scholarly journals Finite Element Analysis on Knee Joint with Leg Length Inequality

2018 ◽  
Vol 7 (4.30) ◽  
pp. 359
Author(s):  
N. F. Othman ◽  
M. N. A. Suhaimi ◽  
K. S. Basaruddin ◽  
M. H. Mat Som ◽  
W. M. R. Rusli
Keyword(s):  
Knee Joint ◽  
Reaction Force ◽  
Equivalent Stress ◽  
Static Condition ◽  
Von Mises Stress ◽  
Stress And Strain ◽  
Leg Length ◽  
Joint Reaction Force ◽  
Element Analysis ◽  
Joint Reaction

This study aims to investigate the effect of leg length discrepancy (LLD) on the joint reaction stress and strain of femur particularly in the knee joint. The knee joint model was developed using CATIA and imported into ANSYS to simulate the LLD case based on the value of the joint reaction force from the previous experimental study. The analysis was done under a linear static condition. The knee components were divided on three; bone (femur and tibia), cartilage (femoral cartilage and tibial plateau cartilage) and menisci. The effect of LLD on the knee joint was determined by observing the contour of equivalent stress and strain distribution on the knee joint components and the maximum equivalent von-Mises stress and strain. The result shows a higher value of stress and strain was found on the short leg compared to the long leg due to the LLD. The pattern of overall results shows that the magnitude of stress-strain is proportional to the level of increments in LLD. Since the short leg demonstrate the greater in stress and strain value, it is prone to experience failure in the future such as wear in cartilage.

scholarly journals Estimation of stress and strain of knee joint using finite element analysis

2021 ◽  
Vol 2070 (1) ◽  
pp. 012217
Author(s):  
Aadarsh S Chandran ◽  
Reena Trivedi ◽  
Bharat Modi ◽  
Rajesh Patel
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Knee Joint ◽  
Preventive Measure ◽  
Static Condition ◽  
Simulation Software ◽  
Stress And Strain ◽  
Element Analysis ◽  
Software Analysis ◽  
And Gender

Abstract In the present paper, finite element analysis of the knee joint is performed for stress and strain estimation of the knee joint for osteoarthritis patients. Osteoarthritis (OA), called the wear and tear arthritis is commonly occurring arthritis wherein a gradual loss of cartilage from the joints are observed. This leads to the joint bones rubbing quite close against one another with less amount of shock-absorbing done by the cartilage causing pain, stiffness, swelling, decreased movability and bone spur formation can be observed. It is mostly observed in patients above 45 years old, but weight and gender are also some of the factors forcing a quick onset of the disease. Using modelling software Blender, a solid model is made of the bone component, namely tibia, fibula, femur and patella as well as Ligaments and cartilages. Using finite element simulation software, analysis is done to determine the level of stress under various forces on the joint. The knee joint experiences a maximum stress and strain of 2.352 MPa and 0.02454 respectively which are within safe static condition. The study can be further extended to predict the danger of failure for the patients having osteoarthritis conditions which in turn will help to take a preventive measure for the knee joint.

Clinical effects of leg length discrepancy through ground and joint reaction force responses: A review

2017 ◽  
Author(s):  
S. W. K. Ali Zabri ◽  
K. S. Basaruddin ◽  
A. F. Salleh ◽  
W. M. R. Rusli ◽  
R. Daud
Keyword(s):  
Reaction Force ◽  
Leg Length Discrepancy ◽  
Clinical Effects ◽  
Leg Length ◽  
Joint Reaction Force ◽  
Length Discrepancy ◽  
Joint Reaction

scholarly journals Estimation of knee joint reaction force based on the plantar flexion resistance of an ankle-foot orthosis during gait

2018 ◽  
Vol 30 (8) ◽  
pp. 966-970 ◽  
Author(s):  
Masataka Yamamoto ◽  
Koji Shimatani ◽  
Masaki Hasegawa ◽  
Takuya Murata ◽  
Yuichi Kurita
Keyword(s):  
Knee Joint ◽  
Plantar Flexion ◽  
Reaction Force ◽  
Joint Reaction Force ◽  
Ankle Foot Orthosis ◽  
Foot Orthosis ◽  
Joint Reaction

Knee joint reaction force during tibial diaphyseal lengthening: a study on a rabbit model

2004 ◽  
Vol 37 (7) ◽  
pp. 1053-1059 ◽  
Author(s):  
Lang Yang ◽  
Gang Cai ◽  
Les Coulton ◽  
Michael Saleh
Keyword(s):  
Knee Joint ◽  
Reaction Force ◽  
Rabbit Model ◽  
Joint Reaction Force ◽  
Joint Reaction

scholarly journals 3D Finite Element Analysis of Rotary Instruments in Root Canal Dentine with Different Elastic Moduli

2021 ◽  
Vol 11 (6) ◽  
pp. 2547 ◽  
Author(s):  
Carlo Prati ◽  
João Paulo Mendes Tribst ◽  
Amanda Maria de Oliveira Dal Piva ◽  
Alexandre Luiz Souto Borges ◽  
Maurizio Ventre ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Root Canal ◽  
Elastic Moduli ◽  
Reaction Force ◽  
Von Mises Stress ◽  
Elastic Behavior ◽  
Element Analysis ◽  
Heat Treated ◽  
Von Mises

The aim of the present investigation was to calculate the stress distribution generated in the root dentine canal during mechanical rotation of five different NiTi endodontic instruments by means of a finite element analysis (FEA). Two conventional alloy NiTi instruments F360 25/04 and F6 Skytaper 25/06, in comparison to three heat treated alloys NiTI Hyflex CM 25/04, Protaper Next 25/06 and One Curve 25/06 were considered and analyzed. The instruments’ flexibility (reaction force) and geometrical features (cross section, conicity) were previously investigated. For each instrument, dentine root canals with two different elastic moduli(18 and 42 GPa) were simulated with defined apical ratios. Ten different CAD instrument models were created and their mechanical behaviors were analyzed by a 3D-FEA. Static structural analyses were performed with a non-failure condition, since a linear elastic behavior was assumed for all components. All the instruments generated a stress area concentration in correspondence to the root canal curvature at approx. 7 mm from the apex. The maximum values were found when instruments were analyzed in the highest elastic modulus dentine canal. Strain and von Mises stress patterns showed a higher concentration in the first part of curved radius of all the instruments. Conventional Ni-Ti endodontic instruments demonstrated higher stress magnitudes, regardless of the conicity of 4% and 6%, and they showed the highest von Mises stress values in sound, as well as in mineralized dentine canals. Heat-treated endodontic instruments with higher flexibility values showed a reduced stress concentration map. Hyflex CM 25/04 displayed the lowest von Mises stress values of, respectively, 35.73 and 44.30 GPa for sound and mineralized dentine. The mechanical behavior of all rotary endodontic instruments was influenced by the different elastic moduli and by the dentine canal rigidity.

Optimal Design of Bi- and Multi-Stable Compliant Cellular Structures

2018 ◽  
Author(s):  
Quantian Luo ◽  
Liyong Tong
Keyword(s):  
Optimal Design ◽  
Virtual Work ◽  
Reaction Force ◽  
Nonlinear Finite Element ◽  
Cellular Structures ◽  
Stress And Strain ◽  
Principle Of Virtual Work ◽  
Stable States ◽  
Threshold Method ◽  
Element Analysis

This paper presents optimal design for nonlinear compliant cellular structures with bi- and multi-stable states via topology optimization. Based on the principle of virtual work, formulations for displacements and forces are derived and expressed in terms of stress and strain in all load steps in nonlinear finite element analysis. Optimization for compliant structures with bi-stable states is then formulated as: 1) to maximize the displacement under specified force larger than its critical one; and 2) to minimize the reaction force for the prescribed displacement larger than its critical one. Algorithms are developed using the present formulations and the moving iso-surface threshold method. Optimal design for a unit cell with bi-stable states is studied first, and then designs of multi-stable compliant cellular structures are discussed.

Sign in / Sign up

Export Citation Format

Share Document