children//Wumaojun1SangSang1 lizixuan2 Wang Jing 1 Song Bo1 Chen Min3 1.The Second Affiliated Hospital of Shandong First Medical University, Tai'an, Shandong 271000; 2. Shandong First Medical University, Tai'an, Shandong 271000；3.Cancer hospital of Tai'an City ,Shandong Tai'an 271000 Objective:To explore the feasibility of manual reduction and elastic intramedullary nail fixation of children's ulnar and radial fractures assisted by color ultrasound, so as to provide basis for clinical treatment of children's fractures. Methods: 60 children with ulnar and radial fractures and severe displacement who needed intramedullary nail fixation were divided into two groups: ultrasonic group and fluoroscopy group. The closed reduction and intramedullary nail fixation assisted by color ultrasound (ultrasonic group, n=30) was compared with the fracture reduction and intramedullary nail fixation under C-arm fluoroscopy (fluoroscopy group, n=30). The comparison was made by terms of the operation time, the success rate of the first closure, the incidence of postoperative complications and the functional recovery of the forearm after surgery, to evaluate the application value of ultrasound in the diagnosis and treatment of forearm fractures in children. Results:Both groups of children successfully completed the operation, and there were no serious complications such as nerve and blood vessel injury during the operation. The operation time and fluoroscopy times in ultrasound group were significantly less than those in fluoroscopy group (P<0.05). There was no significant difference in incision length and wound healing grade between the two groups (P>0.05). The success rate of initial closed reduction in ultrasound group was significantly higher than that in fluoroscopy group (P<0.05).Compared with before operation, the postoperative VAS scores of the two groups were significantly decreased (P<0.05), and there was no significant difference in the VAS scores between the two groups at the corresponding time point (P>0.05). There was no significant difference in the time of complete load-bearing activities between the two groups (P>0.05). Compared with 3 months after operation, the DASH score, forearm rotation ROM, elbow flexion ROM and wrist flexion ROM were significantly improved in the two groups at the corresponding time points, and there was no significant difference in the above indexes between the two groups (P>0.05). In terms of imaging, there was no significant difference in fracture reduction quality and fracture healing time between the two groups (P>0.05). Conclusion: The application of color ultrasound in the treatment of children's forearm fracture with manual reduction and elastic intramedullary nail fixation can reduce radiation injury, improve the success rate of initial closed reduction and shorten the operation time.