The good news for the Nationals and Bryce Harper is that an MRI has revealed that there is no structural issue with Harper's sore left knee. The bad news is that Harper has bursitis in the knee and ...

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 ...

Bursae are fluid-filled sacs in areas of the body that facilitate movement. The knee has several bursae and conditions such as bursitis can impact the bursa in the knee. The body’s musculoskeletal ...