Knock to the knee, depending on the degree of severity, the treatment methods taken are different. First, mild bruises: only local soft tissue edema, pain or skin breakdown, can be treated conservatively, such as local cold compresses, topical analgesic drugs, such as Fotarine, analgesic tincture. If there is skin damage, you also need to disinfect, bandage, short-term braking and rest of the knee, that can be quickly recovered. Second, severe knockout injury: If the knockout injury is serious and leads to patellar fracture, it is necessary to take X-ray film to determine the diagnosis and choose conservative treatment or surgery according to the auxiliary examination results. Most people choose surgery, which can restore the flatness of the joint surface as well as the alignment and alignment of the fracture, and can preserve the normal function of the knee joint as much as possible. Patients need postoperative rehabilitation to enhance joint stability and promote smooth healing of the fracture.