Two subcategories are recognized: :* Persistent<unk> : Affecting not more than 4 joints throughout the disease course :* Extended<unk> : Affecting a total of more than 4 joints after the first 6 months of disease
Oligoarthritis
Osteoarthritis
Enthesitis
Rheumatism
Reactive arthritis
Inflammatory arthritis
Rheumatoid arthritis
Enteropathic arthropathy