Conformity assessment with structural strength requirements of mechanical polycentric prosthetic knee used for amputee rehabilitation

Mohanty, Rajesh Kumar; Mohanty, Ramesh Chandra; Sabut, Sukanta; Pandey, Mukundjee

doi:10.1080/10255842.2022.2088233

Cited by 8 publications

(2 citation statements)

References 25 publications

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“…The 3D CAD model of the modified polycentric knee prosthesis is imported into ANSYS Workbench R19.2 for simulation. The mesh independence test, grid refinements and mesh quality are ensured as defined in our earlier study [18]. The h-method has been followed for numerical convergence.…”

Section: The Finite Element Analysismentioning

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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Section: The Finite Element Analysismentioning

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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“…Commercially available computer‐aided design (CAD) and engineering simulation software packages can be used for virtually designing, simulating, predicting and improving the quality of components at the design stage itself. Structural strength tests as per the International Organisation for Standardisation (ISO) 10328:2006 standards were performed by prior researchers 12,13 including static and fatigue analyses for a mechanical polycentric prosthetic knee by finite element simulations and experimentations to ensure its structural integrity. Mathematical models 14,15 were used to study the kinematics of the linkage mechanism used in polycentric knees to predict the relative motion between the links and trace the Instantaneous centre (I C ) of rotation for the designed linkage mechanism.…”

Section: Introductionmentioning

confidence: 99%

Computational assessment of carbon fabric reinforced polymer made prosthetic knee: Mechanics, finite element simulations and experimental evaluation

Amudhan,

Vasanthanathan,

Thilak

2024

Numer Methods Biomed Eng

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A prosthetic knee is designed to replace the functionality of an anatomical knee in transfemoral amputees. The purpose of a prosthetic knee is to restore mobility and compensate amputees for their impairment. In the present research numerical modelling and simulation of a carbon fabric reinforced polymer made polycentric prosthetic knee with four‐bar mechanism was performed. Virtual prototyping with computer‐aided design and computer‐aided engineering software ensured geometric and structural stability of the knee design. The linkage mechanism, instantaneous centre's location and trajectory were investigated using multibody dynamics and analytical formulations. Computational simulations with a non‐linear finite element model were employed with joints, contact formulations and an orthotropic material model to predict the displacement, stress formulated and life of the knee prosthesis under static and cyclic loading conditions. Finite element analysis assessed the strength and durability of knee in accordance to standards. Maximum Principal stress of 155 MPa and life expectancy of 3.1 × 106 cycles were determined for the composite knee through numerical simulations ensuring a safe design. Experimental testing was also conducted as per standards and the percentage error was estimated to be 2.52%, thereby establishing the validity of the finite element model deployed. This type of simulation‐based approach can be implemented to efficiently and affordably design and prototype a prosthetic knee with desired functioning criteria.

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Static simulation of polycentric prosthetic knee for structural compliance

Mohanty,

Sabut

2024

Int J Interact Des Manuf

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Conformity assessment with structural strength requirements of mechanical polycentric prosthetic knee used for amputee rehabilitation

Cited by 8 publications

References 25 publications

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

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

Computational assessment of carbon fabric reinforced polymer made prosthetic knee: Mechanics, finite element simulations and experimental evaluation

Static simulation of polycentric prosthetic knee for structural compliance

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