Anterior cruciate ligament injury - Wikipedia
https://en.wikipedia.org/wiki/Anterior_cruciate_ligament_injury
WEBAn anterior cruciate ligament injury occurs when the anterior cruciate ligament (ACL) is either stretched, partially torn, or completely torn. [1] . The most common injury is a complete tear. [1] . Symptoms include pain, an audible cracking sound during injury, instability of the knee, and joint swelling. [1] .
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