Psoriatic arthritis classification

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Chandrakala Yannam, MD [2]


According to the severity of the disease, psoriatic arthritis may be classified into mild, moderate, and severe form of arthritis.


  • Based on the severity, psoriatic arthritis may be classified into following categories:[1]
    • Mild
    • Moderate
    • Severe
Organ system involvement Mild psoriatic arthritis Moderate psoriatic arthritis Severe psoriatic arthritis
Peripheral arthritis <5 joints involvement

No damage can be seen on x-ray

No loss of physical function

Minimal impact on patient's quality of life

⩾5 joints involvement

Damage can be visible on x-ray

Non-responsive to NSAIDs

Moderate impact on patient's quality of life

⩾5 joints involvement

Severe damage may be seen on x-ray

Nonresponsive to NSAIDs, standard DMARDs

Severe impact on patient's quality of life

Axial joint involvement Mild pain present

No loss of physical function

Loss of physical function

Bath Ankylosing Spondylitis Disability Activity Index (BASDAI) >4

Failure of response
Skin Body Surface Area ( BSA) <5

Psoriasis area and severity index (PASI) <5

Resistant to topical therapy

Dermatology Life Quality Index (DLQI)<10


BSA>10, DLQI>10PASI>10
Dactylitis +/- Pain

Normal activity/ function

Presence of erosive disease or loss of physical function Failure of response to NSAIDs and conventional DMARDs
Enthesitis Number of sites involved:1–2

No loss of physical function

Number of sites involved >2


Loss of function

Loss of function

>2 sites involvement and failure of response


  1. Ritchlin CT, Kavanaugh A, Gladman DD, Mease PJ, Helliwell P, Boehncke WH, de Vlam K, Fiorentino D, Fitzgerald O, Gottlieb AB, McHugh NJ, Nash P, Qureshi AA, Soriano ER, Taylor WJ (September 2009). "Treatment recommendations for psoriatic arthritis". Ann. Rheum. Dis. 68 (9): 1387–94. doi:10.1136/ard.2008.094946. PMC 2719080. PMID 18952643.

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