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Assessment Procedures

Cross-cultural adaptation and reliability of the Foot Posture Index (FPI-6) – French version

ORCID Icon, , , ORCID Icon &
Pages 1621-1629 | Received 18 Jul 2022, Accepted 12 Apr 2023, Published online: 19 May 2023
 

Abstract

Purpose

The 6-item Foot Posture Index (FPI-6) is a reliable tool for the evaluation of foot deformities. Our aim was to translate and cross-culturally validate the FPI-6 for use in French-speaking countries and to determine the intra-rater and inter-rater reliability of the French version.

Methods

Cross-cultural adaptation was performed according to guidelines. Two clinicians assessed the FPI-6 in 52 asymptomatic individuals. We evaluated intra- and inter-rater reliability with the intraclass correlation coefficients (ICC), correlations (p-value < 0.05) and Bland-Altman plots. Standard error of measurement (SEM) and minimum detectable change (MDC95) were determined.

Results

For the cross-cultural adaptation, we modified several items of the FPI-6 user guide and added footnotes to ensure correct interpretation. ICC of the total FPI-6 scores were 0.94 to 0.96 for the intra- and inter-rater reliability for dominant and non-dominant lower limb. Correlations were significant (p < 0.001); r 0.88 to 0.92. Total score SEM was 0.68 to 0.78 and MDC95 was 1.58 to 1.82.

Conclusions

Intra- and inter-rater reliability of this French version of the FPI-6 was excellent for the total score and good to excellent for each item. The French FPI-6 can be used in French-speaking countries. The identification of SEM and MDC scores is useful for clinical interpretation.

Implications for Rehabilitation

  • The French version of the 6-item Foot Posture Index (FPI-6) can be used in clinical practice in French-speaking countries

  • Intra- and inter-rater reliability of total FPI score are excellent

  • We provide minimal detectable change value for clinical interpretation (1.58 to 1.82)

Acknowledgements

The authors thank Johanna Robertson for language assistance and constructive criticism, and the University of Leeds for supplying the original FPI-6.

Author contributions

Cédric Blouin: Conceptualization, Methodology, Software, Validation, Formal analysis, Investigation, Resources, Data Curation, Writing - Original Draft, Writing - Review & Editing, Visualization, Supervision, Project administration François Genêt: Conceptualization, Methodology, Validation, Visualization, Supervision, Writing - Original Draft, Writing - Review & Editing, Project administration, Funding acquisition Wilfrid Graff: Methodology, Validation, Writing - Original Draft, Writing - Review & Editing, Visualization, Supervision, Project administration Céline Bonnyaud: Conceptualization, Methodology, Software, Validation, Formal analysis, Investigation, Resources, Data Curation, Writing - Original Draft, Writing - Review & Editing, Supervision, Project administration Antoine Perrier: Conceptualization, Methodology, Validation, Investigation, Writing - Original Draft, Writing - Review & Editing, Supervision, Project administration

Disclosure statement

The authors report there are no competing interests to declare.

Additional information

Funding

This research was supported by the Agence Régionale de Santé Île-de-France and the Institut de Santé Parasport Connecté (ISPC).

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