Abstract: Objective To study the efficacy of minimally invasive closed fixation and traditional open internal fixation intraarticular calcaneal fractures. A new reference standard for determining the reduction of calcaneal fractures is proposed.
Methods Retrospective analysis of 58 cases of Sanders Ⅱ calcaneal fractures admitted to our hospital, and they randomly divided into 29 cases in the control group and 29 cases in the observation group. The control group was the traditional lateral Ⅰ-incision reduction and internal fixation of the calcaneus. The observation group was closed reset internal fixation with minimally invasive percutaneous priming. Surgical time, intraoperative bleeding, hospital expenses, incision complications, Bhler and Gissane angles, tibia and arc, fixed operation time in secondary extraction, etc were compared.
Results The observation group was superior to the control group in the time of operation, the amount of bleeding during surgery, the complication of incision, the cost of hospitalization, the fixed time of surgery, the amount of bleeding during surgery, and the cost of hospitalization(P＜0.05). With a well-reduced calcaneal fracture, the connection between the highest point of the posterior edge of the tibia, the highest point of the posterior edge of the talus, and the highest point of the posterior edge of the calcaneus was a smooth arc, and the curvature of the arc tangent to the highest point of the posterior edge of the talus is roughly the same as that of the healthy side.
Conclusion The efficacy of minimally invasive closed fixation and traditional open internal fixation in the treatment of calcaneal fractures is true.  However, minimally invasive closed internal fixation can greatly reduce surgical time, intraoperative hemorrhage, incision complications, hospitalization costs, and secondary extraction internal fixation time, intraoperative hemorrhage, and hospitalization costs. It is worth clinical application. The tibial distance and arc lines have reference value to the reduction of calcaneal fractures.

Key words: fractures, calcaneus, surgical procedures, minimally invasive