The bursa of the knee can be divided into the suprapatellar bursa and the prepatellar bursa, the prepatellar bursa is the bursa below the knee ligament, when it appears inflammation can appear the following symptoms: 1, pain, pain can be more obvious when the joint is flexed. 2, can appear local cystic mass, in the body surface can be felt in the bursitis fluid formation of the mass. 3, joint movement is limited, due to pain and bursitis mass formation, and joint movement is limited. The joint movement is limited due to pain and the formation of bursitis masses. The suprapatellar bursa of the knee is the largest bursa in the body, and its inflammation can cause the following symptoms: 1. pain in the joint, which is more pronounced when the joint is flexed and extended and when walking long distances. 2. swelling of the joint, as there can be a large amount of fluid in the bursitis, there can be significant swelling in the knee joint, and there can be soft fluid flow, which can be further diagnosed and treated with an MRI.