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. Author manuscript; available in PMC: 2012 Jul 10.
Published in final edited form as: Arthritis Care Res (Hoboken). 2011 Jul;63(7):10.1002/acr.20431. doi: 10.1002/acr.20431

Figure 2.

Figure 2

Measurement of foot morphology using the Staheli Arch Index (SAI). From the most distal extent of the forefoot (J) to the most proximal extent of the heel (K), the length of each footprint (L) is divided into thirds in order to define the heel (A), arch (B), and forefoot (C) regions. The SAI is defined as the ratio of the smallest medial to lateral width of the arch region divided by the greatest medial to lateral width of the heel region.