Relating to the popliteal area, ie the recess at the back of the knee.

The region at the back of the knee is called the popliteal fossa, and has some complicated anatomy.
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CLINICAL PUBLICATIONS
Uncommon Diseases of The Popliteal Artery: A Pictorial Review. Jarraya M, Simmons S, Farber A, Teytelboym O, Naggara N and Guermazi A. Insights Imaging. 2016 Oct; 7(5): 679–688.