Knee feeling funny?

I tore my MCL and partially my ACL on my right knee two years ago and had to wear a brace and all that junk for a while, and it had been feelin fine up until now.... It's not a really *BIG* pain, but i do feel this slight pain if i'm on my knees or anything, its kinda feels like my knee cap is sliding to the right or something, and whenever i walk it feels funny. Like me knee can't fully lock, when i kick with my left knee i can feel it lock, but i don't feel it on my right... it moves all the way, but i don't get that "lock" feeling if that makes sense. And i don't remember doing anything to agitate my knee. Does anybody know what the problem could be?