The treatments for left suprapatellar bursa effusion mainly include general treatment, physical therapy, medication and surgery. 1. General treatment: If the amount of effusion is not much and the clinical symptoms are not obvious, rest and avoiding heavy labor in daily life can reduce the wear and tear of the knee joint, thus reducing the production of effusion. 2. Physiotherapy: If the amount of effusion is large, local hot compresses and red light irradiation can be used to promote blood circulation in the knee joint and accelerate the absorption of suprapatellar bursa effusion. 3. Drug therapy: If the suprapatellar bursa effusion is accompanied by pain, some non-steroidal anti-inflammatory drugs (such as diclofenac sodium) can be taken as prescribed by the doctor, and anti-rheumatic drugs (such as nimesulide and methotrexate) can be taken if accompanied by rheumatoid arthritis. 4. Surgery: If the amount of fluid is large, the joint fluid can be withdrawn first, and hormonal drugs (e.g. Triamcinolone acetonide) can be injected into the joint, which can rapidly reduce the symptoms. If the symptoms cannot be relieved, arthroscopic minimally invasive surgery can be considered to drain the fluid and remove the inflamed synovium. When left suprapatellar bursa effusion occurs, it is recommended that standardized treatment be carried out under the guidance of a doctor to avoid delay. In addition, the above drugs should also be used under the guidance of a doctor.