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.
Best Answer: When excess fluid accumulates either in or around the knee joint, this is called water on the knee. The cause of water on the knee is usually arthritis.When patients have knee arthritis, fluid accumulation within the joint is a common finding.raumatic injuries can also cause accumulation of either fluid or blood within the joint. For example, meniscus tears and ligament injuries can cause fluid to collect. Furthermore, tearing of small blood vessels can cause fluid to accumulate within the knee, this is commonly seen in patients with an ACL tear.