Objective. To review literature in the area of juvenile rheumatoid arthritis that has focused on pain experience, functional losses, and psychosocial functioning.Methods. This article provides a critical review of research addressing these three primary issues.Results. Subjective and behavioral measures have been developed to assess pain in juvenile rheumatoid arthritis patients, but further work is needed to determine the validity and reliability of these instruments. Tools to assess functional losses in juvenile rheumatoid arthritis patients also appear promising in preliminary studies. Patients can be at risk for difficulties in psychosocial functioning, although research suggests that there are a variety of family, parental, and child variables that influence child and sibling adaptation. Methodologic shortcomings prevent definitive conclusions in this area.Conclusions. A1 t hough met hodologic limitations have plagued this research in the past, new advances are facilitating improved understanding of children and adolescents with juvenile rheumatoid arthritis. Implications for future study with this challenging population are offered. Theresa M. Jaworski. PhD, is at the Mayo Clinic Foundation, Rochester, Minnesota.Address correspondence to Theresa M. Jaworski, PhD, Section of Psychology, Mayo Clinic Foundation, 200 First Street, SW, Rochester, MN 55905.Submitted for publication February 3,1993; accepted July 15,1993. 0 11193 by the Arthritis Foundation.Key Words: Juvenile rheumatoid arthritis; Psychosocial aspects; Pain; Assessment.It has been estimated that 60,000 to 250,000 children in the United States are affected with juvenile rheumatoid arthritis (JRA); thus, JRA is one of the most common chronic diseases in children [1,2]. Juvenile rheumatoid arthritis is an inclusive term for children with joint involvement occurring before or at age 16 years. Three distinct forms are recognized at diseaseonset: (1) the systemic form, characterized mainly by fever, rash, and modest arthritis; (2) the pauciarticular form, characterized by involvement of four joints or fewer; and (3) the polyarticular form, which involves more than four joints. The pauci-and polyarticular forms are further subdivided into two types each. Pauciarticular type I occurs mainly in young girls who may also have eye involvement, whereas type I1 is more frequent in older boys and primarily involves the lower extremities and the axial skeleton. The polyarticular form also has two types, seropositive and seronegative (for immunoglobulin M-rheumatoid faotor). (Children with systemic-onset JRA that evolves into polyarthritis and those with seropositive polyarthritis tend to have persistent joint inflammation and joint cdestruction and must cope with chronic pain and experience greater functional losses [3-51. Psychologically-related research has been conducted to better understand three aspects of JRA: (1) the experience of pain in children and adolescents with JRA; ( 2 ) how functional activity levels might be compromised by the disease and t...