My Knee Keeps Locking

i have trouble with both my knees but my right one is now becoming very unstable

i can be just sitting relaxing and I move and my knee makes a loud click and locks I have to manually force it to move and that is so painful otherwise it would not go back into position,it's makes a noise when I move it back sometimes like a grating sound

so any one have any ideas what's causing it and what I can do to help myself 

I am waiting to see a orthopaedic surgeon with arthritis in my feet

i have been waiting now for almost 7 months and my appointment keeps getting put back so maybe I could ask when I see him if I ever get to the hospital

in the mean time has any one experianced this and know of anything I can do to help myself ?

 

Sally I have osteoarthritis in both my knee's and that's the same problems I have. The clicking noise is the bone rubbing against bone (cartilage has worn away) and this causes the pain. Tell the orthopaedic surgeon when you get your appointment.

Thankyou for your reply 

I will mention it when I eventually get to the hospital 

I get the injextions in my knees n they do not help anymore. This particular dr said theres no surgery to make it better, just therapy n exercise.. Is this true? Do we really have to live in pain like this?

What did he say was the problem with your knees?? With the OA I have basically it's full knee replacement on both but I'm still to young.