Psoriatic Arthritis

Inflammatory articular disease (joint, spine, entheseal) + ≥3 points from: • Current psoriasis (2 points), personal history (1), family history first/second-degree (1). • Typical psoriatic nail dystrophy (pitting, onycholysis, hyperkeratosis) (1). • Negative RF (1). • Dactylitis current or past (1). • Juxta-articular new bone formation on hand/foot XR (1). Five patterns (Moll & Wright): • Asymmetric oligoarthritis (most common). • Symmetric polyarthritis (RA-like). • Distal interphalangeal predominant. • Spondyloarthritis (axial — sacroiliitis, spondylitis). • Arthritis mutilans (severe deformity).