Knee Tip: Click an image to enlarge it. Click or hover over an enlarged image to show / hide the caption. Normal Knee (Anterior View)Knee EffusionBaker's (Popliteal) Cyst (Posterior View)Baker's (Popliteal) Cyst (Lateral View)Normal View (Lateral View)Prepatellar Bursitis Demonstration of “Bulge” Sign for a Small Knee Effusion (Video)