**5. Limitations**

Bone segment measurements were performed with an electronic Polhemus Fastrack® goniometer and showed current instability due to inherent human gait fluctuations and sensor noise. The MDC values were higher than the grades obtained in the dynamic PPH valgus and abduction as well as in the static abduction PPH variables. Considering that the percent error set for the device was around 1.6%—and considering that the ±SD and SEM values obtained in the study were under this 1.6%—these results are considered to be statistically valid but with caution.

On the other hand, we were not able to study the effect of order on our sample because didn't write the different orders of each one neither the number of these selections. We assumed the possible "order effect" as "perfectly balanced" because all the study subgroups of each station have the same number of subjects and this can dilutes the "order effect". Future study design should include a section of studying the effect of order of experiments.
