Children with protruding bones on the inner side of the knee are considered to be suffering from bony prominence or knee valgus, it is recommended to go to the hospital for a detailed examination in a timely manner, and then treat according to the doctor’s guidance and recommendations. 1. Bony prominence: On the inner side of the patella of the knee joint, there are bony prominences such as the medial femoral condyle. Some children may have a more pronounced protrusion due to genetic factors. Or due to the body is relatively thin and weak, may also lead to bony protrusion become more obvious. It is a normal physiological phenomenon and generally does not require special treatment. 2. Knee valgus: children have knee valgus. Generally due to the presence of genetic factors, or the presence of malnutrition, resulting in knee valgus. At this time there will be here very obvious bony protrusion, generally with the later development, or correct walking posture, can be restored to normal. Usually pay more attention to cultivate children’s normal walking posture, to avoid causing some leg deformities.