Collagen is a natural protein component of the skin that acts like a scaffold and the main building block for cells, tissues and organs. About a third of the protein content in your body is made up of collagen, which is found in the bones, muscles, and tissues of the organs.
1 There can be the accumulation of fluid on the knee after an accident. 2  In most cases, the fluid is blood which can be through a fracture caused to the knee. 3  The swelling of the knee often takes place within some minutes of the injury occurring. 4  Gout and pseudo-gout can also cause fluid on the knee.
Causes of Fluid on the Knee. There can be the accumulation of fluid on the knee through rheumatoid arthritis or osteoarthritis. There can be extra production of synovial fluid in the knee through arthritis. Infection in the knee joint; the fluid on the knee is pus, and not synovial fluid. There can be the accumulation of fluid on the knee after an accident. In most cases, the fluid is blood which can be through a fracture caused to the knee. The swelling of the knee often takes place within some minutes of the injury occurring. Gout and pseudo-gout can also cause fluid on the knee.