This document provides information about osteoarthritis, including what it is, common causes and risk factors, symptoms, and treatment options. Some key points: - Osteoarthritis is the most common type of arthritis, caused by breakdown of cartilage in joints. It often affects weight-bearing joints like hips, knees, lower back. - Risk factors include age, being overweight, joint injuries, and certain jobs/sports. Symptoms are joint pain and stiffness. - Cartilage contains collagen, proteoglycans, chondrocytes, and synovial fluid which help absorb shock and reduce friction. In osteoarthritis, cartilage breaks down over time. - Nutritional supplements like glucos