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: (A) Right knee meniscus tear, (B) Left knee anterior cruciate ligament tear, (C) Subdural hematoma, (D) Lumbar burst fracture
Answer is B. 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.