Perforator mapping and clinical experience with the superthin profunda artery perforator flap for reconstruction in the upper and lower extremities.

[INTRODUCTION] Thin skin flaps have gained popularity for extremity reconstruction. However, the use of the profunda artery perforator (PAP) flap has not been explored as much. With its concealed donor site on the medial thigh and bulk, the PAP has become popular for reconstruction in the breast, head, and neck. The thickness of the subfascial PAP flap is decreased through elevation on the thin or superthin plane, making it more suitable for extremity reconstruction.

[METHODS] A consecutive series of 28 patients with 29 flaps who received a thin or superthin single perforator PAP flap for upper or lower extremity reconstruction was reviewed. Our technique for preoperative localization of the dominant perforator using computed tomography angiography (CTA) and color duplex ultrasonography (CDU) is described.

[RESULTS] Flap success rate was 93.1%. Mean flap artery diameter, vein diameter, area, and thickness were 1.7 + 0.4 mm, 2.2 + 0.4 mm, 157.3 + 52.1 cm, and 0.7 + 0.2 cm, respectively. Skin thickness at the suprafascial bifurcation point of a dominant "T" perforator measured on preoperative CTA correlated with actual intraoperative flap thickness. Patient body mass index did not correlate with flap thickness.

[CONCLUSIONS] The thin and superthin PAP flap has multiple favorable characteristics, making it suitable for extremity reconstruction, and it has become the workhorse skin flap in our institution. Conventional low-frequency CDU together with CTA can be used effectively to map the dominant perforator preoperatively, allowing accurate flap design and rapid flap harvest.

[LEVEL OF EVIDENCE] Therapeutic Level IV.