How does synovial fluid help nourish articular cartilage?

Articular cartilage lacks a direct blood supply, making it dependent on synovial fluid for its nourishment. This fluid, which is secreted by the synovial membrane, acts as a vital medium for transporting essential nutrients to the cartilage cells, known as chondrocytes.123

The process of nourishment relies on the movement of the joint. As you move, the synovial fluid is distributed across the surface of the articulating cartilage. This movement is crucial, as it ensures that nutrients—such as sulfur, which is necessary for the formation of chondroitin sulfate—are effectively transferred from the blood to the synovial fluid and subsequently to the chondrocytes.1

Because this indirect nourishment system is essential for maintaining healthy joint tissue, regular physical activity is vital to ensure the proper circulation and distribution of synovial fluid throughout the joint cavity.1