Jia And The Relationship To Adult Arthritides

A WHO/International League Against Rheumatism (ILAR) report in 1995 (7,8) proposed the now widely accepted classification based on clinical patterns, including seven different subtypes of JIA. These subtypes include: systemic onset arthritis, oligo-arthritis and extended oligo-arthritis, rheumatoid factor positive polyarthritis, rheumatoid factor negative polyarthritis, enthesitis-related arthritis and psoriatic arthritis (Table 1). An eighth category "other" is also included in the classification. The criteria that exclude an individual from one of the subtypes above and place them in the "other" category have been the cause of some debate. Exclusion criteria include specific disease states causing joint inflammation, such as systemic lupus erythematosus, rheumatic fever, septic arthritis and neoplasia.

Table 1 The Frequencies of JIA Subsets Observed in the United Kingdom

JIA subset Frequency %

Table 1 The Frequencies of JIA Subsets Observed in the United Kingdom

JIA subset Frequency %

Persistent oligo-arthritis JIA

50

Extended oligo-arthritis JIA

Polyarthritis (RhF -ve) JIA

17

Systemic onset JIA

11

Enthesitis-related JIA

10

Psoriatic JIA

7

Polyarthritis (RhF +ve) JIA

3

Source: Adapted from Ref. 1.

Source: Adapted from Ref. 1.

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