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Signs
 
 

Spasticity

 
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Overview

Spasticity, or clasp-knife rigidity, is a velocity-dependent increase in tone seen with rapid flexion or extension of a joint.
  • How to Assess

  • Rapidly flex or extend the elbow or knee joint, assessing for a sudden increase in resistance.
  • Significance

  • Suggests the presence of an upper motor neuron lesion.
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