Popliteal angiogram is usually obtained as part of the femoral angiogram by panning the table downwards to cover the popliteal artery as the contrast flows down from the femoral artery. Femoral angiogram can be either obtained by an antegrade puncture of the ipsilateral femoral artery and introducing the sheath downwards in an antegrade fashion or by a catheter introduced through a conventional retrograde puncture of the contralateral femoral artery. In the latter case, the catheter traverses the contralateral iliac artery to the aortic bifurcation and then down the ipsilateral iliac artery into the femoral artery. This method is used when the ipsilateral puncture is technically difficult. Usually the popliteal artery divides into anterior and posterior tibial branches and the posterior tibial gives off a peroneal branch. Anterior tibial artery becomes the dorsalis pedis artery as it crosses the ankle joint. Posterior tibial artery is palpable posterior to the the medial malleolus.