1, walking inside the eight and the knee joint, calf has nothing to do with: mostly for the proximal femur anterior inclination angle is too large, the thigh outward rotation is too large, when walking, the hip joint needs to adapt and internal rotation. 2, the figure of eight is mostly caused by bad sitting posture: like kneeling, buttocks sitting on the calf, showing the “W” shape, coupled with ligament relaxation. 3, correct the bad sitting posture: do not kneel, sit cross-legged instead, parents are instructed to correct in a timely manner, there will be a gradual improvement, but it takes time. 4.For small children: the anterior femoral tilt has a strong shaping ability, as long as timely correction of poor sitting posture, most can gradually improve.