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Reliability of the modified Foot Posture Index
Mark W Cornwall1, Thomas G McPoil, Michael Lebec
1Department of Rehabilitation Sciences, Program in Physical Therapy, Northern Arizona University, Flagstaff, AZ 86011, USA.
Journal of the American Podiatric Medical Association
|January 19, 2008
Summary
The revised Foot Posture Index (FPI-6) shows high intrarater reliability but only moderate interrater reliability. Its clinical value, especially for research, is limited due to inconsistent results between different assessors.
Area of Science:
- Podiatry
- Biomechanical Assessment
- Clinical Measurement Tools
Background:
- The Foot Posture Index (FPI) is a tool for assessing static foot posture.
- Previous versions of the FPI had eight criteria.
- A revised version, the FPI-6, uses six criteria.
Purpose of the Study:
- To evaluate the intrarater and interrater reliability of the revised Foot Posture Index (FPI-6).
Main Methods:
- Three raters assessed 92 feet from 46 individuals using the FPI-6.
- Each foot was evaluated twice by each rater.
Main Results:
- High intrarater reliability was observed for the FPI-6.
- Moderate interrater reliability was found for the FPI-6.
- Classifying feet into categories using the raw score did not enhance rater agreement.
Conclusions:
- The FPI-6 demonstrates high consistency when used by the same assessor.
- Interrater reliability is only moderate, suggesting caution is needed when comparing results between different clinicians.
- The FPI-6 may have limited utility in research settings due to variability between raters.
