**2.1 Statistic analysis**

A descriptive analysis of all the variables collected was carried out.

The degree of use of treatment, the satisfaction with it and the evolution of pain were analyzed at month, at 3 months and at 6 months. To do this, tests were used for paired data, using the Student t test or the Wilcoxon signed rank test for numerical variables and the McNemar test for qualitative variables.

**Figure 1.** *Rearfoot control.*

The variables related to the effectiveness and satisfaction with the applied treatment were also analyzed. To do this, we used the Student t-test or the Mann– Whitney test for numerical data and the chi-square test or Fisher's exact test for the comparison of percentages. The correlation between quantitative parameters was performed with Spearman's rho correlation coefficient. The normality of the variables was determined by the Kolmogorov–Smirnov test.
