What is the primary reason for the increased incidence of diaphragmatic injury on the left side?

The primary reason for the increased incidence of diaphragmatic injury on the left side is the protection offered by the liver on the right. The liver, being a large and solid organ, provides a barrier that absorbs impact and trauma that might otherwise affect the diaphragm. This anatomical arrangement means that when trauma occurs, such as from a blunt force or penetrating injury, the right diaphragm is more shielded, leading to a higher frequency of injuries occurring on the left side.

Additionally, the left diaphragm does not have a comparably large organ providing such protection, making it more susceptible to injury during traumatic events. Understanding this anatomical context helps clarify why diaphragmatic injuries are predominantly observed on the left side, emphasizing the role of surrounding structures in trauma scenarios.