After the foot fracture, the calf becomes thinner for the following reasons: first, the most common clinical is disuse muscle atrophy, after the fracture, the patient is fixed with a splint or cast for a long time, bed rest, weight-bearing activities are reduced, and the metabolism is slowed down. According to the principle of use in and out, disuse muscle atrophy occurs in the calf muscles, the most common of which is the atrophy of the triceps muscle, so the calf becomes thinner. With the healing of the fracture, walking on the ground with weight and strengthening functional exercise, the calf will slowly return to its normal thickness. Second, a small number of patients can also be seen in the nerve injury, such as after the fracture combined with nerve injury, the patient will also appear to lose nerve muscle atrophy and calf thinning, electromyography can be a clear diagnosis, if the nerve injury, the need for nerve repair surgery.