ACL Tear
The anterior cruciate ligament is one of two, thick internal ligaments (the other is the posterior cruciate ligament- PCL) that stabilize your knee internally, limiting forward and rearward movement of the femur relative to the tibia.
A strong shearing force can cause it to tear, or snap in half altogether. Afterwards, there will be pain and noticeable knee instability.
NEXT: Collateral Ligament Tear or Strain
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