Which rib fractures are commonly associated with renal injury?

• A. 5th and 6th ribs
• B. 9th and 10th ribs
• C. 11th and 12th ribs
• D. 7th and 8th ribs

Answer: (C)

Rib fractures in the lower part of the rib cage, specifically the 11th and 12th ribs, are closely associated with renal injuries. This is due to their anatomical location; the kidneys are situated in the retroperitoneal space, and the lower ribs provide some degree of protection to this area. In cases of trauma, particularly when there is a blunt force impact, fractures of these lower ribs can lead to lacerations or contusions of the kidneys.

The renal vessels and renal parenchyma are at risk from fracture fragments or from the force applied during the trauma that caused the rib fractures. Since the 11th and 12th ribs are the lowest ribs, they have the closest relationship to the kidneys, making injuries to these ribs more likely to be associated with renal injuries compared to fractures of higher ribs.

In contrast, higher rib fractures, such as those of the 7th and 8th ribs or 9th and 10th ribs, may not have the same risk for renal injury due to their further distance from the kidneys. While any rib fracture can theoretically cause injury to adjacent organs depending on the mechanism of injury and the specific trauma, the 11th and 12th ribs are