Juvenile Idiopathic Arthritis

Question 1

What is JIA?

Answer 1

Juvenile idiopathic arthritis

Autoimmune inflammation of joints, without any other cause, lasting more than 6 weeks in a patient <16 years

Question 2

What are the subtypes of JIA?

Answer 2

Systemic JIA
Polyarticular JIA
Oligoarticular JIA
Enthesitis related arthritis
Juvenile psoriatic arthritis

Question 3

What is systemic JIA also known as?

Answer 3

Still’s disease

Question 4

What are the features of systemic JIA?

Answer 4

Salmon-pink rash
High fevers
Joint pain

Question 5

What investigations are done for suspected systemic JIA?

Answer 5

ANA -ve
RF -ve

Raised

• CRP
• ESR
• platelets
• ferritin

Question 6

What is a potential complication of systemic JIA?

Answer 6

Macrophage activation syndrome

Question 7

What are features of macrophage activation syndrome?

Answer 7

DIC
Anaemia
Thrombocytopenia
Non-blanching rash

Question 8

What is polyarticular JIA?

Answer 8

Idiopathic arthritis >/= 5 joints

Question 9

What is oligoarticular JIA?

Answer 9

< 4 joints

Question 10

What is oligoarticular JIA associated with?

Answer 10

Anterior uveitis

Question 11

What is enthesitis related arthritis?

Answer 11

Inflammation at site where tendon inserts

Paeds version of spondyloarthropathies

Question 12

What is a key feature of enthesitis related arthritis?

Answer 12

Tender to localised palpation of entheses

Question 13

What are features of juvenile psoriatic arthiritis?

Answer 13

Psoriasis
Nail pitting
Onycholysis 
Dactylitis 
Enthesitis