Common treatments for synovitis after knee replacement include general treatment, medication and physical therapy. 1. General treatment: pay attention to rest, reduce the activities of the knee joint, pay attention to the warmth of the knee joint and avoid trauma. 2. Medication: For severe pain, oral non-steroidal anti-inflammatory drugs, such as etoricoxib, can be used to control inflammation; or topical anti-inflammatory and analgesic drugs, such as diclofenac ethylenediamine latex, etc., which can alleviate joint pain. 2. Physiotherapy: Physiotherapy such as hot compresses and baking electricity can penetrate the skin, increase local blood circulation and blood flow, which can help the synovial inflammation in the damaged area to subside, relieve swelling and reduce pain. If the diagnosis of synovitis after knee replacement is confirmed, you should follow the doctor’s instructions for standardized treatment in order to avoid delaying the condition. All of the above medications should be used under the guidance of a doctor, do not use your own medication.