## 3 Results
### Objective Knee Evaluation  
After the ACL rehabilitation program with the proprioceptive elements, patients (group A) had significantly higher values in the relative isokinetic knee flexors (\(p\) = 0.024) and extensors (\(p\) = 0.044) in the intact limb, in comparison to the patients rehabilitated without proprioception elements (group B, Table 3). However, there were no statistically important differences between the groups regarding the absolute isokinetic strength and the knee flexor/extensor ratio. Higher values for the Lachman and the drawer tests were observed for the patients rehabilitated with the proprioception exercises (Table 4). However, they were not significantly important. In a comparative analysis of the visual proprioceptive control results, the distribution of the parameters for groups A and B did not differ significantly (Table 5). Very good (4.1-5.0) and excellent (5.1-6.0) results were observed in the static Riva tests (STR). In the dynamic test (DTR, the results were very good. However, the cases of insufficient level occurred more frequently in group B. A strong negative correlation was observed between the visual proprioceptive control results and the isokinetic parameters for the operated limb: peak torque/weight for extensors muscles (Ext) (r = \(-\)0.609, \(p\) = 0.00) and flexors muscles (Flx)/Ext ratio (r = \(-\)0.681, \(p\) = 0.001). \begin{table}
\begin{tabular}{c c c c} \hline \hline
**Test** & **Group A** & **Group B** & \(p\) \\ \hline IKDC & 76.2 \(\pm\) 10.2 (54.0–87.0) & 75.1 \(\pm\) 7.8 (59.0–86.0) & 0.398 \\ Lysholm & 93.5 \(\pm\) 10.2 (66.0–100.0) & 90.3 \(\pm\) 9.7 (65.0–100.0) & 0.091 \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Mechanical knee stability in anterior cruciate ligament (ACL) patients. Values are presented as median \(\pm\) standard deviation. The minimum and maximum values are given in brackets. \(p\) values are indicated. IKDC—International Knee Documentation Committee score. \begin{table}
\begin{tabular}{c c c c c} \hline \hline
**Test** & **Limb** & **Group A** & **Group B** & \(p\)** \\ \hline \multirow{2}{*}{Lachmann} & Operated & 7.4 \(\pm\) 1.8 (4.0–10.0) & 7.0 \(\pm\) 1.7 (4.0–11.0) & 0.445 \\  & Intact & 6.5 \(\pm\) 2.3 (4.0–12.0) & 6.2 \(\pm\) 1.4 (4.0–10.0) & 0.947 \\ \hline \multirow{2}{*}{Drawer test} & Operated & 7.0 \(\pm\) 1.5 (4.0–10.0) & 6.8 \(\pm\) 1.7 (3.0–11.0) & 0.678 \\  & Intact & 6.1 \(\pm\) 1.5 (4.0–8.0) & 6.3 \(\pm\) 1.7 (3.0–10.0) & 0.758 \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Mechanical knee stability in ACL patients. Values are presented as mean \(\pm\) standard deviation. The minimum and maximum values are given in brackets. \(p\) values are indicated. \begin{table}
\begin{tabular}{c c c c c} \hline \hline
**Test** & **Limb** & **Group A** & **Group B** & \(p\)** \\ \hline \multirow{2}{*}{StRD\_EO} & Operated & 5.5 \(\pm\) 0.6 (4.0–6.0) & 5.0 \(\pm\) 1.7 (4.0–6.0) & 0.478 \\  & Intact & 5.7 \(\pm\) 0.5 (4.0–6.0) & 5.5 \(\pm\) 1.2 (1.0–6.0) & 0.728 \\ \hline \multirow{2}{*}{StRD\_EC} & Operated & 4.3 \(\pm\) 1.2 (1.0–6.0) & 3.9 \(\pm\) 1.6 (1.0–5.5) & 0.698 \\  & Intact & 4.0 \(\pm\) 1.5 (1.0–6.0) & 4.1 \(\pm\) 1.8 (1.0–6.0) & 0.647 \\ \hline \multirow{2}{*}{DTRD} & Operated & 4.5 \(\pm\) 0.5 (3.5–5.5) & 4.4 \(\pm\) 0.7 (3.0–6.0) & 0.779 \\  & Intact & 4.5 \(\pm\) 0.4 (4.0–5.0) & 4.4 \(\pm\) 0.7 (3.0–5.5) & 0.607 \\ \hline \multirow{2}{*}{RF} & Operated & 1.6 \(\pm\) 0.8 (0.0–2.0) & 1.5 \(\pm\) 0.8 (0.0–2.0) & 0.495 \\  & Intact & 1.5 \(\pm\) 0.8 (0.0–2.0) & 1.4 \(\pm\) 0.8 (0.0–2.0) & 0.380 \\ \hline \multirow{2}{*}{IS} & Operated & 4.4 \(\pm\) 1.8 (1.5–9.4) & 5.3 \(\pm\) 2.2 (1.4–11.3) & 0.134 \\  & Intact & 4.6 \(\pm\) 1.9 (2.2–9.2) & 5.2 \(\pm\) 2.7 (2.0–10.2) & 0.627 \\ \hline \multirow{2}{*}{VPC} & Operated & 54.4 \(\pm\) 12.9 (32.3–73.8) & 51.6 \(\pm\) 12.5 (31.7–76.9) & 0.529 \\  & Intact & 53.9 \(\pm\) 14.2 (18.0–73.4) & 53.8 \(\pm\) 14.5 (27.4 –74.3) & 0.945 \\ \hline \hline \end{tabular}
\end{table} 
Table 5: The visual proprioceptive control results.