Juvenile chronic arthritis
| Juvenile idiopathic arthritis | |
|---|---|
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| Classification and external resources | |
| Specialty | rheumatology |
| ICD-10 | M08.0 |
| ICD-9-CM | 714.3 |
| OMIM | 604302 |
| DiseasesDB | 12430 |
| MedlinePlus | 000451 |
| eMedicine | ped/1749 |
| Patient UK | Juvenile idiopathic arthritis |
| MeSH | D001171 |
Juvenile idiopathic arthritis (JIA), also known as juvenile rheumatoid arthritis, is the most common form of arthritis in children and adolescents. ("Juvenile" in this context refers to an onset before age 16, "idiopathic" refers to a condition with no defined cause, and "arthritis" is the inflammation of the synovium of a joint.)
JIA is an autoimmune, noninfective, inflammatory joint disease of more than 6 weeks duration in children less than 16 years of age. The disease commonly occurs in children from the ages of 1 to 6, but it may develop as late as 15 years of age. It is a subset of arthritis seen in childhood, which may be transient and self-limited or chronic. It differs significantly from arthritis commonly seen in adults (osteoarthritis, rheumatoid arthritis), and other types of arthritis that can present in childhood which are chronic conditions (e.g. psoriatic arthritis and ankylosing spondylitis). Aetiopathology is similar to rheumatoid arthritis, but with less marked cartilage erosion, and joint instability and absent rheumatoid factor.
JIA affects about one in 1,000 children in any given year, with about one in 10,000 having a more severe form.
Symptoms of JIA are often nonspecific initially, and include lethargy, reduced physical activity, and poor appetite. The first manifestation, particularly in young children, may be limping. Children may also become quite ill, presenting with flu-like symptoms that persist. The cardinal clinical feature is persistent swelling of the affected joint(s), which commonly include the knee, ankle, wrist, and small joints of the hands and feet. Swelling may be difficult to detect clinically, especially for joints such as those of the spine, sacroiliac joints, shoulder, hip, and jaw, where imaging techniques such as ultrasound or MRI are very useful.
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