The vascularization of the skin paddle of 20 osteocutaneous fibula free flaps in 20 patients was studied. All skin paddles were designed over the proximal and middle third of the fibula. A parallel vascularization of the skin was found in 10 cases. In these cases, an axial (septo)musculocutaneous perforator was found to originate high in the peroneal artery or even in the popliteal artery. This branch runs parallel to the peroneal artery without any further connections with it. In 5 of these 10 cases, no other skin perforators were located within the boundaries of the skin paddle. Harvesting such a flap in the traditional way by blind inclusion of a muscle cuff results in ligation of the supplying vessel of the skin paddle and subsequent loss of the skin. In this series, this would have been the case in 5 of the 20 patients (25 percent). This might explain the bad reputation of the skin paddle of this flap. The high prevalence of the described vascular configuration in a proximally designed skin paddle justifies à vue dissection of all musculocutaneous perforators up to their origin, unless one or more septocutaneous perforators are found within the boundaries of the flap.
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