Pediatric Neurology published recent research that injections of Botox A in the lower extremities in children with cerebral palsy did not effect upper extremity muscle strength. 

Reference:  Beth E. Crowner PT, DPT, MPPA and Brad A. Racette MD (2008)  Prospective Study Examining Remote Effects of Botulinum Toxin A in Children With Cerebral Palsy Pediatric Neurology  Volume 39, Issue 4, October 2008, Pages 253-258

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