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.
The excess fluid on the knee can be the result of trauma such as a ligament tear or overuse injuries or the result of underlying conditions you have such as an infection or arthritis. You can get rid of excess fluid on the knee at home and with treatments from your doctor. (Jupiterimages/liquidlibrary/Getty Images).