Arteriovenous fistula with false aneurysm of the inferior medial geniculate artery. A complication of total knee arthroplasty.

Two cases of traumatic arteriovenous fistula with false aneurysm of the inferior medial geniculate artery are reported as a complication of total knee arthroplasty. Both cases were diagnosed within the first two months following the knee surgery. Diagnosis in both cases was confirmed by arteriography. Surgical excision of this lesion with ligation of the inferior medial geniculate artery resolved both of these complications. Strict hemostasis in the region of the inferior medial geniculate artery following subperiosteal release of the medial ligaments in total knee arthroplasty should prevent this complication.