ObjectiveTo investigate the value of 3D printing technology applied to the treatment of complex Pilon fracture. MethodsClinical data of 30 patients with Pilon fracture were retrospectively analyzed. The preoperative planning using 3D printing and rapid prototyping technology was performed in the 15 cases of the experimental group. Traditional open reduction and internal fixation was performed in the 15 cases of the control group. The related indices were compared between the two groups, including the duration of operation, incident rates of postoperative incision necrosis and infection, Kofoed function score at the last follow-up. ResultsAll of the patients were followed up for 6-15 months (the average was 11 months) after operation. Compared to the control group, the operative duration and intraoperative blood loss were shorter or less in the experimental group（P＜0.05）. There were no significant differences in the duration for fracture healing and postoperative Kofoed score between the two groups（P＞0.05）. At the last follow-up, the good and excellent rate of the experimental group and control group were 100%（15/15）and 86.7%（13/15）respectively. There was no significant difference in the clinical efficacy between the two groups（P＞0.05）. ConclusionBefore operation, Pilon fracture modeling by 3d printing technology can shorten the operative duration, reduce the surgical trauma and provide good conditions for functional rehabilitation.

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