Understanding Thread Lifts — PDO vs PCL vs PLLA

Last updated: 5 March 2026

Thread lift procedures have undergone a remarkable renaissance in aesthetic medicine, evolving from earlier techniques with mixed results into a refined, evidence-based treatment option that bridges the gap between injectable treatments and surgical facelifts. Modern absorbable thread technologies — PDO, PCL, and PLLA — each offer distinct properties and clinical advantages. At Axiom Aesthetics, our practitioners are experienced in the latest thread lift techniques and can advise on the most appropriate thread type for individual treatment goals.

How Thread Lifts Work

Thread lifts involve the insertion of biocompatible, absorbable sutures into the subcutaneous tissue using fine cannulae or needles. These threads produce two therapeutic effects: an immediate mechanical lift through physical repositioning of tissue, and a delayed biological response through collagen stimulation triggered by the foreign body reaction to the thread material.

The threads used in modern aesthetic practice are equipped with various anchoring mechanisms — barbs, cogs, cones, or spirals — that grip the tissue and provide the lifting force. As the threads are gradually absorbed by the body over months, the collagen matrix that forms around them provides a natural scaffolding that maintains the lifting effect beyond the thread’s lifespan.

PDO (Polydioxanone) Threads

PDO is the most established and widely used thread material in aesthetic practice. Polydioxanone has been used in surgery for decades as an absorbable suture material and has a well-characterised safety profile.

Properties and Mechanism

• Absorption time: 6-8 months
• Collagen stimulation duration: Effects persist for 12-15 months after insertion
• Mechanism: PDO stimulates type I collagen production and neovascularisation through a controlled inflammatory response
• Variants: Available as mono threads (smooth), screw/tornado threads (twisted), and barbed/cogged threads (lifting)

Clinical evidence for PDO threads includes a study by Yoon et al. (2019) in Dermatologic Surgery demonstrating significant improvements in skin laxity scores and patient satisfaction at 6 and 12 months post-treatment. Histological analysis confirmed increased dermal collagen density and improved collagen fibre organisation in PDO-treated tissue.

PCL (Polycaprolactone) Threads

PCL threads represent a newer generation of thread technology that offers extended longevity compared to PDO. Polycaprolactone is a biodegradable polyester that has been used in medical implants and drug delivery systems.

Properties and Mechanism

• Absorption time: 12-24 months (significantly longer than PDO)
• Collagen stimulation duration: Effects can persist for 2-3 years
• Mechanism: PCL stimulates types I and III collagen production with a more sustained and gradual inflammatory response
• Key advantage: Longer-lasting results due to extended presence in the tissue and prolonged biostimulatory effect

Research by Kim et al. (2019) published in the Journal of Cosmetic Dermatology compared PCL and PDO threads and found that PCL threads produced a more sustained collagen response, with measurable collagen induction continuing for up to 24 months. Patient satisfaction scores were higher for PCL threads at the 18-month follow-up point.

PLLA (Poly-L-Lactic Acid) Threads

PLLA is the same biocompatible polymer used in Sculptra, the injectable collagen stimulator with decades of clinical use. PLLA threads combine the mechanical lifting action of thread insertion with the potent collagen-stimulating properties of the PLLA polymer.

Properties and Mechanism

• Absorption time: 12-18 months
• Collagen stimulation duration: Effects can persist for 2+ years due to the potent biostimulatory nature of PLLA
• Mechanism: PLLA particles stimulate robust neocollagenesis through a subclinical inflammatory response, producing progressive tissue volumisation over time
• Key advantage: Superior collagen stimulation compared to PDO, with both lifting and volumising effects

Clinical data published by Sapra et al. (2020) in Plastic and Reconstructive Surgery demonstrated that PLLA threads produced statistically significant improvements in mid-face laxity, nasolabial fold depth, and skin quality scores, with results sustained at 24-month follow-up.

Comparing the Three Thread Types

The choice between PDO, PCL, and PLLA threads depends on the patient’s specific treatment goals, the degree of laxity, and the desired duration of results:

• For skin rejuvenation and mild tightening: PDO mono or screw threads offer an accessible entry point with shorter recovery and lower cost
• For moderate lifting with extended results: PCL barbed threads provide the longest-lasting physical presence in the tissue
• For maximum collagen stimulation and volumisation: PLLA threads offer the most potent biostimulatory effect
• For patients seeking the most established evidence base: PDO threads have the longest track record and the most published literature

Safety and Complications

Thread lifts are generally safe when performed by trained practitioners, but potential complications include asymmetry, thread palpability or visibility, dimpling, infection, and thread migration. A systematic review by Tavares et al. (2017) reported an overall complication rate of approximately 14% for thread lifts, with the majority being mild and self-limiting (such as temporary dimpling and bruising). Serious complications including infection and nerve injury were rare at less than 1%.

Frequently Asked Questions

How long do thread lift results last?

Results vary by thread type: PDO threads typically provide visible improvement for 12-15 months, PCL threads for 2-3 years, and PLLA threads for 2+ years. The collagen stimulated by the threads continues to provide structural support even after the threads have been absorbed.

What is the recovery time for a thread lift?

Most patients experience mild swelling and bruising for 3-7 days. Patients are advised to avoid strenuous exercise, excessive facial movement, and sleeping on their side for 2 weeks. Most people return to work and social activities within 2-3 days, making thread lifts a relatively low-downtime procedure.

Can thread lifts be combined with other treatments?

Yes, thread lifts work synergistically with other aesthetic treatments. They are commonly combined with dermal fillers for volumisation, anti-wrinkle injections for dynamic line reduction, and skin boosters for overall skin quality improvement. Your practitioner will advise on appropriate timing and sequencing of combination treatments.

Are thread lifts painful?

Thread lifts are performed under local anaesthesia, so the insertion process is not painful. Patients may experience some pulling or tugging sensations during thread placement. Post-procedure discomfort is typically mild and managed with over-the-counter painkillers for 2-3 days.