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Fig. 1B —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 II-A1: Anterior tibial artery arises above knee joint and has straight course in its proximal segment. Type II-A2: Anterior tibial artery arises above knee joint but takes medial swing, presumably resulting from its passage anterior to popliteus muscle. Type II-B: Posterior tibial artery arises at level of knee joint. Type II-C: Peroneal artery arises above knee joint.