There are 2 treatment options that are usually used after a fall that results in a knee effusion, also known as a joint effusion. The 1st is conservative treatment and the 2nd is surgical treatment. The main treatment option depends on the extent of joint damage after the fall. If the injury is mild and the joint is simply effused, joint motion should be strictly limited for a period of time, preferably with the affected limb braked and elevated. cold compresses should be applied for 48 hours, and hot compresses, microwave physiotherapy, and medications to invigorate blood circulation and remove blood stasis should be applied after 48 hours. If there is a lot of fluid in the joint, a syringe can be used to extract it. If the knee joint injury is more serious and reaches the level of fracture, it is necessary to decide whether to carry out plaster immobilization or surgical treatment according to the degree of fracture.