The diagnostic criteria for O-leg are: If there is a distance between the two knees when the heels and palms of the feet are together and the legs are relaxed and upright, it means that there is an O-leg.
The severity of O-leg is generally determined by two indicators: the normal knee distance and the active knee distance.
The normal knee distance refers to the distance between the inner knee joints when the ankles are close together and the legs and knees are relaxed when standing upright.
Active knee distance refers to the distance between the medial side of the knee joints when the ankles are close together and the legs and knee joints are forced inward while standing upright.
According to the size of the normal knee distance and active knee distance, “O-leg” is divided into degree I, degree II, degree III and degree IV.
1, the normal knee distance is below 3 cm, the active knee distance is 0 is degree I; 2, the normal knee distance is below 3 cm, the active knee distance is greater than 0 is degree II; 3, the normal knee distance is between 3-5 cm is degree III; 4, the normal knee distance is greater than 5 cm is degree IV.