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]WordNet (r) 3.0 (2006):
popliteal adj 1: of or relating to the area behind the knee joint