Knee effusion

Knee effusion
Other namesSwelling of the knee, water on the knee
Traumatic effusion of the right knee, with swelling lateral to the kneecap marked by an arrow
PreventionMaintaining a healthy weight

Strengthening muscles

Limit excessive use

Low impact activities

Knee effusion, informally known as water on the knee, occurs when excess synovial fluid accumulates in or around the knee joint. It has many common causes, including arthritis, injury to the ligaments or meniscus, or fluid collecting in the bursa, a condition known as prepatellar bursitis.

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