boy with swollen right knee joint

Musculoskeletal problems are common presentation in children and adolescents. Diagnosis of rheumatic disease in this age group is based primarily on patient's history and physical examination. Laboratory evaluation is done mostly to support or confirm clinical impression. A case of juvenile spondyloarthropathy is being presented to highlight the approach to rheumatic problems in children. This condition typically begins in adolescence and has a predilection for involvement of the back and the large joints of the lower extremities