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Medical Term:

clasp-knife spasticity


a type of increased muscle tone due to a pyramidal tract lesion, in which abnormally increased resistance to passive stretch of a muscle abruptly decreases; typically, this appears near the end of the range of joint excursion.

Synonym(s): clasp-knife effect, clasp-knife rigidity

See Also: lengthening reaction

© Copyright 2017 Wolters Kluwer. All Rights Reserved. Review Date: Sep 19, 2016.