The purpose of our study was to compare the effectiveness of aggressive and traditional physiotherapy programs for peak torque measurements of knee extensors and flexors at different degrees. 40 patients who had anterior cruciate ligament reconstruction using bone-patellar tendon-bone were examined in this study. Patients were selected in two different groups considering how motivated and physically active they were. Isokinetic dynamometer was used to evaluate the peak torque of knee flexors and extensors. In these latter years isokinetic dynamometer is the most popular and sure method to determine the physiotherapy effectiveness after anterior cruciate ligament reconstruction. Physiotherapy programs were chosen on how patients physically active were. Programs varied with the time period in which goals and exercises were accomplished. Time frame vary from 4 to 9 months, depending on which program is used. Patients were examined 6 months after physiotherapy program was used. The results have shown that the strength of knee flexors and extensors comes back faster using aggressive physiotherapy program right back after anterior cruciate ligament reconstruction. Also time to reach peak torque is less and the angle where the peak torque is reached is smaller. According to our results we can propose, that aggressive physiotherapy must be used at the same day after anterior cruciate ligament reconstruction in order to come back to full activity as soon as possible.