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Dynamic Threshold Model of Spasticity that Can Predict Various Pendulum Motions  

Kim Chul-Seung (건국대학교 일반대학원 의공학과)
Kong Se-Jin (건국대학교 일반대학원 의공학과)
Kwon Sun-Duck (건국대학교 의과대학 재활의학과)
Kim Jong-Moon (건국대학교 의과대학 재활의학과)
Eom Gwang-Moon (건국대학교 의공학부, 건국대학교 의공학실용연구소)
Publication Information
Journal of the Korean Society for Precision Engineering / v.23, no.7, 2006 , pp. 152-158 More about this Journal
Abstract
The objective of this work is to develop the knee joint model for representing various pendulum motions and quantifying the spasticity. Knee joint model included the extension and flexion muscles. The joint moment consists of both the active moment from the stretch reflex and the passive moment from the viscoelastic joint properties. The stretch reflex was modeled as nonlinear feedback of muscle length and the muscle lengthening velocity, which is Physiologically-feasible. Moreover, we modeled the spastic reflex as having dynamic threshold to account far the various pendulum trajectories of spastic patients. We determined the model parameters of three patients who showed different pendulum trajectories through minimization of error between experimental and simulated trajectories. The simulated joint trajectories closely matched with the experimental ones, which show the proposed model can predict pendulum motions of patients with different spastic severities. The predicted muscle force from spastic reflex appeared more frequently in the severe spastic patient, which indicates the dynamic threshold relaxes slowly in this patient as is manifested by the variation coefficient of dynamic threshold. The proposed method provides prediction of muscle force and intuitive and objective evaluation of spasticity and it is expected to be useful in quantitative assessment of spasticity.
Keywords
spasticity; pendulum test; knee joint model; stretch reflex model;
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Times Cited By KSCI : 3  (Citation Analysis)
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1 Pandyan, A. D., Johnson, G. R., Curless, R. H., Price, C. I. M., Barnes, M. P. and Rodgers, H., 'A review of the properties and limitations of the ashworth and modified ashworth scales as measures of spasticity,' Clinical rehabilitation, Vol. 13, pp. 373-383, 1999   DOI
2 Eom, G. M., Lee, C. H., Kim, C. S. and Heo. J. U., 'Nonlinear damper model for the quantification of joint mechanical properties,' J. Korean Society of Precision Engineering, Vol. 22, No. 4, 2005   과학기술학회마을
3 Granata, K. P., Ikeda, A. J. and Abel, M. K., 'Electromechanical delay and reflex response in spastic cerebral palsy,' Arch Phys Med Rehabil, Vol. 81, 2000   DOI   ScienceOn
4 Katz, R. T., Rovral, G. P., Brait, C. and Rymer, W.Z., 'Objective quantification of spastic hypertonia:mechanisms and measurement,' Arch Phys Med Rehabil, Vol.73, pp.339-347,1992   DOI   ScienceOn
5 Eom, G. M., Kim, C. S., Kong, S. J., Kim, J. M. and Lee, S. H., 'Identification of knee joint spasticity using pendulum movement test,' J. Korean Society f Precision Engineering, Vol.22, No.11, 2005   과학기술학회마을
6 James, W. F. Jr. and Richard, A. F., 'Neuromuscular modeling of spasticity in cerebral palsy,'IEEE Trans. Neural Sys.&Rehab. Eng., Vol. 12, pp. 55-64, 2004   DOI   ScienceOn
7 Goldberg, D. E., 'Genetic algorithms in search, optimization and machine learning,' New York, Addison Wesley, 1989
8 Dejong, K., 'An analysis of the behavior of a class of genetic adaptive system,' Ph.d. Thesis, Uiv. of Michigan, 1975
9 Eom, G. M., Kim, C. S. and Hase, K., 'Implementation of FES cycling using only knee muscles: a computer simulation study,' J. Korean Society of Precision Engineering,' Vol. 21, No. 8, 2004   과학기술학회마을
10 Assunta, P., Giovanna, C., Catuscia, F., Sonia, V. and Antonello, G. 'Evaluation of upper-limb spasticity after stroke: a clinical and neurophysiologic study,' Arch Phys Med Rehabil, Vol. 86, pp. 410-415, 2005   DOI   ScienceOn
11 Warternberg, R., 'Pendulousness of the legs as a diagnostic test,' Neurology, Vol.1,pp.18-24, 1951   DOI
12 Bajd, T. and Vodovnik, L., 'Pendulum testing of spasticity,' J Biomed Eng, Vol. 6, pp.9-16, 1984   DOI
13 Lee, E. W., Cho. K. H. and Kim, B. O., 'An evaluation of spasticity using pendulum test and dynamic electromyography,' J. of Korean Acad. of Rehab. Med., Vol.23,No.3,1999
14 Lee, S. J., Kwon, B. S. and Park, S. T., 'The assessment of spasticity using isokinetic eccentric torque measurement,' J. of Korean Acad. of Rehab. Med., Vol.23, No.4, 1999
15 Sheean, G.,'The pathophysiology of spasticity,' Eur J Neurol, Vol. 9, No. 1, pp.3-9, 2002   DOI   ScienceOn
16 Elovic, E. P., Simone, L. K. and Zafonte, R., 'Outcome assessment for spasticity management in the patient with traumatic brain injury: the state of the art,' J Head Trauma Rehabit, Vol.19,No.2,pp.155-177,2004   DOI   ScienceOn