The ACL is tissue that connects the thighbone to the shinbone, at the knee. Most ACL injuries occur during certain sports such as basketball, soccer, football, skiing, and tennis.

Symptoms include knee swelling, instability, and pain.

Treatment may include surgery and physical therapy.

A partial or complete tear of a specific ligament in the knee.
  • anterior cruciate ligament injury
  • acl tear
  • anterior cruciate ligament tear

Consult a doctor for medical advice

Sources:  Mayo Clinic and others.


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Cases per year

More than 200,000 US cases per year

Treatable by a medical professional

Requires a medical diagnosis

Lab tests or imaging always required

More common in females

Short-term: resolves within days to weeks

Diagnosis involves physical examination, general test and imaging.

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