As a parent, have you ever observed your child’s legs and walking gait? After observation, you may find that your child’s legs are not straight and walk with an inward or “8” outward gait, which is often referred to as inversion or valgus. There are many reasons for this, including rickets, calcium deficiency, genetics, early toddler, use of walkers, etc. A few are caused by trauma, inflammation, tumors or congenital epiphyseal dysplasia, which can occur in unilateral or bilateral limbs. Under normal circumstances, when both lower limbs of children 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 two knees are not in contact with each other and there is a distance between them when the knees are together, the knee is ectropion. Knee inversion, also known as “O” shaped leg, is mainly manifested by outward bending of the lower limbs, wide distance between the knees, walking sway, toes to the medial side; lying down, lower limbs straight, patella to the upper, bilateral inner ankles together, there is a distance between the knees, the greater the distance, the heavier the inversion. Knee valgus is also called “X” shaped leg, or “K” shaped leg if it is unilateral, mainly manifesting as awkward walking, when walking, both knees collide with each other, easy to fall down, toes inward; lying down, lower limbs straight, patella to the top, 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. After birth and up to the age of 1 year, normal children have mild inversion of the knee, and by the age of 1.5 years, 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. When the brace is worn, the legs need to be kept in a constant state of tightness and cannot be curled and moved, so the child’s compliance is poor. 3.Orthopedic shoes + orthopedic insoles: 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 to change the negative gravity line when walking, so that the deformity can be gradually corrected. 4.Bone fracture method: Only for children under 5 years old with inversion of the knee, the tibiofibula is broken with force at the most obvious part of the bilateral calf bend, and then fixed with a plaster, usually fixed for 1.5-2 months time to heal. 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.