2P2-D07 Development of Knee Joint Robot with Rotational Movement : Verification Experiments of Imitation of Knee Joint Movement of Healthy and Disable Persons(Rehabilitation Robotics and Mechatronics)

2011 ◽  
Vol 2011 (0) ◽  
pp. _2P2-D07_1-_2P2-D07_4
Author(s):  
Tatsuya HIRANO ◽  
Yusuke HAYASHI ◽  
Yoshifumi MORITA ◽  
Hiroyuki UKAI ◽  
Kouji SANAKA ◽  
...  
Keyword(s):  
Knee Joint ◽  
Rehabilitation Robotics ◽  
Joint Movement ◽  
Rotational Movement

Modeling the resistance mechanism of passive knee joint flexion and extension for use in rehabilitation equipment

2021 ◽  
pp. 095441192199013
Author(s):  
Mansoor Amiri ◽  
Farhad Tabatabai Ghomsheh ◽  
Farshad Ghazalian
Keyword(s):  
Knee Joint ◽  
Sagittal Plane ◽  
Resistance Mechanism ◽  
Time Dependent ◽  
Coefficient Of Determination ◽  
Joint Movement ◽  
Elastic Coefficient ◽  
Knee Movement ◽  
Joint Flexion ◽  
Flexion And Extension

The purpose of this study was to model the resistance mechanism of Passive Knee Joint Flexion and Extension to create a similar torque mechanism in rehabilitation equipment. In order to better model the behavior of passive knee tissues, it is necessary to exactly calculate the two coefficients of elasticity of time-independent and time-dependent parts. Ten healthy male volunteers (mean height 176.4+/−4.59 cm) participated in this study. Passive knee joint flexion and extension occurred at velocities of 15, 45, and 120 (degree/s), and in five consecutive cycles and within the range of 0 to 100° of knee movement on the sagittal plane on Cybex isokinetic dynamometer. To ensure that the muscles were relaxed, the electrical activity of knee muscles was recorded. The elastic coefficient, (KS) increased with elevating the passive velocity in flexion and extension. The elastic coefficient, (KP) was observed to grow with the passive velocity increase. While, the viscous coefficient (C) diminished with passive velocity rise in extension and flexion. The heightened passive velocity of the motion resulted in increased hysteresis (at a rate of 42%). The desired of passive velocity is lower so that there is less energy lost and the viscoelastic resistance of the tissue in the movement decreases. The Coefficient of Determination, R2 between the model-responses and experimental curves in the extension was 0.96 < R2 < 0.99 and in flexion was 0.95 < R2 < 0.99. This modeling is capable of predicting the true performance of the components of passive knee movement and we can create a resistance mechanism in the rehabilitation equipment to perform knee joint movement. Quantitative measurements of two elastic coefficients of Time-independent and Time-dependent parts passive knee joint coefficients should be used for better accurate simulation the behavior of passive tissues in the knee which is not seen in other studies.

Reciprocal Coactivation Patterns of the Lateral and Medial Quadriceps and Hamstrings during Low- and Moderate-Speed Isokinetic Movement

1998 ◽  
Vol 7 (3) ◽  
pp. 182-196 ◽  
Author(s):  
Ronald V. Croce ◽  
John P. Miller ◽  
Robert Confessore ◽  
James C. Vailas
Keyword(s):  
Knee Joint ◽  
Female Athletes ◽  
Vastus Lateralis ◽  
Biceps Femoris ◽  
Median Frequency ◽  
Vastus Medialis ◽  
Mean Square ◽  
Joint Movement ◽  
Surface Electrodes ◽  
Emg Patterns

The purpose of this study was to examine coactivation patterns of the lateral and medial quadriceps and the lateral and medial hamstrings during low- and moderate-speed isokinetic movements. Twelve female athletes performed isokinetic knee assessments at 60 and 180°/s. Root mean square electromyographic (rmsEMG) activity and the median frequency of the EMG (mfEMG) were determined by placing bipolar surface electrodes on the vastus lateralis (VL), vastus medialis (VM), biceps femoris (BF), and medial hamstrings (MH). Results of rmsEMG indicated that the VM showed almost twice the coactivation of the VL (p< .05), and that the BF showed almost four times the coactivation of the MH (p <.05). Finally, differences were noted in the mfEMG (p< .05), with the VM displaying different recruitment patterns at 180°/s as an agonist compared to that as an antagonist. Results indicated that when acting as antagonists, the VM and BE display the greatest EMG patterns during isokinetic knee joint movement.

scholarly journals Development and Examination of a Knee Prosthesis Geometry

2019 ◽  
Vol 11 (1) ◽  
pp. 27-30
Author(s):  
Gábor Péter Balassa
Keyword(s):  
Knee Joint ◽  
Research Team ◽  
Knee Prosthesis ◽  
Experimental Measurements ◽  
Joint Movement ◽  
Knee Prostheses ◽  
Healthy Human ◽  
Human Knee ◽  
Human Knee Joint ◽  
Number Of Patients

Abstract The necessity for the knee prosthesis is confirmed by the large increase in the number of patients suffering from arthrosis, which is a present-day disease. Despite this need, there doesn’t exist an optimal knee prosthesis. Nowadays the development of the knee prostheses is progressing. It is very difficult to define the required geometry with traditional methods, because the movement conditions to be created by the prostheses should be similar to the movements of the human knee. During previous research the biomechanical research team of the Szent István University occupied with experimental measurements of the healthy human knee joint movement. In this paper I would like to introduce a method of prosthesis geometry development. As a result, a knee prosthesis geometry has been created which is approaching the movement form of the real human knee joint.

scholarly journals A Textile Sensor for Long Durations of Human Motion Capture

Sensors ◽  
2019 ◽  
Vol 19 (10) ◽  
pp. 2369 ◽  
Author(s):  
Sufeng Hu ◽  
Miaoding Dai ◽  
Tianyun Dong ◽  
Tao Liu
Keyword(s):  
Knee Joint ◽  
Motion Capture ◽  
Sports Medicine ◽  
Low Cost ◽  
Movement Analysis ◽  
Human Motion ◽  
Joint Movement ◽  
Human Motion Capture ◽  
Knee Joint Motion ◽  
Textile Sensor

Human posture and movement analysis is important in the areas of rehabilitation, sports medicine, and virtual training. However, the development of sensors with good accuracy, low cost, light weight, and suitability for long durations of human motion capture is still an ongoing issue. In this paper, a new flexible textile sensor for knee joint movement measurements was developed by using ordinary fabrics and conductive yarns. An electrogoniometer was adopted as a standard reference to calibrate the proposed sensor and validate its accuracy. The knee movements of different daily activities were performed to evaluate the performance of the sensor. The results show that the proposed sensor could be used to monitor knee joint motion in everyday life with acceptable accuracy.

Three-Dimensional Analysis of Knee Joint Movement with Biplanar Photography, with Special Reference to the Analysis of ‘dynamic’ Knee Instabilities

1993 ◽  
Vol 207 (3) ◽  
pp. 163-173 ◽  
Author(s):  
H Matsumoto ◽  
B B Seedhom
Keyword(s):  
Knee Joint ◽  
Pivot Shift ◽  
Three Dimensional ◽  
Sufficient Accuracy ◽  
Three Dimensions ◽  
Joint Movement ◽  
Step Method ◽  
Actual Measurement ◽  
Knee Movement ◽  
Cadaveric Knee

An apparatus was developed by means of which it was possible to move a cadaveric knee joint under a constant external force and to measure its movement in three dimensions using biplanar photography, to investigate mechanisms of ‘dynamic’ knee instabilities, such as the ‘pivot shift’ phenomenon. Two wire frameworks, one attached to the femur, the other to the tibia, defined a system of three mutually orthogonal axes. While the knee joint was moved under a given force, a series of biplanar photographs of the two frameworks were taken. This procedure was repeated after sectioning different ligaments simulating different injuries. The joint was finally fully disarticulated, but leaving the reference wire frameworks still attached to their respective bone. Another series of biplanar photographs of the femur and tibia were taken. From these two series of measurements, movements of the tibia with respect to the femur were calculated. With this two-step method, knee movements could be measured without damaging the knee structures before or during the actual measurement (which could change the knee movement itself). On validating the system, it was concluded that knee movement could be measured with sufficient accuracy for the analysis of knee instability.

Bioreactor mimicking knee-joint movement for the regeneration of tissue-engineered cartilage

2019 ◽  
Vol 33 (4) ◽  
pp. 1841-1850 ◽  
Author(s):  
Hun-Jin Jeong ◽  
So-Jung Gwak ◽  
Nae-Un Kang ◽  
Myoung Wha Hong ◽  
Young Yul Kim ◽  
...  
Keyword(s):  
Knee Joint ◽  
Joint Movement ◽  
Engineered Cartilage
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