Effects of the material properties of a focal knee articular prosthetic on the human knee joint using computational simulation

Koh, Yong‐Gon; Lee, Jin-Ah; Kim, Paul Shinil; Kim, Hyo-Jeong; Kang, Kiwon; Kang, Kyoung‐Tak

doi:10.1016/j.knee.2020.08.001

Cited by 4 publications

(2 citation statements)

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“…It is important to note the limitation of the approach to assessing prosthesis fatigue resistance. Fatigue failure is a very complex phenomenon for composite materials, which can be formed by different failure modes [9]. Our study assumes that the rupture of the prosthesis occurs at the level of the third section.…”

Section: Results Analysismentioning

confidence: 99%

Numerical Approach to Predict the Lifespan of a Prosthesis

Tlili¹,

Guizani²,

Aouadi³

2020

BJSTR

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This study consists of modeling and simulating the behavior of a prosthetic leg adapted to running using the finite element method, therefore the work is divided into three phases. In the first stage, the study is focused on the modeling of prostheses and their contact with the ground, followed by a phase of simulation of its behavior. The final phase of this work is oriented to the study of the influencing factors on the overall behavior of the prosthesis: number of folds, mechanical properties and an estimate of the service life. The evaluation is determined on the uncertainty of the stresses due to modeling errors, and the dispersion of the data obtained from the fatigue tests [1]. The results indicate that the accuracy of the prosthesis fatigue assessment is strongly related to the accuracy of the stress estimation. Additionally, a relationship between the probability of fatigue failure and the number of stroke cycles has been suggested, in order to provide a benchmark for prosthetics to determine the time interval for prosthesis inspection.

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Section: Results Analysismentioning

confidence: 99%

Numerical Approach to Predict the Lifespan of a Prosthesis

Tlili¹,

Guizani²,

Aouadi³

2020

BJSTR

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“…We applied the same conditions for intact model validation and clinically relevant loading scenarios for the focal knee arthroplasty models. These methods have previously been reported in Koh et al 19 The bottom of the tibial bone was constrained in all translational and rotational degrees of freedom, while the femur was only restricted in knee flexion, which was fixed at 0° to simulate the short-term gait load of a human knee joint in full extension. A reference point, located in the central region between the lateral and medial femoral epicondyles, was coupled to the femoral surface using the constraint method ( Figure 3 ).…”

Section: Methodsmentioning

confidence: 99%

Effect of surface matching mismatch of focal knee articular prosthetic on tibiofemoral contact stress using finite element analysis

Lee,

Koh,

Kim

et al. 2023

Bone Joint Res

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AimsFocal knee arthroplasty is an attractive alternative to knee arthroplasty for young patients because it allows preservation of a large amount of bone for potential revisions. However, the mechanical behaviour of cartilage has not yet been investigated because it is challenging to evaluate in vivo contact areas, pressure, and deformations from metal implants. Therefore, this study aimed to determine the contact pressure in the tibiofemoral joint with a focal knee arthroplasty using a finite element model.MethodsThe mechanical behaviour of the cartilage surrounding a metal implant was evaluated using finite element analysis. We modelled focal knee arthroplasty with placement flush, 0.5 mm deep, or protruding 0.5 mm with regard to the level of the surrounding cartilage. We compared contact stress and pressure for bone, implant, and cartilage under static loading conditions.ResultsContact stress on medial and lateral femoral and tibial cartilages increased and decreased, respectively, the most and the least in the protruding model compared to the intact model. The deep model exhibited the closest tibiofemoral contact stress to the intact model. In addition, the deep model demonstrated load sharing between the bone and the implant, while the protruding and flush model showed stress shielding. The data revealed that resurfacing with a focal knee arthroplasty does not cause increased contact pressure with deep implantation. However, protruding implantation leads to increased contact pressure, decreased bone stress, and biomechanical disadvantage in an in vivo application.ConclusionThese results show that it is preferable to leave an edge slightly deep rather than flush and protruding.Cite this article: Bone Joint Res 2023;12(8):497–503.

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