Which structure is most vulnerable to laceration when the femur is fractured, the broken distal end often turns posteriorly to enter the popliteal fossa due to muscle traction because of its position deepest in the fossa?

Popliteal a.-the popliteal fossa contains the popliteal artery, popliteal vein, common fibular nerve, and tibial nerve. the popliteal artery is the deepest structure in the fossa-it lies on the posterior side of the knee joint. so, it is the structure that would be most likely to be lacerated by the broken distal end of the femur. the popliteal vein lies superficial to the artery, and the tibial nerve lies superficial to the popliteal vein. these three structures are right in the middle of the fossa. the common fibular nerve descends toward the fibular neck, on the lateral side of the popliteal fossa. the lesser saphenous vein drains the superficial posterolateral lower limb. it eventually terminates in the popliteal vein