Functional measures in children with rheumatic diseases.

The measurement of function in children with rheumatic diseases is an intimate part of not only the initial diagnostic work-up, but also of every clinic visit during the course of these chronic diseases. This article focuses on the development of specific and general instruments used to systematically measure function and thus, outcome of the rheumatic diseases and their treatments. Reference is made to instruments developed for use in the general pediatric and adult rheumatology population as a basis for the discussion of the instruments in use in pediatric rheumatology. Specifically, the dimensions of physical function, psychosocial impact, economic impact and quality of life are addressed.