The radiographic relationship of the femoral head, inguinal ligament, and common femoral artery bifurcation for optimal vascular access.

Significant variability exists in the relationship between the inguinal ligament, CFA bifurcation, and the femoral head, suggesting the lack of a consistently safe access zone. The safest access zone in >80% of patients lies below the radiographic midpoint of the femoral head and the inferior aspect of the femoral head.