Lifting threads with cones or barbs: what we know

The lifting thread emerged to answer a limitation of the smooth thread: if the goal is to reposition tissue, the thread needs to "hold" the tissue. The mechanical solution was to add anchoring structures to the thread, such as cones, barbs or cogs oriented in one direction, which grip the tissue and allow it to be pulled. This increased the power of repositioning, and also the risk profile.

This guide is a review. It explains how mechanical anchoring works, what the literature describes, what the characteristic risks are and who tends to be a good candidate. It does not include insertion technique, vectors, quantity or protocol, which are decisions for the qualified professional, according to the product's package insert and the rules of their professional council. For the overview of types, see types of PDO threads.

How does anchoring work?

In a lifting thread, the anchoring structures (molded cones, cut barbs or cogs) are oriented so that the thread slides in one direction and catches in the opposite direction. When the thread is positioned and tensioned, these structures fix into the tissue, and the thread starts to exert a force that supports or repositions the tissue it holds. This is the principle of anchoring. The force that tries to push the thread back out is called the extrusion force, and it is related to the traction applied to the tissue.

The difference from the smooth thread is fundamental. The smooth thread does not catch or pull; its effect, when there is one, comes from tissue stimulation. The thread with cones or barbs tries to combine stimulation with traction. That is why it is used in indications where some repositioning is sought (for example, in the midface or the jawline), and it is more demanding in patient selection and technique. For the smooth thread, see smooth threads for biostimulation.

What does the literature describe?

Studies describe a subtle to moderate improvement in laxity in selected cases, with a repositioning effect measured on photos and on global improvement scales such as the GAIS. The studies are generally small, with short follow-up, with different techniques and products and few comparisons between anchoring types. Adverse events described include pain, swelling, bruising, dimples, asymmetry, palpable thread, extrusion, infection and nodules.

An important observation: the traction effect tends to decrease over time, as the tissue responds, the thread is absorbed and gravity acts. What looks like an initial "lift" includes swelling, and later assessment usually shows a smaller effect. See the analysis in PDO threads: what the literature shows.

What are the characteristic risks?

The general thread risks apply. Those that stand out with threads with cones or barbs are:

• Pain and pulling, mainly when opening the mouth, chewing and smiling, in the first days;
• Dimples, waviness and irregularities, when the anchoring catches the skin in a superficial plane or the traction is uneven;
• Asymmetry, when the tissue responds differently on each side;
• Extrusion, in which the tip or an anchor comes out through the skin or mucosa;
• Palpable or visible thread, more likely in thin skin;
• Migration or retention, in which the thread changes position or is hard to remove;
• Infection and nodules, which need prompt assessment;
• Injury to structures, such as nerve branches, the parotid gland and vessels, in areas where the path is close.

For recognition and management of each, see complications with PDO threads, dimpling and irregularity and thread extrusion and visibility.

Who tends to be a good candidate?

In general, the patient with mild to moderate laxity, skin of reasonable thickness, an expectation of subtle repositioning and acceptance of the risk and of possible removal. Patients with very thin skin, significant laxity, excess skin, dominant volume loss, active infection, a history of poor healing or active autoimmune disease have a more restricted indication. Patients who expect the effect of a surgical lift should be counseled and, where appropriate, referred.

It is also worth talking about lifestyle: the usual post-procedure recommendation is to limit wide facial movements for a period, such as big yawns and very forceful chewing, and to avoid procedures that pull on the area. The written guidance is in post-PDO-thread instructions template.

How to explain it to the patient?

The image of a "hook" helps explain why it hurts more and why the effect is one of traction. It is also important to be clear about what the thread does not do: it does not replace volume, does not remove excess skin and does not last forever.

Where does Harmy come in?

Harmy does not simulate threads or traction. The app shows an illustrative projection of volume in marked areas over the frontal photo, which helps tell apart, in the conversation with the patient, when the problem is volume (a filler response) and when it is position (a lifting matter). The projection is illustrative and does not predict the result of any thread.

Summary

Threads with cones or barbs offer anchoring and traction, with subtle repositioning and a higher mechanical risk profile. Select well, explain the limit of the effect, describe pain, extrusion and visibility in the consent and have a plan for removal. For the smooth thread and skin stimulation, the logic and the risk are different.