clasp-knife spasticity


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