On a Refined Finite Element Model of the Knee Joint

1999 ◽  
Author(s):  
K. Moglo ◽  
A. Shirazi-Adl
Keyword(s):  
Finite Element ◽  
Articular Cartilage ◽  
Knee Joint ◽  
Finite Element Model ◽  
Element Model ◽  
Force Transmission ◽  
Full Extension ◽  
Human Knee Joint ◽  
Coupled Response ◽  
Nonlinear Finite Element Model

Abstract A refined 3D elastostatic nonlinear finite element model was developed for the human knee joint in other to predict the passive global primary/coupled response and force transmission mechanism under various loads/movements and pathologic conditions. The joint geometry was based on an existing model (Bendjaballah et al., 1995) which was substantially refined in the articular cartilage and menisci regions as well as the articulating contact surfaces. The articular cartilage is subdivided into two layers along the depth allowing for the possibility to consider non homogeneity in mechanical propreties. The incremental response of the knee joint was evaluated under axial force of up to 780 N applied on the femur in full extension position. The global primary/coupled response, ligament forces as well as load transmission in medial/lateral plateaus through menisci and uncovered cartilage are analysed.

A 3D Biphasic Finite Element Model of the Human Knee Joint for the Study of Tibiofemoral Contact and Fluid Pressurization

2013 ◽  
Author(s):  
Hongqiang Guo ◽  
Suzanne A. Maher ◽  
Robert L. Spilker
Keyword(s):  
Finite Element ◽  
Fluid Flow ◽  
Knee Joint ◽  
Contact Problem ◽  
Finite Element Model ◽  
Soft Tissues ◽  
Fluid Pressure ◽  
Element Model ◽  
Human Knee Joint ◽  
Biphasic Finite Element

Biphasic theory which considers soft tissue, such as articular cartilage and meniscus, as a combination of a solid and a fluid phase has been widely used to model their biomechanical behavior [1]. Though fluid flow plays an important role in the load-carrying ability of soft tissues, most finite element models of the knee joint consider cartilage and the meniscus as solid. This simplification is due to the fact that biphasic contact is complicated to model. Beside the continuity conditions for displacement and traction that a single-phase contact problem consists of, there are two additional continuity conditions in the biphasic contact problem for relative fluid flow and fluid pressure [2]. The problem becomes even more complex when a joint is being modeled. The knee joint, for example, has multiple contact pairs which make the biphasic finite element model of this joint far more complex. Several biphasic models of the knee have been developed [3–9], yet simplifications were included in these models: (1) the 3D geometry of the knee was represented by a 2D axisymmetric geometry [3, 5, 6, 9]; (2) no fluid flow was allowed between contact surfaces of the soft tissues [4, 8] which is inconsistent with the equation of mass conservation across the contact interface [10]; (3) zero fluid pressure boundary conditions were inaccurately applied around the contact area [7].

scholarly journals Evaluation of a posterior cruciate ligament deficient human knee joint finite element model

2014 ◽  
Vol 2014 (1) ◽  
pp. 21 ◽  
Author(s):  
Achilles Vairis ◽  
Markos Petousis ◽  
Nectarios Vidakis ◽  
Betina Kandyla ◽  
Andreas-Marios Tsainis
Keyword(s):  
Finite Element ◽  
Knee Joint ◽  
Finite Element Model ◽  
Posterior Cruciate Ligament ◽  
Cruciate Ligament ◽  
Element Model ◽  
Human Knee ◽  
Human Knee Joint

Evaluation of an intact, an ACL-deficient, and a reconstructed human knee joint finite element model

2015 ◽  
Vol 19 (3) ◽  
pp. 263-270 ◽  
Author(s):  
Achilles Vairis ◽  
George Stefanoudakis ◽  
Markos Petousis ◽  
Nectarios Vidakis ◽  
Andreas-Marios Tsainis ◽  
...  
Keyword(s):  
Finite Element ◽  
Knee Joint ◽  
Finite Element Model ◽  
Element Model ◽  
Human Knee ◽  
Human Knee Joint ◽  
Acl Deficient

Development of a 3-D Non-Linear Finite Element Model of Human Knee Joint

2002 ◽  
Author(s):  
Yuhua Song ◽  
Richard E. Debski ◽  
Jorge Gil ◽  
Savio L.-Y. Woo
Keyword(s):  
Finite Element ◽  
Knee Joint ◽  
Soft Tissues ◽  
Cruciate Ligament ◽  
Element Model ◽  
Fe Model ◽  
Full Extension ◽  
Human Knee ◽  
Human Knee Joint ◽  
Non Linear

A 3-D finite element (FE) model of the knee is needed to more accurately analyze the kinematics of a knee joint as well as the function of various soft tissues such as ligaments. The data obtained can provide a better understanding of mechanisms of injury and offer valuable information for ligament reconstruction and rehabilitation protocols. The objective of this study was to develop a 3-D non-linear FE model of a human knee and determine its kinematics and the force and stress distributions within the anterior cruciate ligament (ACL) in response to anterior tibial loads at full extension. This model was validated by comparing the computed results to data obtained experimentally by a Robotic/UFS testing system [1].

scholarly journals The Influence of the Inclination of Lattice Columns on the Safety of Combined Tower Crane

2022 ◽  
Vol 2022 ◽  
pp. 1-10
Author(s):  
Yongquan Wang ◽  
Tianfu Li ◽  
Kaifa Dong ◽  
Zhengxing Guo ◽  
Jing Fu
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Working Conditions ◽  
Calculated Data ◽  
Element Model ◽  
Nonlinear Finite Element ◽  
Utilization Rate ◽  
Force Transmission ◽  
Tower Crane ◽  
Nonlinear Finite Element Model

The combined tower crane foundation is widely used in construction sites due to its advanced utilization rate. However, the immature construction method, unavoidable construction deviation during the installation process, and influence of the surrounding construction generally cause the lattice columns to tilt. As the main force transmission components of the tower crane foundation, once its stress and deformation exceed the limit, the entire tower crane will collapse, which requires engineers to accurately control its safety. Therefore, the objective of the work reported here was to study the safety of the lattice columns during operation. A geometrically nonlinear finite element model was utilized to simulate the strain and deformation capacity of tower cranes under various working conditions, including vertical and inclined working conditions, operation and shutdown conditions, and conditions with the tower boom in different orientations. In addition, this study combines the simulation with the on-site measurement. The results of on-site measurement were also recorded to verify the correctness of the proposed calculation model. It was concluded that the inclination of lattice columns has a significant effect on the deformation and stress of the lattice columns of the tower crane foundation, and the measured data and the calculated data trend are consistent. Engineers can accurately judge the safety of the lattice columns of the tower crane foundation through geometric nonlinear finite element model analysis and on-site monitoring to avoid the failure of the lattice columns and the occurrence of safety accidents.

scholarly journals Biomechanical characteristics of tibio-femoral joint after partial medial meniscectomy in different flexion angles: a finite element analysis

2021 ◽  
Vol 22 (1) ◽  
Author(s):  
Xiaohui Zhang ◽  
Shuo Yuan ◽  
Jun Wang ◽  
Bagen Liao ◽  
De Liang
Keyword(s):  
Finite Element ◽  
Articular Cartilage ◽  
Finite Element Model ◽  
Medial Meniscus ◽  
Lateral Meniscus ◽  
Element Model ◽  
Magnetic Resonance Images ◽  
Biomechanical Analysis ◽  
Joint Stress ◽  
Tibiofemoral Joint

Abstract Background Recent studies have pointed out that arthroscopy, the commonly-used surgical procedure for meniscal tears, may lead to an elevated risk of knee osteoarthritis (KOA). The biomechanical factors of KOA can be clarified by the biomechanical analysis after arthroscopic partial meniscectomy (APM). This study aimed to elucidate the cartilage stress and meniscus displacement of the tibiofemoral joint under flexion and rotation loads after APM. Methods A detailed finite element model of the knee bone, cartilage, meniscus, and major ligaments was established by combining computed tomography and magnetic resonance images. Vertical load and front load were applied to simulate different knee buckling angles. At the same time, by simulating flexion of different degrees and internal and external rotations, the stresses on tibiofemoral articular cartilage and meniscus displacement were evaluated. Results Generally, the contact stress on both the femoral tibial articular cartilage and the meniscus increased with the increased flexion degree. Moreover, the maximum stress on the tibial plateau gradually moved backward. The maximum position shift value of the lateral meniscus was larger than that of the medial meniscus. Conclusion Our finite element model provides a realistic three-dimensional model to evaluate the influence of different joint range of motion and rotating tibiofemoral joint stress distribution. The decreased displacement of the medial meniscus may explain the higher pressure on the knee components. These characteristics of the medial tibiofemoral joint indicate the potential biomechanical risk of knee degeneration.

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