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The transverse abdominal island flap is not just another myocutaneous flap. Although it derives its blood supply from myocutaneous perforators, the portion of the skin and fat that overlies muscle comprises only about 20% of its surface. The surface area of the flap by far exceeds the surface area of the entire muscle that carries it. Its hemodynamics are more complicated than usual and consist of delicate communications between the superior and inferior deep epigastric systems and the deep and superficial epigastric systems across the midline. Its use in breast reconstruction has been as exciting as it is complex. We describe our experience with 60 consecutive patients and 65 transverse abdominal island flaps.
Scheflan et al. (1983) studied this question.