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

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.