Psoriatic Arthritis

Question 1

What is the Classification criteria for Psoriatic Arthritis (CASPAR)?

Answer 1

1. Psoriasis
   
   • current
   • personal
   • family history (1st or 2nd degree relative)
2. Nail dystrophy typical of psoriasis (onycholysis, pitting, hyperkeratosis) must be current
3. Negative rheumatoid factor (any method except latex)
4. Dactylitis (current, or historical if recorded by a rheumatologist)
5. Juxtaarticular new bone formation (ill defined ossification near joint margins excluding osteophytes)

Question 2

How many points do you need for classification of Psa?

Answer 2

equal to or more than 3 points

Question 3

What are the 5 distinct phenotypes of psoriatic arthritis? (OPDAS)

Answer 3

1. Oligoarticular (>70%)
2. Polyarthritis/symmetric (15%)
3. Distal interphalangeal joint predominant (5%)
4. Spondyloarthritis (5%)
5. Arthritis mutilans (5%)