PAP Flap Breast Reconstruction: The Thigh-Based Option

Written by Brian P. Kelley, MD, Dual Board-Certified Plastic & Hand Surgeon
Fellowship-trained in hand and microsurgery, University of Michigan
Affiliate Faculty, Dell Medical School at The University of Texas at Austin
Partner, Seton Ascension Institute for Reconstructive Plastic and Hand Surgery, Austin, Texas
‍Medically reviewed: September 14, 2026 · Last updated: September 14, 2026
Educational content. Not a substitute for individualized medical evaluation.

‍

Introduction

When a patient wants breast reconstruction using her own tissue, the lower abdomen is the usual first choice. But a substantial number of women are not candidates for an abdominal flap. Some are thin and do not have enough lower abdominal tissue. Some have had prior abdominal surgery that divided the necessary blood vessels. Some have already used the abdomen for a previous reconstruction.

For these patients, the upper thigh offers a genuine alternative. The PAP flap, short for profunda artery perforator flap, uses skin and fat from the upper inner and posterior thigh to rebuild the breast. It was first applied to breast reconstruction in 2010 and has since become the leading thigh-based option.¹

This post explains what the PAP flap is, who it suits, how much volume it can provide, what the donor site involves, and how outcomes compare with abdominal reconstruction. I have included the specific trade-offs, because the thigh donor site behaves differently from the abdomen in ways patients should understand before choosing.

What is a PAP Flap?

The profunda femoris artery runs deep in the thigh and sends small branches, called perforators, out through the muscle to supply the overlying skin and fat of the upper posterior and inner thigh.

A PAP flap captures one or more of those perforators along with an ellipse of thigh skin and fat. The tissue is completely detached, moved to the chest, and its blood vessels are reconnected under the microscope to vessels behind the rib cartilage. Once the blood flow is restored, the tissue becomes a living, permanent part of the reconstructed breast.

The muscle is not taken. Like the DIEP flap in the abdomen, the PAP is a perforator flap, meaning the surgeon dissects the supplying vessel free while leaving the underlying muscle intact.

Who the PAP Flap Suits

Several situations make the thigh the better donor site.

Not enough abdominal tissue. This is the most common reason. Thin patients and patients with a flat lower abdomen often cannot supply enough tissue from the belly to build the breast they want. Published PAP series consistently report patients with a mean body mass index in the normal range, around 24, which reflects exactly this population.^2,3

Prior abdominal surgery. Abdominoplasty, extensive abdominal operations, and certain hernia repairs can divide the perforators a DIEP flap needs. I cover that situation in detail in my post on DIEP flap reconstruction after a tummy tuck.

The abdomen is already used. A patient who had a prior DIEP or TRAM flap cannot use that tissue again. When she needs reconstruction of the other breast, or a revision, the thigh becomes the next option.

Patient preference. Some women simply do not want an abdominal scar, or prefer a scar hidden in the buttock crease to one across the lower abdomen.

How Much Volume the Thigh Provides

This is the central practical difference between the thigh and the abdomen, and it deserves a direct answer.

A PAP flap is smaller than a typical DIEP flap. Across published series, mean flap weights cluster in the range of roughly 250 to 310 grams, with individual flaps reported from about 150 to 455 grams.^2,3 A DIEP flap can often provide considerably more.

In practical terms, the PAP flap suits small to moderate breast reconstruction well. For a patient who wants a larger reconstructed breast, a single PAP flap may not reach the target volume on its own.

Several strategies address this. Fat grafting at a later stage can add volume and refine contour. Both thighs can be used for a bilateral reconstruction. For patients needing substantial volume, stacked flap techniques combine more than one flap for a single breast, and published series of four-flap reconstruction report overall satisfaction similar to bilateral DIEP and bilateral PAP patients.⁴

The Donor Site

The PAP incision sits in the upper thigh, positioned so the resulting scar falls in or near the gluteal fold, the natural crease where the buttock meets the thigh. This position is chosen because clothing and the body's own contour conceal it well.

The thigh is closed directly, which produces a lift effect on the upper thigh similar in principle to a thigh lift. For a bilateral reconstruction using both thighs, this generally maintains symmetry.

Patient-reported data on the donor site are reassuring overall. A matched comparison of PAP and DIEP patients using BREAST-Q-derived questions found no significant difference in length of stay, reoperation rates, flap failure rates, or donor site complications, with similar pain scores and narcotic requirements between the two groups.⁵

The Donor Site Trade-Offs Worth Knowing

The thigh donor site is not identical to the abdomen, and two specific differences are worth stating plainly.

Wound healing at the thigh needs attention. The upper inner thigh is a mobile, moist area under tension when sitting and walking, which makes wound healing problems more common there than at some other donor sites.

One prospective comparison found donor-site wound complications in about 30% of PAP patients compared with about 4% of patients whose flap came from a slightly different thigh location.⁶ Most are minor and heal with wound care, but they are frequent enough that patients should expect the possibility.

Long-term donor site comfort may favor the abdomen. In a series of patients who had both abdominal and thigh donor sites used, subjective survey data showed more long-term donor site pain at the thigh, a patient preference for the abdominal donor site, and easier postoperative care for the abdomen.⁴ This does not argue against the PAP flap for a patient who has no abdominal option, but it is relevant for a patient choosing between the two.

Outcomes and Patient-Reported Data

The flap itself performs reliably. A systematic review and meta-analysis pooling 12 studies and 516 PAP flaps found a surgical success rate of 99%, with an overall complication rate of 23%.¹

A large single-center prospective series of 116 consecutive PAP flaps reported no arterial or venous thrombosis and no flap losses, with donor site hematoma in 1.7%, seroma in 2.6%, fat necrosis in 1.7%, and wound dehiscence in 2.6%.²

The patient-reported outcomes are favorable. That same series collected BREAST-Q scores before surgery and at twelve months, and found high satisfaction across all BREAST-Q domains, with postoperative scores higher than preoperative ones and a statistically significant improvement in satisfaction with the breast.²

A matched cohort study comparing long-term quality of life after DIEP versus PAP reconstruction found no significant differences between the two groups in physical well-being of the donor site, physical well-being of the chest, or satisfaction with the breast.⁷ For a patient who cannot use her abdomen, this is the reassuring finding: the thigh route reaches a comparable destination.

PAP Compared With Other Thigh Flaps

The thigh supports more than one flap design, and the distinctions matter.

The TUG flap (transverse upper gracilis), also called the TMG flap, takes tissue from the inner thigh along with a portion of the gracilis muscle. It is technically faster to harvest because the muscle carries the blood supply, so no perforator dissection is required.

The PAP flap sits more posteriorly and spares the muscle. A systematic review comparing the two found similar overall success rates, but significantly fewer vascular complications with the PAP flap (0.6% versus 5.0%) and fewer unplanned early reoperations.⁸ Its more posterior position also keeps the dissection further from the major lymphatic drainage of the leg.

The trade-off runs the other direction on scar satisfaction. In one prospective comparison, patients with the gracilis-based flap were significantly more satisfied with their scar and its position than PAP patients, though both groups reported high overall quality of life and equivalent ability to sit for prolonged periods.⁶

What the Operation Involves

A PAP flap reconstruction is a microsurgical operation. Preoperative imaging, usually CT angiography or Doppler, maps the perforators so the flap can be designed around a suitable vessel.

The surgery typically takes several hours per breast. The flap is raised from the thigh, the vessels are divided, the tissue is moved to the chest, and the artery and vein are reconnected under the microscope. The flap is then shaped into a breast mound and the thigh is closed.

Most patients stay in the hospital several days. The flap is monitored closely during the first day or two, when a circulation problem is most likely and most salvageable if identified quickly.

Recovery

Recovery has one feature specific to this donor site: sitting. Because the incision sits where the thigh meets the buttock, prolonged sitting and positions that put tension on the closure are limited in the early weeks. Patients are typically advised on positioning and given specific guidance about sitting, stairs, and hip flexion.

Restricted activity generally continues for four to six weeks, with a gradual return to normal walking and exercise after that. Drains are commonly used at the thigh and are removed as output declines.

The reconstructed breast continues to settle over several months. Refinements such as fat grafting for contour, symmetry adjustment, and nipple reconstruction are usually performed later as outpatient procedures once the reconstruction has stabilized.

Risks

The PAP flap carries the general risks of any surgery, including bleeding, infection, and anesthetic complications, plus the risks specific to free tissue transfer.

Flap-related risks include partial or total flap loss if the blood supply fails, which is uncommon given the reported 99% success rate, and fat necrosis, meaning firm areas within the flap where some fat did not survive.

Donor site risks include wound healing problems and dehiscence, which as noted are relatively common at this location, along with seroma, hematoma, scar widening, and thigh contour asymmetry. Sensory changes along the upper posterior thigh are expected because small sensory nerves are divided during the dissection.

Revision surgery is common and often planned, particularly fat grafting to refine breast contour and volume.

Radiation and the Autologous Advantage

For patients who need radiation, or who have already had it, autologous reconstruction generally tolerates a radiated field better than an implant does. My published systematic reviews documented elevated complication rates for both implant-based and autologous reconstruction after radiation, with implant reconstruction failure approaching twenty percent in the radiation setting.^9,10

Living tissue can soften and heal in a way an implant cannot, which is part of why many patients facing radiation are guided toward a flap. The PAP flap participates in that advantage. For a patient who needs radiation and has no usable abdominal tissue, the thigh provides a durable autologous option that would otherwise be unavailable.

‍