Medical Definition of TONUS. 1. : tone 2a. 2. : a state of partial contraction that is characteristic of normal muscle, is maintained at least in part by a continuous bombardment of motor impulses originating reflexly, and serves to maintain body postureâcalled also muscle tone; compare clonus.
Neuralgia is the definitive term for nerve pain. Words ending in -algia indicate pain. A closely related word is neuropathy. It indicates an injury, disease, deterioration, defect or other abnormality of the nerve, which usually produces pain, pos...
The medical terminology used for pain is usually the suffix -algia. The knee is a joint; joints are denotes by the prefix arthr-. Therefore arthralgia is a proper term in the case where the knee joint itself is the cause of pain, and not inflammation of surrounding tissue (as in the case of cellulitis) or underlying bone (ostitis).