Clinical measures of static foot posture do not agree

Morrison, Stewart C.; Langley, Ben; Cramp, Mary; Morrison, Stewart

Abstract

© 2016 The Author(s). 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.

• Journal Article Type: Article
• Acceptance Date: Nov 25, 2016
• Publication Date: Dec 1, 2016
• Deposit Date: Feb 15, 2017
• Publicly Available Date: Feb 15, 2017
• Journal: Journal of Foot and Ankle Research
• Print ISSN: 1757-1146
• Publisher: BioMed Central
• Peer Reviewed: Peer Reviewed
• Volume: 9
• Issue: 1
• DOI: https://doi.org/10.1186/s13047-016-0180-3
• Keywords: morphology, pes planus, pes cavus, foot classification, agreement
• Public URL: https://uwe-repository.worktribe.com/output/905180
• Publisher URL: http://dx.doi.org/10.1186/s13047-016-0180-3
• Contract Date: Feb 15, 2017