Which of the following statements about the anterior cruciate ligament (ACL) is true?
A. A varus stress to the medial side of the knee tears the ACL in the Unhappy Triad
B. It is a primary restraint to anterior translation of the tibia on the femur
C. It is truly isometric throughout the range of motion of the knee
D. The ACL is extra-articular
E. To test it, the knee is placed in full extension
Answer: B
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Biomechanics
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