Plain radiograph of metatarsophalangeal joint space narrowing and erosions in rheumatoid arthritis

The radiograph of the left foot in the AP projection demonstrates an erosion in the periarticular, marginal "bare" area of the joint of the 5th MTP joint and more subtle erosions at the 1st, 2nd, 3rd, and 4th MTPs (arrows), characteristic of rheumatoid arthritis. Also present is joint space narrowing of the 1st and 2nd MTP joints (arrowheads).