(a) stepping speed in RPM at E1,E2,E3, and E4 from the offaxis, pivoting and sliding group during the free pivoting task (FPT), (b) pivoting instability (deg) at E1,E2,E3, and E4 from the offaxis, pivoting and sliding group during the free pivoting task (FPT), (c) stepping speed in RPM at each evaluation from the offaxis, pivoting and sliding group during the free sliding task (FST), (d) sliding instability (mm) at each evaluation from the offaxis, pivoting and sliding group during the free sliding task (FST). Each bar plot indicate 25th (Q1), 50th (Q2), and 75th (Q3) percentiles of the data. The whisker indicates Q3+ 1.5* (Q3-Q1), and Q1-1.5*(Q3-Q1). * indicates p < 0.05.