PDS suture is a synthetic, absorbable surgical thread made from polydioxanone, a biodegradable polymer. It comes as a single strand (monofilament) and is designed to hold wounds together for an extended period before the body gradually breaks it down and absorbs it. Manufactured by Ethicon, PDS II is one of the most widely used slow-absorbing sutures in surgery today.
What PDS Suture Is Made Of
The “PDS” stands for polydioxanone suture. Polydioxanone is a colorless, crystalline polymer created by linking together repeating units of a compound called p-dioxanone. The result is a flexible, smooth thread that slides through tissue with relatively little friction. Because it’s a monofilament (a single strand rather than braided fibers), it causes less tissue irritation and creates less drag when being pulled through skin, muscle, or fascia.
The body breaks PDS down through hydrolysis, meaning water molecules gradually cleave the polymer chains apart. This process happens in two stages: first, water attacks the less organized regions of the fiber, then it works on the more crystalline, tightly packed areas. The entire suture mass is fully absorbed in roughly 180 to 210 days, though it stops providing meaningful wound support well before that point.
How Long It Holds Its Strength
The defining feature of PDS is how slowly it loses its grip. At two weeks after placement, the suture still retains about 80% of its original tensile strength. At four weeks, it holds roughly 70%, and at six weeks it’s still at about 60%. This prolonged strength profile is the main reason surgeons reach for it: when a wound needs support for more than a few weeks, PDS keeps working long after faster-absorbing alternatives have weakened.
The European Hernia Society, for example, recommends slowly absorbable sutures like PDS for closing abdominal wall fascia. The abdominal fascia (the tough connective tissue layer that holds your core together) does most of its initial healing in the first three weeks, but complete remodeling at the cellular level can take up to a year. A suture that maintains half its strength at six weeks bridges that critical early healing window without the drawbacks of permanent stitches, which can cause sinus tracts, palpable knots under the skin, and ongoing wound pain.
How PDS Compares to Other Absorbable Sutures
Three absorbable sutures come up most often in surgical decision-making: PDS, Vicryl (polyglactin 910), and Monocryl (poliglecaprone 25). They occupy very different niches.
- Vicryl is a braided suture that loses about 50% of its tensile strength within two to three weeks. It’s a workhorse for tissues that heal quickly, like mucous membranes or subcutaneous layers, but it weakens too fast for slow-healing structures.
- Monocryl starts out with the highest breaking strength of the three, actually surpassing PDS initially. But it drops off steeply, losing 70% to 80% of that strength within the first two weeks. It’s fully absorbed in 90 to 120 days. Monocryl works well for skin closure and soft tissue where early strength matters more than long-term support.
- PDS sits at the other end of the timeline. It retains about 50% of its strength at five to six weeks, making it the go-to choice when extended wound support is the priority.
Slowly absorbable options like PDS also have a practical advantage over permanent (non-absorbable) sutures. Because PDS eventually disappears, patients don’t experience the chronic irritation, stitch abscesses, or hard knots under the skin that can occur with permanent materials like nylon or polypropylene in certain locations.
Where Surgeons Use PDS
PDS is particularly useful wherever tissue heals slowly or needs prolonged mechanical support. Abdominal wall closure is one of its most common applications. A meta-analysis published in Annals of Surgery Open found that closing laparotomy incisions with slowly absorbable sutures like PDS, using a continuous small-bites technique, produced better outcomes than using large bites or non-absorbable materials.
Orthopedic procedures, tendon repairs, and fascial closures throughout the body are other frequent uses. In pediatric cardiovascular surgery, PDS has a specialized role: because it absorbs over time, suture lines can expand as a child’s heart and blood vessels grow. Permanent sutures in a growing child’s cardiovascular system would eventually become restrictive. PDS has been used in pediatric cardiac operations since the early 1980s for exactly this reason.
That said, PDS has limits. Its safety and effectiveness have not been established for use in adult cardiovascular tissue, neural tissue, or microsurgery, according to Ethicon’s own product labeling.
Handling and Knot Security
Because PDS is a monofilament, it’s inherently slipperier than braided sutures. Monofilaments glide through tissue more easily, which is an advantage during placement, but they also have more “memory,” meaning the suture tends to spring back toward its packaged coil shape. This can make tying knots trickier.
Knot security with PDS typically requires three to four throws for a surgeon’s knot, depending on the suture size. Research has shown that the Aberdeen knot configuration performs particularly well with PDS II, needing only three throws with one to two turns for a secure hold. Sliding knots, on the other hand, are less reliable with PDS in smaller sizes, as they’re more prone to untying with fewer throws.
For surgeons, these handling quirks are manageable trade-offs. The low tissue drag and minimal inflammatory response of a monofilament generally outweigh the extra attention needed during knot tying, especially in contaminated wounds where a braided suture’s woven structure could harbor bacteria.
What to Expect as a Patient
If your surgeon used PDS sutures, you won’t need to have them removed. The stitches dissolve on their own over several months. You may feel or see the suture material during the first few weeks, especially if it’s close to the skin surface, but it gradually softens and breaks down as your tissue heals around it.
Because PDS maintains its strength for six weeks or more, it provides a longer safety net during recovery compared to faster-absorbing alternatives. This is especially relevant after abdominal surgery, where activities like coughing, sneezing, or standing up put stress on the incision. The extended support window gives the fascia time to rebuild its own structural integrity before the suture hands off the load entirely.