clasp-knife spasticity

Medical Dictionary

clasp-knife spasticity n.
Rigidity of the extensor muscles of a joint that gives resistance to passive flexion but gives way abruptly to allow easy flexion, resulting from an exaggeration of the stretch reflex. Also called clasp-knife rigidity.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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