its quite tricky to explain, Sqad. It will do it of its own accord when I least expect it and it is really sore. I've been sent for an x-ray but i'm waiting to see the Dr next week. I want it to pop because it kinda needs to and because it feels really uncomfortable otherwise. But I also want to try and keep it moving and do something that doesn't cause any discomfort...i can't get socks on without being in pain or being able to lift my leg up.