• Ga Young Ahn, Soo-Kyung Cho, Sung Joo Cha, Eunwoo Nam, Jung-Eun Lee, Renée Liliane Dreiser, Emmanuel Maheu, and Yoon-Kyoung Sung.
• Department of Rheumatology, Hanyang University Hospital for Rheumatic Diseases, Seoul, Republic of Korea.
• Int J Rheum Dis. 2018 Dec 1; 21 (12): 2095-2103.

AimThis study aimed to translate the Functional Index for Hand Osteoarthritis (FIHOA) into Korean, and establish its reliability and validity in Korean patients with hand osteoarthritis (OA).MethodThe FIHOA was translated into Korean (K-FIHOA) following cross-cultural adaptation guidelines. The K-FIHOA was pretested on 40 patients with hand OA. The adapted K-FIHOA was then administered to 100 consecutive hand OA patients together with the modified Health Assessment Questionnaire (mHAQ) and visual analog scale (VAS) for hand pain. The test-retest reliability of each item and total scores were assessed using Spearman's correlation coefficient and intraclass correlation coefficient (ICC). The internal consistency reliability was evaluated as Cronbach's alpha. The external construct validity was assessed using the correlation between K-FIHOA, mHAQ and hand pain VAS.ResultsThe test-retest reliability for the total score was strong (r = 0.87 and ICC = 0.83). Cronbach's alpha was also high (0.88), which suggests that there is strong internal coherence in the test items. We identified significant correlations between K-FIHOA and mHAQ (r = 0.52, P < 0.01), mHAQ hand function score, (r = 0.57, P < 0.01) and hand pain VAS (r = 0.53, P < 0.01).ConclusionThe K-FIHOA is a reliable and valid instrument for evaluating functional disability in Korean hand OA patients.© 2018 Asia Pacific League of Associations for Rheumatology and John Wiley & Sons Australia, Ltd.

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