Knee bursitis (also known as housemaid's knee or clergyman's knee) occurs when one of the many bursae in the knee becomes inflamed, swollen, or irritated. A bursa, which is a fluid-filled sac, acts as ...

Your knee is a complex piece of equipment: Bones, cartilage, ligaments, tendons, and muscles meet at or help to form the knee, and any of these could be involved in knee pain. "There are a number of ...