scholarly journals Design and Experimental Research of Knee Joint Prosthesis Based on Gait Acquisition Technology

Biomimetics ◽  
2021 ◽  
Vol 6 (2) ◽  
pp. 28
Author(s):  
Yonghong Zhang ◽  
Erliang Wang ◽  
Miao Wang ◽  
Sizhe Liu ◽  
Wenjie Ge
Keyword(s):  
Knee Joint ◽  
Lower Limbs ◽  
Movement Trajectory ◽  
Human Knee ◽  
Motion Data ◽  
Human Knee Joint ◽  
Lower Limb Prosthesis ◽  
Knee Joint Motion ◽  
Normal Human ◽  
Instantaneous Center

Whether the lower limb prosthesis can better meet the needs of amputees, the biomimetic performance of the knee joint is particularly important. In this paper, Nokov(metric) optical 3D motion capture system was used to collect motion data of normal human lower limbs, and the motion instantaneous center of multi-gait knee joint was obtained. Taking the error of knee joint motion instantaneous center line as the objective function, a set of six-bar mechanism prosthetic knee joint was designed based on a genetic algorithm. The experimental results show that the movement trajectory of the instantaneous center of the knee joint is basically similar to that of the human knee joint, so it can help amputees complete a variety of gaits and has good biomimetic performance. Gait acquisition technology can provide important data for prosthetic designers and it will be widely used in prosthetic design and other fields.

scholarly journals Modelling of the Human Knee Joint Supported by Active Orthosis

2018 ◽  
Vol 23 (1) ◽  
pp. 107-120
Author(s):  
V. Musalimov ◽  
Y. Monahov ◽  
M. Tamre ◽  
D. Rõbak ◽  
A. Sivitski ◽  
...  
Keyword(s):  
Knee Joint ◽  
Sagittal Plane ◽  
Low Cost ◽  
Lower Limbs ◽  
Human Knee ◽  
Human Knee Joint ◽  
Healthy Knee ◽  
Knee Joint Motion ◽  
Injured Knee ◽  
Active Orthosis

AbstractThe article discusses motion of a healthy knee joint in the sagittal plane and motion of an injured knee joint supported by an active orthosis. A kinematic scheme of a mechanism for the simulation of a knee joint motion is developed and motion of healthy and injured knee joints are modelled in Matlab. Angles between links, which simulate the femur and tibia are controlled by Simulink block of Model predictive control (MPC). The results of simulation have been compared with several samples of real motion of the human knee joint obtained from motion capture systems. On the basis of these analyses and also of the analysis of the forces in human lower limbs created at motion, an active smart orthosis is developed. The orthosis design was optimized to achieve an energy saving system with sufficient anatomy, necessary reliability, easy exploitation and low cost. With the orthosis it is possible to unload the knee joint, and also partially or fully compensate muscle forces required for the bending of the lower limb.

The tidemark of the chondro-osseous junction of the normal human knee joint

2005 ◽  
Vol 36 (3) ◽  
pp. 207-215 ◽  
Author(s):  
T.J. Lyons ◽  
R.W. Stoddart ◽  
S.F. McClure ◽  
J. McClure
Keyword(s):  
Knee Joint ◽  
Human Knee ◽  
Human Knee Joint ◽  
Normal Human

Accuracy of an electromagnetic measurement device and application to the measurement and description of knee joint motion

1998 ◽  
Vol 212 (5) ◽  
pp. 347-355 ◽  
Author(s):  
A M J Bull ◽  
F H Berkshire ◽  
A A Amis
Keyword(s):  
Knee Joint ◽  
Positional Error ◽  
Joint Motion ◽  
Step Size ◽  
Measurement Device ◽  
Human Knee ◽  
Multiple Receivers ◽  
Human Knee Joint ◽  
Knee Joint Motion ◽  
Electromagnetic Measurement

The aims of this study were to analyse the accuracy and sensitivity to metals of an electromagnetic motion measurement device and to use it to provide a description of motion of the human knee joint. A calibrated grid and sine bar were used to measure translational and rotational accuracy, which were found to be ±0.23 per cent of the step size (translation) and ±2.0 per cent of the step size (rotation) within an optimal operational zone of minimal positional error for which the receiver to transmitter separation was between 271 and 723 mm. The presence of multiple receivers was found to have a significant effect on the accuracy only when positioned within 30 mm of one another. Mild steel was found to have a significant detrimental effect when within 150 mm of the transmitter or receiver. A stainless steel bone screw had no effect on the accuracy of the device. A mathematical description of knee joint motion is presented which describes the motion in terms of clinical rotations. The device is a useful tool for measuring joint motion in the operating theatre and laboratory, owing to its accuracy and insensitivity to surgical alloys.

The reproducibility of passive human knee-joint motion characteristics

1985 ◽  
Vol 18 (7) ◽  
pp. 529-530
Author(s):  
L. Blankevoort ◽  
R. Huiskes ◽  
A. de Lange
Keyword(s):  
Knee Joint ◽  
Joint Motion ◽  
Human Knee ◽  
Human Knee Joint ◽  
Knee Joint Motion ◽  
Motion Characteristics

scholarly journals Inverse Modeling of Human Knee Joint Based on Geometry and Vision Systems for Exoskeleton Applications

2015 ◽  
Vol 2015 ◽  
pp. 1-14 ◽  
Author(s):  
Eduardo Piña-Martínez ◽  
Ernesto Rodriguez-Leal
Keyword(s):  
Knee Joint ◽  
Vision System ◽  
Kinematic Model ◽  
Measurement Tool ◽  
Vision Systems ◽  
Severe Injuries ◽  
Center Of Rotation ◽  
Human Knee ◽  
Human Knee Joint ◽  
Instantaneous Center

Current trends in Robotics aim to close the gap that separates technology and humans, bringing novel robotic devices in order to improve human performance. Although robotic exoskeletons represent a breakthrough in mobility enhancement, there are design challenges related to the forces exerted to the users’ joints that result in severe injuries. This occurs due to the fact that most of the current developments consider the joints as noninvariant rotational axes. This paper proposes the use of commercial vision systems in order to perform biomimetic joint design for robotic exoskeletons. This work proposes a kinematic model based on irregular shaped cams as the joint mechanism that emulates the bone-to-bone joints in the human body. The paper follows a geometric approach for determining the location of the instantaneous center of rotation in order to design the cam contours. Furthermore, the use of a commercial vision system is proposed as the main measurement tool due to its noninvasive feature and for allowing subjects under measurement to move freely. The application of this method resulted in relevant information about the displacements of the instantaneous center of rotation at the human knee joint.

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