An international modified-Delphi panel developed a concise clinical definition of spasticity as a sensorimotor-control disorder caused by upper motor-neuron disease, characterised by involuntary muscle overactivity that is velocity- and length-dependent, intermittent or sustained during passive stretch. Consensus can improve communication, but does not prove better diagnosis or outcomes.
Key findings
- The final definition states: a disorder of sensorimotor control from upper motor-neuron disease, characterised by velocity- and length-dependent involuntary muscle overactivity, intermittent or sustained during passive stretch. Earlier definitions were considered too narrow or clinically incomplete.
Why this matters globally
A common definition may standardise research, records and multidisciplinary communication, but operational criteria, inter-rater reliability, construct validity and decision impact still require testing.
Thai researcher contribution
Areerat Suputtitada of Chulalongkorn University and King Chulalongkorn Memorial Hospital joined the international panel, bringing Thai rehabilitation expertise into a global consensus.
Limitations to consider
Panel composition and patient, regional and professional representation shape consensus. Round-specific thresholds are not in the abstract, and consensus cannot replace diagnostic-accuracy testing or future revision.