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.
Swollen knee is the accumulation of fluid in and around the knee joint after an injury or in some cases due to an ongoing knee problem. Swollen knee can be caused by: 1  An Accumulation of the Synovial Fluid: This is also called water on the knee or a knee joint effusion. 2  The accumulation of the synovial fluid can come gradually and then go. 3  Arthritis is susceptible of this kind of symptom. 4  Bleeding in The Joints: This is also called hemarthrosis.