In the classification of flaps for reconstructive surgery, a perforator flap harvests skin and subcutaneous tissue based on which vascular principle, and what is the reconstructive advantage over a myocutaneous flap?

• A Perforator flap is based on direct cutaneous arteries that do not pass through muscle; used when muscle is required for dead-space obliteration
• B Perforator flap is based on perforating vessels that pass through or between muscles to supply the overlying skin; advantage is that the muscle is preserved, reducing donor site morbidity ✓
• C Perforator flap includes muscle cuff to protect the perforating vessel; identical donor site morbidity to myocutaneous flap
• D Perforator flap is an axial pattern flap with a named artery running in the subcutaneous tissue throughout; no muscle sacrifice is the advantage

Explanation

Perforator flaps (e.g., DIEP, TRAM perforator, ALT) are based on vessels that perforate the deep fascia and pass through or between muscles (musculocutaneous or septocutaneous perforators) to reach the skin. The key advantage over myocutaneous flaps is muscle preservation — the muscle is not harvested, dramatically reducing donor site morbidity (hernia, functional deficit, pain). The DIEP (deep inferior epigastric perforator) flap for breast reconstruction preserves the entire rectus abdominis muscle compared to TRAM flap. Dissection of the perforator through the muscle is technically more demanding.

Reference: Bailey & Love's Short Practice of Surgery, 27th ed.

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Written and medically reviewed by the StethoPrep medical team.