Tibial fracture displacement refers to the displacement of the tibial fracture, and pes planus refers to the dorsiflexion of the ankle joint. It is possible for a displaced tibial fracture to affect the dorsiflexion of the ankle joint, and the extent of the effect depends on the extent of the fracture displacement, with the more pronounced the displacement, the greater the effect. The main structures of the ankle joint are the articular surface of the lower end of the tibiofibula and the talus slide. When a tibia fracture is displaced by force, it needs to be fixed by manipulation or internal fixation with a plate. Because the normal structure of the ankle joint is disrupted after the tibia fracture is displaced, if the fracture is not repositioned or displaced after fixation, the angle of flexion and extension may become smaller when performing flexion and extension activities, or symptoms such as ankle pain may occur. The degree of impact depends on the degree of displacement of the fracture, if the displacement is not obvious, the flexion and extension of the ankle joint may not be affected, if the displacement is obvious, the flexion and extension of the ankle joint will be obviously hindered. If the tibia fracture is displaced, it is recommended to consult a doctor in time and take into account your own situation.