PDO Threads: A Practitioner Buying Guide

Thread choice begins with geometry, not brand; mono, cog and screw each solve a different clinical problem.

Polydioxanone (PDO) threads have become one of the most frequently ordered consumables in UK aesthetic clinics, yet the sheer variety of gauges, geometries and polymer options creates a genuine sourcing challenge. This guide is written for licensed practitioners who are ready to move beyond introductory training and want a structured framework for evaluating threads before placing a clinic order. It covers polymer science, the three core geometries, indication mapping, brand families available in the UK, qualification requirements, patient selection principles, and practical buying considerations.

What PDO Threads Are and the Polymers Behind Them

PDO threads are absorbable sutures manufactured from polydioxanone, a synthetic polymer that has been used in surgical suturing since the 1980s. When placed subdermally or within the superficial musculoaponeurotic system (SMAS) plane, they produce two distinct effects: an immediate mechanical lift from the thread structure, and a biological response in which the body's foreign-body reaction lays down new collagen along the thread's path before the polymer is absorbed. The collagen deposition is considered the longer-lasting benefit by most published accounts.

Three polymer families are now in clinical use:

• PDO (polydioxanone): The original and most widely used material. Absorbed via hydrolysis in approximately six months. Lower cost per unit than alternatives, extensive published safety record, suitable for most geometries.
• PLLA (poly-L-lactic acid): Slower absorption, typically 12 to 18 months. Greater collagen stimulus over a longer period. Higher unit cost. Used where prolonged biostimulation is the primary goal rather than mechanical lift.
• PCL (polycaprolactone): The slowest-absorbing of the three polymers, with absorption times reported at 24 months or longer. Most commonly combined with PLLA in blended threads. Evidence base is smaller than for PDO, and practitioners should refer to manufacturer Instructions for Use (IFU) for current clinical data.

For practitioners building a clinic formulary from scratch, PDO threads offer the broadest evidence base and the most established supplier network in the UK. PLLA and PCL threads are appropriate additions once a PDO protocol is confident and audited.

The Three Thread Geometries Explained

Geometry determines mechanism of action. Getting this wrong at the ordering stage means buying threads that cannot achieve the clinical outcome the patient needs.

Mono threads

Smooth, barb-free sutures. They do not grip tissue and therefore produce no mechanical lift. Their role is biostimulation: the collagen response generated during absorption improves skin quality, texture and fine line depth. Typically deployed in a mesh or grid pattern using fine-gauge needles. Low technical barrier relative to barbed geometries, making them a sensible entry point for practitioners new to thread work.

Cog (barbed) threads

Cog threads carry bidirectional or unidirectional barbs cut or moulded into the suture body. The barbs anchor into the subdermal fat or superficial fascia and allow the practitioner to reposition tissue along the thread's axis. This is the geometry that delivers the visible mechanical lift associated with thread procedures. The lift from barbs is real but modest; published literature consistently describes incremental rather than surgical outcomes, and practitioners should counsel patients accordingly.

Screw and spiral threads

A single or twin thread coiled around the needle in a helical pattern. The coil configuration creates a larger volumetric footprint than a mono thread of the same gauge, and the resulting biostimulation is more concentrated. Screw threads are frequently used for volume enhancement in areas such as the lips, nasolabial folds and the backs of the hands. They do not generate the mechanical anchoring of a cog but produce a more pronounced collagenesis response than a mono in the same location.

Comparison of Thread Geometries

Longevity figures are indicative. Individual outcomes depend on patient anatomy, age, skin quality, insertion depth and post-procedure care. No clinical guarantees can be drawn from published averages. See individual manufacturer IFU for specific thread specifications.

Matching Geometry to Indication

A structured consultation should inform geometry selection before brand selection. The following mapping reflects common clinical practice; it is not a substitute for hands-on training or peer-reviewed clinical protocols.

• Skin quality improvement across the face or neck: mono threads in a fine grid pattern. Consider 29G or 30G needles for fine tissue areas.
• Jowl definition and lower face lift: cog threads anchored in the temporal or preauricular region. Vector planning is critical; this indication has the highest technical demand.
• Brow elevation: cog threads with a superior vector. The frontalis insertion point requires precise anatomical knowledge.
• Nasolabial fold softening: screw or mono threads placed in and around the fold. Cog threads are rarely indicated in this location due to the dynamic movement of the mid-face.
• Lip definition and vermilion border: screw threads. Very fine gauge (30G or 31G). Patients must be counselled on expected swelling duration.
• Hand rejuvenation: mono or screw threads. Thin skin and prominent tendons demand conservative insertion depth and careful needle passage.

For practitioners ordering threads to expand an existing PDO thread range, the audit question is: does a gap exist in geometry coverage, or in gauge options for a geometry you already use well?

Brand Families Available in the UK

The UK market has a number of established thread brands. Three that practitioners encounter frequently, and that are distributed with clinical documentation and UK-compliant labelling, are described below. This is not an exhaustive list, and practitioners should always request the manufacturer's IFU before clinical use.

Mint PDO (HansBiomed)

HansBiomed is a South Korean manufacturer with an established presence in UK aesthetics. The Mint PDO range covers cog and mono geometries in multiple gauges. The cog threads use a moulded barb process rather than a cut-barb process, which HansBiomed states in its IFU preserves tensile strength at the barb insertion point. Practitioners considering the Mint range should review the current HansBiomed IFU for needle dimensions, insertion depth guidance and contraindication listings.

Croma PDO

Croma is an Austrian pharmaceutical and medical device company with a long-standing European distribution network. The Croma PDO range includes mono, cog and screw variants and is positioned at the mid-to-premium price tier. Croma provides clinical training materials alongside product documentation. UK practitioners should request the CE-marked IFU version applicable to the UK conformity marking requirements post-2025.

Aptos

Aptos is a Georgian-origin brand that claims a significant role in the early development of barbed suture lift techniques in the early 2000s. The Aptos range sits at the premium end of the UK market and includes proprietary cog geometries and needle configurations not found in standard ranges. Training with an Aptos-accredited trainer is generally recommended before purchasing the barbed product lines. Refer to the Aptos IFU for current specifications.

For a full stock listing, see the PDO threads collection or browse the full product catalogue.

Training and Qualification Requirements

PDO thread procedures sit within the category of non-surgical aesthetic treatments that have been the subject of increasing regulatory attention in the UK since the 2021 Health and Care Act and subsequent Scottish and English licensing frameworks. Practitioners purchasing threads from Longeva Pharmacy are required to hold appropriate clinical qualification and training for the procedures they intend to perform.

The Joint Council for Cosmetic Practitioners (JCCP) publishes qualification and competency standards for aesthetic practitioners, including thread lifting. Practitioners who are not currently on the JCCP register should review the registration criteria and consider whether JCCP membership is appropriate for their practice.

The British College of Aesthetic Medicine (BCAM) provides guidance on practitioner competency standards and patient safety frameworks relevant to aesthetic practice in the UK. BCAM's published position on practitioner qualification can be found at bcam.ac.uk. While this page addresses dermal fillers, BCAM's overarching standards on practitioner qualification and patient assessment apply equally to thread procedures.

Thread lifting carries a higher technical demand than many injectable treatments. Practitioners should undertake hands-on training specifically covering the geometry and indication they plan to use before placing a clinic order. Cadaveric or model training for cog threads is strongly recommended given the depth of insertion and anatomical structures involved.

Patient Selection and Contraindications

Appropriate patient selection is as important as correct thread choice. The following are general principles; practitioners must refer to the specific IFU for the thread product being used and exercise individual clinical judgement for each patient.

Good candidates generally include:

• Patients with mild to moderate skin laxity who are not candidates for or do not want surgical intervention.
• Patients with realistic expectations who have been counselled that thread outcomes are incremental and not equivalent to surgical lift.
• Patients with good skin elasticity relative to their degree of laxity (biostimulation procedures are limited in very thin or severely photo-damaged skin).

Relative and absolute contraindications (non-exhaustive, always check IFU):

• Active skin infection or inflammation in the treatment area.
• Autoimmune conditions affecting wound healing or collagen synthesis.
• Anticoagulant therapy (assess bleeding risk; this is not an absolute contraindication in all cases but requires individual risk assessment).
• Unrealistic expectations or significant body dysmorphic features on assessment.
• Pregnancy or breastfeeding.
• Previous facial surgery with altered anatomy in the treatment zone.
• Known allergy or sensitivity to PDO, PLLA or PCL polymers.

Thorough photographic documentation before and after treatment is good clinical practice and essential for audit and complaint management.

Buying Considerations for a Clinic

Before placing a thread order, the following questions are worth working through:

• Geometry audit: Which geometry do you have confirmed training for? Order only within that scope. Expanding to cog threads before mono threads are used confidently increases clinical risk.
• Gauge selection: Match the gauge to the tissue plane and indication, not to the lowest available unit cost. A 29G is not interchangeable with a 27G in a high-risk anatomical area.
• Needle length: Verify needle length against the treatment area. The IFU will specify appropriate insertion depths; these differ by brand and geometry.
• Pack sizes: Most threads are supplied in sterile blister packs of 10 or 20. Ordering smaller quantities on initial procurement allows for clinical protocol development before committing to bulk stock.
• CE / UKCA marking: Post-Brexit conformity marking requirements mean UK-marketed medical devices should carry UKCA marking or fall under a transitional arrangement. Confirm with your supplier that the product carries appropriate UK conformity documentation.
• Cold chain and storage: PDO threads do not require refrigeration but must be stored below the temperature ceiling stated in the IFU (typically 25 degrees Celsius), away from moisture and direct light. Check your storage environment before ordering volume.
• Complementary products: Thread procedures are often combined with biostimulators, hyaluronic acid filler or skin booster treatments in the same treatment session or programme. See the dermal fillers collection for compatible products.

Key Takeaways

• Thread geometry (mono, cog, screw) determines mechanism of action. Select geometry to match the clinical indication before choosing a brand.
• PDO is the most established polymer. PLLA and PCL offer longer absorption timelines and may be appropriate additions once PDO protocols are mature.
• Mono threads produce biostimulation only. Cog threads produce mechanical lift via barb anchoring. Screw threads produce concentrated collagenesis with mild volumisation.
• Hands-on training specific to the geometry and indication is required before clinical use. JCCP registration and BCAM competency frameworks set the standard for UK practitioners.
• Patient selection, realistic expectation setting, and contraindication screening are clinical responsibilities that no thread product can substitute for.
• Audit your gauge range, needle length and conformity marking before ordering. Smaller initial orders allow protocol refinement before bulk procurement.

References

• Joint Council for Cosmetic Practitioners (JCCP): Practitioner Register and Standards
• British College of Aesthetic Medicine (BCAM): Practitioner Qualification Guidance
• HansBiomed Corporation: Mint PDO Thread Instructions for Use (current edition, available from authorised UK distributor)
• Croma Pharma GmbH: Croma PDO Thread Instructions for Use (UK UKCA-marked edition)
• Aptos International: Aptos Thread Instructions for Use (current edition, available from authorised UK distributor)
• Published evidence on thread lift outcomes: a qualitative review of the peer-reviewed literature indicates incremental soft tissue repositioning and biostimulation effects consistent with the mechanism described above. Practitioners are encouraged to search PubMed for current systematic reviews using the term "PDO thread lift outcomes" and to apply their own critical appraisal. No specific PMC identifiers are cited here as URL stability cannot be confirmed at time of writing.

Reviewed for clinical accuracy under the supervision of our Superintendent Pharmacist, Alicia Barker (GPhC 2241860). Longeva Pharmacy is a GPhC-registered pharmacy (registration 9012378) operating under MHRA WDA(H) licence 59619. Information is intended for licensed UK practitioners and does not replace individual clinical judgement.