Finite element modeling and validation of a four-bar linkage prosthetic knee under static and cyclic strength tests

Lapapong, Sittikorn; Sucharitpwatskul, Sedthawatt; Pitaksapsin, Narong; Srisurangkul, Chadchai; Lerspalungsanti, Sarawut; Naewngerndee, Rattanasuda; Sedchaicharn, K.; Chonnaparamutt, Winai; Pipitpukdee, Jagkapong

doi:10.3402/jartt.v2.23211

Cited by 10 publications

(8 citation statements)

References 3 publications

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“…An instantaneous centre of rotation (ICR) of four bar knee mechanism must be first defined to identify the load line 12) . Four planes including one reference planes are used to analyses the position of the load sharing line whereas one plane must pass through the ICR 18,19) as shown in figure 3(a), (b)…”

Section: Kinematic Arrangement Of Four Bar Knee Prosthesismentioning

confidence: 99%

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Structural analysis of a Four-bar linkage mechanism of Prosthetic knee joint using Finite Element Method

Chauhan¹,

Bhaduri²

2020

Evergreen

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The main objective of this study is to check and validate an existing structural design of above knee prosthesis developed by hosmer knee. A CAD model for above knee prosthesis has been developed and Finite element analysis has been done for static and cyclic load. Selection of reference planes and load line positioning has been done using International Organization for standardization (ISO) test procedure. This test is titled as Prosthetics-Structural testing of lowerlimb prostheses-Requirements and test methods (ISO 10328:2016). A test model have also been designed and fabricated in the lab for the static and cyclic loading. Six trials were conducted in order to check the design and load-bearing part of the prosthesis. Prosthetic Knee joint also performed a deep flexion for the maximum stress condition. A finite element model (FEM) imparting the induced stress distribution in the prosthesis to ensure its safe performance in the fatigue life has been developed. Strains computed in the mechanism from the FEM validate the values obtained from the experimental data obtained in static and fatigue test conducted using ISO 10328:2016 procedure. The average percentage error of simulation in all testing conditions is within 20%. The knee prosthesis is safe under the physical structural test without any failures as calculated in the simulation.

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Section: Kinematic Arrangement Of Four Bar Knee Prosthesismentioning

confidence: 99%

“…A three dimensional CAD model of a four bar above knee prosthesis was first developed as shown in figure 4. The configuration of this solid model was first evaluated kinematically in order to satisfy the functional requirements of the knee prosthesis 19) . This model must be satisfying the ISO 10328:2006 standard 20) .…”

Section: Cad Modelingmentioning

confidence: 99%

Structural analysis of a Four-bar linkage mechanism of Prosthetic knee joint using Finite Element Method

Chauhan¹,

Bhaduri²

2020

Evergreen

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“…The uncertainty related to FEA simulation results was taken as the percentage error reported by Lapapong et al. 33 when mechanical testing FEA simulation results of a polycentric knee were compared to true mechanical tests. The results showed a 15% error in the static test and a 22% error in the cyclic tests.…”

Section: Electre III Rankingmentioning

confidence: 99%

Optimal material selection for the construction of a paediatric prosthetic knee

Mangera

Kienhöfer

Carlson

et al. 2015

Proceedings of the Institution of Mechanical Engineers, Part L:

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The material selection of prostheses in developing countries is currently biased towards what is readily available and ignores important criteria such as patient comfort and structural strength. In this study, the ELECTRE III multiple attribute decision-making method was applied to the material selection of a paediatric prosthetic knee. Light metals were considered as candidates for selection. While composites are light, they are not suitable for use in components with sliding and mating surfaces such as a prosthetic knee. Plastics are prone to failure. Candidate materials were evaluated on criteria related to patient fatigue and comfort, structural stability and material cost. The patient fatigue and comfort requirement was evaluated using material density as the weight of the prosthesis affects the comfort level. Finite element analyses simulating the ISO 10328:2006 standard for structural testing of lower limb prostheses were used to evaluate the structural strength suitability of the candidate materials. The present day prices of the raw material of the candidates were used as an index of material cost. Wrought aluminium alloy aluminium 7175 was ranked highest while titanium alloys were ranked below these due to their higher cost. Cast aluminium alloys ranked lowest due to their poor structural performance. The study, using ELECTRE III, a rigorous multi-criteria decision analysis method, shows that aluminium 7175 is the optimal light metal material for a paediatric prosthetic knee.

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“…The motivation for the present investigation lies in the design and development of a functionally efficient indigenous knee prosthesis that should possess enhanced stability and durability, at the same time, should be cost-effective to reach maximum individuals with transfemoral amputation. Earlier literature has reported more concentration on new prosthetic knee designs and their simulation studies [3][4][5][6][7][8][9][10][11][12]. However, few have examined prosthetic knee strength according to ISO standard [8,13,14].…”

Section: Introductionmentioning

confidence: 99%

“…Earlier literature has reported more concentration on new prosthetic knee designs and their simulation studies [3][4][5][6][7][8][9][10][11][12]. However, few have examined prosthetic knee strength according to ISO standard [8,13,14]. Several 4-bar polycentric knee prostheses have been manufactured utilizing kinematic approaches [15,16], but few studies have investigated their structural designs using finite element analysis (FEA) [5,6,14,16] and its optimization methods [16].…”

Section: Introductionmentioning

confidence: 99%

Design and analysis of polycentric prosthetic knee with enhanced kinematics and stability

Mohanty

Sabut

2023

Phys Eng Sci Med

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This paper describes a continuation of earlier work using the finite element method to conduct an engineering failure analysis of existing polycentric prosthetic knee. The primary purpose of this work is to enhance the quality of the existing knee which has been reported with multiple cases of failure during its clinical practice in India. A modified design of the polycentric knee has been proposed based on the findings of failure analysis. Simulation-based comparative analysis of polycentric knees has been performed as per the ISO 10328:2016 standard in terms of stress distribution, total contour deformation, safety factor, and fatigue life. The upper extension lever is subjected to static and cyclic loads of 4130 and 1230 N, whereas lower plate has translational constraint. The modified polycentric knee prosthesis outperforms static and fatigue strength tests. The standard of the existing knee prosthesis has significantly improved as a result of design variations and integration of high-strength and lightweight aluminium 7075-T6 alloy. The modified polycentric knee prosthesis has a predicted maximum deformation of less than 0.7 mm and a minimum safety factor between 1.7 and 2 compared to 2.66 mm and 1.0 for the existing knee prosthesis. Based on the fatigue simulation results, it is predicted that the modified polycentric knee will have a lifespan of at least ten years indicating a safe design. It has improved alignment stability and kinematics, with a significant weight reduction of 33 g, and a high cost-benefit ratio to reach the maximum amputee population in low-income countries like India.

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Finite element modeling and validation of a four-bar linkage prosthetic knee under static and cyclic strength tests

Cited by 10 publications

References 3 publications

Structural analysis of a Four-bar linkage mechanism of Prosthetic knee joint using Finite Element Method

Structural analysis of a Four-bar linkage mechanism of Prosthetic knee joint using Finite Element Method

Optimal material selection for the construction of a paediatric prosthetic knee

Design and analysis of polycentric prosthetic knee with enhanced kinematics and stability

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