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Anterior Cruciate Ligament (ACL) injury is one of the most common and clinically significant ligamentous injuries of the knee, especially among athletes. It can range from a sprain (partial tear) to a complete rupture.

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https://youtu.be/OJf-EU-VzgM

https://youtu.be/3RDatz78X6Y

https://www.youtube.com/watch?v=Z0YPbLYQ8c4

https://www.youtube.com/watch?v=7SJ4uDhVNiA

Mechanism of Injury

• Typically non-contact pivoting injury:
  • Sudden deceleration, cutting, or landing from a jump with valgus stress and external rotation.
• Contact injuries: Direct blow to the lateral knee with the foot planted.

Clinical Presentation

• Sudden “pop” at time of injury.
• Immediate pain and knee instability (“giving way”).
• Rapid swelling due to hemarthrosis.
• Positive Lachman, anterior drawer, and pivot shift tests.

Radiology

The Radiology Assistant : Non-Meniscal pathology

https://www.youtube.com/watch?v=4L28fCa9KpM