Distinctive Features
- Dactylitis — whole finger/toe swelling ('sausage digit')
- Enthesitis — pain where tendons attach to bone (e.g. Achilles tendon, heel)
- Nail changes — pitting, separation from nail bed
- Asymmetric joint involvement (unlike symmetric rheumatoid arthritis pattern)
- Lower back/sacroiliac joint involvement in some patients
Diagnosis
Diagnosis combines clinical examination, psoriasis history (personal or family), imaging (X-ray, ultrasound, MRI showing enthesitis or erosions), and blood tests (typically negative rheumatoid factor, distinguishing from RA, though this isn't always definitive).Treatment Approach
| Severity | Treatment |
|---|---|
| Mild | NSAIDs, physiotherapy |
| Moderate | Conventional DMARDs (methotrexate) — treats both joints and skin |
| Moderate-severe/inadequate response | Biologics (TNF inhibitors, IL-17 inhibitors, IL-23 inhibitors) — highly effective for both skin and joints |
Skin and Joint Treatment Often OverlapMany treatments for psoriatic arthritis (methotrexate, biologics) treat both the joint and skin manifestations simultaneously — a key advantage over treating each separately, and an important consideration in treatment selection.
Can you have psoriatic arthritis without visible psoriasis?
Yes, in a minority of cases, joint symptoms can precede visible skin psoriasis by years — a family history of psoriasis and specific joint patterns can raise suspicion even without obvious skin involvement.
Is psoriatic arthritis the same as rheumatoid arthritis?
No — while both cause joint inflammation, they have different patterns (psoriatic often asymmetric, includes dactylitis/enthesitis), different antibody profiles, and some different treatment considerations, though there's overlap in medications used.
Medical Disclaimer: This page is for general education only and does not replace professional medical advice. Always consult a qualified healthcare provider.