Contact stresses in a patient-specific unicompartmental knee replacement

Heever, Dawie J. van den; Scheffer, Cornie; Erasmus, Pieter J.; Dillon, Edwin

doi:10.1016/j.clinbiomech.2010.09.007

Cited by 26 publications

(17 citation statements)

References 32 publications

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“…It was reported that the new mobile-bearing implant resulted in lower contact stresses in the tibiofemoral joint compared to the fixed-bearing implants. Moreover, lower stresses at the bone-implant interface were observed compared to other conventional implants [207]. A mobile bearing TKR was experimentally tested and numerically modeled using Patran and ABAQUS [208].…”

Section: Pathomechanical Modeling and Clinical Applicationsmentioning

confidence: 99%

Recent Advances in Computational Mechanics of the Human Knee Joint

Kazemi

Dabiri

2013

Computational and Mathematical Methods in Medicine

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Computational mechanics has been advanced in every area of orthopedic biomechanics. The objective of this paper is to provide a general review of the computational models used in the analysis of the mechanical function of the knee joint in different loading and pathological conditions. Major review articles published in related areas are summarized first. The constitutive models for soft tissues of the knee are briefly discussed to facilitate understanding the joint modeling. A detailed review of the tibiofemoral joint models is presented thereafter. The geometry reconstruction procedures as well as some critical issues in finite element modeling are also discussed. Computational modeling can be a reliable and effective method for the study of mechanical behavior of the knee joint, if the model is constructed correctly. Single-phase material models have been used to predict the instantaneous load response for the healthy knees and repaired joints, such as total and partial meniscectomies, ACL and PCL reconstructions, and joint replacements. Recently, poromechanical models accounting for fluid pressurization in soft tissues have been proposed to study the viscoelastic response of the healthy and impaired knee joints. While the constitutive modeling has been considerably advanced at the tissue level, many challenges still exist in applying a good material model to three-dimensional joint simulations. A complete model validation at the joint level seems impossible presently, because only simple data can be obtained experimentally. Therefore, model validation may be concentrated on the constitutive laws using multiple mechanical tests of the tissues. Extensive model verifications at the joint level are still crucial for the accuracy of the modeling.

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Section: Pathomechanical Modeling and Clinical Applicationsmentioning

confidence: 99%

Recent Advances in Computational Mechanics of the Human Knee Joint

Kazemi

Dabiri

2013

Computational and Mathematical Methods in Medicine

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“…For negative flexion and deep flexion, the contact pressure is higher than 60 MPa, which will lead to wear of the polyethylene components in total knee arthroplasties, a potential long-term problem. van den Heever et al analyzed the contact stresses in a patient-specific unicompartmental knee replacement [5]. The maximum contact stresses usually occurred at 45° flexion.…”

Section: Discussionmentioning

confidence: 99%

Biomechanical Assessment of a Patient-Specific Knee Implant Design Using Finite Element Method

Rong

Bai²,

Huang³

et al. 2014

BioMed Research International

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Rheumatoid arthritis is the leading cause of disability in young adults. Total knee arthroplasty has been successfully used to restore the joint function. Due to small bone size, osteoporosis, and severe soft tissue disease, standard knee implant sometimes cannot be directly applied clinically and patient-specific designs may be a more rational choice. The purpose of this study was to evaluate the biomechanical behavior of a patient-specific knee implant. A three-dimensional finite element of total knee arthroplasty was developed. The mechanical strength and the wear damage of the articular surfaces were analyzed. The results show that there exist high risks of component fracture and wear damage; the proposed implant design should be abandoned. The presurgery analysis is helpful in avoiding the potential failure.

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“…The three PS J-curves for the trochlear grooves and the medial and lateral condyles were generated in computer-aided design software with the reference of normal articular geometry of the subject in this study. 18 19 20 Planes were extracted into the condyles in the sagittal view, in which the curves were used to duplicate the surface geometry articulations (Figure 2 ). In general, a femur of a patient in the coronal plane provides asymmetric lateral and medial condyles: the coronal offset.…”

Section: Methodsmentioning

confidence: 99%

Malpositioning of Prosthesis: Patient-specific Total Knee Arthroplasty Versus Standard Off-the-Shelf Total Knee Arthroplasty

et al. 2017

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Introduction:A recent study has challenged the premise that a patient-specific (PS)–designed total knee arthroplasty (TKA) component has better clinical survival than an off-the-shelf (OTS) prosthesis.Methods:We developed the finite element models for PS TKA and OTS TKA with 5° varus and valgus malalignment and 5° internal and external malrotations.Results:Contact stress on the medial side of the insert increased with internal femoral malrotation and varus tibial malalignment, but it decreased with external femoral malrotation and varus tibial malalignment in both PS TKA and OTS TKA. An increase in ligament force occurred in valgus malalignment and external malrotation, and in particular, the force exerted on the medial collateral ligament increased. However, PS TKA provided better biomechanical effects than did the standard OTS TKA with malpositioning in TKA.Discussion:These results emphasize the importance of precise surgical preservation in regard to the TKA position.

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Contact stresses in a patient-specific unicompartmental knee replacement

Cited by 26 publications

References 32 publications

Recent Advances in Computational Mechanics of the Human Knee Joint

Recent Advances in Computational Mechanics of the Human Knee Joint

Biomechanical Assessment of a Patient-Specific Knee Implant Design Using Finite Element Method

Malpositioning of Prosthesis: Patient-specific Total Knee Arthroplasty Versus Standard Off-the-Shelf Total Knee Arthroplasty

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