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ACL injury - Symptoms and causes - Mayo Clinic
Cruciate Definition & Meaning - Merriam-Webster
Cruciate ligament - Wikipedia
Anterior Cruciate Ligament (ACL) Injuries - OrthoInfo - AAOS
ACL injury: Symptoms, treatment, and recovery - Medical News Today
ACL Tear & Injury: Symptoms & Recovery - Cleveland Clinic
Anterior Cruciate Ligament (ACL) Injury or Tear
Posterior Cruciate Ligament Injuries - OrthoInfo - AAOS
Anterior cruciate ligament - Wikipedia
Knee Ligaments: Anatomy, ACL, MCL, PCL, LCL, Torn Ligament