There is an essential element in the synovial fluid a substance called sodium hyaluronate. This substance lets the synovial fluid perform all its functions at the same time. Normal synovial fluid is transparent, viscous, colorless, or pale straw-colored.

What is Synovial Fluid?

Synovial fluid is a source of nourishment for the avascular articular cartilage and a lubricant for joint surfaces. It helps in joint stability by forming a hydraulic adhesive seal between the two articulating bones. In the knee joint there are 2 bones, the ends of these bones are covered in a very smooth layer of a tough, rubbery substance known as cartilage. The joint is enclosed in a stiff and elastic cover made of a strong, fibrous tissue. The joint cover encloses the space around the joint surfaces and is lined by a synovial membrane. The joint cover contains a thick, slippery liquid called synovial fluid.

Where is the Synovial Fluid Present?

All the joints that allow movement, require lubrication for the joints to function properly. The wrist, jaw, shoulder, hip, fingers, thumb, ankle, elbow and the knee are all joints where synovial fluid is present.

What Does the Synovial Fluid Do?

The synovial fluid mainly has 4 functions to perform in the joint –

  • it lubricates the joint, helping it to work freely and easily,
  • it acts as a filter, letting nutrients reach the cartilage and blocking the passage of harmful cells and substances,
  • it keeps the bones slightly apart, protecting the cartilage coverings from wear and tear,
  • it absorbs shocks, again protecting the cartilage.