Patients will receive a rehabilitation protocol starting with knee training followed by ankle training.

Patients will receive a rehabilitation protocol starting with ankle training followed by knee training.

Patients will start with knee exercise program that includes

• Partial Squats: The exercise will be performed as 3 sets of 10 repetitions each day.
• Toe Raises: The exercise will be performed as 3 sets of 10 repetitions each day.
• Stationary bike will be used (10-15 minutes /day) when the patients can bend their knees at least 100 degrees, as cycling is considered as an excellent conditioning and building exercise for the quadriceps muscles. As the patient's ability to pedal the bike with the operative leg improved, the therapist will increase the resistance.
• Hamstring exercises: After 6 weeks, the hamstring muscles will be exercised by the patient pulling the heel back producing a hamstring contraction.

Then, Patients will start ankle exercises program that includes:

• Standing calf raises
• Foot lift
• Ankle eversion exercises
• Ankle Plantarflexion exercises

Knee joint flexion torque (Nm/kg) in the supporting (stance) phase for each subject will be recorded using a 3D gait analysis system.

Knee joint extension torque (Nm/kg) in the supporting (stance) phase for each subject will be recorded using a 3D gait analysis system.