About the Knee
Knee is the largest joint in your body. It is a complex joint made of bone, cartilage and ligaments. The cartilage in the knee acts as a cushion and gliding surface. When healthy, the cartilage keeps the bones in the joint from rubbing together. However, when the joint is affected by arthritis, the bones make contact and cause pain. Injuries, aging and degenerative conditions such as arthritis can cause the cartilage to break down
Common Causes of Knee Pain
Osteoarthritis: Arthritis is a chronic condition that causes joint inflammation. Symptoms include redness, warmth, swelling, tenderness and pain.
Up to 40 percent of the population may have knee osteoarthritis, or “wear and tear” arthritis. This is the gradual breakdown of the cartilage in the knee. Also called degenerative joint disease, osteoarthritis usually develops over years and often is found in patients who have had a knee infection or injury and those who are overweight/
As cartilage wears away, the bones around it can grow thicker and develop bony spurs. This can lead to increased friction between the bones and disrupted movement in your knee. This also can lead to problems with the synovium, a membrane in your knee that produces a liquid to keep your cartilage slippery. This membrane can become inflamed and make too much fluid. This results in swelling, or “water on the knee.” In the most severe cases, the knee can become deformed as the continued friction wears away the bone. Common symptoms of osteoarthritis include pain, stiffness, tenderness, a limited range of motion and a grating sensation when you bend your knee. The pain is usually worse after activity.
Rheumatoid arthritis: Rheumatoid arthritis can affect joints on both sides of the body (both knees, both hands and/or both wrists). In rheumatoid arthritis, your body’s cells attack your own tissues. Rheumatoid arthritis affects three to five times more women than men and often presents between the ages of 20 and 50.
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