“…Vascular injuries within the knee joint can also result in recurrent hemarthrosis. These include injuries to the superior and inferior lateral geniculate arteries, bleeding from arterial branches of the knee, arterio-arterial, or arterio-venous fistulae, pseudoaneurysms, or erosion of the femoral component through a hypertrophied atherosclerotic artery [ [11] , [12] , [13] , [14] ]. Risk factors for vascular malformations include previous complex surgeries, soft-tissue compromise, vascular diseases, and medical factors such as atherosclerosis, hypertension, and diabetes mellitus.…”