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Fig. 1A —Classification of popliteal artery branching. PT = posterior tibial artery, PR = peroneal artery, AT = anterior tibial artery. (Reprinted with permission from Kim D, Orron DE, Skillman JJ. Surgical significance of popliteal artery variants: a unified angiographic classification. Ann Surg 1989; 210:776–781 [12]) Type I-A: Usual pattern of popliteal arterial branching and arterial supply to foot. Type I-B: Trifurcations: anterior, peroneal, and posterior tibial arteries arise at same point without intervening tibioperoneal trunk. Type I-C: Posterior tibial artery is first branch. Anterior tibial and peroneal arteries arise from common trunk.