If you have a large aneurysm in the popliteal artery, it is at risk for thrombosing (clogging off) or embolizing (tossing debris), and puts you at risk for losing your leg.
Larger aneurysms can also compress local structures and cause blood clots in your vein, or pain from pressure on the nerve
. It is also possible for the aneurysm to rupture
, but this is more common in aortic aneurysm