PGA polymer absorbable surgical sutures: properties and medical use

4 octobre 2026

Sterile gauze sponges used for dressing a wound closed with absorbable sutures

PGA - polyglycolic acid, also called polyglycolide - is a synthetic absorbable suture material. It is braided from a glycolide homopolymer, usually coated, and it is broken down by hydrolysis rather than by enzymes, so its loss of strength is reasonably predictable. Its clinical role is soft tissue approximation and ligation where the wound needs support for a few weeks and the suture does not need to come out.

What are the properties of a PGA suture?

PGA sits in the medium-term absorbable family. The material is a homopolymer of glycolide, formed into a braided multifilament thread and coated to reduce drag through tissue, so it handles with more structure than a monofilament.

Property	How it is usually specified	Why it matters at the bench
Chemistry	Homopolymer of glycolide (polyglycolic acid)	Synthetic and consistent, unlike a biological material taken from animal tissue
Construction	Braided multifilament, coated	Good knot security and handling, with coating to help it pass through tissue
Degradation route	Hydrolysis, not enzymatic	Breakdown is a chemical process and is less dependent on the patient's enzyme activity
Colour	Violet or undyed, depending on the range	Violet aids visibility on the field and in the wound
Size designation	USP sizes, for example 6/0 up to 1	Sizing is shared with the US convention, so a pack reads the same way

Manufacturer specifications are the right place to read the numbers, and they differ between ranges. One published PGA range is documented as retaining 75% of its knot tensile strength up to 14 days and 50% up to 21 days, with complete mass absorption between 56 and 70 days.

How long does a PGA suture hold and when is it absorbed?

The useful way to think about an absorbable suture is as a strength curve followed by a mass curve. Strength falls first, while the wound is gaining its own tensile strength; mass disappears later, once the thread has done its job.

Time after implantation	What is happening to the suture	What it means for the wound
First 14 days	Most of the knot strength is still present in the documented range	The closure is holding while early healing takes place
Around 3 weeks	Roughly half the knot strength remains	Support is tapering as the tissue takes over
8 to 10 weeks	Complete mass absorption in the documented range	The thread is gone and no removal step is needed
Beyond that	No residual support from the suture itself	The wound is relying on its own healed tissue

That profile is why PGA is described as medium-term, and why the numbers must come from the specific range's instructions for use.

What is a PGA suture used for?

The manufacturer's stated indication for one PGA range is general soft tissue approximation and ligation across suitable surgery types. In practice that covers closures where a buried absorbable thread is wanted and a removal visit is not: subcutaneous layers, mucosal closures and similar soft tissue work.

There is also randomised evidence on how synthetic absorbable sutures compare with older catgut materials. A Cochrane review of absorbable suture materials for repair of episiotomy and perineal tears found that standard synthetic sutures were associated with less pain up to three days after delivery and less analgesia use up to ten days, and that far more women in the catgut groups needed re-suturing.

How is a PGA suture classified and labelled?

In the United States the FDA classification database lists "suture, absorbable" under product code GAK as a Class II device, with 21 CFR 878.4830 as the regulation and the agency's Class II special controls guidance document for surgical sutures as the special control. Absorbable synthetic sutures made from poly(glycolide/l-lactide) polymers sit under 21 CFR 878.4493.

Detail on the pack	What to check before it goes on a tray
Size designation	The USP size is stated and matches the size the procedure calls for
Lot or batch number	Traceable back to the manufacturer if a thread has to be investigated
Expiry date	Absorbable sutures are supplied in sterile packaging and have a dated shelf life
Packaging integrity	The foil or pouch is intact; a breached pack is a sterility question, not a stock question

A clinic buying for a Canadian practice should treat the suture as a device purchase, not a generic consumable: the polymer named on the pack, the size designation and the lot number are the fields that get asked about after a wound complication. Teams that want their records in one place can start from the printable sterilization log sheet, which covers the load, service, malfunction and package-label fields. The same page also carries a log and package-label generator for clinics that record on screen rather than on paper.

Have a question about your own facility? Send it in and you will get a written answer specific to your setup, with the regulation or standard it is based on cited. Ask your compliance question.

Ordering for a clinic, lab or care home? Wholesale and multi-site ordering covers case pricing and account setup, and the B2B wholesale collection lists the lines stocked for institutional buyers.

Frequently Asked Questions

Is PGA the same as polyglactin 910?

No. PGA is a homopolymer of glycolide. Polyglactin 910 is a copolymer of glycolide and lactide, covered by a separate FDA regulation for absorbable poly(glycolide/l-lactide) sutures.

How long does a PGA suture take to absorb?

For the range documented here, complete mass absorption is given as 56 to 70 days, after the knot strength has already fallen away over the first three weeks. Read the absorption figures from the instructions for use supplied with your product.

Does a PGA suture need to be removed?

No. That is the point of an absorbable material: the thread is broken down by hydrolysis and the wound closes without a removal appointment.

Can any clinic use PGA sutures?

Sutures are used by clinicians trained and authorised to close wounds. A clinic's role in stocking them is usually procurement and storage - keeping the packs in date, in intact sterile packaging, and traceable by lot number.

Why do PGA packs come in different sizes?

Because the size designation, not the material, sets the thread's diameter. A larger USP size is a heavier thread for higher-tension tissue, and a smaller size is a finer thread for delicate work.

Stack of sterile gauze sponges kept with wound closure supplies

CliniEco Medical holds Medical Device Establishment Licence MDEL #35334. This article summarises published specifications and clinical literature for information only; it does not replace the instructions for use supplied with a device, the manufacturer's labelling, or the judgement of the clinician performing the procedure.