PDO Threads: The Complete Guide

Overview

PDO (polydioxanone) threads are thin, absorbable surgical sutures that have been adapted for minimally invasive facial and body lifting procedures. Polydioxanone is a synthetic polymer that has been used in surgery since the 1980s — primarily for cardiovascular and pediatric surgical closures — due to its predictable absorption profile and low tissue reactivity (Ray et al., 1981).

The concept of using absorbable sutures for cosmetic lifting originated in South Korea in the early 2010s, where thread lifting became one of the most popular non-surgical aesthetic procedures. The technique spread rapidly to Europe, Asia, and North America, driven by patient demand for alternatives to surgical facelifts that offer shorter recovery times and lower procedural risk (Gulbitti et al., 2018).

PDO threads work through two complementary mechanisms. First, certain thread designs (particularly barbed or "cog" threads) physically grasp and reposition sagging tissue, creating an immediate visible lift. Second, the presence of the foreign-body suture material triggers a controlled inflammatory response that stimulates new collagen and elastin deposition around the thread — a process called neocollagenesis. This collagen-stimulating effect continues even after the PDO material is fully absorbed by the body, typically over 6–8 months (Savoia et al., 2014).

The thread lift market includes several suture materials — PDO, poly-L-lactic acid (PLLA), and polycaprolactone (PCL) — but PDO remains the most widely used globally due to its established safety record in surgery, predictable absorption timeline, and broad availability. The distinction between these materials is discussed in the Thread Types tab.

Thread lifts occupy a specific niche in aesthetic medicine: they provide more visible lifting than injectable fillers or energy-based devices, but less dramatic and shorter-lasting results than surgical facelifts. They are best suited for patients with mild to moderate skin laxity who are not yet candidates for — or do not want — surgical intervention (Tavares et al., 2019).

Quick Facts

This content is for informational purposes only and does not constitute medical advice. Always consult your healthcare provider.

How It Works

Mechanical Lift

Barbed (cog) PDO threads contain small projections — cut into or molded onto the thread body — that act as anchoring points when inserted into the subcutaneous tissue. When the thread is pulled in the desired direction, these barbs engage the surrounding tissue and physically reposition it to a higher, tighter position. This produces an immediate visible lift at the time of the procedure (Savoia et al., 2014).

The mechanical lift depends on several factors:

• Thread design: Bidirectional barbed threads (barbs pointing in opposite directions from a central pivot) provide stronger anchoring than unidirectional designs
• Number of threads: More threads create more anchor points and distribute tension more evenly, reducing the risk of visible dimpling or uneven lifting
• Insertion depth and vector: Correct placement in the subcutaneous fat layer — with the lifting vector aligned to the direction of tissue descent — is critical for natural-appearing results
• Tissue quality: Thicker, more fibrous tissue holds barbs more securely than thin, atrophic tissue

Collagen Stimulation (Neocollagenesis)

The second mechanism — and the reason results can outlast the physical presence of the thread — is collagen stimulation. When PDO suture material is placed in tissue, the body recognizes it as a foreign body and initiates a controlled inflammatory cascade. This process recruits fibroblasts (collagen-producing cells) to the area surrounding the thread (Yoon et al., 2019).

The collagen stimulation process follows a predictable timeline:

• Weeks 1–4: Acute inflammatory phase. Macrophages and fibroblasts accumulate around the thread. Early type III collagen deposition begins.
• Months 1–3: Active fibroplasia. Dense collagen deposition surrounds the thread. New blood vessel formation (angiogenesis) occurs in the peri-thread tissue.
• Months 3–6: Collagen maturation. Type III collagen is gradually replaced by stronger type I collagen. The thread material undergoes hydrolysis and begins to fragment.
• Months 6–8: Thread fully absorbed. The collagen scaffold that formed around the thread remains, providing ongoing structural support.
• Months 8–18: Gradual collagen remodeling. The induced collagen scaffold slowly remodels and diminishes over time, leading to the eventual return of pre-treatment laxity.

Histological studies have confirmed that PDO threads induce significant increases in dermal collagen density, with type I collagen (the strongest structural form) remaining elevated in treated tissue even after complete thread absorption (Yoon et al., 2019).

The Dual Mechanism Advantage

The combination of immediate mechanical lift and gradual collagen remodeling is what distinguishes thread lifts from other non-surgical treatments:

This content is for informational purposes only and does not constitute medical advice. Always consult your healthcare provider.

Thread Types

PDO Thread Designs

Smooth (Mono) Threads

Smooth threads are the simplest design: a single, plain PDO monofilament without any barbs, cogs, or texture. They do not provide mechanical lifting. Instead, they are placed in a mesh-like pattern beneath the skin to create a grid of collagen-stimulating material. The resulting collagen deposition tightens and thickens the dermis over time (Yoon et al., 2019).

Smooth threads are typically used for:

• Skin rejuvenation and texture improvement
• Fine line reduction (not deep wrinkles)
• Mild skin tightening in areas not suitable for barbed threads
• Complementing barbed thread lifts — placed in surrounding areas to improve overall skin quality

A typical treatment may use 10–30 smooth threads per area. They are thinner than barbed threads (commonly 29–30 gauge) and cause less bruising and swelling.

Barbed (Cog) Threads

Barbed threads are the workhorse of thread lifting. The barbs — small angled projections cut into or molded onto the thread — act as anchoring points that grip tissue when the thread is repositioned. Two primary configurations exist:

• Unidirectional: Barbs face one direction. The thread is anchored at a fixed point (typically in the temporal or scalp region) and tissue is lifted toward the anchor. Requires a secure fixation point.
• Bidirectional: Barbs face in opposite directions from a central convergence point. The thread anchors itself within tissue without requiring an external fixation point, creating a self-supporting lift. More commonly used in contemporary practice (Savoia et al., 2014).

Barbed threads are typically 18–19 gauge and 60–150 mm in length. A mid-face lift may use 4–10 barbed threads per side, depending on the degree of laxity and desired result.

Screw (Tornado) Threads

Screw threads consist of one or two PDO monofilaments wound in a spiral (helical) pattern around a central insertion needle. When the needle is withdrawn, the coiled thread creates a small three-dimensional structure within the tissue that provides localized volume enhancement. The increased surface area also amplifies the collagen-stimulating effect compared to a single mono thread (Tavares et al., 2019).

Screw threads are commonly used for:

• Volume restoration in the cheeks and mid-face
• Softening nasolabial folds and marionette lines
• Areas that need both tightening and volume enhancement

PDO vs. Other Suture Materials

This content is for informational purposes only and does not constitute medical advice. Always consult your healthcare provider.

Uses

Facial Applications

Body Applications

PDO threads have been adapted for body contouring and skin tightening, though facial applications remain the most established:

• Décolletage (chest): Smooth threads for sun-damaged, crepey skin on the upper chest
• Arms: Barbed threads for mild upper arm laxity
• Abdomen: Smooth and barbed threads for mild post-weight-loss skin laxity
• Knees: Smooth threads for knee skin laxity
• Buttock lift: Barbed threads for mild gluteal ptosis (limited evidence)

Body applications generally require more threads and produce less dramatic results than facial treatments due to the larger surface areas and greater gravitational forces involved (Tavares et al., 2019).

Ideal Candidates

PDO thread lifts produce optimal results in patients who meet the following profile:

• Age range: Typically 30–60 years old, though suitability depends on tissue quality rather than age alone
• Skin laxity: Mild to moderate — enough descent to benefit from lifting, but not so severe that surgical intervention is required
• Skin quality: Moderate dermal thickness. Very thin skin may show thread outlines or dimpling; very thick skin may resist lifting
• Expectations: Understanding that results are subtle to moderate — not equivalent to a surgical facelift
• Health status: Generally healthy, no active skin infections, not on anticoagulant therapy (relative contraindication)

Poor Candidates

• Patients with severe skin laxity requiring surgical excision
• Very thin, atrophic skin with minimal subcutaneous fat
• Active skin infections or inflammatory conditions in the treatment area
• Patients with unrealistic expectations for non-surgical procedures
• Individuals with autoimmune connective tissue disorders
• Patients with a history of hypertrophic or keloid scarring

This content is for informational purposes only and does not constitute medical advice. Always consult your healthcare provider.

Procedure

Pre-Procedure

• Consultation: Assessment of facial anatomy, skin laxity, tissue thickness, and treatment goals. Photography for documentation. Discussion of realistic expectations and alternatives.
• Medication review: Discontinuation of blood thinners (aspirin, NSAIDs, fish oil, vitamin E) for 7–10 days prior (per provider guidance) to minimize bruising risk. Prescription anticoagulants require coordination with the prescribing physician.
• Day-of preparation: Arrive with clean skin, no makeup. Some providers prescribe a prophylactic antibiotic or antiviral (for patients with herpes simplex history).

The Procedure Step by Step

1. Marking: The provider marks entry points and lifting vectors on the face while the patient is upright. These marks guide thread placement and determine the direction and degree of lift.
2. Anesthesia: Local anesthetic (typically lidocaine with epinephrine) is injected at entry points and along the thread pathway. Some providers use topical numbing cream as well. The procedure should be virtually painless once anesthesia takes effect.
3. Thread insertion: Using a thin cannula (blunt-tipped) or sharp needle, the provider introduces the loaded thread into the subcutaneous tissue plane. For barbed threads, the thread is advanced along the pre-marked vector to the desired endpoint.
4. Tissue repositioning: For barbed threads, the provider gently pulls the thread to engage the barbs and lift the tissue in the desired direction. The degree of lift is assessed visually and by palpation. For smooth and screw threads, the thread is simply deposited in the target tissue plane.
5. Trimming and securing: Excess thread is trimmed flush with or just beneath the skin surface at the entry point. No external sutures are required — the entry points are typically only 1–2 mm and heal without stitches.
6. Assessment: The provider evaluates symmetry and result with the patient upright. Minor adjustments can be made immediately. Ice may be applied to minimize swelling.

Post-Procedure Instructions

• First 24–48 hours: Apply cold compresses intermittently. Sleep on your back with the head elevated. Avoid touching, pressing, or massaging the treated area.
• First 1–2 weeks: Avoid strenuous exercise, excessive facial expressions (wide mouth opening, vigorous chewing), saunas, and steam rooms. Eat soft foods for 3–5 days if jaw area was treated.
• First 4 weeks: Avoid dental procedures, facial massages, and aggressive skincare treatments (chemical peels, microneedling, laser) in the treated area.
• Ongoing: Sleep on your back for 2–4 weeks to avoid displacing threads before tissue adhesion is established.

Procedure Duration and Setting

This content is for informational purposes only and does not constitute medical advice. Always consult your healthcare provider.

Results

Results Timeline

What the Evidence Shows

Clinical studies report patient satisfaction rates of 60–90% at 6 months following PDO thread lifts, with the range reflecting differences in patient selection, provider technique, and assessment methodology (Savoia et al., 2014). Objective measurements using photographic analysis and skin elasticity testing have confirmed measurable improvements in tissue position and skin firmness (Yoon et al., 2019).

Key findings from published studies:

• Barbed thread lifts produce measurable tissue elevation of 3–5 mm in the mid-face, which is clinically visible but modest compared to surgical facelift results (typically 10–15 mm of repositioning)
• Collagen density in PDO-treated tissue increases significantly, with histological studies showing 30–50% increases in dermal collagen at 6 months post-treatment
• Repeat treatments are safe and can be performed after the initial threads have dissolved, with some evidence that cumulative collagen stimulation improves results over successive treatments (Tavares et al., 2019)

Factors Affecting Results

• Provider experience: Thread placement technique is highly operator-dependent. Experienced injectors who perform high volumes of thread lifts consistently produce better, more symmetrical results with fewer complications.
• Thread selection: Matching the right thread type to the treatment area and clinical goal is critical. Using smooth threads where barbed threads are needed (or vice versa) compromises outcomes.
• Patient anatomy: Patients with moderate laxity and reasonable tissue thickness see the best results. Severe laxity overwhelms the lifting capacity of threads.
• Lifestyle factors: Smoking, excessive sun exposure, and significant weight fluctuations accelerate result degradation.
• Combination treatments: Thread lifts combined with dermal fillers, neuromodulators (Botox), or energy-based skin tightening devices often produce superior results to threads alone.

Thread Lifts vs. Surgical Facelift

This content is for informational purposes only and does not constitute medical advice. Always consult your healthcare provider.

Side Effects

Common Side Effects

Less Common Complications

Dimpling and Asymmetry: The Most Discussed Complications

Dimpling and asymmetry are the complications most frequently discussed by patients, as they affect the aesthetic outcome directly. Dimpling typically occurs at barb engagement points or entry sites and is most visible in thin-skinned patients. In most cases, dimpling resolves within 2–4 weeks as tissue settles around the thread and swelling subsides. Persistent dimpling beyond 4 weeks may require gentle massage (per provider instruction) or minor thread adjustment (Savoia et al., 2014).

Asymmetry is inherent to any bilateral facial procedure and is particularly challenging in thread lifting because tissue response varies between sides. Many providers intentionally assess and adjust for pre-existing asymmetry during marking and thread placement. Post-procedure asymmetry can often be improved with additional threads on the under-lifted side at a follow-up visit.

Contraindications

• Active skin infection in or near the treatment area
• Autoimmune connective tissue disorders (e.g., lupus, scleroderma)
• Keloid or hypertrophic scarring tendency
• Pregnancy or breastfeeding
• Anticoagulant therapy (relative — requires coordination with prescribing physician)
• Active inflammatory skin conditions (rosacea flare, eczema) in the treatment area
• Unrealistic expectations for the degree of lift achievable

This content is for informational purposes only and does not constitute medical advice. Always consult your healthcare provider.

Regulatory Status

FDA 510(k) Clearance

Several PDO suture products have received FDA 510(k) clearance, which is a premarket notification pathway for medical devices that demonstrate "substantial equivalence" to an already-marketed (predicate) device. Key points:

• Cleared indication: Absorbable suture for use in soft tissue approximation — i.e., closing wounds during surgery
• Product classification: Class II medical device (product code: GAT — absorbable poly(glycolide/L-lactide) surgical suture)
• 510(k) is not the same as FDA approval. It indicates that the device is substantially equivalent to a predicate device and may be legally marketed. It does not require clinical trial data demonstrating efficacy for a specific cosmetic indication (FDA 510(k) Program).

Off-Label Cosmetic Use

The cosmetic thread lift application of PDO sutures is off-label because:

• The FDA clearance is for wound closure, not for cosmetic tissue repositioning
• No PDO thread product has received FDA clearance or approval specifically for facial lifting
• The insertion technique, purpose (aesthetic lift rather than wound closure), and treatment areas differ from the cleared indication

Off-label use of FDA-cleared devices by licensed healthcare providers is legal and common in medical practice. Physicians have the authority to use cleared devices in ways they deem medically appropriate for their patients, provided they have adequate training and the patient provides informed consent. Off-label use does not imply that a practice is experimental or dangerous — many established medical practices involve off-label device or drug use.

Notable Cleared Products

Several PDO and absorbable thread products have received 510(k) clearance for suture applications. Some manufacturers market these products specifically for thread lifting despite the cleared indication being wound closure. The FDA has issued warning letters to companies making unapproved cosmetic lift claims for 510(k)-cleared suture products (FDA Safety Communication on Absorbable Sutures).

International Regulatory Status

Provider Qualifications

No standardized credentialing exists for PDO thread lifting in the United States. Providers performing thread lifts include:

• Board-certified plastic surgeons
• Board-certified dermatologists
• Board-certified facial plastic surgeons (otolaryngology)
• Board-certified oculoplastic surgeons
• Other physicians with aesthetic medicine training
• Nurse practitioners and physician assistants (scope varies by state)

When selecting a provider, patients should verify board certification, specific thread lift training (including volume of procedures performed), and before/after photo documentation of the provider's own work.

This content is for informational purposes only and does not constitute medical advice. Always consult your healthcare provider.

Cost

Typical Pricing

Cost Factors

• Number of threads: The single largest cost driver. More threads = higher cost, but also more even, natural-appearing results. Providers who use too few threads to cut costs may produce suboptimal outcomes.
• Thread type: Barbed threads cost more per unit than smooth threads. PLLA and PCL threads (non-PDO alternatives) are typically more expensive than PDO.
• Geographic location: Prices in major metropolitan areas (New York, Los Angeles, Miami) are 20–50% higher than in smaller markets.
• Provider experience: Board-certified plastic surgeons and high-volume aesthetic practices generally charge more than less-experienced providers. The price premium often reflects better outcomes and lower complication rates.
• Combination treatments: Thread lifts combined with fillers, Botox, or PRP in the same session may be offered at package pricing.

Insurance Coverage

Cosmetic PDO thread lifts are not covered by any insurance plan. Thread lifts are classified as elective cosmetic procedures. All costs are out-of-pocket. Some providers offer financing through third-party medical credit companies (CareCredit, Prosper Healthcare Lending, etc.).

Long-Term Cost Considerations

Because PDO thread lift results are temporary (12–18 months), the procedure represents a recurring expense for patients who wish to maintain their results. Over a 5-year period:

For patients with moderate to severe laxity who will need ongoing treatment, a surgical facelift may be more cost-effective over the long term despite the higher upfront cost. For patients with mild laxity who may only need 1–2 thread lift sessions, the lower per-session cost of threads is advantageous.

This content is for informational purposes only and does not constitute medical advice. Always consult your healthcare provider.

Questions & Answers

Are PDO thread lifts FDA approved?

Answer: PDO sutures are FDA 510(k) cleared as absorbable surgical sutures for wound closure. Their use for cosmetic thread lifting is off-label — the FDA has not specifically evaluated or approved PDO threads for cosmetic lifting. This is a common and legal practice in medicine; physicians routinely use FDA-cleared devices off-label when supported by clinical evidence and training. The only thread product with specific FDA clearance for mid-face lifting is Silhouette InstaLift, which uses PLLA/PLGA (not PDO) (FDA 510(k) Program).

How painful is the procedure?

Answer: With proper local anesthesia, the procedure itself is generally described as involving minimal pain — pressure and tugging sensations rather than sharp pain. The injection of local anesthetic is typically the most uncomfortable part. Post-procedure soreness is common for 3–7 days and is usually manageable with over-the-counter acetaminophen. Most patients rate the overall pain experience as mild to moderate (3–5 out of 10) (Savoia et al., 2014).

Can PDO threads replace a facelift?

Answer: No. PDO thread lifts produce subtle to moderate improvement and last 12–18 months. A surgical facelift produces more dramatic repositioning of deeper tissue layers (SMAS), removes excess skin, and lasts 5–10+ years. Thread lifts are appropriate for mild to moderate laxity; surgical facelifts address moderate to severe laxity. Thread lifts may delay the need for surgery by several years in appropriate candidates, but they do not replicate surgical results (Tavares et al., 2019).

What happens when the threads dissolve?

Answer: PDO threads undergo hydrolysis (breakdown by water) over approximately 6–8 months and are fully absorbed by the body. During this time, the thread is replaced by a collagen scaffold that the body has deposited around it. This collagen provides ongoing structural support for several months beyond thread dissolution. Eventually, the collagen scaffold itself is remodeled by normal biological processes, and the pre-treatment laxity gradually returns — typically by 12–18 months post-procedure (Yoon et al., 2019).

Can threads be combined with fillers or Botox?

Answer: Yes — combination treatment is common and often produces superior results to any single modality alone. A typical approach might use barbed threads for tissue lifting, fillers (hyaluronic acid) for volume restoration, and neuromodulators (Botox/Dysport) for dynamic wrinkle reduction. Most providers recommend waiting 2–4 weeks between thread placement and filler injection in the same area to allow threads to stabilize and swelling to resolve (Gulbitti et al., 2018).

How many threads do I need?

Answer: The number depends on the treatment area, degree of laxity, and thread type. General ranges: mid-face lift requires 4–10 barbed threads per side; jawline tightening requires 3–6 per side; skin rejuvenation with smooth threads may use 10–30 threads total. Using too few threads is a common cause of suboptimal results — adequate thread count distributes tension evenly and reduces dimpling risk. Your provider should discuss thread count during consultation.

Are there any long-term risks?

Answer: Because PDO is fully absorbed within 6–8 months, long-term foreign-body risks are minimal — the material is gone. The collagen that replaces the thread is the patient's own tissue. Long-term adverse outcomes are primarily related to complications that occur during the healing period (scarring from infection, permanent dimpling from improper placement). No long-term systemic effects have been reported from PDO thread procedures in the published literature (Savoia et al., 2014).

Is there an age limit for thread lifts?

Answer: There is no strict age limit. Suitability depends on tissue quality, degree of laxity, and treatment goals rather than chronological age alone. That said, thread lifts tend to produce the best results in patients aged 30–55 with mild to moderate laxity. Younger patients may not yet have enough laxity to benefit; older patients may have laxity too severe for threads to adequately address.

This content is for informational purposes only and does not constitute medical advice. Always consult your healthcare provider.

Key Takeaways

Based on the available evidence:

• PDO threads are absorbable polydioxanone sutures used for minimally invasive facial and body lifting. The material has been used in surgery since the 1980s and has an established safety profile for wound closure applications.
• They work through two mechanisms: immediate mechanical tissue repositioning (barbed thread designs) and delayed collagen stimulation triggered by the body's foreign-body response to the dissolving suture material.
• Three main thread designs exist: smooth (mono) threads for collagen stimulation and skin tightening; barbed (cog) threads for mechanical lifting; and screw (tornado) threads for localized volume enhancement.
• Results typically last 12–18 months. Peak improvement occurs at 2–3 months as collagen deposition matures. Repeat treatments are safe and may produce cumulative benefit.
• The procedure takes 30–60 minutes under local anesthesia in an office setting, with 3–7 days of downtime for most patients.
• Common side effects include bruising, swelling, dimpling, and asymmetry. Most are self-limiting. Serious complications (infection, nerve injury, thread extrusion) are rare with experienced providers.
• PDO sutures are FDA 510(k) cleared as absorbable sutures for wound closure. Their use for cosmetic thread lifting is off-label — legal and common, but not specifically evaluated by the FDA for that purpose.
• Cost ranges from $1,500 to $4,500 per session, is not covered by insurance, and represents a recurring expense every 12–18 months for patients who wish to maintain results.
• Thread lifts are best suited for patients with mild to moderate skin laxity who want improvement without the cost, risk, and recovery time of surgical facelifting. They do not replace surgical facelifts for patients with severe laxity.
• Provider selection is critical. Thread lift outcomes are highly operator-dependent. Board certification, specific thread lift training, procedure volume, and documented before/after results should all factor into provider selection.

Questions to Ask a Provider

• How many thread lift procedures have you performed, and what is your complication rate?
• Which thread type and design do you recommend for my specific concerns, and why?
• How many threads do you plan to use, and what result can I realistically expect?
• Can I see before-and-after photos of your own patients with similar anatomy?
• What is the total cost, including any follow-up or touch-up treatments?
• What is your approach if I experience dimpling, asymmetry, or other complications?
• Do you recommend combining threads with other treatments (fillers, Botox, energy devices)?
• What brand and material of threads do you use, and are they FDA 510(k) cleared?

Sources & Further Reading

Foundational & Review Articles

• Ray JA, Doddi N, Regula D, Williams JA, Melveger A. (1981) — "Polydioxanone (PDS), a novel monofilament synthetic absorbable suture" — Surgery, Gynecology & Obstetrics
• Savoia A, Accardo C, Vannini F, Di Pasquale B, Baldi A. (2014) — "Outcomes in thread lift for facial rejuvenation: a study performed with happy lift™ revitalizing" — Dermatologic Surgery
• Tavares JP, Oliveira CACP, Torres RP, Bahmad F. (2019) — "Facial thread lifting with suture suspension" — Brazilian Journal of Otorhinolaryngology / Aesthetic Surgery Journal

Mechanism of Action & Histology

• Yoon JC, et al. (2019) — "Histologic analysis of the tissue response to polydioxanone threads" — Journal of Cosmetic Dermatology
• Savoia et al. (2014) — Collagen stimulation and tissue response mechanisms — Dermatologic Surgery

Clinical Outcomes & Complications

• Gulbitti HA, Colebunders B, Pirayesh A, Bertossi D, van der Lei B. (2018) — "Thread-lift sutures: still at the lift? A systematic review of the literature" — Aesthetic Plastic Surgery
• Savoia et al. (2014) — Complication rates and management — Dermatologic Surgery
• Tavares et al. (2019) — Comparative outcomes of thread materials — Aesthetic Surgery Journal

Regulatory & Safety

• FDA: 510(k) Premarket Notification Program — Medical Devices
• FDA Safety Communication: Use of Absorbable Barbed Sutures in Cosmetic Surgery

This content is for informational purposes only and does not constitute medical advice. Always consult your healthcare provider.