## 2 Case Report
### Rehabilitation Exercise Protocol  
The entire rehabilitation exercise program used in this case is summarized in Table 2 (e.g., set, repetition, and duration of each exercise, and phase of the goal).  
\begin{table}
\begin{tabular}{l l l l l} \hline \hline \multicolumn{1}{c}{**Phase**} & \multicolumn{1}{c}{**Exercise and Treatment**} & \multicolumn{1}{c}{**Set/Repetition, Duration**} & \multicolumn{1}{c}{**Goal**} \\ \hline \hline \multirow{2}{*}{\begin{tabular}{l} L: Protective \\ (4–24 days after surgery) \\ \end{tabular} } & Quad-set & \(5/15\) s on, \(5\) s off & \multirow{2}{*}{\begin{tabular}{l} Reduce effusion, inflammation, and swelling \\ Restor full ROM \\ Restor free flexion, extension \\ activity of quadriceps muscle \\ Enable full weight bearing \\ \end{tabular} } \\ \cline{2-2}  & Standing heel raise & \(3/10\) & & \\ \cline{2-2}  & Single leg raise (0\({}^{\circ}\), 30\({}^{\circ}\), 45\({}^{\circ}\), - 30\({}^{\circ}\), - 45\({}^{\circ}\)) & 3/10 & & \\ \cline{2-2}  & Wall slide & \(1/10\) & & \\ \cline{2-2}  & Weight shift & \(3/1\) min & & \\ \cline{2-2}  & Patella joint mobilization & \(30\) times/direction & & \\ \cline{2-2}  & Standing physioull squat & \(3/10\) & & \\ \cline{2-2}  & Ising & \(20\) min & & \\ \cline{2-2}  & St up & \(3/60\) & & \\ \cline{2-2}  & Prozoirception (brace locked at 0 degrees) & \(-3/3\) & & \\ -DI, D2 pattern & \(-3/3\) & & & \\ -Throwing a ball with single leg standing & \(-3/3\) & & \\ \cline{2-2}  & Arm ergometer & \(1/15\) min & & \\ \cline{2-2}  & Ising & \(20\) min & & \\ \hline \hline \multirow{2}{*}{\begin{tabular}{l} II: Restorative \\ (25\(\sim\)37 days after surgery) \\ \end{tabular} } & Aqua running (with four kick board) & - & \multirow{2}{*}{\begin{tabular}{l} •} \\ \end{tabular} & Improve the strength of the \\ \cline{2-2}  & Quad set & & \(5/15\) s on, \(5\) s off & \multirow{2}{*}{\begin{tabular}{l} •} \\ \end{tabular} & \\ \cline{2-2}  & Standing heel raise & \(3/10\) & & \\ \cline{2-2}  & Single leg raise (flexion, extension, abduction, addiction) & \(3/10\) & & \\ \cline{2-2}  & Active ROM of knee flexion & \(1/10\) & & \\ \cline{2-2}  & Weight shift & \(3/12\) & & \\ \cline{2-2}  & Patella joint mobilization & \(30\) times/direction & & \\ \cline{2-2}  & Standing physioull squat & \(3/10\) & & \\ \cline{2-2}  & Lunge (star, not deep) & \(3/4\) & & \\ \cline{2-2}  & Uninjured single leg balance (close eyes, say \"go.\" open eyes, catch) & & \\ \cline{2-2}  & Superman (arms and legs up together, alternating legs and arms) & & \\ \cline{2-2}  & Supine dead-bug & \(2/5\) & & \\ \cline{2-2}  & Perturbation for each side with & \(3/1\) min/side & \\ \cline{2-2}  & eye-closed & & \\ \cline{2-2}  & Upper thigh massage & \(1/10\) min & & \\ \cline{2-2}  & hamsstring, litotibial band, and calf stretching & \(1/10\) min & & \\ \cline{2-2}  & Ising & \(1/20\) min & & \\ \hline \multirow{2}{*}{\
\begin{tabular}{l} III: \\ Return to full functional \\ activity (38–71 days after surgery) \\ \end{tabular} } & Start step, step box & \(1/5\) min, \(5\) min & \multirow{2}{*}{
\begin{tabular}{l} •} \\ \end{tabular} & Recover full ROM without pain \\ \cline{2-2}  & Stationary bicycle & \(1/10\) min & & \\ \cline{2-2}  & Nordic hamstrings & \(3/10\) & & \\ \cline{2-2}  & Back squat (80 kg) & \(3/10\) & & \\ \cline{2-2}  & Kettle bell deadlift (20 kg) & \(4/10\) & & \\ \cline{2-2}  & Single leg kettle bell pick-up on star & \(5/3\) & & \\ \cline{2-2}  & excursion & & \\ \cline{2-2}  & Lateral monster walks & \(2/2\) & & \\ \cline{2-2}  & Side hopping & \(3/3\) & & \\ \cline{2-2}  & Trampoline balance (catch tape roll) & \(3/1\) min & & \\ \cline{2-2}  & Treadmill running 7–8 km & \(1/15\) min & & \\ \hline \hline \end{tabular}
\end{table}
Table 2: Rehabilitation exercise protocol.