Prepectoral Breast Reconstruction: The Role of Biological Matrix and Fat Grafting

Prepectoral breast reconstruction places a breast implant above the chest muscle rather than beneath it. It has become one of the most important techniques in modern reconstruction because it spares the muscle — but it only works because of two enabling technologies: the biological matrix and fat grafting. This article explains the technique and the role each of these plays.

What is prepectoral breast reconstruction?

“Prepectoral” means “in front of the muscle.” In this approach the surgeon reconstructs the breast by placing the implant in the space where the natural breast tissue used to be — above the pectoralis muscle — often as a direct-to-implant (DTI) procedure in a single stage where suitable.

The alternative, subpectoral reconstruction, places the implant partly under the muscle. That provides natural coverage but disrupts the muscle, which can lead to discomfort and animation deformity: visible movement of the implant when the chest muscle contracts. Prepectoral placement avoids disturbing the muscle altogether.

Why prepectoral placement needs a biological matrix

Placing an implant above the muscle raises an obvious question: what supports and covers it? In subpectoral reconstruction, the muscle does part of that job. In prepectoral reconstruction, the answer is a biological matrix.

The matrix wraps or slings the implant, giving it a defined, supported pocket and reinforcing the soft tissue over it. Because the implant sits closer to the skin, the quality of that support matters a great deal — the matrix needs enough strength to hold the implant in position and enough biological compatibility to integrate with the surrounding tissue. This is why robust, well-integrating matrices are so central to the technique.

Why tissue source matters here

The mechanical demands of prepectoral placement make the matrix material especially important. A matrix derived from bovine pericardium — strong, organised collagen — is well suited to this role. Advanced Biomedical Concept’s ExaShape is a pericardium-derived bilayer membrane designed both to support the implant and to encourage the body to repopulate and revascularise the scaffold.

Why fat grafting completes the picture

With the implant in front of the muscle and closer to the skin, soft-tissue coverage becomes critical for a natural look and feel. Thin coverage can make implant edges or rippling more visible. Fat grafting — transferring the patient’s own fat — adds a layer of natural soft tissue that softens contours and improves the transition between the reconstruction and the surrounding chest.

The quality of grafted fat depends on how it is processed. ABC’s EXAFAT fat dialysis system is designed to remove contaminants while preserving fat integrity and the regenerative stromal vascular fraction, with the goal of more predictable grafting. In a prepectoral reconstruction, well-preserved fat and a well-integrated matrix work together: the matrix provides structure, the fat provides natural cover.

Benefits and considerations of the prepectoral approach

Potential benefits

• Muscle preservation. The chest muscle is left intact, avoiding the functional trade-offs of moving it.
• No animation deformity. Because the muscle is undisturbed, the implant does not move when the muscle contracts.
• Recovery experience. Sparing the muscle can be associated with less muscle-related discomfort for many patients.
• Natural position. The implant sits in the anatomical breast pocket.

Considerations

• Soft-tissue quality matters. Adequate skin and soft-tissue coverage — often supported by fat grafting — is important for a good result.
• Patient selection. Prepectoral reconstruction is not right for everyone; suitability depends on anatomy, oncological factors and individual circumstances.
• It depends on good technology and technique. The approach relies on a high-quality matrix and careful surgical execution.

Prepectoral vs. subpectoral: the practical difference

The clearest way to understand prepectoral reconstruction is to compare it with the subpectoral approach it increasingly complements. In subpectoral reconstruction the surgeon lifts the pectoralis muscle and places the implant partly beneath it, so the muscle provides coverage over the upper part of the implant. That works, but it means cutting and repositioning a functional muscle — which is the source of the animation deformity and the muscle-related discomfort that some patients experience. In prepectoral reconstruction the muscle is left completely undisturbed, and the coverage job that the muscle used to do is taken on by the biological matrix and, where needed, by fat grafting. In other words, prepectoral reconstruction trades reliance on the patient’s muscle for reliance on well-chosen technology — which is only a good trade when that technology is robust and integrates well.

Who might be a candidate?

Prepectoral reconstruction is not a one-size-fits-all solution. Suitability depends on a range of factors that only a surgical team can weigh: the quality and thickness of the skin flaps after mastectomy, oncological considerations such as whether radiotherapy is planned, overall health, body type and personal goals. For some patients it is an excellent option; for others, a different technique — subpectoral placement or autologous (tissue-based) reconstruction — may be more appropriate. The point of the technique is to expand the menu of good options, not to replace every other approach.

What recovery can look like

Because the chest muscle is left intact, many patients report that muscle-related discomfort is less of a feature of prepectoral recovery than it can be with subpectoral techniques, and there is no animation deformity to contend with. That said, recovery still involves the healing of the mastectomy itself and the integration of the matrix, and timelines vary from person to person. Where fat grafting is staged after the initial reconstruction, there will be additional, usually minor, procedures to refine the result. Your surgical team is the right source for a realistic, individualised picture of what to expect.

How the pieces fit together

Prepectoral reconstruction is a good example of how modern med tech for breast reconstruction is designed to work as a system rather than a single product. The implant provides volume; the biological matrix provides support and integrates with the body; fat grafting provides natural soft-tissue coverage. Remove any one element and the approach is harder to achieve well. It is the coordination of these technologies — not any single device — that makes muscle-sparing reconstruction possible.

The bottom line

Prepectoral breast reconstruction offers a muscle-sparing path to a natural result — but it depends on the technologies around the implant. A robust, integrating biological matrix such as ExaShape supports the implant, and well-processed fat grafting provides natural coverage. To go deeper, read our biological matrix guide or compare materials in Biological Matrix vs. ADM vs. Synthetic Mesh.

This article is for general education and is not medical advice. Whether prepectoral reconstruction is appropriate for you is a decision for you and your surgical team.