Background: Injuries to the shafts of radius and ulna are one of the most common reasons for children to receive orthopedic care. The purpose of this study was to evaluate the radiological and clinical outcome of fracture both bone forearm in children treated by elastic nail. Patients and methods: This clinical trial was conducted on 18 patients with fracture shaft of both bone forearm treated by elastic stable intramedullary nail (ESIN) in Zagazig University Hospital, Egypt, and Emhamed Almaqrif Hospital Educational Center, Ajdabia, Libya. It was conducted to evaluate the radiological and clinical outcome of fracture both bone forearm in children treated by elastic stable intramedullary nail. Results: The mean time to union was 9.94 (SD 2.01) weeks with minimum 7 and maximum 14 weeks. According to the Mayo score majority were excellent 61.1%, then good 27.8% and finally fair 11.1%, and only 4 cases 22.2% had complication (2 surgical site infections, 1 superficial radial nerve injury, and 1 nonunion). Conclusion: ESIN is secure and suitable for young children for the treatment of displaced forearm fractures.