RESUMEN
<p><b>OBJECTIVE</b>To discuss the therapeutic effect and clinical experience of a new technique of digital reconstruction with the free mesio-forearm flap based on perforator of ulnar artery.</p><p><b>METHODS</b>We marked the line from the pisiformis to the condylus medialis humeri as the axis of the flap. We used Doppler to detect the site of the mesio-forearm ulnar perforator which is usually 9-10 cm proximal to the condylus medialis humeri as center of the flap. We designed the flap that contained perforator artery with its accompanying vein of the ulnar artery and a superficial vein around the center spot along the axis of ulnar artery. The wound at donor site was sutured directly. Neurorrhaphy was not conducted in any cases.</p><p><b>RESULTS</b>From June 2005 to June 2009, all 12 flaps survived with good quality and aesthetic contour. And no necrosis occurred. We conducted 6-36 months follow-up, and the result was satisfactory. The function of the fingers was reserved. Two-point discrimination differed from 6 cm to 12 cm.</p><p><b>CONCLUSIONS</b>The free ulnar perforator flap on mesio-forearm can repair digital defect with good therapeutic effect, leaving less morbidity at donor site.</p>