cogwheel rigidity

noun
cog·​wheel rigidity | \ ˈkäg-ˌ(h)wēl- How to pronounce cogwheel rigidity (audio) \

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

called also cogwheeling

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Dictionary Entries Near cogwheel rigidity

cogwheeling

cogwheel rigidity

COH

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Cite this Entry

“Cogwheel rigidity.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/cogwheel%20rigidity. Accessed 7 Jul. 2022.

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