Osteosynthesis is an ancient Chinese medical term for a so-called toxic gas that collects in the bones and breaks out, equivalent to the modern medical names of acute osteomyelitis and chronic osteomyelitis, which is a bacterial infection of the bones. It is most common in adolescents and even in children, mainly in the thigh or calf bones near the joints, and is mainly caused by open fractures or infections in other parts of the body that spread to the bones through the blood. The disease should be treated with a large amount of antibiotics and surgical debridement should be considered according to the specific characteristics of the infection, which is very troublesome and has a long treatment period.