clasp knife phenomenon
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.
clasp knife phenomenonNeurology A manifestation of corticospinal spasticity, in which there is ↑ tone in either flexion or extension with sudden relaxation, as the muscle continues to be stretched, imparting a sensation likened to that of an opening clasp knife; the CKP is often accompanied by weakness of the affected extremity, ↑ tendon reflexes, and a Babinski sign. Cf Cogwheel phenomenon, Gegenhalten.
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.