popliteal

from WordNet (r) 3.0 (2006)

popliteal
    adj 1: of or relating to the area behind the knee joint

from The Collaborative International Dictionary of English v.0.48

Popliteal \Pop*lit"e*al\ (?; 277), a. [From L. poples, -itis,
   the ham.] (Anat.)
   Of or pertaining to the ham; in the region of the ham, or
   behind the knee joint; as, the popliteal space.
   [1913 Webster]