A small amount of fluid in the knee joint bilaterally does not usually affect walking, but if a larger amount of fluid results in swelling of the affected limb, walking may be affected. Knee joint effusion refers to the abnormal accumulation of synovial fluid in the knee joint. If the patient only has a small amount of effusion, it usually does not affect normal walking. However, as the disease progresses, if the amount of fluid in the knee joint continues to increase and accumulate, it may lead to swelling of the affected limb, resulting in reduced mobility and affecting walking, or even leading to complete immobilization of the joint. If the patient experiences obvious symptoms of pain, he or she can take oral non-steroidal anti-inflammatory drugs such as ibuprofen and aspirin as prescribed by the doctor, or local injections of glucocorticoid drugs such as hydrocortisone injection and methylprednisolone. Meanwhile, with the joint puncture fluid, heat, ice and other therapeutic measures to reduce swelling, relieve pain symptoms and improve the prognosis. Patients with a small amount of fluid on both sides of the knee joint are recommended to go to a regular hospital and take relevant treatment measures under the guidance of a doctor. In daily life, it is necessary to ensure sufficient rest time and avoid strenuous exercise.