Which structure primarily limits anterior translation of the tibia on the femur?

Which structure primarily limits anterior translation of the tibia on the femur?

• A. Posterior Cruciate Ligament
• B. Lateral Collateral Ligament
• C. Medial Collateral Ligament
• D. Anterior Cruciate Ligament

Answer: (D)

The key idea is which ligament mainly resists the tibia moving forward relative to the femur. The anterior cruciate ligament is the primary restraint to anterior tibial translation. It tightens when the tibia tends to slide forward, preventing that forward movement and helping stabilize the knee during many common activities. The posterior cruciate ligament does the opposite, limiting backward (posterior) translation of the tibia. The collateral ligaments (lateral and medial) mainly resist forces pushing the knee side to side (varus/valgus) and contribute to overall stability, but they are not the main brakes on forward tibial movement. So the structure that primarily limits anterior translation is the ACL.

The key idea is which ligament mainly resists the tibia moving forward relative to the femur. The anterior cruciate ligament is the primary restraint to anterior tibial translation. It tightens when the tibia tends to slide forward, preventing that forward movement and helping stabilize the knee during many common activities. The posterior cruciate ligament does the opposite, limiting backward (posterior) translation of the tibia. The collateral ligaments (lateral and medial) mainly resist forces pushing the knee side to side (varus/valgus) and contribute to overall stability, but they are not the main brakes on forward tibial movement. So the structure that primarily limits anterior translation is the ACL.