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.
Fluid, or water, on the knee is also called knee effusion. Joints naturally contain some fluid to help lubricate and cushion the joint while you move. However, certain conditions can lead to an excess buildup of fluid. When this happens, the knee can swell, become painful and stiff, or there can be skin discoloration and bruising. See your doctor for an accurate diagnosis if you experience these symptoms. Your doctor may order x-rays, blood tests and aspirate some of the fluid to determine the cause of fluid on your knee. Injuries