It may be because the knees of both legs are contracted inward, which leads to the outward bending of the calves. This way of walking can easily lead to joint sprain and injury, and long-term uneven stress will lead to the wear of cartilage outside the knee joint, leading to arthritis. It will also put pressure on the hip bone, leading to bone pain when sitting for a long time, forming a commonly known X-shaped leg. You can simply do an experiment and kneel down. If you can't squat, you should pay great attention.
Second, the inner wear of the sole: knee pain, accelerating degradation.
It may be that the knees of the two legs are separated outward, resulting in the calf and tibia turning inward at a certain angle. If it is serious, it will form an O-leg or an "inside picture". If you walk in a figure of eight, it means that the toe angle is too large, and after a long time, your knees will move outward and your legs will be deformed. With the increase of age, it can lead to knee joint pain and accelerate joint degeneration, and even cause lumbar discomfort.
Third, the wear of both feet and soles is asymmetric: the length of legs is different.
This situation is mostly caused by uneven stress on the knee. The most typical symptom is different leg lengths. When a person's foot is injured, he will deliberately avoid exerting force on the injured side, which will form a protective claudication, and may also cause uneven exertion on both legs, resulting in obviously different wear on the soles of both feet.
Some people worry that the injured part will be pulled again when walking after sports injury, so dragging the legs will also cause lumbar deformation.
Fourth, the forefoot sole wear: the healthiest and most standardized posture. The front of the shoes is badly worn, which is the most beautiful walking posture and the healthiest walking way. Gymnasts don't walk with their feet on the ground, but run with their front paws on the ground first. This is because the sole has good elasticity and the impact of the sole landing on the human body is small.
Therefore, whether running or walking, it is recommended that the forefoot land to cushion the impact of the human body, which is good for protecting joints.