Knee bursitis, a common problem in athletes, can be difficult to distinguish from other knee problems. A bursa is a fluid-filled sac that provides a cushion and low-friction surface for tendons to glide over, thus protecting the tendon and adjacent structures. Bursitis, an inflammation of a bursa sac, can present in many different ways but can be classified as acute, chronic, or septic. Most of the time, these conditions can be treated conservatively and will do well. If suspected, a septic bursitis needs to be ...

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