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What is an Anterior Cruciate Ligament Injury

An anterior cruciate ligament (ACL) injury is a tear in the ACL ligament. The ACL is located in the middle of the knee joint and connects the lower leg bone to the thigh bone and prevents the leg bone from sliding too far forward at the knee, which would cause instability. Most ACL tears occur during non-contact injuries, such as pivoting or making a sudden stop.

When the ACL tears, you may hear a popping sound. When you stand, the knee will probably give-way immediately, and it will be difficult to walk on the affected leg. Treatment for an ACL injury includes wearing a knee brace, surgery and physical therapy.

Reference for Anterior Cruciate Ligament Article

National Institutes of Health

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