PLA Sutures: How Polylactic Acid Is Used in Absorbable Sutures

Polylactic acid (PLA) is rarely named on a suture package, yet it has been part of absorbable suture technology for decades. Polyglactin 910 — the polymer in Vicryl, one of the most widely used absorbable sutures in the world — is a copolymer of glycolide and L-lactide, the same lactide monomer that forms PLA. Understanding how PLA works inside absorbable sutures helps procurement teams and clinicians evaluate products with realistic expectations about strength retention, absorption time, and tissue response.

What Makes a Suture Absorbable

An absorbable suture is a sterile strand that loses tensile strength and is broken down by the body over time, so removal is not required. Degradation happens mainly through hydrolysis: water in tissue cleaves the polymer backbone into smaller fragments that the body metabolizes and excretes.

Most absorbable sutures are built from aliphatic polyesters, including polyglycolic acid (PGA), polyglactin 910 (a PLGA-type copolymer), polydioxanone (PDS), polycaprolactone, and polylactic acid (PLA). Each material has a characteristic degradation profile, and manufacturers blend or copolymerize them to hit a target absorption window.

Where PLA Appears in Modern Sutures

PLA’s role in sutures is usually as a component rather than a standalone material. The clearest example is polyglactin 910: 90% glycolide and 10% L-lactide, sold as Vicryl. The lactide fraction slows the rapid degradation of PGA and extends strength retention. Poliglecaprone 25 (Monocryl) pairs glycolide with epsilon-caprolactone, while PLLA appears in some monofilament and braided designs where longer support is wanted.

In copolymers, PLA’s slower degradation is balanced against PGA’s faster breakdown so the suture holds tissue during early healing and disappears once support is no longer needed. That balance is what lets a single product line cover everything from fast-healing mucosa to slow-healing fascia.

How Suture Degradation Works

Absorbable sutures lose strength before they lose mass. Tensile strength retention curves describe this. Vicryl retains roughly 65–75% of its strength at 14 days, with complete mass loss at 56–70 days. PDS degrades more slowly: about 60% strength at 14 days, with mass loss extending past 180 days.

Absorption timing must match wound healing. Skin and mucosa heal quickly and need short-term support; fascia and tendon closures need weeks of holding strength. A suture that absorbs too fast risks wound dehiscence; one that lingers can cause sinus formation or a palpable knot.

PLA vs PGA vs PHA Sutures

• Strength retention: PGA loses strength quickly; PLA-containing copolymers such as polyglactin 910 hold strength longer; PDS longer still.
• Tissue reaction: PLA degrades to lactic acid, a natural metabolite, and is less acidic than PGA, which may reduce local inflammation.
• Cost and availability: PGA and PLGA sutures are produced at scale and are inexpensive; PHA sutures remain research-stage.
• Regulatory history: PLA-family absorbables have been cleared since the 1970s — Vicryl received FDA clearance in 1974.

What Surgeons and Procurement Consider

Suture selection starts with tissue type and healing time, then infection risk. Antimicrobial-coated options such as triclosan-coated polyglactin 910 are available where surgical site infection is a concern. For procurement, the practical questions are inventory breadth (sizes, needles, braided versus monofilament), supplier reliability, and cost per unit.

Absorbable sutures are a commodity category with mature supply chains, but substitution is not always clinically equivalent — switching brands or materials without review is risky. Around the OR, sustainability now extends to adjacent disposables: CliniEco’s PLA biodegradable isolation gowns and individually wrapped surgical masks bring plant-based materials to everyday surgical support items, and non-woven bouffant caps round out an OR-adjacent inventory. For a broader look at where PLA fits in healthcare, see our guide to polylactic acid in medical applications.

References

1. Pillai, C.K.S.; Sharma, C.P. Absorbable polymeric surgical sutures: chemistry, production, properties, biodegradability, and performance. Journal of Biomaterials Applications, 2010, 25(4), 291–366. DOI: 10.1177/0885328210374895.
2. Conn, J.; Oyasu, R.; Welsh, M.; Beal, J.M. Vicryl (polyglactin 910) synthetic absorbable sutures. American Journal of Surgery, 1974, 128(1), 19–23. DOI: 10.1016/0002-9610(74)80019-2.
3. Ethicon, Inc. Vicryl (polyglactin 910) Suture — FDA clearance, 1974; PDS II (polydioxanone) Suture — FDA clearance, 1981.

Sterile suture trays are only as good as the sterilizer behind them, so a 5-pack biological indicator trial starts the monitoring record.

Related Reading

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• PLA Shoe Covers: Biodegradable Footwear Protection for OR and Clinic
• PLA Bouffant Caps: Compostable Hair Covers for Cleanroom and Clinic
• family practice clinic supplies

Frequently Asked Questions

How long do PLA sutures last?

It depends on the formulation. Polyglactin 910 (Vicryl) loses most of its strength by 21 days and is fully absorbed in 56–70 days. PDS lasts longer, with complete absorption beyond 180 days. PLLA-based monofilaments can persist even longer.

Do absorbable sutures dissolve completely?

Yes. Hydrolysis breaks the polymer into small fragments that are metabolized and excreted. Complete mass loss takes weeks to months depending on the material; nothing is left to remove.

What is Vicryl made of?

Vicryl is made of polyglactin 910, a copolymer of 90% glycolide and 10% L-lactide. The lactide component is the same monomer used to produce PLA.

Last updated: September 2026. CliniEco Medical is a licensed medical device establishment (MDEL #35334).