Osteoarthritis is the most common form of arthritis. Most people are familiar with rheumatoid arthritis, which is an autoimmune disease. Osteoarthritis is caused by the cartilage in the joints of the knee getting worn down over time or from trauma. The most common symptoms of both types of arthritis are pain, stiffness, swelling, and joints that aren't able to function. Genicular artery embolization (GAE) is a minimally-invasive procedure that can help reduce knee pain in patients with osteoarthritis.