Linear threading technique: what it means
Quick facts
- Definition
- A pattern in which product is deposited along a straight path, like a thread.
- Also known as
- Linear threading.
- Variations
- Retrograde (while withdrawing the instrument) or anterograde (while advancing it).
- Used in
- Described for folds and contour lines, at the professional's discretion.
- Attention
- The path crosses tissue and may pass close to vessels.
Linear technique, or linear threading, is the term that describes depositing the product along a path in a line, as if it were a thread. The instrument travels a path and the product is released along it. It is one of the patterns most cited in the HOF literature, partly because it is simple to describe and is often used in folds and contour lines.
Retrograde or anterograde?
Linear deposition can be described in two directions. In the retrograde form, the product is released while the instrument is withdrawn; in the anterograde form, while it advances. Each form has arguments discussed among professionals, related to control, discomfort and safety. This entry does not recommend one or the other, and the concept of retrograde injection is covered separately.
How does it differ from other patterns?
| Pattern | Characteristic |
|---|---|
| Linear | One path, deposition along the line |
| Fanning | Several paths from one entry |
| Cross-hatching | Crossing lines |
| Serial puncture | Several small deposits |
The difference does not define which is "better". Each region has its own anatomical layout, and the professional chooses according to the anatomy and the goal, after assessment.
Where does the caution lie?
Because the path crosses tissue, it may pass close to vessels and nerves. In regions of high vascular risk, such as the nasolabial fold, the glabella and the temples, this caution is greater. Safety depends on knowledge of anatomy, a conservative volume, the right instrument (needle or cannula) and preparation to recognize a vascular occlusion, with hyaluronidase on hand when hyaluronic acid is used.
How to explain it to the patient
The patient does not need to memorize the name. Explain that the product can be injected in different ways and that the choice depends on the region and the anatomy. Reinforce what to expect (swelling, marks, bruising) and when to call. Comparing with other people's results or with videos is misleading, because each face responds differently.
In Harmy
Harmy shows an illustrative projection of the marked volume by area, without indicating injection paths. It does not replace planning or the choice of technique, which belong to the qualified professional.
Also called: linear threading, line injection.
Frequently asked questions
Are retrograde and anterograde linear techniques the same thing?
No. In the retrograde one the product is released while the instrument is withdrawn; in the anterograde one, while it advances. Each has arguments and risks discussed in the literature, and the choice rests with the professional.