Background:Nowadays pediatric femoral fractures are more commonly managed with operative treatment rather than conservative treatment because of more rapid recovery and avoidance of prolonged immobilization.Children between the ages of 5-13 years are treated either by traction plus hip spica and flexible/elastic stable retrograde intramedullary nail,or external fixators in the case of open fractures.The aim of this study is to evaluate the outcome of pediatric femoral shaft fractures treated by stainless steel flexible intramedullary nail in children between 5 and 13 years of age.Methods:There were 32 cases of femoral shaft fractures which were all fixed with stainless steel flexible intramedullary nail under fluoroscopy.Long leg cast was applied at the time of fixation.Partial weight bearing was started 2 weeks after surgery.Patients were evaluated in follow-up study to observe the alignment of fracture,infection,delayed union,nonunion,limb length discrepancy,motion of knee joint,and time to unite the fracture.Results:We were able to follow up 28 out of 32 patients.The patients were 8.14 years of age on average.The mean hospital stay after operation was 4 days and fracture union time was 9.57 weeks.There were 3 cases of varus angulation,2 cases of anterior angulation,and 4 cases of limb lengthening.Conclusion:Patients aged between 5 and 13 years treated with flexible intramedullary nail for closed femoral shaft fracture have rapid union and recovery,short rehabilitation period,less immobilization and psychological impact,and cost-effective.