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Investigation of the Relationships Among Clinical Measures of Foot Posture in Individuals with and Without Pronated Foot

Muge Kirmizi
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Mehmet Alphan Cakiroglu
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Yesim Salik Sengul
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Ata Elvan
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Ibrahim Engin Simsek
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Salih Angin
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Background

Many indirect clinical techniques have been developed to assess foot posture; however, there is relatively little research investigating the relationships among these techniques. We investigated the relationships among the most commonly used clinical measures of foot posture—Foot Posture Index-6 (FPI-6), navicular drop (NDP), navicular drift (NDT), and static and dynamic arch indices (SAI and DAI)—in individuals with normal foot posture and those with pronated foot.

Methods

Sixty-three individuals with FPI-6 scores of 0 to 12 were included. A digital caliper was used to measure NDP and NDT; SAI and DAI were measured by electronic pedobarography. Assessments were applied on the dominant foot. Pearson correlation coefficients were calculated to determine the relationships among measures. Participants were classified into two groups, pronated foot (n = 33) and normal foot posture (n = 30), based on FPI-6 scores, providing a multisegmental and multiplanar assessment. The independent-samples t test was used to compare groups regarding NDP, NDT, SAI, and DAI.

Results

We found a high correlation between NDP and FPI-6 (r = 0.754) and between NDP and NDT (r = 0.778) (all P < .001). A moderate correlation was found between NDT and FPI-6 (r = 0.599) and between DAI and SAI (r = 0.519) (all P < .001). A negligible correlation was found between NDP and DAI (r = 0.268; P = .033). Furthermore, NDP, NDT, and DAI values were higher in individuals with pronated foot compared with those with normal posture (P < .001 for NDP and NDT; P = .022 for DAI), whereas SAI values were not (P = .837).

Conclusions

These results suggest that there are moderate-to-strong relationships among FPI-6, NDP, and NDT and between SAI and DAI. The NDP, NDT, and DAI are suitable for the classification of foot posture based on FPI-6 scores. This study can guide clinicians and researchers to associate the foot posture measures with each other.

Institute of Health Sciences, Dokuz Eylul University, Balcova, Izmir, Turkey.

Department of Physiotherapy and Rehabilitation, Faculty of Health Sciences, Izmir Katip Celebi University, Cigli, Izmir, Turkey.

School of Physical Therapy and Rehabilitation, Dokuz Eylul University, Balcova, Izmir, Turkey.

Faculty of Health Sciences, Cyprus International University, Nicosia, Cyprus.

Corresponding author: Muge Kirmizi, MSc, Department of Physiotherapy and Rehabilitation, Faculty of Health Sciences, Izmir Katip Celebi University, Cigli, TR-35620, Izmir, Turkey (E-mail: mugekirmizi@hotmail.com)
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