External fixation and Kirschner wires in the treatment of paediatric displaced supracondylar femur fractures.

Purpose Kirschner-wire fixation (KF) and external fixation (EF) for the treatment of displaced supracondylar femur fractures (SFFs) were demonstrated respectively in previous reports. However, there is no paucity of convincing information on better treatment options for children. The aim of this study was to show results of KF and EF in the treatment of paediatric SFFs according to clinical and radiological outcome. Methods A retrospective analysis including 22 displaced closed SFFs was performed. A total of 12 patients were treated with KF, other ten patients were treated with EF. All patients were followed up for at least 24 months. Demographic data, surgical outcomes and postoperative knee function using the Knee Society Score (KSS) scale were evaluated in this research. Results The patients in the KF group were significantly younger than in the EF group (p < 0.001). The KF group had superiority in operative time (p = 0.001), blood loss (p = 0.027) and length of hospital stay (p = 0.001). Clinical healing outcome did not differ between the two groups. The KF group achieved radiological union in a shorter period (p < 0.001), with a better range of movement (ROM) and KSS postoperative score. Conclusion Both KF and EF can achieve excellent outcomes for paediatric SFFs. KF has many advantages in younger children.