Lately my knee hurts and I have not injured it I know it can't be arthritis (I'm 13) but I did injure it three years ago it locked in place and dislocated and they had to relocated it and ever since it has hurt and I don't know what to do and if there are any doctors or orthopedists looking at this please awnser and tell me you are a doctor or orthopedist it would mean a lot to me if you would and thanks if you do

What should I do

Talk to your parents. Tell them you're still having issues with it and you need to check it out. It could be a number of things and you can't provide enough information for anyone here, even if they're a doctor or a orthopaedic surgeon.

Your best bet is to go and talk to your local medical professionals.