Abstract:

Objective To analyze the clinical value of 3D printing combined with subtalar arthroscopy intreatment of calcaneal fractures. Methods 128 patients with Sanders Ⅱ⁃Ⅳ calcaneal fractures diagnosis in thehospital from January 2019 to August 2020 were chose and randomly divided into the control group and the observa⁃tion group，where 64 patients were respectively included. The control group was treated with subtalar arthroscopicpercutaneous open reduction and internal fixation. The observation group was treated with 3D printed calcanealfracture model and simulated surgery scheme before operation. The two groups were followed up until August 2021，with follow⁃up time of 12~31 months and median time of 25 months. The operation related indexes including time，bleeding volume and complications，postoperative stay⁃in hospital days and fracture healing time，joint functionincluding Böhler angle，Gissane angle and American Orthopaedic Foot and ankle Association（AOFAS）score werecompared between the two groups. Results There were no differences of operative time and bleeding volumebetween the two groups（P > 0.05），while the incidence of complications in observation group was lower than thatin control group（P < 0.05）. The stay⁃in hospital days and fracture healing time in the observation group were shorterthan those in the control group（P < 0.05）. Böhler angle and gissane angle in the two groups increased after treat⁃ment. But those in observation group were significantly higher than control group（P < 0.05）. The excellent andgood rate of foot and ankle function inobservation group was higher than control group（P < 0.05）. Conclusion Preoperative 3D printing combined with subtalar arthroscopic minimally invasive treatment of Sanders Ⅱ-Ⅳ calca⁃neal fractures has good clinical safety and efficacy. It can greatly reduce perioperative complications and shortenfracture healing and rehabilitation time，while improving foot and ankle function.

Key words: 3D printing, subtalar arthroscopy, calcaneal fracture