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What’s Causing Pain in the Back of My Knee?

Baker’s Cyst

A Baker’s cyst is a knee condition that occurs due to a fluid-filled sac that forms in the knee joint. The clear fluid inside the sac is synovial fluid – normally present in the joints and acts as a lubricant to allow smooth movement of the two bones forming the joint. However, if you have a knee injury or arthritis, your knee may start producing too much synovial fluid that may later accumulate and form a cyst. The common symptoms of the Baker’s cyst include:

  • Stiffness and trouble flexing your knee
  • Swelling behind your knee
  • Pain in and behind your knee

If left untreated or when you are inactive, these symptoms can get worse. If the cyst bursts and cause leakage of the synovial fluid, you will feel excruciating pain in your knee.

Sometimes, it goes away on its own. To treat a painful or ruptured cyst, you may need medications, steroid injections, physical therapy, or surgical drainage of the cyst. Before getting treatment, it’s important to determine the underlying problem of the cyst, such as a knee injury or arthritis. If so, managing this problem first may cause automatic clearing up of the cyst.

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