Spasticity or reversible muscle hypertonia?

The increase in resistance to passive muscle stretch in a paretic limb due to an upper motor neurone lesion is often referred to as muscle spasticity. However, this terminology is inaccurate and does not take into account the complex pathogenesis of the condition or describe the factors that contribute to the clinically observed changes in muscle tone. In this report we propose an alternative terminology and explain the reasons for doing so.