Spasticity was quantified in nine children with spastic diplegia, using a sinusoidal displacement of the foot at frequencies from 3 to 12Hz. Ankle-joint stiffness was separated into elastic (energy-storing) and viscous (energy-dissipating) components. 'Path length' was used to represent the variation in stiffness over this frequency range. Compared with 11 unaffected children, a significant difference in path lengths was demonstrated for the children with spasticity. An age-dependent effect was demonstrated when path lengths of unaffected children were compared with those of 10 unaffected adults. A modified path-length measure is proposed which minimizes age dependency, yet enables detection of spasticity. Passive stiffness properties of unaffected adults showed higher elastic stiffness, viscosity and friction than unaffected children. A method was developed to evade the need for temporary nerve blocks to calculate inerital properties of the foot in persons with spasticity.
%0 Journal Article
%1 Price1991
%A Price, R.
%A Bjornson, K. F.
%A Lehmann, J. F.
%A McLaughlin, J. F.
%A Hays, R. M.
%D 1991
%J Dev Med Child Neurol
%K Biomechanics; Cerebral Palsy; Child; Child, Preschool; Female; Humans; Male; Motor Neurons; Muscle Spasticity; Muscles; Neurologic Examination; Range of Motion, Articular; Reflex, Abnormal; Stretch; Signal Processing, Computer-Assisted
%N 7
%P 585--595
%T Quantitative measurement of spasticity in children with cerebral palsy.
%V 33
%X Spasticity was quantified in nine children with spastic diplegia, using a sinusoidal displacement of the foot at frequencies from 3 to 12Hz. Ankle-joint stiffness was separated into elastic (energy-storing) and viscous (energy-dissipating) components. 'Path length' was used to represent the variation in stiffness over this frequency range. Compared with 11 unaffected children, a significant difference in path lengths was demonstrated for the children with spasticity. An age-dependent effect was demonstrated when path lengths of unaffected children were compared with those of 10 unaffected adults. A modified path-length measure is proposed which minimizes age dependency, yet enables detection of spasticity. Passive stiffness properties of unaffected adults showed higher elastic stiffness, viscosity and friction than unaffected children. A method was developed to evade the need for temporary nerve blocks to calculate inerital properties of the foot in persons with spasticity.
@article{Price1991,
abstract = {Spasticity was quantified in nine children with spastic diplegia, using a sinusoidal displacement of the foot at frequencies from 3 to 12Hz. Ankle-joint stiffness was separated into elastic (energy-storing) and viscous (energy-dissipating) components. 'Path length' was used to represent the variation in stiffness over this frequency range. Compared with 11 unaffected children, a significant difference in path lengths was demonstrated for the children with spasticity. An age-dependent effect was demonstrated when path lengths of unaffected children were compared with those of 10 unaffected adults. A modified path-length measure is proposed which minimizes age dependency, yet enables detection of spasticity. Passive stiffness properties of unaffected adults showed higher elastic stiffness, viscosity and friction than unaffected children. A method was developed to evade the need for temporary nerve blocks to calculate inerital properties of the foot in persons with spasticity.},
added-at = {2014-07-19T21:06:46.000+0200},
author = {Price, R. and Bjornson, K. F. and Lehmann, J. F. and McLaughlin, J. F. and Hays, R. M.},
biburl = {https://www.bibsonomy.org/bibtex/292b6bcd502cebd9a10337072975072af/ar0berts},
groups = {public},
interhash = {777831122a61d425dbc8b25bbd8b8b39},
intrahash = {92b6bcd502cebd9a10337072975072af},
journal = {Dev Med Child Neurol},
keywords = {Biomechanics; Cerebral Palsy; Child; Child, Preschool; Female; Humans; Male; Motor Neurons; Muscle Spasticity; Muscles; Neurologic Examination; Range of Motion, Articular; Reflex, Abnormal; Stretch; Signal Processing, Computer-Assisted},
month = Jul,
number = 7,
pages = {585--595},
pmid = {1879622},
timestamp = {2014-07-19T21:06:46.000+0200},
title = {Quantitative measurement of spasticity in children with cerebral palsy.},
username = {ar0berts},
volume = 33,
year = 1991
}