The Reconstructive Ladder
Plastic and reconstructive surgeons think about wound closure as a "reconstructive ladder" — a hierarchy of techniques from simplest to most complex. The aim is always to use the simplest technique that reliably achieves a good result, not the most complex one available. Options range, in ascending complexity, from direct closure and healing by secondary intention, through skin grafts, to local, regional and free flaps, sometimes combined with tissue expansion. The right rung of the ladder depends on the size, depth, location and cause of the defect — not on a fixed rule.
Skin Grafts
A skin graft is a piece of skin taken from one area of the body (the donor site) and transferred completely — without its own blood supply — to cover a wound elsewhere. It survives initially by absorbing nutrients from the wound bed before new blood vessels grow into it over the following days.
Split-thickness skin grafts take the top layer of skin plus a portion of the dermis beneath it. They are thinner, take reliably over a larger area and heal well even on less-than-ideal wound beds, but the donor site heals like a graze and the graft itself shrinks (contracts) more over time and can look different in texture and colour from surrounding skin.
Full-thickness skin grafts take the entire thickness of the dermis along with the top layer. They give a better colour and texture match and contract far less, making them preferable for visible areas such as the face — but they only survive reliably over smaller defects with a good blood supply, and the donor site needs to be closed directly, leaving a linear scar rather than a graze.
Flaps
A flap differs from a graft in one crucial respect: it brings its own blood supply with it. This makes flaps far more robust than grafts, able to survive on less favourable wound beds (such as over exposed bone, cartilage or after radiotherapy) and to provide durable, like-for-like tissue — skin, fat, muscle, or a combination — rather than a thin skin surface alone.
- Local flaps — tissue moved from immediately adjacent to the defect, rotated, advanced or transposed into place, keeping the closest possible colour and texture match. Most facial reconstruction after skin cancer excision uses local flap techniques.
- Regional flaps — tissue moved from a nearby but not immediately adjacent area, still attached to its original blood supply via a pedicle.
- Free flaps — tissue completely detached from its original site, including its blood vessels, and reconnected to vessels near the defect under an operating microscope (microsurgery). This allows tissue to be moved from almost anywhere on the body to reconstruct almost any defect, and is reserved for larger or more complex reconstructive problems.
Tissue Expansion
Tissue expansion uses a silicone balloon (expander) placed beneath healthy skin adjacent to a defect, then gradually inflated with saline over several weeks in outpatient visits. The overlying skin stretches and grows new tissue, which can then be used to reconstruct the defect with skin that matches the surrounding area closely in colour, texture and hair-bearing quality. It is particularly useful in scalp reconstruction and in staged reconstruction where a very good colour and texture match matters.
Choosing the Right Technique
The choice between these options depends on the size and depth of the defect, its location (function and appearance both matter more on the face and hands), the quality of the surrounding tissue, and the reason for reconstruction — planned excision, trauma, or cancer surgery each carry different priorities. This is assessed and discussed individually; where a defect is straightforward, a graft or local flap may be entirely appropriate, and more complex free-flap reconstruction is reserved for situations that genuinely need it.
Where This Applies in Practice
- Skin Cancer Excision & Reconstruction — local flaps and grafts are commonly used to reconstruct the resulting defect
- Nasal Reconstruction — a common site for local flap reconstruction after skin cancer excision
- Scar Revision — occasionally uses local flap techniques to reorient or improve a problematic scar
- Mole, Cyst & Lipoma Removal — most defects here are closed directly, without needing a graft or flap
Further Reading
For more detailed patient information on reconstructive techniques, the British Association of Plastic, Reconstructive and Aesthetic Surgeons (BAPRAS) and the British Association of Aesthetic Plastic Surgeons (BAAPS) both publish independent, non-commercial patient information resources.