Understanding PDO Thread Types and Their Applications

PDO (polydioxanone) thread lifting has emerged as one of the most exciting developments in non-surgical facial rejuvenation. Offering both immediate lifting effects and long-term collagen stimulation, thread treatments bridge the gap between injectable treatments and surgical facelifts. However, not all threads are created equal, different thread types serve different purposes, and understanding these distinctions is essential for achieving optimal results.

Practitioners have undergone advanced training in thread lifting techniques and hold certifications in multiple thread systems. This article provides a thorough overview of PDO thread types, their applications, and what patients can expect from treatment.

What are PDO threads?

PDO (polydioxanone) is a biodegradable synthetic polymer that has been used in surgery as an absorbable suture material for over 30 years. In aesthetic medicine, PDO threads are inserted beneath the skin using fine needles or cannulas to provide mechanical lifting, tissue repositioning, and collagen stimulation.

Once inserted, PDO threads trigger a controlled foreign body response. The body forms new collagen around the threads (a process called neocollagenesis), creating a natural support structure that persists even after the threads themselves have dissolved (typically within 6-8 months). This collagen-stimulating effect is what produces the long-lasting improvements seen with thread treatments.

Types of PDO Threads

Mono threads (smooth threads)

Mono threads are smooth, single-strand threads without barbs or cogs. They are the simplest type of PDO thread and are primarily used for:

• Skin rejuvenation: Stimulating collagen production across broad areas
• Skin tightening: Improving firmness and texture
• Fine line reduction: Addressing superficial wrinkles and crepiness
• Neck rejuvenation: Tightening loose, crepey neck skin

Mono threads are typically inserted in a mesh or grid pattern, creating a scaffold of collagen stimulation across the treatment area. They do not provide mechanical lifting, their effect is purely through bio-stimulation. A treatment session may involve 20-60 mono threads, depending on the area and concern.

Screw/Twist threads

Screw threads consist of one or two mono threads intertwined around the insertion needle, creating a spiral pattern. When the needle is withdrawn, the thread coils within the tissue, which gives:

• Greater volumising effect than mono threads
• Enhanced collagen stimulation due to larger surface area
• Improved skin plumpness and hydration
• Treatment of areas needing both tightening and subtle volume (nasolabial folds, marionette lines)

Cog threads (barbed threads)

Cog threads feature small barbs or hooks along their length that grip the tissue. This provides mechanical lifting and repositioning. They are the most powerful type of PDO thread and are used for:

• Midface lifting: Elevating descended cheek tissue and restoring youthful contours
• Jowl lifting: Repositioning sagging tissue along the jawline
• Brow lifting: Subtle elevation of heavy or drooping brows
• Neck lifting: Addressing platysmal bands and neck laxity

Cog threads can be unidirectional (barbs facing one direction) or bidirectional (barbs facing both directions from a central point). Bidirectional cogs provide anchoring from the middle of the thread, distributing the lifting force more evenly.

Cutting cog threads

A more advanced variant where the barbs are cut into the thread body rather than moulded. Cutting cogs generally provide stronger tissue grip and greater lifting force than moulded cogs.

Thread materials beyond PDO

Whilst PDO is the most widely used thread material, two alternatives are gaining popularity:

PCL (Polycaprolactone) Threads

PCL threads dissolve more slowly than PDO (12-18 months vs 6-8 months). This provides longer-lasting collagen stimulation. They also produce a stronger neocollagenesis response. Examples include Mint threads and Silhouette Soft (which also contain PLLA cones).

PLLA (poly-l-lactic acid) threads

PLLA is the same material used in Sculptra, known for its powerful collagen-stimulating properties. PLLA threads provide the strongest bio-stimulatory effect and the longest-lasting results (up to 2 years). However, they are also the most expensive option.

Treatment areas and applications

The thread lift for lower face rejuvenation

The most common thread lift procedure addresses the lower face, specifically jowling and loss of jawline definition. Cog threads are inserted along predetermined vectors to lift descended tissue back toward its youthful position. Typically, 2-4 cog threads per side are used, often combined with mono threads for additional skin quality improvement.

Midface Enhancement

Cog threads can restore cheek volume and elevation that has been lost with ageing. This is particularly effective for patients with mild to moderate midface descent who are not yet candidates for a surgical facelift.

Neck Rejuvenation

The neck is one of the most challenging areas to treat non-surgically. Mono threads in a mesh pattern can significantly improve neck skin quality, whilst cog threads can address platysmal bands and provide subtle vertical lifting.

Non-surgical brow lift

Cog threads placed in the temple and brow area can provide a subtle but effective brow elevation, opening up the eye area without surgery or the “frozen” look that excessive botulinum toxin can produce.

Body Applications

Thread treatments are increasingly used on the body for:

• Inner arm tightening
• Knee skin tightening
• Abdomen skin tightening (post-pregnancy or weight loss)
• Buttock lifting

The treatment process

Consultation

A thorough consultation includes facial/body analysis, assessment of skin quality and laxity, discussion of goals, and detailed explanation of the procedure, risks, and expected outcomes.

The Procedure

Thread insertion is performed under local anaesthesia. The procedure takes 30-90 minutes, depending on the number and type of threads used and the treatment area. Threads are inserted using pre-loaded needles or cannulas, with the practitioner guiding the thread along precise vectors to achieve the desired lifting effect.

Recovery

• Day 1-3: Swelling, mild bruising, and tenderness are common. Paracetamol is usually sufficient for pain management.
• Day 3-7: Swelling subsides. Minor dimpling at insertion points resolves.
• Week 2-4: Results settle into their final position. Collagen stimulation begins.
• Month 1-3: Progressive improvement as new collagen matures.

Patients should avoid vigorous exercise, excessive facial movement, dental work, and sleeping face-down for 2-4 weeks post-treatment.

Results and Longevity

Thread lift results are both immediate (from the mechanical lifting of cog threads) and progressive (from collagen stimulation over subsequent months). Results typically last:

• PDO threads: 12-18 months
• PCL threads: 18-24 months
• PLLA threads: Up to 24 months

“Thread lifting occupies a unique position in aesthetic medicine, it is the only non-surgical treatment that provides true tissue repositioning. Whilst fillers add volume and toxins relax muscles, threads physically lift and reposition descended tissue. For the right patient, this can be transformative.”

Frequently asked questions

Conclusion

PDO thread treatments offer a versatile, evidence-based approach to non-surgical lifting and rejuvenation. Understanding the different thread types and their specific applications is crucial for achieving optimal outcomes. With the right thread selection, precise technique, and appropriate patient selection, thread treatments can deliver results that genuinely bridge the gap between injectables and surgery.

To discuss whether a thread lift is right for you, book a consultation with the trained thread lift practitioners.