The blood flow to the foot is from three arteries in the lower leg (the anterior tibial artery, the posterior tibial artery and the peroneal artery) that extend downward and distribute to different areas of the foot. Usually the anterior tibial artery extends forward and downward as the dorsalis pedis artery, which distributes to the back of the foot; the posterior tibial artery extends backward and downward as the plantar artery, which branches into the medial plantar artery and the lateral plantar artery, which distribute blood flow to the medial and lateral parts of the foot; and the peroneal artery ends at the ankle, with only a few branches involved in the blood supply to the heel. When an ulcer develops in an area of the foot, the artery supplying the ulcer area should be opened in a targeted manner. If the targeting is not strong, the blood supply to the ulcer area will be compromised, and the medicine and nutrition coming with the blood circulation will be limited, and the healing of the ulcer will be delayed or not healed.