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Cogwheel rigidity

Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

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Cog-wheel rigidity is the phrase used to describe the feeling of periodic resistance to passive movement felt by the examiner in a parkinsonian limb. The phenomenon may be unilateral initially.

The cog-wheeling is in fact a tremor superimposed on lead pipe rigidity - the teeth of the cog are analogous to the tensed parts of the tremor.


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