Initial damage analysis in bone cement-stem debonding procession of cemented hip arthropsty

Zhang, Lanfeng; Liu, Hongtao; Chen, Tianchi; Feng, Yong

doi:10.1016/j.matdes.2022.111486

Cited by 2 publications

(1 citation statement)

References 40 publications

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“…Most of the research works done in the field of hip implants shape optimization with the objective of minimizing the interface stress was performed on the cemented stems (Higa et al 2002;Higa et al 2015;Ishida et al 2003; Kayabasi and Ekici 2007;Tanino et al 2006). The debonding in the cement-stem interface is the most important reason for the loosening and subsequent failure of the cemented stems (Zhang et al 2023). However, the interface stress may also affect the survival of cementless stems and cause the separation of the biological fixation between the stem and the bone (Chanda et al 2016b).…”

Section: Introductionmentioning

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: Introductionmentioning

confidence: 99%

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

Yazdi,

Kazemirad

2024

Preprint

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Biomechanical Analysis of Femoral Stem Features in Hinged Revision TKA with Valgus or Varus Deformity: A Comparative Finite Elements Study

Bori

Innocenti

2023

Applied Sciences

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Hinged total knee arthroplasty (TKA) is a valid option to treat patients during revision of an implant; however, in case of varus/valgus deformity, the force transmission from the femur to the tibia could be altered and therefore the performance of the implant could be detrimental. To be able to evaluate this, the goal of this study was to investigate, using a validated finite element analysis, the effect of varus/valgus load configurations in the bones when a hinged TKA is used. In detail, short and long stem lengths (50 mm, and 120 mm), were analyzed both under cemented or press-fit fixation under the following varus and valgus deformity: 5°, 10°, 20°, and 30°. The main outputs of the study were average bone stress in different regions of interest, together with tibio-femoral contact pressure and force. Results demonstrated that changes in the varus or valgus deformity degrees induce a change in the medio-lateral stress and force distribution, together with a change in the contact area. The effect of stem length and cement do not alter the tibio-femoral contact biomechanics but its effect is mainly localized in the distal femoral region, and it is negligible in the proximal regions.

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Initial damage analysis in bone cement-stem debonding procession of cemented hip arthropsty

Cited by 2 publications

References 40 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

Biomechanical Analysis of Femoral Stem Features in Hinged Revision TKA with Valgus or Varus Deformity: A Comparative Finite Elements Study

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