Life Estimation of Hip Joint Prosthesis

Background: Patients suffering from osteoarthritis undergo surgery to replace hip joints with hip prosthesis implants. Today most acetabular cups of hip prostheses are made of Ultra-High-Molecular-Weight-Polyethylene. However, these materials acting as acetabular cups of the implant have been recalled since patients have been feeling uncomfortable and abstained from physical activities. A newly introduced material, 30% Carbon Reinforced Polyetherketone, possess better isotropic mechanical properties and lower wear rates. Objective: The research aims to compare the von-Mises stresses and deformation in static and dynamic loading of Ultra-High Molecular-Weight-Polyethylene to 30% Reinforced Carbon Fiber Polyetherketone using Finite Element Analysis. Material and Methods: An analytical study was performed to evaluate material selection and their contact performances of acetabular cups. Four pairs have been analyzed under loading conditions following ASTM F2996-13 and ISO 7206-4 standards. The acetabular cups options are made of 30% Carbon Reinforced Fiber Polyetherketone or Ultra-High-Molecular-Weight-Polyethylene. Besides, the femoral head and steam options are either Alumina Ceramic or Cobalt Chrome Molybdenum. Results: The yield strength of Ultra-High-Molecular-Weight-Polyethylene is considerably small, resulting in the acetabular cup to fail when applied to high loading conditions. Carbon Reinforced Polyetherketone with Alumina Ceramic yielded 65% lower deformation at stumbling phase. Conclusion: Since the study focuses on linear isotropic material properties, Alumina Ceramic dominates a higher elastic modulus than Cobalt Chrome Molybdenum, nominating it the best fit combination for lower von-Mises stresses, acting on the Carbon Reinforced Polyetherketone acetabular cup.

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“…In a complete walking cycle, the hip joint rotates 80° [ 15 ]. The femoral head of the radius for this present study is 12 mm.…”

Section: Resultsmentioning

confidence: 99%

Comparative Evaluation of Carbon Reinforced Polyetherketone Acetabular Cup using Finite Element Analysis

Abdal

Noorani

2020

J Biomed Phys Eng

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“…Some studies have pointed out that although medical-grade titanium has excellent fatigue properties, the ISO pre-clinical durability testing standard does not adequately account for the influence of femoral offset or stem size to reflect safe design practice [26]. For static human body weight load, hip joint prostheses were found to be safe and dynamic analysis revealed that the hip joint prosthesis had an infinite fatigue life [27]. A hip joint model made of UHMWPE/ TiO2 Polymer composite used to study fatigue failure was found to be safe in static and fatigue analysis [23].…”

Section: Introductionmentioning

confidence: 99%

Fatigue life evaluation of different hip implant designs using finite element analysis

Corda,

Chethan,

Shenoy

et al. 2023

J Appl Eng Science

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Fatigue failure is one of the causes of the failure of hip implants. The main objective of this work is to carry out fatigue failure analysis on different hip profiles and compare the outcomes for various combinations of materials. Three profiles each for circular, oval, elliptical, and trapezoidal stems are utilized for this study with four different material combinations consisting of materials like Ti–6Al–4V, CoCr Alloy and UHMWPE. CATIA V-6 is used for the modelling of these implants and the fatigue analysis using Goodman's mean stress theory is simulated using ANSYS 2022 R1. ISO 7206-4 and ASTM F2996-13 standards are used to define the boundary conditions. A total of 48 combinations were studied across four different shapes, three different profiles and four different material combi-nations to deduce the best possible combination for a hip implant for static and fatigue loading. Comparison of the implants is based on the factors like equivalent von Mises stress, displacement, equivalent elastic strain, fatigue life, safety factor and equivalent alternating stress. Profile 2 of the trapezoidal-shaped hip implant with a Ti–6Al–4V stem exhibited superior results both under static and fatigue loading conditions. Compared to displacements obtained for profiles one and three, profile 2 trapezoidal stem with Ti–6Al–4V and other parts as CoCr Alloy has about 72% lower displacement. Based on the findings, profile 2 with a trapezoidal stem made of Ti–6Al–4V and an acetabular cup made of CoCr shows the enhanced results over the other combinations considered.

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Fixation of Pauwel’s type-II femoral neck fracture with triangular, rectangular, and pentangular configuration cannulated screws using finite element analysis

Belwanshi

Jayaswal

Aherwar

2023

J Braz. Soc. Mech. Sci. Eng.

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Life Estimation of Hip Joint Prosthesis

Abstract: Hip joint is one of the largest weight-bearing structures in the human body. In

Cited by 14 publications

References 11 publications

Comparative Evaluation of Carbon Reinforced Polyetherketone Acetabular Cup using Finite Element Analysis

Comparative Evaluation of Carbon Reinforced Polyetherketone Acetabular Cup using Finite Element Analysis

Fatigue life evaluation of different hip implant designs using finite element analysis

Fixation of Pauwel’s type-II femoral neck fracture with triangular, rectangular, and pentangular configuration cannulated screws using finite element analysis

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