The suprapatellar bursa is the largest bursa in the human body and is often affected by cold, strain or due to arthritis, and a series of symptoms occur secondary to bursitis, including the following. First, pain, suprapatellar bursitis is very obvious when the joint is moving, often above the patella, but can also involve both sides of the patella or the back side of the knee. Second, swelling, suprapatellar bursitis is often accompanied by a large amount of exudate or fluid in the joint cavity, which results in significant swelling of the knee joint, which can be palpated by hand. Third, limited joint movement, due to joint pain and the formation of a large amount of fluid, there will be a significant restriction of knee movement, suprapatellar bursitis with a large amount of fluid, often requires joint braking and joint cavity puncture to extract the fluid for treatment.