Effect of postoperative fracture gap on bone union in femoral diaphyseal fractures treated with intramedullary nailing: a retrospective clinical study

Our study results showed that the rate of open reduction was higher in patients with nonunion and those with open fractures and those undergoing open reduction had longer healing times. We also observed a positive correlation between translation values in the anteroposterior and lateral planes and healing time, with increased translation leading to longer healing durations. These findings indicate that open reduction and increased fracture translation, particularly in the anteroposterior plane, are significant factors influencing delayed union and nonunion in femoral shaft fractures treated with IMN.