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Definition

An anterior cruciate ligament injury is the over-stretching or tearing of the anterior cruciate ligament (ACL) in the knee. A tear may be partial or complete.

Symptoms

Early symptoms:

* A "popping" sound at the time of injury
* Knee swelling within 6 hours of injury
* Pain, especially when you try to put weight on the injured leg

Those who have only a mild injury may notice that the knee feels unstable or seems to "give way" when using it.

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