This knee joint is usually surrounded by way of a supplement. This specific supplement varieties your "joint room. " This joint room normally possesses handful of lubricating water (called synovial fluid) in the knee to keep your knee shifting quickly. A few problems lead to an accumulation of the water. Its this that many people think about a inflamed knee, also called a new knee effusion. There are few causes for the knee joint the are blood in the knee and knee arthritis.