This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pelvis and Hip injuries, Subject name: Orthopaedics
A 45-year-old driver is involved in a motor vehicle collision and sustains a pos terior dislocation of the left hip. What is the most likely concomitant injury 
Select and explain. 
A. Right knee meniscus tear, B. Left knee anterior cruciate ligament tear, C. Subdural hematoma, D. Lumbar burst fracture
B: Left knee anterior cruciate ligament tear
Answer: B: Left knee anterior cruciate ligament tear 
Explanation: The traumatic hip dislocation in this case is due to a dashboard injury in which the forces are fi rst transmitted through the knee en route to the hip. Thus the possibility of a concurrent ipsilateral knee injury should be explored through careful clinical examination and possibly magnetic resonance imaging.