Joint effusion a resultant large effusion due to inflammation. Gout is usually present with recurrent attacks of acute inflammatory arthritis (red, tender, hot, swollen joint). It is caused by elevated levels of uric acid in the blood that crystallizes and deposits in joints, tendons, and surrounding tissues. Gout affects 1% of individuals in Western populations at some point in their lives. Trauma from ligamentous, osseous or meniscal injuries can result in an effusion. These are often hemarthrosis or bloody effusions. Rest Joint effusion A joint effusion is the presence of increased intra-articular fluid. It may affect any joint. Commonly it involves the
Reactive arthritis trachomatis" is the most common cause of reactive arthritis following urethritis. "Ureaplasma" and "mycoplasma" are rare causes. There is some circumstantial evidence for other organisms causing the disease, but the details are unclear. Reactive arthritis usually manifests about 1–3 weeks after a known infection. The mechanism of interaction between the infecting organism and the host is unknown. Synovial fluid cultures are negative, suggesting that reactive arthritis is caused either by an autoimmune response involving cross-reactivity of bacterial antigens with joint tissues or by bacterial antigens that have somehow become deposited in the joints. There are few clinical symptoms, but the