Finite element study on the predicted equivalent stresses in the artificial hip joint

Monif, Mamdouh M.

doi:10.4236/jbise.2012.52007

Cited by 12 publications

(2 citation statements)

References 27 publications

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“…when there is no wear) UHMWPE cup -metallic head combination with the cup inclination of 458, the current FE prediction in terms of contact pressure and von Mises stress was compared and justified with the FE analyses studied in Monif (2012), Fuod (2010) and Fuod (2011, and the prediction errors were within 1 -2%. For instance, Fouad (2011) examined von Mises stress in the UHMWPE cup under the same load and similar geometric conditions (except for cup thickness), and reported a maximum von Mises stress of 26.8 MPa.…”

Section: Discussionmentioning

confidence: 99%

Contact of dual mobility implants: effects of cup wear and inclination

Uddin

2014

Computer Methods in Biomechanics and Biomedical Engineering

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Cup wear and inclination on the pelvic bone are significant factors, which change the contact of the articulating surfaces, thus, impacting the long-term performance of hip implants. This paper presents a finite element (FE) analysis of the contact of the dual mobility implants under the influence of cup wear and inclination. A 3D FE model of the implant was developed with the application of equivalent physiological loading and boundary conditions. Effects of cup inclination angle ranging from 45° to 60° and the wear depth ranging from 0 to 2.46 mm equivalent to up to 30 years of the implant's life on the contact pressure and von Mises stress were investigated. Simulation results show that the contact pressure and von Mises stress decrease significantly with a modest wear depth and remains quite in-sensitive to the cup inclination angle and wear depth up to 1.64 mm. With wear depth further up to 2.46 mm, the cup thickness (i.e. cup thinning on worn region) may be more predominant than increasing of contact area between the cup and the head. The wear on the inner surface of the cup is found to rule out the overall contact pressure and stress in the implant. Furthermore, individual and combined effects of both important parameters are analysed and discussed with respect to available clinical/laboratory studies.

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Section: Discussionmentioning

confidence: 99%

Contact of dual mobility implants: effects of cup wear and inclination

Uddin

2014

Computer Methods in Biomechanics and Biomedical Engineering

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“…In biomechanics, systems of partial differential equations are solved on any three-dimensional (configuration), including anatomical areas with various mechanical properties, using a numerical technique called the finite element method (FEM). In order to investigate the mechanical behavior of the DM joint and more accurately incorporate its mechanical properties, several FEM models have been developed from 3D models [17][18][19][20]. These finite element models for predicting damage risks require improvement in order to foresee the risks of damage to bone cement and to correctly assess the risks of prosthesis loosening [21][22][23][24][25].Utilizing the experimental design methodology, stresses in bone cement are modeled and predicted.…”

Section: Introductionmentioning

confidence: 99%

Optimization and the Impact of Various Factors on the Orthopedic Cement Used in the Total Hip Arthroplasty

Djenaoui,

Boutabout,

Bouziane

et al. 2023

JBBBE

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The aim of the present investigation is to determine the ideal values for several parameters, such as the external diameter of the polyethylene liner, the Young's modulus of the cup, and the friction coefficients between the polyethylene liner's contact area and the acetabular shell and prosthetic head of the dual-mobility cup. Reduced stresses at the bone/cement interface are crucial for ensuring a well-fixed dual-mobility cup (DMC) with the acetabulum because orthopedic cement (PMMA) is the weakest component of total hip arthroplasty (THA). Four factors, such as the PE liner size, the rigidity of the cup, and the friction coefficients, are optimized using the three-dimensional finite element method (FEM) and experimental design approach (EDA). The numerical results show that the hemispherical-liner size, mechanical characteristics of the cup, surface state of the femoral head, liner PE, and shell components all influence the mechanical strength of the bone cement. To prevent fracturing the bone cement, which would render the total hip arthroplasty ineffective. The optimal values of the maximum von Mises stress in bone cement will be determined using this methodology. The numerical outcome shows that when the Young's modulus of the cup rises, the maximum stress in bone cement falls until it reaches a minimal value. The maximum stress in bone cement, however, increases as the PE liner's exterior diameter increases. Because the maximum stress is still below the yield stress of bone cement, the artificial hip joint is still considered safe despite the increased stress value.

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Analysis of Femoral Components of Cemented Total Hip Arthroplasty

Singh

Harsha

2015

J. Inst. Eng. India Ser. D

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In cemented Total Hip Arthroplasty (THA), material chosen for femoral stem and cross section of stem itself, proved to be critical parameters for, stress distribution in the femoral components, interfacial stresses and micro movements. Titanium alloy (Ti 6 Al 4 V), when used as a material for femoral stem, recorded large displacement as compared to Chromium alloy (CoCrMo) stems. This large displacement in case of Ti 6 Al 4 V caused the stem to bend inside the cement mantle, thus destroying it. Thus, CoCrMo proved to be a better choice of material for stem, in cemented THA. Failure in THA may occur at cement-stem or cement-bone interface, thus interfacial stresses and micro movements were analysed in the present study. Comparison between trapezium and circular cross section showed that, femoral stem with trapezium cross section underwent lesser amount of sliding and debonding, at both interfaces, as compared to circular cross section. Moreover, trapezium cross section also generated lower peak stresses in femoral stem and cortical femur. The present study also took into account, effect of diameter of femur head. A 36mm diameter femur head generated lower peak stress in acetabulum liner and arrested dislocation. Metallic femur head was coupled with a liner made of cross linked polyethylene (XLPE). This material experiences almost negligible wear when compared to typical metallic and polyethylene liners, and unlike metallic liner, it is non-carcinogenic.

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Finite element study on the predicted equivalent stresses in the artificial hip joint

Cited by 12 publications

References 27 publications

Contact of dual mobility implants: effects of cup wear and inclination

Contact of dual mobility implants: effects of cup wear and inclination

Optimization and the Impact of Various Factors on the Orthopedic Cement Used in the Total Hip Arthroplasty

Analysis of Femoral Components of Cemented Total Hip Arthroplasty

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