The X-ray on the left shows a normal hand. The X-ray on the right shows a hand with advanced rheumatoid arthritis. "Bone erosion" means cartilage and bone are worn away. This X-ray shows how bone erosion and bone displacement can change the shape of the hand. These images are a random sampling from a Bing search on the term "Hand XRay in Osteoarthritis." Click on the image (or right click) to open the source.