peroneal

Etymology
From or.

Adjective

 * 1)  Pertaining to the fibula or to the part of the leg containing it, the outside (lateral aspect) of the lower leg (that is, what anatomical terminology calls the leg, from knee to foot).

Usage notes
Do not confuse ("of the outside of the lower leg") with  ("of the skin between the genitals and anus"); the words sound almost alike or even entirely alike, depending on the variable quality of a single.