After ankle fracture surgery, if the ankle joint must be fixed with a brace or cast, the ankle joint is temporarily immobilized, but it is important to move the joints of other lower limbs, such as the hip, knee, and the joints of the toes, to prevent stiffness of the joints. It is also important to do more static contractions of the muscles of the lower extremities, such as static isometric contractions of the quadriceps and biceps of the thigh. It is also important to do more dorsiflexion and flexion of the toes to promote contraction of the calf muscles and prevent muscle wasting atrophy. You can do straight leg raise training of the lower limb, straighten the knee joint of the lower limb, lift it off the bed, hold the lower limb at an angle of about 45 degrees, wait for the muscles of the thigh to contract with force, and then put it down slowly when there is obvious weakness and soreness of the lower limb, rest and do the movement a second time, which can better exercise the muscles of the thigh. When the external fixation of the ankle joint is removed, it is necessary to start the exercise of flexion and dorsiflexion of the ankle joint, and it is also important to pay attention to the joint exercise of external and internal rotation.