Polyarticular JRA, the second most common form
Polyarticular JRA is the second more common form of JRA, affecting five or more joints of the body (the term ‘poly’ meaning many). It mainly affects smaller joints, such as those in the hands and feet. However, in some cases, it can also affect the larger joints. Polyarticular JRA is typically symmetrical, meaning that it affects the same joints on both the left and right sides of the body.
Around 30% of all children with JRA suffer from this type and some children have a specific type of chemical within their blood, known as rheumatoid factor. These children often have a more severe form of the disease, similar to that of adult RA.