Preprint

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The geometrical shape of the femoral component of hip implants plays a key role in the long-term survivorship of hip implants. The aim of this study was to propose a multi-objective shape optimization procedure using the MOPSO algorithm with three shape-dependent failure mechanisms of hip implants as objective functions including the stress shielding, initial relative micro-motion, and bone-implant interface stress. The Taperloc® Complete femoral stem was selected and its reference geometry was defined with sixty-seven variables. Ten new stem shapes were produced as the swarm members by randomly changing the values of the variables. The values of the three objectives for each stem shape were calculated by the finite element analysis and the position of each swarm member was updated iteratively using the MOPSO algorithm. The geometry that caused a 37% and 33% decrease in the interface stress and stress shielding, respectively, and a 32% increase in the initial micro-motion compared to the Taperloc® Complete stem was selected as the optimized shape. It was shown that thinning the femoral stems without changing their length reduced the induced stress shielding and initial micro-motion and increased the interface stress, whereas shortening the femoral stems reduced the stress shielding and interface stress and increased the initial micro-motion. The proposed procedure may be conveniently used for the shape optimization of commercial femoral stems, which may significantly impact the performance and lifetime of hip implants.

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Section: Discussionmentioning

confidence: 99%

Multi-objective shape optimization of a cementless femoral stem using the MOPSO algorithm

Yazdi,

Kazemirad

2024

Preprint

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Study of Primary Stability of Hip Implant for Semi Hip Replacement by Using Finite Element Analysis

Abdullah,

Zakaria,

Talib

2024

Lecture Notes in Mechanical Engineering

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Calibration of Aseptic Loosening Simulation for Coatings Osteoinductive Effect

Baroni,

Oliviero,

La Mattina

et al. 2024

Ann Biomed Eng

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The risk of aseptic loosening in cementless hip stems can be reduced by improving osseointegration with osteoinductive coatings favoring long-term implant stability. Osseointegration is usually evaluated in vivo studies, which, however, do not reproduce the mechanically driven adaptation process. This study aims to develop an in silico model to predict implant osseointegration and the effect of induced micromotion on long-term stability, including a calibration of the material osteoinductivity with conventional in vivo studies. A Finite Element model of the tibia implanted with pins was generated, exploiting bone-to-implant contact measures of cylindrical titanium alloys implanted in rabbits’ tibiae. The evolution of the contact status between bone and implant was modeled using a finite state machine, which updated the contact state at each iteration based on relative micromotion, shear and tensile stresses, and bone-to-implant distance. The model was calibrated with in vivo data by identifying the maximum bridgeable gap. Afterward, a push-out test was simulated to predict the axial load that caused the macroscopic mobilization of the pin. The bone-implant bridgeable gap ranged between 50 μm and 80 μm. Predicted push-out strength ranged from 19 N to 21 N (5.4 MPa–3.4 MPa) depending on final bone-to-implant contact. Push-out strength agrees with experimental measurements from a previous animal study (4 ± 1 MPa), carried out using the same implant material, coated, or uncoated. This method can partially replace in vivo studies and predict the long-term stability of cementless hip stems.

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Finite Element Analysis of Uncemented Total Hip Replacement: the Effect of Bone-Implant Interface

Cited by 7 publications

References 12 publications

Multi-objective shape optimization of a cementless femoral stem using the MOPSO algorithm

Multi-objective shape optimization of a cementless femoral stem using the MOPSO algorithm

Study of Primary Stability of Hip Implant for Semi Hip Replacement by Using Finite Element Analysis

Calibration of Aseptic Loosening Simulation for Coatings Osteoinductive Effect

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