*3.4. Results According to ACL-RSI*

Patients were dichotomized by post-operative ACL-RSI into two groups: 20 subjects were allocated in group A (ACL-RSI > 60), while 11 were allocated in group B (ACL-RSI < 60). No statistically significant differences between these two groups were reported concerning average Lysholm, IKDC, ACL-RSI, and Tegner score (*p* = 0.92, 0.69, 0.21, and 0.44, respectively) at baseline.

Between groups, comparisons were performed using individual changes with respect to baseline, in order to adjust for possible biases. A statistically significant difference in favour of group A was recorded for Lysholm score (*p* = 0.020) and Tegner activity level (*p* = 0.006), while a trend for IKDC was observed without statistical significance (*p* = 0.065) (Figure 7). Considering jump tests, the following variable was significantly higher in group A: Side Hop test LSI (*p* < 0.05) (Figure 8). No differences concerning other jump tests were recorded between the two groups (*p* = n.s.).

**Figure 7.** Box-plots showing differences between the two groups with the same change compared to the baseline for the various parameters. The black line inside the box represents median value. The lowest bar represents the 10th percentile, the bottom and top of the boxes represent the interquartile range (25th and 75th percentiles), and the top bar represents the 90th percentile. \* *p* < 0.05.

**Figure 8.** Box-plot showing differences in Side Hop test LSI between the two groups. The black

line inside the box represents median value. The lowest bar represents the minimum value, the bottom and top of the box represent the interquartile range (25th and 75th percentiles), and the top bar represents the maximum value. \* *p* < 0.05.
