Diagnostic criteria = 4 of 7 of
2. Morning stiffness (>1 hour lasting 6 weeks)
3. Involvement of joints of hand (wrist, MCP, DIP) and feet (MTP) - Boutonniere and swan neck deformities of fingers at PIP and DIP, z-deformity of thumb, ulnar deviation of fingers at MCP, dorsal wrist subluxation.
4. Characteristic radiological findings (Joint space narrowing, juxta-articular osteopenia, soft tissue swelling)
5. Rheumatoid nodules
6. Rheumatoid factor +ve
7. Extra-articular manifestations