O-shaped legs, also known as knee varus, is a kind of knee joint angulation deformity, the baby's two ankle joints together, and the knee joints are not together and show the appearance of the letter O-shape, it is not caused by diapers, but by the innate development of the baby's lower limb line.
The line of force is the angle of the lower limbs. As babies grow from birth to adulthood, their lower limb perspectives are constantly changing.
At birth
Normal lines of force are varus, usually increasing as children begin to stand and walk, and may be greater in children who begin to walk at a younger age. In fact, this is a normal physiological phenomenon, because babies at this age have loose ligaments in the lower limbs, and the tibia is mostly in a state of internal curvature.
Age in months
With age, the lower limbs gradually straighten, and the line of force is in a neutral position;
After the age of the month
The line of force gradually changes to valgus, and when the two knee joints are just brought together while the child is standing, the ankle joints are separated and cannot be brought together, and appear to be X-shaped, until the degree of valgus reaches its maximum at the age of 4 years
years later
The degree of valgus force gradually decreases, and it becomes a **physiological curve with slight valgus to neutral position;
years old
Children have usually reached the adult lower extremity line of alignment with only a slight valgus.
Most of the baby's O-shaped legs and X-shaped legs are normal stages of growth and development, which belong to physiological curvature, and parents do not need to worry too much