Info
Psoriatic arthritis subtypes
- Mono/oligoarticular (large or DIP joint, dactylitic digit):
- Most common initial manifestation
- Large joint involvement
- Distal interphalangeal (DIP) joint involvement
- Dactylitic digit (sausage-like swelling of a finger or toe)
- Polyarthritis (small joints of the hands/feet, wrists, ankles, knees, elbows):
- Indistinguishable from Rheumatoid Arthritis (RA) but often asymmetric
- Arthritis mutilans:
- Severe destructive arthritis with bone resorption, especially in the hands
- Axial disease:
- Unilateral/asymmetric sacroiliitis
- DIP-limited:
- Good correlation with nail pitting and onycholysis