| Abstract/Notes |
Objective: The purpose of this study was to translate, cross-culturally adapt, and validate the Measure of Intermittent and Constant Osteoarthritis Pain (ICOAP) hip into Brazilian Portuguese in individuals with hip osteoarthritis (OA).
Methods: One hundred thirty individuals with hip OA participated in the study, 30 in stage 1, transcultural translation and adaptation, and 100 in stage 2, structural validity. Convergent validity was assessed using the Spearman correlation by applying the Numeric Rating Pain Scale (NRPS), the Hip Dysfunction and Osteoarthritis Outcome Score (HOOS), and the Short Form 36 Health Survey (SF-36). The internal structure was evaluated by exploratory and confirmatory factor analysis with the fit indices chi-square/degrees of freedom (DF), Root Mean Square Error of Approximation (RMSEA), Standardized Root Mean Square Residual (SRMR), Comparative Fit Index (CFI), Tucker Lewis Index (TLI), and floor and ceiling effects. Of the 100 participants, a subsample of 50 was used to assess test-retest reliability using the intra-class correlation coefficient (ICC), standard error of measurement (SEM), minimum detectable change (MDC), and internal consistency by Cronbach's alpha (α).
Results: the ICOAP hip showed adequate values for all fit indices: chi-square/GL = 1.05; CFI = 1.00; TLI = 1.00; RMSEA (90% CI) = 0.024 (0.000 to 0.073); SRMR = 0.031. The reliability analysis presented excellent test-retest reliability and internal consistency values >0.90. Regarding convergent validity, correlations >0.50 were found between the ICOAP hip constant pain and HOOS, SF-36, and the NRPS.
Conclusion: The ICOAP hip in Brazilian Portuguese presents acceptable psychometric properties, supporting its use in individuals with hip OA.
Keywords: Chronic Pain; Hip Joint; Hip Osteoarthritis; Patient-Reported Outcome Measures; Rehabilitation.
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