A 31-year-old woman complains of pain and swelling in her radiocarpal and metacarpophalangeal joints and morning stiffness for up to 1.5 hours. Two weeks ago she developed pain, swelling, and redness in her knee joints and fever of37.5°C. Examination of her internal organs shows no pathological changes. She was diagnosed with rheumatoid arthritis. What changes will most likely be visible on the X-ray scan of her joints?