Under normal circumstances, when both lower extremities are standing straight and the patella is facing forward, the two knees and the two inner ankles (inner ankle bones) should be in contact with each other. If the two knees are not in contact with each other and there is a distance between them when the inner ankles are together, the knee is inversion; if the knees are not in contact with each other and there is a distance between them when the knees are together, the knee is ectropion. The main manifestations are the outward bending of the lower extremities, the wide distance between the knees, the swaying of walking, and the medial deviation of the toes; in the lying position, the lower extremities are straight, the patella is directly above, and when the bilateral inner ankles are together, the distance between the knees exists, and the greater the distance, the heavier the inversion. Knee valgus is also known as “X” shaped leg, or “K” shaped leg if it is unilateral, mainly manifesting as awkward walking, double knees colliding with each other when walking, easy to fall down, toes deviating inward; in lying position, lower limbs straight, patella facing upward, when both knees are together, the distance between the bilateral inner ankles The greater the distance, the heavier the inversion. If your child has the above symptoms, early examination should be conducted to clarify the cause and degree of deformity for early treatment. In normal children, there is a mild inversion of the knee from birth to 1 year of age, and by 1.5 years of age, both lower limbs become straight, which is a physiological inversion of the knee and does not require treatment. This is a physiological knee valgus, and generally does not require treatment. If the knee valgus or knee valgus deformity is still present beyond this range, treatment is required. The upper and lower ends of the affected limbs are fixed, and the deformity is most obvious, with gentle pressure 20-30 times, the pressure should be moderate, avoiding violence, 3-4 times a day, continuously, without interruption. 2, brace treatment: the three-point correction theory of brace is used for treatment, according to the patient’s specific condition custom-made special orthopedic brace, and insist on wearing at night. Note that special brace makers are required, but the quality and effect of the brace varies greatly because of the difference in the level of the maker. And some braces need to be worn with the legs in a constant state of tightness, limiting curl and movement. 3.Orthopedic shoes + orthopedic insoles: Using orthopedic insoles (or with orthopedic shoes), there is a slope difference between the inner and outer side of the sole, so that the force line to the knee joint can be decomposed into inward or outward growth force, in order to change the negative gravity line when walking, so that the deformity can be gradually corrected, applicable to some children with milder conditions. 4.Bone fracture method: Only for children under 5 years old with inversion of the knee, in the most obvious part of the bilateral calf bending, force the tibiofibula to break, and then fixed with a plaster, usually fixed 1.5-2 months time, can be healed. 5.Surgical correction method: Applicable to knee inversion above 4 years old, knee valgus above 8 years old, or patients with heavy internal or external degree, generally using the wedge-shaped osteotomy method of correction, osteotomy site selected in the most obvious part of the deformity.