What percentage of the body do both the front and back trunk represent in the Rule of 9's?

In the context of the Rule of Nines, each major area of the body is assigned a specific percentage to estimate the extent of burns. The trunk of the body is divided into the front (anterior) and back (posterior) surfaces. According to this system, both the front trunk and the back trunk each represent 18% of the total body surface area.

This means that when assessing a patient with burns, if both the front and back of the trunk are involved, you would total 36% of the body surface area affected by burns (18% for the front and 18% for the back). This method is widely used in emergency medicine to provide a quick and effective way to estimate burn severity and guide treatment decisions. Understanding this concept is crucial for paramedics and other emergency responders, as it assists in prioritizing care and fluid resuscitation for burn patients.