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. Author manuscript; available in PMC: 2013 Feb 1.
Published in final edited form as: Gait Posture. 2011 Nov 8;35(2):298–300. doi: 10.1016/j.gaitpost.2011.09.104

Figure 1.

Figure 1

Calculation of the SI. The location of the COP at initial contact along the longitudinal axis of the foot coordinate system (A), is normalized by the foot length and multiplied by 100 to obtain a percentage of the foot length.