Lead-pipe rigidity
Lead-pipe rigidity is the term used to describe the hypertonicity felt in a parkinsonian limb throughout the range of movements of a joint. It is indicative of increased tone in all the sets of muscles around a joint. Lead-pipe rigidity, as with other forms of parkinsonian rigidity, may be more pronounced on one side.
Lead-pipe rigidity persists throughout the range of movement of a particular joint, as distinct from clasp knife rigidity which varies.
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