Health Tip: Hear a Pop in Your Knee?

You may have torn an ACL

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(HealthDay News) -- The knee's anterior cruciate ligament (ACL) can be stretched or torn during activities that strain the knee.

A torn ACL may require extensive therapy or surgery to repair it.

Here are primary symptoms of a torn ACL, courtesy of the U.S. National Library of Medicine:

  • A loud popping noise as the knee it hit or twisted.
  • Immediate, severe pain in the knee.
  • Significant swelling of the knee in fewer than six hours after the injury.
  • Difficulty walking or standing, and general weakness of the knee.


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