Abstract: Objective To evaluate the effect of Botulinum Toxin A (BTX-A) on spastic diplegia by surface electromyography (sEMG). Methods 50 children with cerebral palsy following spastic diplegia were recruited and injected with BTX-A in triceps surae. They were assessed with the clinical test and the sEMG before and after the treatment. Results After the treatment, the integrated electromyography(iEMG) of triceps surae and foot dorsiflexion angle all decreased. Conclusion sEMG is an objective tool to assess the change of spasticity in children with diplegia after BTX-A injection.

Key words: cerebral palsy, spastic diplegia, Botulinum Toxin A, surface electromyography, spasm