The medial sural artery perforators: anatomic basis for a surgical plan.

We performed an anatomic study on 20 fresh lower limbs. Resin was injected in the popliteal artery. Medial sural artery perforator flaps were sculptured according to anatomic markings. On average, length of flaps was 12.9 cm, width was 7.9 cm; all 38 perforators were musculocutaneous: 1 perforator was always found (on average, 1.9 per flap). All perforators gathered between 7 and 18 cm from the popliteal crease; 34.2% of perforators arose on the midline of the medial head of gastrocnemius muscle; before entering the fascia, the perforator artery diameter was on average 0.5 mm. Two configurations of the intramuscular course of perforators were found. Sixty-six percent of perforators originated from the lateral branch of the medial sural artery, 34% from the medial one. These results improve the anatomic knowledge of the medial posterior calf region and allow us to describe a convenient plan to make flap sculpturing easier.