I have symptoms of both. At first it was only my left knee, then after a couple of weeks that knee felt better and now a couple of months later my right knee is even more painful. Same symptoms. sweeling, fluid in knee i think. So I’m assuming if I have arthritis it’s in both knees. Tomorrow I will call and schedule an appointment for x-rays probably. Anyone have arthritis in the knee? what’s it like for you? what type do you have?