Botulinum toxin injection for childhood constipation is safe and can be effective regardless of anal sphincter dynamics.
Zar-Kessler C, Kuo B, Belkind-Gerson J. Botulinum toxin injection for childhood constipation is safe and can be effective regardless of anal sphincter dynamics. J Pediatr Surg. 2018 Apr; 53(4):693-697.