Cross-cultural adaptation and psychometric properties of the Vietnamese version of the Lower Extremity Functional Scale (LEFS) in individuals with knee osteoarthritis
1
Issued Date
2026-12-01
Resource Type
eISSN
25098020
Scopus ID
2-s2.0-105044507437
Journal Title
Journal of Patient Reported Outcomes
Volume
10
Issue
1
Rights Holder(s)
SCOPUS
Bibliographic Citation
Journal of Patient Reported Outcomes Vol.10 No.1 (2026)
Suggested Citation
Huynh V., Tran T., Sinsurin K., Jalayondeja C. Cross-cultural adaptation and psychometric properties of the Vietnamese version of the Lower Extremity Functional Scale (LEFS) in individuals with knee osteoarthritis. Journal of Patient Reported Outcomes Vol.10 No.1 (2026). doi:10.1186/s41687-026-01088-z Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/118060
Title
Cross-cultural adaptation and psychometric properties of the Vietnamese version of the Lower Extremity Functional Scale (LEFS) in individuals with knee osteoarthritis
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Abstract
Objective: To translate, cross-culturally adapt, and examine the psychometric properties of the Vietnamese version of the Lower Extremity Functional Scale (LEFS-V) in individuals with knee osteoarthritis (KOA). Design: A cross-sectional study. Setting: Two hospitals and two Catholic convents in Vietnam. Participants: 174 Vietnamese individuals aged ≥ 45 years with KOA were diagnosed based on clinical examination using the National Institute for Health and Care Excellence (NICE) criteria. Main outcome measures: Participants completed the baseline assessment and 5-7days retest, which included the LEFS-V, Numerical Pain Rating Scale (NPRS), and Knee Injury and Osteoarthritis Outcome Score (KOOS). Psychometric property testing included content validity (CVI), internal consistency (Cronbach’s α), test–retest reliability (ICC <inf>(3,1)</inf>, standard error of measurement (SEM), minimum detectable change (MDC95), and construct validity. Spearman correlations were used to examine associations with the KOOS subscales and NPRS. Results: Strong content validity with item-CVI from 0.83 to 1.00. LEFS-V demonstrated high internal consistency (Cronbach’s α = 0.942) and excellent test–retest reliability (ICC <inf>(3,1)</inf> = 0.985; 95% CI: 0.974–0.991), SEM = 1.4 and MDC<inf>95</inf> = 3.88. LEFS-V correlated positively with KOOS-Pain (r<inf>s</inf> = 0.59), KOOS-Symptoms (r<inf>s</inf> = 0.30), KOOS-ADL (r<inf>s</inf> = 0.71), KOOS-Sport/Rec (r<inf>s</inf> = 0.50), and KOOS-QoL (r<inf>s</inf> = 0.18), and negatively with NPRS (r<inf>s</inf> = -0.63). Conclusion: The LEFS-V is a reliable and valid scale for assessing lower extremity functional status in Vietnamese individuals with KOA.