What causes popping and cracking grinding in the knee?!

What causes popping and cracking grinding in the knee?

I have trouble with my right knee popping and grinding. If i put my hand on my knee I can actually feel the grinding when i bend and straighten my knee. Sometimes it really starts hurting but other times it doesnt hurt at all. But I always feel the grinding a popping. Anybody have any ideas what could be causing this?? Also my mother just had surgery on her knee for pretty much the same thing. Is this a hereditary thing?? Just wondering!

6 days ago
By way I just turned 40. I also have been taking osteo bi-flex and using arthritus stuff called Activon and neither seems to be helping much if at all.

I dont know about popping at all, but my knee sort of "creaks" if that makes sense, which might be similar to your grinding. In my case, its a tendon issue- which a doctor explained to me. I'd say go see a doctor, and they can help you get around it (Ive got exercises and ice to relieve my problem, but aggravating it can cause cartillage damage that could take surgery). A doctor can tell you whats going on and if there are ways to avoid surgery, or if its nessecary like for your mom.
Best wishes!