Deep plane versus SMAS: what the difference actually is

Almost every confused facelift consultation turns on this distinction, and almost none of the confusion comes from the anatomy, which is straightforward. It comes from the fact that both terms are used as marketing categories as well as technical ones. This page separates the two.

01The layer both operations are about

Beneath the skin and the fat of the face lies a continuous sheet of fibrous and muscular tissue known as the superficial musculoaponeurotic system, almost always shortened to SMAS. It is continuous with the platysma in the neck and with the superficial temporal fascia above the arch. It is the layer that gives the soft tissue of the face its structural integrity, and it is what descends with age.

Two further structures matter for this comparison. The first is the set of retaining ligaments, short fibrous tethers that anchor the SMAS and the overlying tissue to the underlying bone and deep fascia at specific points. The second is the facial nerve, whose branches run in a plane that becomes progressively more superficial as they travel forward across the face. Everything that follows is a consequence of those three facts.

The important corollary is that skin is not the target. Skin is elastic, it stretches, and an operation that relies on pulling it produces tension where it is anchored, which is why older techniques left a recognisable signature at the earlobe and the corner of the mouth. Our technique families page sets that history out in more detail.

02What a SMAS technique does

SMAS techniques act on the layer from above. They are a family rather than a single operation, and the common members are these.

• Plication. The SMAS is folded on itself and secured with sutures. Nothing is cut and nothing is removed. It is the least invasive member of the family and the least powerful.
• Imbrication. The layer is incised, overlapped and secured, which allows a stronger repositioning than folding alone.
• SMASectomy. A strip of the layer is excised and the edges closed, shortening the sheet along a chosen vector.
• Extended SMAS. The layer is elevated as a flap over a wider area before being repositioned, which allows the SMAS to be moved independently of the skin over a greater distance.

The unifying idea is that the SMAS is tightened or shortened, and the skin is then redraped over it separately and closed without carrying the load. In experienced hands these techniques produce excellent, durable results, and the extended variants in particular reach a great deal.

03What a deep plane technique does

A deep plane technique enters beneath the SMAS rather than above it. The surgeon develops a plane under the layer, deliberately releases the retaining ligaments that tether it, and then moves skin, fat and SMAS together as a single composite unit before fixing it in its new position.

Two consequences follow. The first is that nothing is stretched: a block of tissue that has been released is moved and secured, so the skin is not carrying tension. The second is that release of the ligaments allows movement in the mid face and along the nasolabial region that techniques working above the SMAS find harder to achieve, because those ligaments are precisely what holds that tissue down.

The cost of that is technical. Dissection beneath the SMAS runs closer to branches of the facial nerve, the plane is less forgiving, and the operation depends on the surgeon knowing exactly where they are at every point. This is not an argument against it. It is an argument against having it done by someone who does it occasionally, which is the single most useful thing to take from this page.

04What each approach reaches

05Where the difference is real, and where it is marketing

The difference is real in the mid face. If your main concern sits in the cheek and the fold running from nose to mouth, the question of whether the retaining ligaments are released is a genuine one, and it is reasonable to ask a surgeon how they plan to reach it.

The difference is much less real along the jawline, where strong SMAS techniques and deep plane techniques both perform well, and where the outcome depends far more on who is operating than on which family the operation belongs to. It is not real at all for skin quality, which neither operation changes, and it is not real for the brow or the eyes.

Treat any branded name for a lift as a description of nothing until it is explained in the terms above. If a named technique cannot be placed as a member of one of these families, ask which layer is being worked on and whether ligaments are released. Every legitimate operation has an answer to that question.

06Risk, recovery and durability

Both operations carry the risk profile of facial surgery: bleeding and haematoma, infection, nerve injury that is usually temporary and occasionally not, scarring, asymmetry, hairline displacement, earlobe distortion and the general risks of anaesthesia. Our risks page sets these out in full and explains why this site publishes no complication percentages.

Reported swelling after a deep plane dissection is often described as taking longer to settle, which is consistent with the extent of the dissection, and the practical planning point is that neither operation has a short recovery. The recovery page stages what the first year actually looks like. On durability, the argument for the deep plane approach is that a result achieved without tension should not relax in the way a tension based result does. That is a mechanical argument rather than a demonstrated one, and it should be presented to you as such.

07What to ask, so the answer means something

1. Which layer will you be working on, and will you be above or beneath the SMAS?
2. Will you release retaining ligaments, and if so which?
3. What is my main concern in anatomical terms, and does the plane you have chosen reach it?
4. What will the skin be doing in this operation?
5. How often do you perform this specific operation?
6. What would you do differently if you were not offering the technique you have just described?

The last question is the useful one. A surgeon who can describe the alternative operation and say why it was not chosen for you is reasoning about your face. Our consultation checklist takes this further, and choosing a surgeon covers how to check the specialist register before you get that far.

08What this page does not cover

This page compares two families of technique. It does not recommend one, because the sensible choice depends on an examination that no website can perform. It publishes no complication rates, because reported rates vary by technique, definition and case series in ways that make a single figure misleading. It names no surgeon, clinic or hospital. It does not cover energy based or injectable treatments, which act at or above the SMAS and cannot release a ligament or remove skin. And it is not medical advice.