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  2. Jun 16, 2022 · Overview. A swollen knee occurs when excess fluid collects in or around your knee joint. Health care providers might refer to this condition as an effusion (uh-FU-zhun) in your knee joint. A swollen knee may be the result of trauma, overuse injuries, or an underlying disease or condition.

  3. Jan 25, 2023 · Signs and symptoms that sometimes accompany knee pain include: Swelling and stiffness. Redness and warmth to the touch. Weakness or instability. Popping or crunching noises. Inability to fully straighten the knee.

  4. Traumatic knee swelling usually means you’ve experienced an injury. Sports injuries are the most common causes of knee swelling, including: ACL tears. MCL tears. Meniscus tears. Hyperextended knees. Sprains. Bone fractures. Dislocations. Patellofemoral pain syndrome (PFPS). Non-traumatic knee swelling is usually caused by arthritis.

  5. Jan 24, 2021 · One of the most common symptoms you may experience in your knee is swelling. Also known as effusion, this condition occurs when there is a buildup of fluid within the joint that causes the knee to look bloated or puffy.

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