Article Figures & Data
Figures
- Fig 1.
Typical ‘hidden’ psoriasis in peri-umbilical area (A), scalp (B), natal cleft (C) and nails (D).
- Fig 2.
Dactylitis in the hands (right second and fourth digits and left second digit) and feet (right third digit and left fourth digit).
Tables
Features PsA RA Number of joints involved 30–50% with oligoarthritis Predominant polyarthritis Joint involvement Any joint, including distal interphalangeal joints Usually distal interphalangeal joint sparing Enthesitis Typical, clinically present in 60–80% Not typical Dactylitis Present in 30% Not typical Axial involvement Axial spondyloarthritis phenotype Erosive cervical disease Skin/nail disease Psoriasis in 80%, nail disease in 60% Background population risk or lower Serology Usually RF and CCP negative Usually RF and/or CCP positive Typical radiographic changes Periosteal new bone formation (uncommon especially in early disease) Erosion and osteopenia CCP = cyclic citrullinated peptide; RF = rheumatoid factor
Inflammatory articular disease (joint, spine or entheseal), with three or more points from the following: 1. Evidence of psoriasis (a) Current psoriasis* or Psoriatic skin or scalp disease present today as judged by a rheumatologist or dermatologist (b) Personal history of psoriasis or A history of psoriasis that may be obtained from patient, family doctor, dermatologist, rheumatologist or other qualified healthcare provider (c) Family history of psoriasis A history of psoriasis in a first- or second-degree relative according to patient report 2. Psoriatic nail dystrophy Typical psoriatic nail dystrophy including onycholysis, pitting and hyperkeratosis observed on current physical examination 3. A negative test for rheumatoid factor By any method except latex but preferably by ELISA or nephelometry, according to the local laboratory reference range 4. Dactylitis (a) Current or Swelling of an entire digit (b) History A history of dactylitis recorded by a rheumatologist 5. Radiological evidence of juxta-articular new bone formation Ill-defined ossification near joint margins (but excluding osteophyte formation) on plain radiographs of hand or foot *Current psoriasis scores 2 points. CASPAR = Classification Criteria for Psoriatic Arthritis; ELISA = enzyme-linked immunosorbent assay
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