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What causes swelling in the knee?

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This article describes 12 conditions that frequently cause knee swelling, or water on the knee. Included are the most common causes of knee swelling, such as injuries, osteoarthritis, and bursitis, as well as less common causes, such as Baker's cysts and reactive arthritis. read more

A swollen knee (knee effusion) is a common problem occurring in both young and old. Learn the various causes of knee swelling and how they are diagnosed. A swollen knee (knee effusion) is a common problem occurring in both young and old. read more

Obesity increases your risk of osteoarthritis, one of the more frequent causes of knee swelling. Complications. Complications of a swollen knee can include: Muscle loss. Fluid in the knee can harm the working of your muscles and cause thigh muscles to weaken and atrophy. Fluid-filled sac (Baker's cyst). read more

More Causes of a Swollen Knee (Water on the Knee) When to Contact a Doctor If the cause of the swollen knee is uncertain, a doctor may want to draw fluid from the joint, a process called arthrocentesis or joint aspiration, or order imaging studies, such as X-rays or an MRI. read more

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