Oligoarticular juvenile idiopathic arthritis
- Thomas JA Lehman, MD
Thomas JA Lehman, MD
- Section Editor — Pediatric Rheumatology
- Professor of Clinical Pediatrics
- Cornell University Medical College
Oligoarticular juvenile idiopathic arthritis (JIA) (formerly called pauciarthritis or pauciarticular onset juvenile rheumatoid arthritis) is the subset of JIA that includes patients with involvement of fewer than five joints. It is the most common subgroup, constituting about 50 percent of cases of JIA (table 1). A proposed nomenclature divides this group into persistent oligoarticular JIA (no additional joint involvement after the first six months of illness) and extended oligoarticular JIA (involvement of four or less joints during the first six months of illness; additional joints are involved over time, resulting in more than four joints ultimately being affected). (See "Classification of juvenile arthritis".)
The clinical issues related to oligoarticular JIA are discussed in this review. Systemic JIA and polyarticular JIA are discussed separately. (See "Systemic juvenile idiopathic arthritis: Clinical manifestations and diagnosis" and "Polyarticular juvenile idiopathic arthritis: Clinical manifestations and diagnosis".)
Oligoarticular juvenile idiopathic arthritis (JIA) affects females more often than males, as does polyarticular disease. The peak incidence of oligoarticular JIA is in the second and third years. It is less common over 5 years of age and rarely begins after age 10. A child with large joint involvement beginning in the early teenage years most commonly has a spondyloarthropathy. The spondyloarthropathies are called "enthesitis-related arthritis", which is a distinct subset of juvenile idiopathic arthritis (JIA) in the new nomenclature. (See "Spondyloarthropathy in children".)
The typical child with oligoarticular JIA is a girl who is noticed to be limping without complaint. Often the family notices that the child "walks funny" in the morning, but after a little while seems fine. In many cases, the child has never complained of pain; the family seeks medical advice only because the knee is swollen. It is unusual for the family to be able to specify exactly when the illness started.
Oligoarticular JIA affects the large joints (knees, ankles, wrists, elbows), but virtually never begins in the hips. There are several other types of arthritis that may have oligoarticular onset in this age group, but are not juvenile rheumatoid arthritis (JRA). However, under the new nomenclature these conditions are covered under the classification of oligoarticular JIA. Systemic manifestations (other than uveitis) are characteristically absent. Thus, fever, rash, or other constitutional symptoms suggest a different diagnosis. (See 'Differential diagnosis' below.)
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