Aim: In this study, it was aimed to compare the clinical and radiological results of the two different surgical methods for the treatment of forearm double bone diaphysis fractures in children at early and mid-adolescence (ages 10-16). Materials and Methods: Children aged between 10 and 16 years who underwent surgical treatment for a forearm double bone fracture between the years 2015-2019 were evaluated retrospectively after the approval of the local ethics committee. The patients were separated into two groups: TEN group included 34 patients for whom both bones were fixated with TEN following closed reduction; plate-screw osteosynthesis (PO) group included 18 patients who had fixation with PO following open reduction. Results: A total of 52 children with forearm double bone diaphysis fracture with the mean age of 12.40±1.79 (10-16) years, 86.5% (n=45) of whom were males and 53.8% (n=28) had left side fracture were followed up for 30.40±14.03 (12-64) months. When the data of both groups were compared, it was observed that average union time was shorter compared with the PO group and the difference was statistically significant (p=0.007). When the functional results and complication rates of the two groups were compared, there was no statistically significant difference found between the two groups (p=0.756 and p=0.052, respectively). When the number of radiographs of both groups was compared, it was observed that the number of radiographs during the operation, during implant extraction, and total radiography was higher in the TEN group compared with the PO group and that the difference was statistically significant (p=0.000, p=0.002, p=0.000, respectively). Discussion: TEN after closed reduction can be safely preferred for pre-adolescent period children with adequate remodeling capacity and incomplete skeletal maturity because of its positive outcomes including less operation and hospital stay duration, fast union, better cosmetic results. However, plate-screw following open reduction can be preferred for mid-adolescent period children with complete or near-complete skeletal maturity and limited remodeling capacity because of its positive aspects such as rigid fixation, anatomic reduction, and less radiation exposure.