Psychometric properties of the 12-item Knee injury and Osteoarthritis Outcome Score (KOOS-12) Spanish version for people
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ORIGINAL ARTICLE
Psychometric properties of the 12-item Knee injury and Osteoarthritis Outcome Score (KOOS-12) Spanish version for people with knee osteoarthritis Gabriel Horta-Baas 1,2 & Rodrigo Vargas-Mena 3 & Erik Alejandre 3 & Ingris Peláez-Ballestas 4 & María del Socorro Romero-Figueroa 5 & Gloria Queipo 6,7 Received: 29 July 2020 / Revised: 4 September 2020 / Accepted: 12 September 2020 # International League of Associations for Rheumatology (ILAR) 2020
Abstract To evaluate the validity, reliability, and responsiveness to change of the 12-item Knee injury and Osteoarthritis Outcome Score (KOOS) Spanish version questionnaire. This study was based on a questionnaire validation design. A cross-sectional survey of 199 patients with knee osteoarthritis (KOA) and ten healthy controls was studied to evaluate the validity and reliability of KOOS12. One hundred and sixteen patients were assessed for test-retest reliability, and 38 patients were included for a responsiveness assessment. Structural validity was assessed by the confirmatory factor analysis (CFA). Item response theory-based methods were used to determine the performance of the items. Internal consistency reliability was appropriate for all scales (Cronbach’s alpha = 0.85–0.94). The intra-class correlation coefficient of KOOS-12 scales ranged from 0.60 to 0.71. The CFA and generalized partial credit model showed that KOOS-12 scales presented a good overall model fit. No differential item functioning was found. Convergent validity was demonstrated by strong correlations (Spearman’s rho ≥ 0.70) with KOOS, International Knee Documentation Committee subjective knee evaluation form (IKDC), and Knee Intermittent and Constant Osteoarthritis Pain (ICOAP). Known-groups validity showed that KOOS-12 well discriminated subgroups of patients (radiographic severity and nutritional status). Standardized response means for KOOS-12 scales were ≥ 0.75. Changes in KOOS-12 scales had a moderate to Key Points • KOOS-12 is a short self-reported measure that assesses patient’s opinions about the difficulties they experience due to problems with their knee and also covers aspects of pain, functional limitations, and knee-related quality of life. • The Spanish version of KOOS-12 questionnaire is a valid instrument for measuring the patients’ opinions about their knee and associated problems, and is both reliable and responsiveness to change.
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10067-020-05403-x) contains supplementary material, which is available to authorized users. * Gabriel Horta-Baas [email protected] 1
2
Servicio de Reumatología, Hospital General Regional número 1, Delegación Yucatán, Instituto Mexicano del Seguro Social, Calle 41 número 439 x 34, Colonia Industrial, 97150. Mérida, Yucatán, Mexico Programa de Maestría y Doctorado en Ciencias Médicas, Odontológicas y de la Salud, Doctorado en Ciencias Médicas, Universidad Nacional Autónoma de Mexico, Ciudad de México, Mexico
3
Servicio de Traumatologia y Ortoped
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