scholarly journals Nonlinear Dynamic Behavior of the Human Knee Joint—Part II: Time-Domain Analyses: Effects of Structural Damage in Postmortem Experiments

1991 ◽  
Vol 113 (4) ◽  
pp. 392-396 ◽  
Author(s):  
Dortmans ◽  
H. Jans ◽  
A. Sauren ◽  
A. Huson
Keyword(s):  
Knee Joint ◽  
Dynamic Behavior ◽  
Time Domain ◽  
Nonlinear Dynamic ◽  
Structural Damage ◽  
Time Domain Analysis ◽  
Human Knee ◽  
Human Knee Joint ◽  
Analysis Technique ◽  
Stiffness And Damping

A description is given of the results obtained for step excitation for two human knee joint specimens using a time-domain analysis technique. As was expected from the results of a previous study, the magnitude of the dynamic load applied has a marked influence upon the stiffness and damping values for the two observed vibration modes. Deliberate damaging of selected joint elements also yields a well observable change in the dynamic behavior of the joint although these changes are difficult to interpret. Here the use of a nonlinear dynamic numerical model of the knee joint seems indispensable. An important observation is, however, that the experimental method discussed here enables to quantify the behavior of the joint and therefore may provide a valuable tool for validation of such a model.

scholarly journals Nonlinear Dynamic Behavior of the Human Knee Joint—Part I: Postmortem Frequency Domain Analyses

1991 ◽  
Vol 113 (4) ◽  
pp. 387-391 ◽  
Author(s):  
L. Dortmans ◽  
H. Jans ◽  
A. Sauren ◽  
A. Huson
Keyword(s):  
Knee Joint ◽  
Dynamic Behavior ◽  
Dynamic Load ◽  
Transfer Functions ◽  
Equilibrium Configuration ◽  
Static Equilibrium ◽  
Linearization Technique ◽  
Human Knee ◽  
Local Linearization ◽  
Human Knee Joint

Characteristic results of postmortem experiments on five knee-joint specimens are reported. The experiments were performed to investigate the applicability of a local linearization technique that would make it possible to describe the dynamic behavior of the joint in terms of transfer functions. The results indicate that the stiffness of the bracing wires, attached to muscle tendons to create a static equilibrium position, can be accounted for when determining the stiffness of the joint. Besides the static equilibrium configuration, the magnitude of the dynamic load and the type of dynamic load applied to the joint can be shown to have their influence. As the influence of the dynamic load is significant, it has to be concluded that in essence the knee joint has to be regarded as a nonlinear system, making application of a Local Linearization Technique questionable. However, when the magnitude of the dynamic load is included as an additional measurement parameter, an indication can be obtained about the behavior of the joint and the degree of nonlinearity.

Evaluating Relationship Between Passive Knee Envelope and a Dynamically Simulated Walk

2010 ◽  
Author(s):  
Amit M. Mane ◽  
Lorin P. Maletsky
Keyword(s):  
Knee Joint ◽  
Principal Component ◽  
Motion Patterns ◽  
Human Knee ◽  
Human Knee Joint ◽  
Analysis Technique ◽  
Knee Joint Kinematics ◽  
Motion Characteristics ◽  
Muscle Activations ◽  
Tibiofemoral Kinematics

The motion patterns of the human knee joint depend on its passive motion characteristics, which are described by the ligamentious and articular constraints. Since active motions, like walking and squatting are believed to fall within a passive envelope, the basis for the understanding of the knee joint kinematics lies in the description of its passive constraint characteristics [1]. The link between the knee passive envelope and the kinematics during various dynamic activities has not been studied. It is unclear how the articular geometry and muscle activations of the knee influence the contribution of ligament constraints during dynamic activities. To explain the relationship between knee passive envelope and dynamic activities completely, new methodology must be developed. The objective of the present study was to estimate the effects of variation in passive knee envelope on the tibiofemoral kinematics during dynamically simulated gait using a multivariate analysis technique, principal component (PC) analysis.

Study Surface Roughness and Friction of Synovial Human Knee Joint with Using Mathematical Model

2018 ◽  
Vol 00 (1) ◽  
pp. 109-118
Author(s):  
Enas Y. Abdullah ◽  
◽  
Naktal Moid Edan ◽  
Athraa N. Kadhim ◽  
◽  
...  
Keyword(s):  
Mathematical Model ◽  
Surface Roughness ◽  
Knee Joint ◽  
Human Knee ◽  
Human Knee Joint

Accuracy analysis of a clinical measurement system for AP-laxity in the human knee joint

1985 ◽  
Vol 18 (7) ◽  
pp. 541
Author(s):  
Ph. Edixhoven ◽  
R. Huiskes ◽  
Th.J.G. van Rens ◽  
T.J.J.H. Slooff
Keyword(s):  
Knee Joint ◽  
Measurement System ◽  
Accuracy Analysis ◽  
Clinical Measurement ◽  
Human Knee ◽  
Human Knee Joint

scholarly journals Indian Hedgehog in Synovial Fluid Is a Novel Marker for Early Cartilage Lesions in Human Knee Joint

2014 ◽  
Vol 15 (5) ◽  
pp. 7250-7265 ◽  
Author(s):  
Congming Zhang ◽  
Xiaochun Wei ◽  
Chongwei Chen ◽  
Kun Cao ◽  
Yongping Li ◽  
...  
Keyword(s):  
Synovial Fluid ◽  
Knee Joint ◽  
Indian Hedgehog ◽  
Human Knee ◽  
Cartilage Lesions ◽  
Human Knee Joint
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