- Bursas are sacks that provide cushioning and lubrication for joints. Bursitis occurs when these sacks become raw and inflamed. Bursas are located over bony prominences, with the most common areas of inflammation in the shoulders, elbows, and hips. A special type occurs in the popliteal area (crease area in back of knee) called a Baker's cyst, which forms a large, fluid-filled sack. Baker's cysts sometimes rupture.
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