Anterior cruciate ligament injury

An anterior cruciate ligament injury occurs when the anterior cruciate ligament (ACL) is either stretched, partially torn, or completely torn. The most common injury is a complete tear. Symptoms include pain, an audible cracking sound during injury, instability of the knee, and joint swelling.

Swelling generally appears within a couple of hours.
In approximately 50% of cases, other structures of the knee such as surrounding ligaments, cartilage, or meniscus are damaged.

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Source: Wikipedia · Image: Wikimedia Commons · Public domain

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