O-shaped legs are medically called knee varus, commonly known as ‘loop legsRefers to the knee joint, the tibia of the calf has rotated inward an angle, so it is called ‘knee varus.’ O-legs can already be corrected by biomechanics. You only need to wear professional children’s corrective shoes. Pay attention to the running posture, walking posture and auxiliary exercises provided by professionals, which can help children recover well.