Background: The main aim of this study is to perform a cross-cultural adaptation and validation of the Visual Analogue Scale for the Foot and Ankle (VASFA) questionnaire, creating a Spanish-language version (VASFA-Sp), and to determine the measurement properties of this instrument. Methods: VASFA was cross-culturally translated into Spanish following the guidelines of the International Society for Pharmacoeconomics and Outcomes Research (ISPOR). The study sample was composed of 228 participants who were recruited from February to May 2022. All were at least 18 years old, gave signed informed consent to take part and properly completed the Foot and Ankle Ability Measures-Sp and VASFA-Sp questionnaires. Cronbach’s alpha and test/re-test reliability values were calculated. Structural validity was assessed via exploratory factor analysis. Results: The 228 patients included in the final analysis presented the following characteristics: 35.53% were male and 64.47% were female; the mean age was 35.95 (18–81) years; and the mean body mass index was 23.79. Internal consistency was excellent. The Cronbach’s alpha for VASFA-Sp was 0.96 and the intraclass correlation coefficient was 0.932 (95% CI; 0.84 to 0.97). Exploratory factor analysis identified one main factor. Conclusions: VASFA-Sp is a reliable, valid and sensitive questionnaire that is suitable for measuring perceived foot and ankle function impairment in a Spanish-speaking population.

Background. The Foot and Ankle Ability Measure is frequently used by clinicians and researchers to assess the effectiveness of therapeutic interventions for patients with foot and ankle pathologies. To review different versions of the FAAM and to evaluate the methodological quality of studies published in this respect. Methods. Systematic review. Setting. A search was conducted in the PubMed, SCOPUS, PEDro, PROSPERO and SPORTDiscus databases, applying the following inclusion criteria: validation studies of the Foot and Ankle Ability Measure, in different languages, with no time limit, in a population aged ≥18 years. Two of the present authors independently assessed the quality of the studies located and extracted the relevant data. The COSMIN checklist was employed to assess methodological quality. Results. Thirteen instruments met the inclusion criteria for this review. In many cases, significant methodological flaws were detected, mostly regarding criterion validity and measurement error. Conclusion. Only the Spanish-language cultural adaptation of the FAAM presents adequate methodological quality. Further studies, with greater methodological rigour, are required of the cultural adaptations of this measurement instrument.