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dc.contributor.authorJette, Alan M.en_US
dc.contributor.authorMcDonough, Christine M.en_US
dc.contributor.authorNi, Pengshengen_US
dc.contributor.authorHaley, Stephen M.en_US
dc.contributor.authorHambleton, Ronald K.en_US
dc.contributor.authorOlarsch, Sippyen_US
dc.contributor.authorHunter, David J.en_US
dc.contributor.authorKim, Young-joen_US
dc.contributor.authorFelson, David T.en_US
dc.date.accessioned2012-01-09T20:51:29Z
dc.date.available2012-01-09T20:51:29Z
dc.date.copyright2009
dc.date.issued2009-7-9
dc.identifier.citationJette, Alan M, Christine M McDonough, Pengsheng Ni, Stephen M Haley, Ronald K Hambleton, Sippy Olarsch, David J Hunter, Young-jo Kim, David T Felson. "A functional difficulty and functional pain instrument for hip and knee osteoarthritis" Arthritis Research & Therapy 11(4):R107. (2009)
dc.identifier.issn1478-6362
dc.identifier.urihttps://hdl.handle.net/2144/2871
dc.description.abstractINTRODUCTION. 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. METHODS. We conducted an extensive literature review, focus groups, and cognitive testing to guide the construction of an item bank consisting of 125 functional activities commonly affected by hip and knee osteoarthritis. We recruited a convenience sample of 328 adults with confirmed hip and/or knee osteoarthritis. Subjects reported their degree of functional difficulty and functional pain in performing each activity in the item bank and completed the Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC). Confirmatory factor analyses were conducted to assess scale uni-dimensionality, and IRT methods were used to calibrate the items and examine the fit of the data. We assessed the performance of OA-FUNCTION-CATs of different lengths relative to the full item bank and WOMAC using CAT simulation analyses. RESULTS. Confirmatory factor analyses revealed distinct functional difficulty and functional pain domains. Descriptive statistics for scores from 5-, 10-, and 15-item CATs were similar to those for the full item bank. The 10-item OA-FUNCTION-CAT scales demonstrated a high degree of accuracy compared with the item bank (r = 0.96 and 0.89, respectively). Compared to the WOMAC, both scales covered a broader score range and demonstrated a higher degree of precision at the ceiling and reliability across the range of scores. CONCLUSIONS. The OA-FUNCTION-CAT provided superior reliability throughout the score range and improved breadth and precision at the ceiling compared with the WOMAC. Further research is needed to assess whether these improvements carry over into superior ability to measure change.en_US
dc.description.sponsorshipNational Institutes of Health (R01 AR 051870, 1F32HD056763, 1P30AG031679); Independent Scientist Award (K02 HD45354-01)en_US
dc.language.isoenen_US
dc.publisherBioMed Centralen_US
dc.rightsCopyright 2009 Jette et al.; licensee BioMed Central Ltd. This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.en_US
dc.rights.urihttp://creativecommons.org/licenses/by/2.0
dc.titleA Functional Difficulty and Functional Pain Instrument for Hip and Knee Osteoarthritisen_US
dc.typeArticleen_US
dc.identifier.doi10.1186/ar2760
dc.identifier.pmid19589168
dc.identifier.pmcid2745788


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Copyright 2009 Jette et al.; licensee BioMed Central Ltd. This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Except where otherwise noted, this item's license is described as Copyright 2009 Jette et al.; licensee BioMed Central Ltd. This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.