The Cause of Knee Pain: Step-By-Step

Step 2 of 5 - Synovial Fluid (Normal Knee Joint)

Cut-section view of normal knee joint

Photo © ADAM

The normal knee joint is surrounded by a membrane (the synovium) which produces a small amount of thick fluid (synovial fluid). The synovial fluid helps to nourish the cartilage and keep it slippery. The synovium also has a tough outer layer (the joint capsule) which protects and supports the joint.

Index: The Cause of Knee Pain: Step-By-Step

1. Step 1 of 5 - Normal Joint (Knee)
2. Step 2 of 5 - Synovial Fluid (Normal Knee Joint)
3. Step 3 of 5 - Inflamed Synovium (Rheumatoid Arthritis)
4. Step 4 of 5 - Joint Damage (Osteoarthritis of Knee)
5. Step 5 of 5 - Where Exactly Does It Hurt?