You searched for: “clasp knife rigidity
clasp-knife rigidity, clasp-knife effect, clasp-knife spasticity, clasp-knife phenomenon
1. A condition in which passive flexion of a joint causes increased resistance of the extensors.

This gives way abruptly if the pressure to produce flexion is continued.

2. An initial marked resistance to passive movement, which then suddenly gives way.

This variety of increased muscle tone is characteristic of spasticity as a result of disease or dysfunction of the pyramidal tracts.

This entry is located in the following unit: rigi-, rig- (page 1)