This is a common deformity of the knee joint in the elderly. According to statistics, 1/4 to 1/5 of the elderly over 60 years old may have O-shaped legs.
This is because the cartilage in the knee joint of the elderly is worn out, and if they go to x-ray, their joint space becomes smaller, and the joint seam becomes smaller on the x-ray. We can see that the knee joint gap is smaller than normal, and the joint surface is no longer parallel to the ground, so he has an O-shaped leg. The main discomfort of an elderly person with O-leg is that the joint will be painful and weak, especially when doing squatting movements such as squatting on a toilet, sitting on a sofa or a small stool, and when he sits for a while and stands up, he will also feel very hard. A small number of people even need surgery, and need to be seen by a professional joint surgeon.