What is the main role of synovial fluid?

The main role of synovial fluid is to lubricate joints. Synovial fluid is found in the synovial cavities of the joints and plays a critical role in reducing friction between the articular cartilage of synovial joints during movement. This lubrication ensures that the surfaces of the bones can glide smoothly over each other, which is essential for normal joint function and to prevent wear and tear on the cartilage.

Additionally, synovial fluid acts as a shock absorber, distributing loads across the joint and helping to maintain joint integrity. It also serves as a medium through which nutrients and waste products can be exchanged between the cartilage and the synovial fluid, although its primary function remains lubrication to facilitate smooth movements.