- Typically hx psoriasis first (precedes joint sx by ~10y)
- Joint pain and swelling affecting multiple peripheral joints
- Lbp and sacroiliitis common
- Can affect up to 30% of those w/psoriasis
- Red, warm, pain w/movement of joint
- Dactylitis→ finger/toe swelling
- Enthesiitis→ tendon insertion pain/swelling, uveitis, finger nail pitting and/or onycholysis, skin findings of psoriasis
- RF + 10-15% of cases
- Anti-CCP Ab + ~11% of cases