I got my ACL surgery(right) done 6 months ago. But i got it damaged 2years back. So, by the time i do the surgery my right thigh has wasted a bit. There was a 2 inch difference between the circumference of the two thighs. After exercises now it has been reduced upto 2 cm.(less than 1 inch) but now i hear a sound from the knee when i climb stairs and when i do my exercises. Could you please explain me the condition and please let me know the treatments that should be taken immediatly. Thanx a lot