Pain went away for me 1.5 months after the operation. After that you will occasionally get pin site pains, muscle pains, hamstring pains but no worries they all eventually subside. Some take longer than others. So as an example, I had a pin site infection on my left leg which lasted about 2 weeks or a little more, caused really bad pain if I moved my leg and it caused my knee bending on that side to get really bad and I am working on that at the moment. 2 weeks ago my right leg was extremely weak but now it is fine. There are tons of little annoying pains and minor problems that will arise during the lengthening but all it takes is a bit of patience and they will go away. Take note though, every time you get the pain ask the doc if it is normal. My trick is to annoy the former patients and the doc as much as possible just to be sure it is nothing serious, that is how I found out I had an infection early on instead of later when it would cause more problems down the line. Knee bending issues, knee straightening issues, leg weakness, nerve pains here and there, muscle pains, muscle spasms, they are all part of the process and it should not scare you.