This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bones Joints and Ligaments, Subject name: Anatomy
ACL prevents: 
Select and explain. 
A. Anterior dislocation of femur, B. Posterior dislocation of tibia, C. Lateral dislocation of tibia, D. Posterior dislocation of femur
D: Posterior dislocation of femur
Answer: D: Posterior dislocation of femur 
Explanation: Anterior cruciate ligament (ACL) prevents posterior displacement of femur(PDF) on tibia and the anterior displacement of tibia on femur, as well. Posterior cruciate ligament- prevent anterior displacement of femur on tibia and the posterior displacement of tibia on femur, as well.