X-ray - hands

Role

Hand X-ray is central to diagnosing and staging inflammatory and degenerative arthritis, given the hands' frequent early involvement and the distinct, disease-specific radiographic patterns seen at this site
Among the most frequently ordered rheumatological X-rays, given the hand's role as both an early-affected site in RA and a common site for osteoarthritis

Rheumatoid arthritis: symmetric, predominantly MCP and PIP joint involvement, with periarticular osteopenia, marginal erosions (bare-area erosions at the joint margin, outside the protective cartilage), and joint space narrowing - DIP joints are classically spared
Osteoarthritis: predominantly DIP and thumb base (first CMC) joint involvement, with osteophytes, joint space narrowing, and subchondral sclerosis - no significant erosion or periarticular osteopenia
Psoriatic arthritis: can affect DIP joints (unlike RA), with a mix of erosive and proliferative new bone formation, and the classic (though not universal) "pencil-in-cup" deformity in advanced disease

The pattern of joint involvement (which joints) combined with the specific radiographic features (erosive vs proliferative, symmetric vs asymmetric) usually distinguishes RA, osteoarthritis, and psoriatic arthritis without needing further imaging
Serial hand X-rays are used to monitor structural progression (new erosions, joint space narrowing) in known inflammatory arthritis over time, complementing clinical/laboratory disease activity assessment

Radiographic progression despite apparently controlled clinical disease activity should prompt treatment reassessment - structural damage can progress even with modest ongoing subclinical inflammation not fully captured by clinical assessment alone

Rheumatoid arthritis, osteoarthritis (particularly thumb base), psoriatic arthritis, gout (chronic tophaceous changes)

DIP joint involvement is a key discriminator: spared in RA, affected in osteoarthritis and psoriatic arthritis - a simple, high-yield pattern recognition point for distinguishing the major inflammatory and degenerative hand arthropathies

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