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01-12-2016 | Research | Uitgave 1/2016 Open Access

Journal of Foot and Ankle Research 1/2016

Clinical measures of static foot posture do not agree

Tijdschrift:
Journal of Foot and Ankle Research > Uitgave 1/2016
Auteurs:
Ben Langley, Mary Cramp, Stewart C. Morrison

Abstract

Background

The aim of this study was to determine the level of agreement between common clinical foot classification measures.

Methods

Static foot assessment was undertaken using the Foot Posture Index (FPI-6), rearfoot angle (RFA), medial longitudinal arch angle (MLAA) and navicular drop (ND) in 30 participants (29 ± 6 years, 1.72 ± 0.08 m, 75 ± 18 kg). The right foot was measured on two occasions by one rater within the same test environment. Agreement between the test sessions was initially determined for each measure using the Weighted Kappa. Agreement between the measures was determined using Fleiss Kappa.

Results

Foot classification across the two test occasions was almost perfect for MLAA (Kw = .92) and FPI-6 (Kw = .92), moderate for RFA (Kw = .60) and fair for ND (Kw = .40) for comparison within the measures. Overall agreement between the measures for foot classification was moderate (Kf = .58).

Conclusion

The findings reported in this study highlight discrepancies between the chosen foot classification measures. The FPI-6 was a reliable multi-planar measure whereas navicular drop emerged as an unreliable measure with only fair agreement across test sessions. The use of this measure for foot assessment is discouraged. The lack of strong consensus between measures for foot classification underpins the need for a consensus on appropriate clinical measures of foot structure.

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