Excess meniscal fluid, also known as knee effusion, is mostly directly related to inflammation of the synovial bursa, which is directly related to inflammatory synovial exudate caused by trauma, excessive exercise, or bacterial or viral infection due to localized lesions. Increased inflammatory bursal exudate often leads to increased fluid accumulation in the knee cavity, swelling of the knee joint and, in severe cases, a positive floating patella test. If there is excessive fluid in the knee joint cavity, it can also be seen during some traumatic injuries, which often lead to bloody exudation from the knee joint cavity and inflammatory exudation from the synovial membrane, usually with bloody exudation. In this case, if the swelling of the knee joint is obvious and there is a positive floating patella test, you can consider extracting part of the fluid. In addition, it is important to be less active during this period to avoid excessive inflammatory exudation.