I dislocated my knee and damaged the miniscus when I was in the 8th grade. I had surgery to repair the damage, but I have arthritis in it now. I am 290 pounds and I have been exercising and dieting for the last month. I started taking Tae Kwon Do as a form of exercise. I was doing a side kick and had to pivot my foot on carpet and I felt my knee pop and now I cannot straighten it. There is a very slight dull pain on the inside of my knee, but it doesn't seem to be swollen. I was wondering what is wrong and how long it will be before I can go back to Tae Kwon Do.