cogwheel rigidity

noun
cog·​wheel rigidity | \ˈkäg-ˌ(h)wēl- \

Medical Definition of cogwheel rigidity 

: muscular rigidity in which passive movement of the limbs (as during a physical examination) elicits ratchet-like start-and stop movements through the range of motion of a joint (as of the elbow) and that occurs especially in individuals affected with Parkinson's disease The third major sign, rigidity (sometimes called "cogwheel" rigidity), is peculiar to Parkinson's disease. When a limb is bent, it seems to catch at regular points throughout its range of motion, much as a second hand jerks from interval to interval instead of smoothly traversing the face of a clock.— Harriet Washington, The Harvard Medical School Health Letter, May 1993

called also cogwheeling

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