As per ‘Rule of Nine’, each lower limb accounts for how much % of total body surface area:
## **Core Concept**
The "Rule of Nines" is a method used to estimate the size of a burn injury, which is crucial for determining the severity of the burn and the required treatment. This rule divides the body into sections, each representing 9% of the body's surface area. It is a quick and effective way to assess burn injuries.
## **Why the Correct Answer is Right**
According to the Rule of Nines, each lower limb (or leg) accounts for 18% of the total body surface area. This rule was developed to provide a simple and standardized way to estimate the extent of burn injuries. The distribution is as follows: head and neck (9%), each arm (9%), front of torso (18%), back of torso (18%), each leg (18%), and the genital area (1%). Therefore, the correct answer reflecting the percentage for each lower limb is 18%.
## **Why Each Wrong Option is Incorrect**
- **Option A:** 9% - This is incorrect because 9% corresponds to the head and neck or a single arm, not a lower limb.
- **Option B:** 14% - This is not a value used in the Rule of Nines for any body part.
- **Option D:** 27% - This is incorrect as it does not correspond to any section as per the Rule of Nines.
## **Clinical Pearl / High-Yield Fact**
A key point to remember is that the Rule of Nines can be adjusted for children because their body proportions differ from those of adults. For children, the Lund-Browder chart is often used for more accurate estimation. However, for quick assessments in adults, remembering that each leg accounts for 18% of the body surface area can be lifesaving.
## **Correct Answer:** . 18%