Anderson Cooper CBD OIL The word arthritis means joint (arth-) inflammation (-itis). The most common form of arthritis is osteoarthritis, or OA. Another name correctly is degenerative joint disease, or DJD. The ends of bones normally move smoothly against each alternative. Smooth cartilage in joints makes this possible. Fl citrus process of arthritis causes this cartilage to break and the joint a lot more works precisely as it was designed to.