Structured Injection Systems: How Clinicians Plan Filler Placement

Structured injection-mapping systems give clinicians a shared, coded way to plan where, how deep and how much hyaluronic acid filler to place. A 2021 paper by a Brazilian plastic surgeon set out one such system in detail, linking each injection point to an overall goal such as looking less tired or less sad. The framework can help with planning and teaching, but the author acknowledged it had not been tested in clinical trials and no safety data specific to the method were available.

Why this was studied

Filler treatment used to focus on single lines or folds: fill the crease, move on. Over time, clinicians recognised that this can leave a face looking unbalanced, or even overfilled, without addressing why someone looks tired or older. A whole-face approach looks at underlying support, proportions and the impression a face gives.

Whole-face planning is harder to teach and standardise. Coded mapping systems try to fix that by giving each area a label and attaching consistent instructions to it, so that plans are clearer, more repeatable and easier to explain.

How the system works

Dr. Maurício de Maio's paper describes a system in which each injection site has a short code made of letters and a number. The letters stand for a facial region, such as the cheek or temple, and the number stands for a smaller zone within it. For each code, the paper specifies:

• The tissue layer to target, such as just above the bone or just under the skin
• Whether to use a needle or a blunt cannula
• The delivery style, such as a small deposit, a thin line or a fan
• A suggested minimum starting volume per side

Codes are grouped into combinations for common concerns, and decision guides help select codes by severity. The paper recommends a sequence that starts with foundational support in the midface, then contour around the temples and jaw, then fine refinement around the eyes, lips and nose. Some codes are flagged as higher-risk areas near important blood vessels and are reserved for highly trained injectors.

What the evidence shows

The paper is mainly a description of a method, illustrated with three example cases. The author also reported on 387 patients in his own practice, where the most frequent side effect was mild to moderate local swelling and no serious complications such as tissue damage from blocked vessels were reported. Outcomes were described from clinical impressions and photographs rather than validated rating scales.

The author was candid about the gaps. He stated the system reflects his own opinion, has not been supported by independent clinical trials and that no safety data for treatment using the method exist.

How strong is this evidence?

This is expert opinion and descriptive experience, sitting at the lower end of the evidence scale. It can tell us how one experienced clinician plans treatment. It cannot tell us whether patients do better with this approach than with careful, individual planning by other methods.

A few further cautions:

• The suggested volumes are based on particular filler products and are meant as starting points, not fixed amounts.
• The work was sponsored by a filler manufacturer, and the author had consulting ties to that company.
• Applying a code system does not remove the variation in people's anatomy or in injector skill, which the paper itself notes.

What it means for you

For patients, the main benefit of structured planning is clarity. A coded plan can make it easier to understand what is being treated and why, to track what was done at each visit and to avoid adding product where it is not needed. Linking treatment to an overall goal, rather than chasing every line, also fits well with keeping results natural.

A map is only a starting point. Your face, your goals and your health history should shape the plan, and doses should be adjusted to you. Summing suggested volumes may also produce a larger total than you need or want. It is entirely reasonable to treat in stages or to address fewer areas. Our article on combination treatment plans discusses pacing, and avoiding an overfilled look covers why restraint matters.

Hyaluronic acid filler is usually postponed during pregnancy or breastfeeding, with active infection or cold sores, and close to dental work or major events. Swelling and bruising are common. Rarer risks include lumps, delayed swelling and blood vessel blockage, which needs immediate care.

Plans, photographs and records

Whatever method a clinician uses, good records are a practical safeguard. Noting the product, amount, depth and location at every visit, alongside consistent photographs, makes it easier to see how a face is changing over years and to avoid adding filler where some may remain. It also helps any future clinician understand what has been done, including if dissolving or a complication assessment is ever needed. A coded system is one way to keep such records tidy, but careful notes in plain language can serve the same purpose.

Questions to ask at your consultation

• What overall change are we aiming for, and which areas matter most for that?
• How much product do you expect to use, and can we start with less?
• How will you record what was done so we can review it next time?
• Which areas in my plan carry higher risk, and how do you manage that?

Frequently asked questions

Does a coded system make treatment safer?

It may help with consistency and planning, but safety still depends on anatomy knowledge, technique and readiness to manage complications. The original paper reported no method-specific safety data.

Will everyone get the same treatment?

It should not work that way. The codes are a common language. A good plan still adapts to each person's face and preferences.

Do I need many areas treated at once?

No. Many people do well with a few targeted areas, treated over more than one visit, or with no filler at all.

If you would like a clear, staged plan explained in plain language, HealthPark Medical Aesthetics in Sydney can go through your options at a consultation, including whether treatment is needed.

Source

de Maio M. A methodological approach to facial aesthetic treatment with injectable hyaluronic acid fillers. Aesthetic Plastic Surgery, 2021. Read the study