is it arthritis or something?
i have joint hyperflexia (basically i can bend my knees and my fingers and elbows a lot further than i'm supposed to). the specialist i was sent to for it told me that my ligaments are too flexible and don't hold my joints in place properly, so running and walking will put my joints out of place if i'm not careful. a few weeks ago i nearly dislocated a knee just by standing up. it didn't really hurt, it was just very uncomfortable to feel my knee slip out of place and go sideways at a very wrong angle.
however, arthritis medicine usually helps to reduce the pain. but when it doesn't work i'm pretty much screwed because pain medicine barely affects me. so i kind of just carry a knee brace with me wherever i go, try not to make my knees pop too loudly because of my kneecaps shifting, and limp pretty much all the time because of my hips. it sucks but i'm used to it mostly.