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.
No: The joint should not have any appreciable fluid in it normally. Fluid can be there from many reasons. Arthritis can cause fluid. Also surgery can cause some bleeding in the knee which can cause the fluid to build up. The fluid makes the joint stiff and makes it hard to get a good quad function. ...Read more.
The buildup can be seen and felt at the top of the kneecap. It is not something you would see under the knee. An injury such as a contusion (soft tissue bruise) to the kneecap may also cause localized swelling. In some cases, the buildup of blood and fluid may mimic an acute injury of the knee joint. Source: Gupte, C. and St. Mart, J. The acute swollen knee: diagnosis and management..