Anup Pednekar

Sneh…RERC

PLANTAR ARCH INDEX

Plantar Arch Index- Quantitative measurement for foot assessment/evaluation.

Described by Cavanagh and Rogers.Easy and reliable method.

INTRODUCTION

Measurement

Obtain a Dynamic Footprint of the patient on a GRAPH Paper.

Dynamic footprints are essential as they correlate with the pathology as compared to Static ones.

Divide the foot into 3 equal parts as shown in the figure.

Methodology

In the footprint, a line defined as 'foot axis' was drawn from the tip of the second toe to the centre of the heel.

Two lines perpendicular to the foot axis were drawn tangential to the foot, one on the most posterior aspect of the heel and one on the most anterior aspect of the footprint excluding the toes, in front of the metatarsal heads.

The part of the foot axis between these two lines was trisected into equal parts, dividing the footprint into forefoot, mid-foot, and hind-foot regions.

The arch index is defined as the area of the mid-foot divided by the total area of the footprint, ignoring the toes

ARCH INDEX= B/A+B+CA-Area of ForefootB-Area of Mid-footC-Area of Hind-foot

Formula

All obtained arch indexes- categorized into three different foot types using a classification system as suggested by Cavanagh and Rogers.

An arch index =< 0.21 was indicative of a high arch

An arch index between 0.21 and 0.26 indicated a normal arch

An arch index >= 0.26 indicated a flat or low arch.

Inferences

Cavanagh PR, Rodgers MM. The arch index: A useful measure from footprints. J Biomechanics 1987;20:547-51.

McCrory JL, Young MJ, Boulton AJM, Cavanagh PR. Arch index as a predictor of arch height. Foot 1997;7:79-81.

Hernandez AJ, Kimura LK, Laraya MHF, Favaro E. Calculation of staheli’s plantar arch index and prevalence of flat feet: a study with 100children aged 5-9 years. Acta Ortop Bras. [serial on the Internet]. 2007; 15(2):68-71. Available from URL: http://www.scielo.br/aob.

References:

Normative values for the Foot Posture IndexAnthony C Redmond*1, Yvonne Z Crane1 and Hylton B Menz2Address:

1Academic Unit of Musculoskeletal Disease, School of Medicine, University of Leeds, Leeds, UK and 2Musculoskeletal Research Centre,

Faculty of Health Sciences, La Trobe University, Bundoora, Victoria, Australia

Email: Anthony C Redmond* - a.redmond@leeds.ac.uk; Yvonne Z Crane - y.crane@leeds.ac.uk; Hylton B Menz - h.menz@latrobe.edu.au* Corresponding author

Published: 31 July 2008Journal of Foot and Ankle Research 2008, 1:6 doi:10.1186/1757-1146-

1-6Received: 19 May 2008Accepted: 31 July 2008This article is available from: http://www.jfootankleres.com/content/1/1/6

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