O-leg is medically known as inversion of the knee, commonly known as rotundity; X-leg is medically known as ectropion of the knee.
The harm is mainly in the following two aspects: 1, affect the aesthetics, causing a certain sense of inferiority to people’s psychology, women are ashamed to wear short skirts and tight pants.
2, the knee inversion makes the force line of the lower limb change, the medial space of the knee joint is subjected to greater than normal load pressure, in the long run, causing joint degeneration of the medial space of the knee joint, eventually may develop into osteoarthritis of the knee joint caused by pain, serious cases, the need for artificial joint replacement.
3. Knee valgus causes the force line of the lower limb to change, and the lateral space of the knee joint is subjected to greater than normal load pressure, which in the long run causes joint degeneration of the lateral space of the knee joint.