According to the rule of 9's, the adult patient's leg represents how much of the total body surface area?

In the assessment of burn injuries, the Rule of Nines is a standardized method used to estimate the total body surface area (TBSA) affected by burns. For adults, each leg (including the front and back) accounts for 18% of the total body surface area. This is because the entire body is divided into sections, with each section representing a percentage of the total.

In the case of the leg specifically, the front (anterior side) is allocated 9% and the back (posterior side) another 9%, totaling 18%. This approach allows medical professionals to quickly estimate the extent of burns, which is crucial for determining treatment and fluid resuscitation needs. Therefore, choosing 18% accurately reflects the percentage of TBSA represented by both legs combined.