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Studies that have assessed botulinum toxin for the treatment of cerebral palsy in children rarely have provided reliable measures of spasticity. In this randomized, double-blind, controlled trial, 33 children (mean age, 5.5 years) with spastic diplegia received either placebo or injection of botulinum toxin type A (12 U/kg) at two sites in both gastrocnemius muscles.
Compared with children in the placebo group, those who received the toxin had a significant improvement in an electromechanical measure of spasticity at 3 weeks but not at 8, 12, or 24 weeks. Gross motor function, as assessed by a validated criterion reference tool, significantly improved at 24 weeks but not at 3 and 12 weeks. Other measures of muscle strength and movement tende…