Hand X-Ray for Suspected OA or RA
A posteroanterior (PA) radiograph of both hands on a single film/field of view is adequate for diagnosis of both osteoarthritis and rheumatoid arthritis 1.
Recommended X-Ray Series
For Suspected Hand Osteoarthritis
- Single PA view of both hands is sufficient for diagnosis 1
- This captures all relevant joints: DIPs, PIPs, thumb base (CMC-1), and index/middle MCPs
- Look for: joint space narrowing, osteophytes, subchondral sclerosis, subchondral cysts
- In erosive OA: subchondral erosions at IP joints 1
For Suspected Rheumatoid Arthritis
- PA view of both hands and wrists is the standard initial imaging 2, 3
- Additional views may improve erosion detection if initial films are negative 4
- The Nørgaard view (hands halfway supinated) has been studied but offers limited additional value—erosions visible on this view are usually also seen on standard PA films 5
- Focus on: MCPs, PIPs, and wrists (RA typically spares DIPs)
- Look for: marginal erosions, periarticular osteopenia, symmetric joint space narrowing
Key Differentiating Features
Joint distribution patterns are critical:
- OA targets: DIPs, PIPs, thumb base, index/middle MCPs 1
- RA targets: MCPs, PIPs, wrists (typically spares DIPs) 1
Erosion characteristics differ:
Clinical Context Matters
The EULAR guidelines emphasize that imaging findings must be interpreted alongside clinical features 1. A single radiographic feature has limited diagnostic value—composite assessment is essential 1.
For OA: Consider age >40, female sex, Heberden/Bouchard nodes, bony (not soft tissue) swelling, and usage-related pain 1
For RA: Consider younger age, morning stiffness >30 minutes, soft tissue swelling, symmetric involvement, and elevated inflammatory markers 1, 2
When Initial Films Are Negative
If clinical suspicion remains high despite negative radiographs:
- For OA: Further imaging is seldom indicated for diagnosis 1
- For RA: Consider MRI or ultrasound to detect earlier erosions and synovitis if therapeutic decisions depend on it 2, 4
Common Pitfall
Do not order multiple specialized views routinely. The standard PA view of both hands captures the diagnostic information needed in >90% of cases 1, 2. Additional views add cost and radiation without substantially improving diagnostic accuracy for typical presentations 5.