What causes fluid accumulation in the knee joint?

Nov 29, 2024 Source: Cainiu Health
Dr. Chen Jian
Introduction
Knee joint effusion may be caused by factors such as aging, sports injuries, meniscus injury, joint infection, or gouty arthritis. With aging, the cartilage in the knee joint gradually wears away, and the amount of synovial fluid within the joint may increase in compensation for the loss of cartilage. Engaging in moderate, low-impact exercises such as swimming or cycling is recommended.

Generally, knee joint effusion may be caused by factors such as aging, sports injuries, meniscus damage, joint infections, or gouty arthritis. If discomfort occurs, timely medical consultation is recommended. Detailed explanations are as follows:

1. Aging

With aging, the cartilage in the knee joint gradually wears away, and the amount of lubricating fluid within the joint may increase to compensate for the loss of cartilage. Engaging in moderate, low-impact exercises such as swimming or cycling can help strengthen the muscles around the joint and reduce joint strain.

2. Sports Injury

Following a sports injury, the synovial tissue within the knee joint becomes stimulated, releasing inflammatory mediators that promote the production of synovial fluid to protect and repair damaged joint tissues. Rest, ice application, compression bandaging, and elevating the affected limb are key initial management steps.

3. Meniscus Injury

After meniscal tear or wear, joint stability is compromised, triggering an inflammatory response that stimulates the synovial tissue to produce more synovial fluid to meet the protective demands following joint injury. Symptoms such as knee pain and clicking may occur. Patients can take medications such as glucosamine sulfate capsules, ibuprofen sustained-release capsules, and Tongluo Qutong plasters under the guidance of a specialist physician.

4. Joint Infection

Knee joint infections can be caused by microorganisms such as bacteria or viruses, leading to an inflammatory response within the joint. This inflammation stimulates the synovial membrane to secrete large amounts of joint fluid, potentially accompanied by pus formation, resulting in effusion, and may present with symptoms such as fever and chills. It is recommended to follow medical advice regarding treatment with medications such as cefixime granules, amoxicillin capsules, or azithromycin capsules.

5. Gouty Arthritis

Gouty arthritis is an inflammatory condition caused by abnormal uric acid metabolism, resulting in the deposition of urate crystals within the joint. This inflammation stimulates the synovial membrane to secrete excessive joint fluid, which may lead to symptoms such as redness, swelling, heat, and pain. Patients should follow medical advice to take medications such as prednisone acetate tablets, febuxostat tablets, or indomethacin capsules for treatment.

It is recommended to avoid chilling of the knee joint. Wearing knee protectors or taking other warming measures can help maintain normal joint temperature.

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