The objectives of this study were to develop a functional outcome instrument for hip and knee osteoarthritis research (OA-FUNCTION-CAT) using item response theory (IRT) and computer adaptive test (CAT) methods and to assess its psychometric performance compared to the current standard in the field.
Health & Disability Research Institute, Boston University School of Public Health, Boston University, 715 Albany Street, Boston, MA 02118, USA. ajette@bu.edu
