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Fluid on the knee is the general term for any excess liquid on the knees and the areas surrounding the knees. Fluid causes swelling and/or pain and affects mobility. Causes of fluid on the knees include injury, overuse and illness.
Fractures
Knee fractures cause fluid on the knee, leading to pain, swelling and tenderness. Fractures occur from falling, sports injuries and blunt trauma.
Tendon Bursitis
Knee tendon bursitis causes fluid buildup below the knee cap, leading to pain and walking difficulty. The American Academy of Orthopaedic Surgeons says athletes and osteoarthritis sufferers are susceptible to bursitis.
Gout
Gout, commonly associated with foot pain, affects knee joints. MedlinePlus Medical Encyclopedia says fluid on the knee occurs from excess uric acid buildup from eating too many prurine-containing foods.
Baker's Cyst
Baker's cysts are fluid buildups behind the knees caused by herniated knee joint capsules. MedlinePlus says cysts feel like water balloons and, if they rupture, cause swelling, bruising and pain.
Treatment Options
Treatment for fluid on the knee depends on the cause. In general, doctors recommend rest, elevation, anti-inflammatory and pain medications, fluid drainage and surgery in severe cases.
Source:
University of Michigan Health System: Broken Knee (Knee Fracture)
American Academy of Orthopaedic Surgeons: Knee Tendon Bursitis
MedlinePlus Medical Encyclopedia: Gout
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