The difference between inversion and hallux valgus is mainly a change in the horizontal position; the other is a lesion in the lost position. When inversion of the foot occurs, it means that there is an imbalance in the strength of the muscles and tendons on the inside and outside, and that the muscles on the inside are stronger or the tendons are contracted due to some pathology, which triggers the foot to turn over horizontally, and the position of the inside is higher than the outside, so inversion of the foot is formed. The inversion of the foot is not a change in horizontal position, but a change in sagittal position. The distal end of the limb is where the toes move medially, and the proximal heel does not change, so inversion of the foot is formed.