... conclusions. This method, although effective, is not easy to understand and the results are not immediate, in particular for people who don't work every day with GA and don't have a lot of experience with GA. For this reason, there is a clinical need to identify a single and concise index that is easy to use and to understand, but still preserves the efficacy and precision of locomotor pattern analysis and treatment evaluation. Schutte et Al. [5] proposed a statistical method to calculate the amount by which a subject's gait deviates from an average normal profile, and to represent this deviation as a single number. The method uses principal components analysis to derive a set of 16 independent variables from 16 selected gait variables [6]. This number was defined as the "Normalcy Index" (NI). The aims of this study are: to implement NI calculation by an automatic procedure. The ...

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