IntroductionPsoriatic arthritis (PsA) – a spondyloarthropathy – is a heterogeneous and potentially severe rheumatic disease. While PsA can occur at any age, its usual age of onset is between the ages of 35 and 45 ; more than 20 % of psoriasis patients in Germany are thought to be affected . Overall, 0.1–1 % of the population have some form of PsA . In approximately 70 % of cases, joint involvement is preceded by cutaneous manifestations. However, the latter may also develop simultaneously (approximately 15 %), at a later point in time (approximately 10 %), or not at all (5 %) .Clinically, PsA is characterized by rheumatoid factor‐negative oligo‐ or polyarthritis, enthesitis (inflammation of tendon insertions), dactylitis (inflammation of an entire toe or finger), and/or spondylitis. Roughly 3–5 % of PsA patients develop mutilating arthritis, a destructive disease variant .Correct and early diagnosis paramount as regards the progression of PsA; however, given the heterogeneous nature of the disease, establishing the diagnosis poses a challenge to the various medical specialties involved . The interval between initial disease manifestations and confirmation of the diagnosis is, on average, five years . Evidence of an active inflammatory musculoskeletal disease is a crucial step in diagnosing PsA. Since 2006, the Classification
Journal Der Deutschen Dermatologischen Gesellschaft – Wiley
Published: Jan 1, 2018
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