Abstract： Objective To explore the efficacies of subtalar arthrorisis correction in pediatric flexible flatfoot.Methods From August 2012 to October 2013,retrospective analyses were conducted for 1 5 flexible flatfoot cases undergoing subtalar arthrorisis.We measured the talo calcaneal angles and talar-first metatarsal angles on anteroposterior films and talar-first metatarsal angles and talar decline angles on lateral films.At the same time,the Maryland Foot Score was employed to evaluate and analyze the preoperative and postoperative status.Results During a follow-up period of 6-20 months, there was no onset of vascular or nerve injuries for 14 patients.Postoperatively foot pain,arch collapse and other symptoms obviously improved.On anteroposterior films,anteroposterior distance angles declined from preoperative 26.6°±2.5°to postoperative 20.8°±2.1°(P <0.05),talar-first metatarsal angles decreased from preoperative 13.7°± 1 .8° to postoperative 6.4°± 1 .3° (P <0.05);on lateral films,talar angles declined from preoperative 27.9°± 2.4° to postoperative 20.7°± 2.2° (P < 0.05) while talar-first metatarsal angles decreased from preoperative 1 1 .4°± 1 .3° to postoperative 3.7°± 1 .1°(P <0.05).Before and after surgery,the mean Maryland foot scores rose from preoperative (58.2 ±6.7)points to (86.4±5.6)points post-operation(P <0.05).Conclusions As an effective treatment for flexible flatfoot,subtalar arthrorisis offers the advantages of simple operation,safety,mini-trauma, short operative duration,fewer postoperative complications and better outcomes.It is worthy of wider promotion and further development in clinic practice.