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 ...
If you experience knee pain after sitting with your legs bent, it may be caused by arthritis, tendonitis, bursitis, or patellofemoral pain. If your knees hurt when sitting, it may be from sitting in ...