LAP Flap Breast Reconstruction

The Lumbar Artery Perforator flap (LAP flap) rebuilds the breast using skin and fat borrowed from the lower back. The tissue is lifted with its own small blood vessels, moved to the chest, and reattached under a microscope to vessels at the mastectomy site.

The blood vessels supplying this tissue travel close to the spine. To avoid dissecting near important nerves, those vessels are deliberately kept short. That means a short additional length of blood vessel is needed. That length most often comes from the lower abdomen, through a small separate incision similar to a C-section. Other sources are available when needed.

Like the other flap operations, a LAP flap can improve the contour of the area the tissue is taken from — in this case the flanks and lower back. In some patients there is also the illusion of a buttock lift.

• It is permanent. The reconstruction is built from your own living tissue, so once it has healed it is simply part of you — there is nothing to exchange or replace later.
• It looks and feels natural. The reconstructed breast has the softness and movement of the tissue it is made from, and it typically blends into the chest rather than sitting on it.
• It is living tissue with its own blood supply. That means it stays at body temperature — it does not turn cold when the weather does, the way an implant can.
• It changes with you. Gain weight and the reconstruction gains with you; lose weight and it does the same. It follows your body over time instead of staying fixed.
• It stays fat — it never becomes breast tissue. The tissue that is moved is skin and fat, and it remains skin and fat, so it does not change your risk of breast cancer.

These advantages are shared by every natural-tissue reconstruction Dr. Haddock performs — DIEP, PAP, and LAP alike. Which donor site is right for you is a separate question, decided together after examination and imaging.

• The donor site gives a contour improvement to the flanks and lower back, and in some patients the illusion of a buttock lift.
• The incision sits across the lower back, where it is covered by almost anything you wear.
• It opens a donor site that is independent of the abdomen and the thighs, so previous surgery or previous reconstruction at those sites does not rule it out.
• When both breasts are being reconstructed, Dr. Haddock often does both sides in a single operation rather than staging them weeks apart — a decision made case by case, based on your anatomy and medical history.
• Like all perforator flaps, it takes only skin and fat — the muscle is left in place and its function preserved.

The tissue is taken from the lower back and flank, and the incision runs across the lower back. It sits low enough that ordinary underwear or a waistband covers it.

The diagram shows the back only. A LAP flap also needs a small separate incision to obtain the extra length of blood vessel described above — most often on the lower abdomen.

The LAP flap is a new and technically demanding operation, and Dr. Haddock and his team are one of only a few groups performing it anywhere in the world. They published the initial experience with simultaneous bilateral LAP flaps — doing both sides in one operation rather than one side at a time — and, to our knowledge, remain the group with the most extensive experience doing it that way. Their 300-flap series is the largest report of LAP flaps in the medical literature.

Dr. Haddock’s approach is built around a few clear goals: superior aesthetic results, limited donor-site morbidity (fewer problems where the tissue is taken), and operative efficiency that leads to a quicker recovery. When you are choosing a surgeon for this operation, experience is the thing that matters most — and Dr. Haddock does not view success as simply flap survival; his goal is to achieve the result each patient wants.

As with any procedure, there are risks associated with natural-tissue (autologous) breast reconstruction. The main adverse outcomes are total or partial flap failure. Total failure — the most feared complication — typically results from a venous or arterial clot in the vessels supplying the flap; with modern technique and in experienced hands, this risk is extremely low. Patients may also experience hematoma, seroma, or wound-healing problems at either the donor or recipient site.

In Dr. Haddock’s series of 300 LAP flaps, the complication rate for non-stacked reconstructions (one flap per breast) fell from 30.2% in 2019 to 8.8% in 2024–25 as the technique was refined — the kind of improvement that only shows up when one team performs the operation often enough to study it.†