S P Mehta1, A Sankar2, V Venkataramanan2, L S Lohmander3, J N Katz4, G A Hawker5, L Gossec6, E M Roos7, J-F Maillefert8, M Kloppenburg9, M Dougados10, A M Davis11. 1. Division of Health Care and Outcomes Research, Kremble Research Institute, Toronto, Ontario, Canada; School of Physical Therapy and Dept. of Orthopedics, Marshall University, Huntington, WV, USA. 2. Division of Health Care and Outcomes Research and Arthritis Community Research and Evaluation Unit, Kremble Research Institute, Toronto, Ontario, Canada. 3. Department of Orthopaedics, Clinical Sciences Lund, Lund University, Lund, Sweden; Institute of Sports and Clinical Biomechanics, University of Southern Denmark, Denmark. 4. Division of Rheumatology, Department of Immunology and Allergy, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA; Department of Orthopedic Surgery, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA; Department of Epidemiology, Harvard School of Public Health, Boston, MA, USA. 5. Division of Rheumatology, Department of Medicine, Women's College Research Institute, Women's College Hospital, University of Toronto, Toronto, Ontario, Canada; Department of Health Policy, Management and Evaluation, University of Toronto, Canada; Adjunct Scientist, Institute of Clinical Evaluative Sciences, Faculty of Medicine, University of Toronto, Canada. 6. UPMC Univ Paris 06, GRC-UPMC 08 (EEMOIS), France; AP-HP, Pitié Salpêtrière Hospital, Department of Rheumatology, Paris, France. 7. Institute of Sports and Clinical Biomechanics, University of Southern Denmark, Denmark. 8. Department of Rheumatology, Dijon University Hospital and INSERM U1093, UFR Medecine, University of Burgondy, France. 9. Department of Rheumatology, Leiden University Medical Center, Leiden, The Netherlands; Department of Clinical Epidemiology, Leiden University Medical Center, Leiden, The Netherlands. 10. Paris Descartes University, Department of Rheumatology-Hôpital Cochin - Assistance Publique - Hôpitaux de Paris, INSERM (U1153): Clinical Epidemiology and Biostatistics, PRES Sorbonne Paris-Cité, France. 11. Division of Health Care and Outcomes Research, Kremble Research Institute, Toronto, Ontario, Canada; Department of Health Policy, Management and Evaluation, University of Toronto, Canada; Department of Rehabilitation Science, University of Toronto, Canada. Electronic address: adavis@uhnresearch.ca.
Abstract
OBJECTIVE: To evaluate the internal consistency and construct validity of the Physical Function short-forms for the Hip and Knee Injury Osteoarthritis Outcome Scores (HOOS-PS/KOOS-PS) and the Intermittent and Constant Osteoarthritis Pain (ICOAP) in a nine country study of patients consulting for total hip or knee replacement (THR or TKR). METHODS: Patients completed HOOS-PS or KOOS-PS, ICOAP and Western Ontario and McMaster Universities' Osteoarthritis Index (WOMAC) pain and physical function subscales at their consultation visit. Internal consistency was calculated using Cronbach's alpha. The association of HOOS-PS/KOOS-PS and ICOAP with WOMAC pain and function subscales was calculated with Spearman correlation coefficients with 95% confidence intervals. RESULTS: HOOS-PS/KOOS-PS and ICOAP demonstrated high internal consistency across countries (alpha 0.75-0.96 (hip) and 0.76-0.95 (knee)). Both HOOS-PS and KOOS-PS demonstrated high correlations (0.76-0.90 and 0.75-0.91, respectively) with WOMAC function in all countries. ICOAP exhibited moderate to high correlations with WOMAC pain and function subscales (0.53-0.84 (hip) and 0.43-0.84 (knee)). CONCLUSION: The psychometric properties of the HOOS-PS/KOOS-PS, and ICOAP were maintained across all countries.
OBJECTIVE: To evaluate the internal consistency and construct validity of the Physical Function short-forms for the Hip and Knee Injury Osteoarthritis Outcome Scores (HOOS-PS/KOOS-PS) and the Intermittent and Constant Osteoarthritis Pain (ICOAP) in a nine country study of patients consulting for total hip or knee replacement (THR or TKR). METHODS:Patients completed HOOS-PS or KOOS-PS, ICOAP and Western Ontario and McMaster Universities' Osteoarthritis Index (WOMAC) pain and physical function subscales at their consultation visit. Internal consistency was calculated using Cronbach's alpha. The association of HOOS-PS/KOOS-PS and ICOAP with WOMAC pain and function subscales was calculated with Spearman correlation coefficients with 95% confidence intervals. RESULTS:HOOS-PS/KOOS-PS and ICOAP demonstrated high internal consistency across countries (alpha 0.75-0.96 (hip) and 0.76-0.95 (knee)). Both HOOS-PS and KOOS-PS demonstrated high correlations (0.76-0.90 and 0.75-0.91, respectively) with WOMAC function in all countries. ICOAP exhibited moderate to high correlations with WOMAC pain and function subscales (0.53-0.84 (hip) and 0.43-0.84 (knee)). CONCLUSION: The psychometric properties of the HOOS-PS/KOOS-PS, and ICOAP were maintained across all countries.
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