O-shaped legs at age 50 can be treated with surgical osteotomy correction. At 50 years of age, non-surgical treatments such as braces or external fixation brackets are generally ineffective because the bone structure is already set. Surgical osteotomy is the most common treatment option, but is not applicable to all O-legs. Surgical osteotomies include open or closed linear osteotomies, wedge-shaped osteotomies, etc. Generally, according to the degree of inversion of femur and tibia, linear or wedge-shaped osteotomies are performed to maximize the restoration of normal lower limb force line. Some fixation measures, such as external fixation with braces and internal fixation with steel plates, are also needed to stabilize the lower limb after osteotomy. The most common treatment option for adults with O-shaped legs is surgical osteotomy and orthopedic surgery, but it is mainly used for those with osteoarthritis or those with obvious discomfort symptoms. Mild, asymptomatic O-shaped legs should be treated with conservative measures. Correction of O-shaped legs at the age of 50 can be done by actively visiting a hospital and being treated under the guidance of a specialist.