Knee OA Progression

In the healthy knee joint, a smooth, cushiony substance called cartilage covers the ends of the bones and protects them from rubbing against each other. There is a space between the ends of the bones that holds a fluid called synovial fluid. Synovial fluid surrounds, lubricates, and protects the joint.

In the early stages of osteoarthritis (OA) of the knee, tiny cracks and pits may begin to form in the cartilage as its surface begins to break down.

Over time, large sections of cartilage may lose flexibility and begin to wear down. Cartilage in poor condition is more likely to be damaged by daily wear and tear or injury. Bone spurs may form on the edges of the bones. At the same time, the synovial fluid begins to break down, losing its ability to cushion and lubricate the joint.

Eventually, sections of cartilage may completely wear away, leaving the ends of the bones unprotected, rubbing painfully against each other. Also, tiny pieces of cartilage or bone may float in the joint space, causing further damage and pain.

There is good news. OA of the knee is manageable, especially if detected in the early stages of the disease. That’s why it’s important to contact your doctor if you have pain or stiffness in your knee. Only your doctor can diagnose OA of the knee, and together you and your doctor can choose a treatment that’s right for you.