Juvenile Rheumatoid Arthritis: What It Is and How It Is Detected

Juvenile rheumatoid arthritis is not "adult" arthritis in a small body. It is about inflammation of the joints that begins before age 16 and can affect a child's growth and development. Below is a calm breakdown of what this disease is and the steps by which it is confirmed.

What juvenile rheumatoid arthritis (JRA) is

In international practice, the term more often used is juvenile idiopathic arthritis (JIA) — a chronic progressive disease of children and adolescents with predominant joint involvement of unclear etiology and an autoimmune mechanism. The exact causes are unknown; importance is attributed to hereditary and environmental factors such as infections, injuries, hypothermia, insolation, and stress. At the core are uncontrolled immune system reactions leading to chronic inflammation and irreversible changes in the joints.

Forms of JRA: oligoarticular and others

The diagnosis of JIA is a diagnosis of exclusion: it is arthritis of undetermined etiology present for at least 6 weeks and arising before age 16, with other diseases excluded. The systemic variant, polyarthritis (rheumatoid factor negative and positive), oligoarthritis, enthesitis-related arthritis, and psoriatic arthritis are distinguished. The oligoarticular variant begins at the age of 6 months to 6 years, with mono- or asymmetric oligoarthritis, most often of the knee, wrist, and ankle joints; approximately 50% develop uveitis, and in 40% antinuclear factor is detected.

How arthritis manifests in a child and adolescent

The basis is joint syndrome: swelling, hyperemia, local increase in temperature, pain, restricted mobility. The knee, ankle, and wrist joints are most often affected, and involvement of the cervical spine is characteristic. A typical sign is morning stiffness: stiffness in the joints in the morning lasting from 10–15 minutes to several hours. In the systemic form, there may be high fever, rash, lymphadenopathy, hepatosplenomegaly, serous peritonitis, and eye involvement.

• Swelling or effusion in the joint, restricted function
• Tenderness on palpation, local increase in temperature
• Morning stiffness of the joints
• High fever and rash in the systemic variant

How childhood arthritis differs from rheumatoid arthritis in adults

In adults, rheumatoid arthritis usually affects the hands, feet, and wrists. In children, the onset boundary is before age 16, and the picture depends on the variant: in oligoarthritis, lengthening of the affected limb is possible due to irritation of the growth zones, while in the systemic form internal organs are involved. Rheumatoid factor and antibodies to cyclic citrullinated peptide are detected in children in only 6% of cases, so "adult" markers say little here.

Diagnostics: how the diagnosis is confirmed in children

There is no specific test, so the diagnosis is made according to criteria and by exclusion. The doctor asks about symptoms, performs an examination, and orders blood tests and imaging. In the tests, elevated ESR, CRP, IgM, and IgG are noted; tests for rheumatoid factor and antinuclear factor are possible. Sepsis, infections, oncohematological and solid tumors, systemic connective tissue diseases, and inflammatory bowel diseases are excluded first.

Possible complications and when to see a doctor

The disease can disrupt growth and development and also affect other organs. Among the complications are eye involvement (uveitis, iridocyclitis); in the systemic form, inflammation of the pericardium and myocardium, as well as pleuritis (myopericarditis, pleuritis), and growth retardation are possible. If a child has morning joint stiffness, persistent joint swelling, or unexplained fever with rash, this is a reason to see a doctor rather than wait for it to "go away on its own."

The presence of arthritis by itself is not a reason to call an ambulance; 103 or 112 — for signs of a life-threatening condition, for example if a stroke or heart attack is suspected.

This material is for reference and does not replace consultation with a doctor.

This content is for reference and does not replace a doctor's consultation. Medical disclaimer