During this time period, due to training of the contralateral limb with home-exercise program in all groups, CE effects on quadriceps strength in reconstructed limbs could also be observed in the control group; however, greater quadriceps strength changes in the reconstructed limbs in the experimental groups with even greater strength changes in contralateral limb in the control group may demonstrate that the beneficial effects of isokinetic contralateral limb training may be persistent.