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Figure 3 | Journal of Foot and Ankle Research

Figure 3

From: A protocol for classifying normal- and flat-arched foot posture for research studies using clinical and radiographic measurements

Figure 3

Arch index. Footprint with reference lines for calculating the arch index. The length of the foot (excluding the toes) is divided into equal thirds to give three regions: A – forefoot; B – midfoot; and C – heel. The arch index is then calculated by dividing the midfoot region (B) by the entire footprint area (i.e. Arch index = B/[A+B+C]).

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