Malunion in old fractures is mild and does not require treatment, but if the malunion is severe, surgical treatment is required. The deformity healing of old fracture needs to be treated with appropriate measures according to the degree of deformity healing of the fracture. If the patient’s fracture deformity is mild and has no effect on function, it can be left untreated. If the fracture deformity is obvious and affects the function of the limb, the deformity needs to be corrected by osteotomy and external fixation brace surgery. If the patient develops a joint deformity, treatment with osteotomy may be necessary. It is recommended that patients with old fractures with deformed healing need to see a doctor to check the healing of the fracture. The doctor will take appropriate measures according to the patient’s condition. After surgery, patients should ensure adequate rest, avoid overwork, and should not put the affected limb under weight too early. For patients with primary diseases such as malnutrition or diabetes, they need to be treated for the primary disease. Patients should go to the hospital for regular checkups after surgery and avoid strenuous exercise.