O-shaped legs will affect the appearance of the legs, low self-esteem, uneven stress on the joints of the lower limbs and cause osteoarthritis. 1. Affecting the appearance of the legs: If the patient has O-shaped legs, it will affect the aesthetic appearance of the legs, the legs will be bent, and the legs will flare outward when walking. 2. Inferiority complex: O-shaped legs will give people an inferiority complex due to the deformity of the legs; due to the deformity of the legs, the patient will have difficulty in walking, which will also affect his/her life in the later stage. 3. Uneven stress on joints of lower limbs: After the occurrence of O-shaped legs, the line of force of lower limbs will change, which will lead to uneven stress on joints of lower limbs. 4. Osteoarthritis: O-shaped legs will lead to knee joint inversion, increase the weight-bearing capacity of the knee joint, cause knee joint pain, to a certain extent, affect the joint activities, leading to osteoarthritis. Therefore, patients with O-shaped legs, must actively seek medical treatment to restore the appearance of the legs, to avoid later damage to the joints, affecting the later joint function.