Cross-cultural translation, adaptation and validation of a Japanese version of the functional index for hand osteoarthritis (J-FIHOA)

Abstract

Background Hand osteoarthritis (OA) has a wide spectrum of clinical presentations and physical function is one of the core domains where patients suffer. The Functional Index for Hand Osteoarthritis (FIHOA) is a leading assessment tool for hand OA-related functional impairment. Our objective was to make a Japanese version of FIHOA (J-FIHOA) and validate it among Japanese hand OA patients. Methods Forward and backward translation processes were completed to create a culturally adapted J-FIHOA. A prospective, observational multicenter study was undertaken for the validation process. Seventeen collaborating hospitals recruited Japanese hand OA patients who met the American College of Rheumatology criteria. A medical record review and responses to the following patient-rated questionnaires were collected: J-FIHOA, Hand20, Health Assessment Questionnaire (HAQ), numerical rating scale for pain (NRS pain) and Short Form 36 Health Survey (SF-36). We explored the structure of J-FIHOA using factor analysis. Cronbach’s alpha coefficients and item-total correlations were calculated. Correlations between J-FIHOA and other questionnaires were evaluated for construct validity. Participants in clinically stable conditions repeated J-FIHOA at a one- to two-week interval to assess test-retest reliability. To evaluate responsiveness, symptomatic patients who started new pharmacological treatments had a 1-month follow-up visit and completed the questionnaires twice. Effect size (ES) and standardized response mean (SRM) were calculated with pre- and post-treatment data sets. We assessed responsiveness, comparing ES and SRM of J-FIHOA with other questionnaires (construct approach). Results A total of 210 patients participated. J-FIHOA had unidimensional structure. Cronbach’s alphas (0.914 among females and 0.929 among males) and item-total correlations (range, 0.508 to 0.881) revealed high internal consistency. Hand20, which measures upper extremity disability, was strongly correlated with J-FIHOA (r = 0.82) while the mental and role-social components of SF-36 showed no correlations (r = − 0.24 and − 0.26, respectively). Intraclass correlation coefficient for test-retest reliability was 0.83 and satisfactory. J-FIHOA showed the highest ES and SRM (− 0.68 and − 0.62, respectively) among all questionnaires, except for NRS pain. Conclusions Our results showed J-FIHOA had good measurement properties to assess physical function in Japanese hand OA patients both for ambulatory follow-up in clinical practice, and clinical research and therapeutic trials.

Psychometric analysis of the questionnaires for the assessment of upper limbs available in their Italian version: a systematic review of the structural and psychometric characteristics

“…The SEM value is reported with similar results in all analyzed versions [ 31 , 72 – 74 , 76 ], except in the Turkish [ 75 ] version, where it is not presented. Finally, the MDC value is reported with similar results only in the Dutch and French versions [ 72 , 76 ].…”

“…Reliability was similar between the Italian version and the other analyzed versions [ 29 , 72 – 75 ]; the value of the French version [ 76 ] is slightly lower.…”

“…Regarding internal consistency, the value of the Italian FIHOA [ 30 ] is similar to that of all the analyzed versions [ 72 – 75 ]. The Italian HAMIS [ 76 ] has a value similar to that of the Brazilian version [ 77 ].…”

“…Regarding reliability, the value of the Italian FIHOA [ 30 ] is similar to that of the Dutch and Persian versions [ 72 , 73 ], while the Korean [ 74 ] and Japanese [ 75 ] versions showed slightly lower values. The reliability of the Italian HAMIS [ 76 ] is similar to that of the Brazilian version [ 77 ], while only the original English version was found for the HFDS [ 78 ] with a value similar to that of the Italian version [ 32 ].…”

Translation, cultural adaptation and reproducibility of a Portuguese version of the Functional Index for Hand OsteoArthritis (FIHOA)

“…Although we did not aim to compare total scores among our patients, our mean of 7.4, which could be considered revealing a moderate functional impairment, are lower than values reported in similar studies carried out in Belgium (10.9), Iran (9.9) and Norway (9.3) [10,18,19]. On the other hand, one may consider that our patients presented greater impairment when comparing to scores obtained in studies performing translation of FIHOA in Italy (6.5), Japan (5.5), Morocco (5.0) and Korea (4.4) [11,12,20,21].…”