According to the Rule of 9's, what percentage of the body surface area does the posterior torso of a child account for?

The correct understanding of the Rule of 9's highlights that in children, the distribution of body surface area is different from that of adults. Specifically, the posterior torso for a child accounts for 18% of total body surface area. This is determined by dividing the body into sections where the head and neck accounted for about 9%, each arm for 9%, each leg for 14%, and the anterior and posterior torso each representing 18%.

In the case of the posterior torso, it's important to recognize that it includes both the back and the buttocks, thus justifying the 18% allocation. This method is particularly useful in estimating the severity of burns and determining fluid resuscitation needs. Understanding the distinctions in body surface area percentages between children and adults is vital for accurate treatment decisions in emergency situations.