More 6″ Leg Extensions in Gym

At 8am today I tried 2 plates of 6″ leg extensions in the gym. The problematic right knee was aching slightly and was much tighter after doing this. I felt a twingey/tingley feeling and it was tighter when walking. Both knees feel more solid and supported walking up and down the stairs. Crunching of knee had dissipated by 2.30pm. I did notice in the gym that while lowering the right leg slowly I had less control which clearly indicates a weakness here.