Abstract: Objective    To explore the feasibility and scientificity of the three-step reduction method for treating Sanders type II calcaneal fracture, and to promote the optimization of the treatment plan for calcaneal fracture.    Methods   Using the CT data of healthy adult male ankle joints, normal ankle model and Sanders type II calcaneal fracture model were constructed, and mechanical loading of the three-step reduction method was performed on the fracture model, simulating techniques such as traction, lifting and pressing, and pinching and joining ends. The reduction of the calcaneus before and after reduction was evaluated and the mechanical changes under different techniques were solved.   Results    Normal foot model and Sanders type II A/B/C calcaneal fracture model were established. The calcaneal length, height, width, Gissane’s angle, and Bohler’s angle were significantly corrected after manual loading and reduction. By solving the mechanical trends of different techniques, it was found that traction effectively corrected overlapping displacement, pressing and pushing focused on correcting anterior-posterior displacement, and squeezing the bone ends aimed at correcting medial-lateral displacement.    Conclusions   The three-step reduction method can effectively treat Sanders type II calcaneal fracture by correcting the fracture displacement and restoring the anatomical structure of the calcaneus in sequence, confirming the effectiveness and scientificity of this technique.

Key words: Calcaneal fracture,  ,  , Sanders II,  ,  , Three-step reduction method,  ,  , Finite element analysis,  ,  ,  , Biomechanics