A Detailed Model for Knee Joint Acceleration Motions Obtained by Pendulum Test

2009 ◽  
pp. 472-475 ◽  
Author(s):  
K. Jikuya ◽  
H. Michinishi ◽  
T. Nakamura ◽  
T. Kusuhara ◽  
Y. Yamamoto ◽  
...  
Keyword(s):  
Knee Joint ◽  
Detailed Model ◽  
Pendulum Test ◽  
Joint Acceleration

scholarly journals Pendulum test: Quantified assessment of the type and level of spasticity in persons with central nervous system lesions

2018 ◽  
Vol 15 (1) ◽  
pp. 1-12 ◽  
Author(s):  
Dejan Popovic ◽  
Tadej Bajd
Keyword(s):  
Central Nervous System ◽  
Nervous System ◽  
Knee Joint ◽  
Soft Tissues ◽  
Technological Development ◽  
Lower Leg ◽  
Elastic Stiffness ◽  
Joint Torque ◽  
Good Representation ◽  
Pendulum Test

The development of a comprehensive computational model of the pendulum test which is appropriate for the analysis of the pathologic behavior of the leg in humans with the central nervous system (CNS) lesion is presented in this review. The model relates to the pendulum movement of the lower leg (shank and the foot) in the lateral plane due to the gravity and involuntary contractions of the muscles. The viscous damping and elastic stiffness reflect the soft tissues and friction in the knee joint. To quantify the pathologic activity of paralyzed muscles a reflex torque was added to the gravity generated knee joint torque. The knee joint encoder, accelerometers and gyroscopes positioned along the shank and thigh, and EMG amplifiers were used to acquire data for the illustration of the validity of the model. We show that the linear model of the movement of the lower leg is not a good representation of the motor impairment. We show that the model expanded with the reflex torque affecting the movement is well suited for the pendulum analysis. The timing of the reflex torques can be determined from the EMG recordings. [Project of the Serbian Ministry of Education, Science and Technological Development, Grant no. TR35003] <br><br><font color="red"><b> This article has been corrected. Link to the correction <u><a href="http://dx.doi.org/10.2298/SJEE2002257E">10.2298/SJEE2002257E</a><u></b></font>

Detection of knee-joint motions using two linear accelerometers for pendulum test

2012 ◽  
Vol 95 (7) ◽  
pp. 41-48 ◽  
Author(s):  
Toshimasa Kusuhara ◽  
Kazuaki Jikuya ◽  
Takao Nakamura ◽  
Hiroyuki Michinishi ◽  
Yoshitake Yamamoto ◽  
...  
Keyword(s):  
Knee Joint ◽  
Pendulum Test ◽  
Joint Motions

scholarly journals Functional assessments of the knee joint biomechanics by using pendulum test in adults with Down syndrome

2012 ◽  
Vol 113 (11) ◽  
pp. 1747-1755 ◽  
Author(s):  
Antonino Casabona ◽  
Maria Stella Valle ◽  
Mariangela Pisasale ◽  
Maria Rosita Pantò ◽  
Matteo Cioni
Keyword(s):  
Down Syndrome ◽  
Knee Joint ◽  
Muscle Activation ◽  
Rectus Femoris ◽  
Emg Activity ◽  
Pendulum Test ◽  
Joint Resistance ◽  
Leg Flexion ◽  
Joint Biomechanics ◽  
Muscle Hypotonia

In this study, we assessed kinematics and viscoelastic features of knee joint in adults with Down syndrome (DS) by means of the Wartenberg pendulum test. This test allows the measuring of the kinematics of the knee joint during passive pendular motion of leg under the influence of gravity. In addition, by a combination of kinematic and anthropometric data, pendulum test provides estimates of joint viscoelastic properties by computing damping and stiffness coefficients. To monitor the occurrences of muscle activation, the surface electromyogram (EMG) of muscle rectus femoris was recorded. The experimental protocol was performed in a group of 10 adults with DS compared with 10 control adults without DS. Joint motion amplitude, velocity, and acceleration of the leg during the first knee flexion significantly decreased in persons with DS with respect to those without DS. This behavior was associated with the activation of rectus femoris in subjects with DS that resulted in increasing of joint resistance shortly after the onset of the first leg flexion. The EMG bursts mostly occurred between 50 and 150 ms from the leg flexion onset. During the remaining cycles of pendular motion, persons with DS exhibited passive leg oscillations with low tonic EMG activity and reduced damping coefficient compared with control subjects. These results suggest that adults with DS might perform preprogrammed contractions to increase joint resistance and compensate for inherent joint instability occurring for quick and unpredictable perturbations. The reduction of damping coefficients observed during passive oscillations could be a predictor of muscle hypotonia.

Detection Method of Knee-joint Motions Using Two Linear Accelerometers for Pendulum Test

2011 ◽  
Vol 131 (9) ◽  
pp. 1564-1569
Author(s):  
Toshimasa Kusuhara ◽  
Kazuaki Jikuya ◽  
Takao Nakamura ◽  
Hiroyuki Michinishi ◽  
Yoshitake Yamamoto ◽  
...  
Keyword(s):  
Knee Joint ◽  
Detection Method ◽  
Pendulum Test ◽  
Joint Motions

J022021 Frictional and Viscoelastic Properties of Knee Joint Cartilage by Pendulum Test

2012 ◽  
Vol 2012 (0) ◽  
pp. _J022021-1-_J022021-3
Author(s):  
Shintaro KASHIWA ◽  
Hiroyuki TODOH ◽  
Shigeru TADANO ◽  
Masanori IWASAKI
Keyword(s):  
Knee Joint ◽  
Viscoelastic Properties ◽  
Joint Cartilage ◽  
Pendulum Test

Knee joint kinematics of the pendulum test in children with and without Down syndrome

2020 ◽  
Vol 76 ◽  
pp. 311-317 ◽  
Author(s):  
Diego M. Ferreira ◽  
Huaqing Liang ◽  
Jianhua Wu
Keyword(s):  
Down Syndrome ◽  
Knee Joint ◽  
Joint Kinematics ◽  
Pendulum Test ◽  
Knee Joint Kinematics

scholarly journals Use of instrumented spasticity tests in clinical applications. Preliminary results

2015 ◽  
Vol 7 (1) ◽  
Author(s):  
Ewa Szczerbik ◽  
Małgorzata Kalinowska ◽  
Krzysztof Graff ◽  
Dorota Olczak-Kowalczyk ◽  
Anna Dąbrowska-Gontarczyk ◽  
...  
Keyword(s):  
Knee Joint ◽  
Muscle Activity ◽  
Joint Angle ◽  
Correlation Coefficients ◽  
Clinical Applications ◽  
Clinical Tests ◽  
Preliminary Results ◽  
Knee Joint Angle ◽  
Dynamic Movement ◽  
Pendulum Test

Summary Study aim: the aim of the study was to evaluate whether the use of instrumented versions of spasticity tests would provide us with clinically more useful information on the patient’s status. Material and methods: the study included 19 children, 8–17 years old: 7 girls and 12 boys. Pendulum, velocity, and popliteal tests were performed using the Vicon system (knee joint angle, 8 muscles EMG). Dynamic movement ranges of the knee joint during velocity and popliteal tests (ROM), indices of the pendulum test, and muscle activity in dependence of velocity of movement (MA, MAST) were calculated. Correlation coefficients between ROM, Vmax, MA, and MAST were calculated to show whether instrumentation of clinical tests can validate the patient’s status more precisely. Results: Vmax value from the pendulum test does not always correlate with ROM. Scores of MA and MAST do not correlate with ROM. Vmax generally does not correlate with MA or MAST. Conclusions: ROM is one of the most important parameters reflecting the level of spasticity but it is not sensitive enough to detect small changes in the patient’s status. In that case, Vmax of the pendulum test and the number of activated muscles in velocity and popliteal tests could become important tools to assess changes in spasticity level, especially when motion systems are more commonly available.

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