Does this help?: 'cogwheel' rigidity and 'leadpipe' rigidity are two types identified with parkinson's disease. 'leadpipe' rigidity results when an increase in muscle tone causes a sustained resistance to passive movement throughout the whole range of motion, with no fluctuations.'cogwheel' rigidity is a combination of leadpipe rigidity and tremor which presents as a jerky resistance to passive movement.
Answered 10/12/2018
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