O-leg is also known as knee inversion. There is no so-called fastest way to straighten male knee inversion, which can be changed through brace correction, insole correction, surgical correction and other methods. 1. Brace correction: If the male patient is younger and the degree of knee entropion is milder, the male patient can use the brace to help the knee joint restore the normal anatomical structure, but the treatment time of this program is relatively long, and need to be insisted on for a long time. 2. Shoe inserts: Patients can also develop shoe inserts according to their own situation. The shoe inserts will give support to the leg, which will help to improve the patient’s knee inversion. 3. Surgical correction: If the male patient is older or the degree of knee inversion is more serious, through other ways of treatment is ineffective, you can choose surgical treatment, commonly used to surgical treatment modalities such as osteotomy orthopedic surgery, semi-epiphyseal plate blocking guided growth and so on. Boys who have obvious knee inversion, it is recommended to consult a doctor in time for examination, the doctor will choose the appropriate treatment according to the patient’s condition, do not blindly deal with, so as not to delay the condition.