Swelling of the upper knee, if not acute trauma, is usually a reaction to inflammation of the synovial membrane of the suprapatellar capsule of the knee caused by synovitis. The following treatments are available: 1. Physical therapy. Microwave physiotherapy or far-infrared physiotherapy can be used to help eliminate the inflammation of the suprapatellar capsule synovitis of the knee. 2. Oral medication. You can take oral anti-inflammatory and pain-relieving drugs such as meloxicam, celecoxib, loxoprofen sodium tablets, and you can also take oral Chinese medicines such as synovitis tablets for synovitis treatment. If none of these treatments work, an MRI should be performed to see if there is a tumor in the synovial membrane or soft tissues of the knee joint, and if surgery is needed.