If the knee is swollen and painful due to trauma, it is important to strictly brake the affected limb to minimize the swelling of the patient, which can reduce the hemorrhagic exudation from the knee after trauma. In addition, during the acute phase, which is within 3 days, cold compresses can be applied to reduce the local hemorrhagic exudation and reduce the swelling. After the acute period, you can apply hot compresses appropriately, or take oral medications to promote swelling, such as Diosmin, Mai Zhi Ling, and Cao Xiu Xie, which are commonly used in clinical practice and have very good effects on swelling and dehydration. If there is localized swelling and pain, it can also be treated with appropriate Chinese medicines, such as Panax notoginseng tablets and Tiong Pao Pills. If the swelling of the knee joint caused by this trauma is particularly obvious, it indicates that there is a lot of blood exudation inside, and if there is an obvious positive floating patella test, a sterile puncture can be considered to extract part of the fluid, because this fluid is absorbed within the knee joint by itself very slowly.