Final answer:
The Adult rule of 9's is a method used to assess the percentage of burn surface area on the posterior trunk. It is commonly used in burns and trauma care.
Step-by-step explanation:
The Adult rule of 9's for the Posterior Trunk is a method used to assess the percentage of burn surface area on the posterior (back) side of the body. According to this rule, the posterior trunk accounts for 18% of the total body surface area if the burn is circumferential, meaning it wraps around the body. This rule is commonly used in burns and trauma care to estimate the extent of injury and guide treatment decisions.
For example, if a patient has a circumferential burn on their back, the burn would be estimated to cover approximately 18% of their total body surface area according to the Adult rule of 9's.