Suture Materials Comparison

The choice of suture material determines the mechanical performance, tissue interaction, and clinical outcome of a wound closure. Each material has a unique combination of tensile strength, flexibility, surface friction, tissue reactivity, and (for absorbable materials) degradation rate. Understanding these properties at the material level is essential for informed suture selection.

This guide covers the primary suture material categories, with specific reference to Desmo Care's product range. All specifications are typical values under standard USP/EP test conditions.

PGA (Polyglycolic Acid)

Polyglycolic acid is a linear aliphatic polyester first introduced as a surgical suture material in the 1970s. It was the first synthetic absorbable suture and remains the most widely used absorbable material globally. PGA is synthesized by ring-opening polymerization of glycolide, producing a highly crystalline polymer (approximately 46-52% crystallinity) with excellent initial tensile strength.

PGA degrades by hydrolysis of its ester bonds. The high crystallinity results in relatively rapid degradation compared to other synthetic absorbable polymers. PGA sutures (DesmoNex) retain 75% of tensile strength at 2 weeks and 40% at 3 weeks, with complete absorption in 60-90 days.

PGA sutures are manufactured as braided multifilaments and coated to reduce surface friction. DesmoNex uses a polycaprolactone and calcium stearate coating that provides smooth tissue passage while minimizing capillarity. Clinical applications include general soft tissue approximation, fascial closure, peritoneal closure, pediatric surgery, plastic surgery, ophthalmic procedures, and oral surgery.

PDO (Polydioxanone)

Polydioxanone is a polyester synthesized by ring-opening polymerization of p-dioxanone. Its ether-ester backbone gives it greater flexibility and lower crystallinity (approximately 37-55%) compared to PGA, which translates to a longer degradation timeline and extended strength retention.

DesmoPol retains 70% of tensile strength at 2 weeks and 50% at 6 weeks — significantly longer than PGA. Complete absorption occurs at 180-210 days. This makes PDO the material of choice when extended tissue support is needed but permanent fixation is not required.

As a monofilament, PDO suture passes through tissue with minimal drag and does not harbor bacteria in interstices. It produces less tissue reaction than braided absorbable sutures. However, PDO monofilament has moderate “memory” — it tends to retain the coil shape from packaging, which can affect handling. Surgeons typically find that gentle straightening before use addresses this.

Primary applications include pediatric cardiovascular surgery (where growth accommodation is needed), orthopedic soft tissue closure, fascial closure requiring extended support, plastic and reconstructive surgery (subcuticular closure), and general soft tissue approximation where monofilament properties and extended strength retention are desired.

PGLA (Polyglactin 910)

Polyglactin 910 (PGLA) is a synthetic absorbable copolymer of glycolide and lactide. The addition of lactide to the glycolide backbone slows hydrolysis relative to pure PGA and improves pliability, producing a braided suture with excellent handling and knot security.

DesmoCryl retains approximately 75% of tensile strength at 2 weeks and 50% at 3 weeks, providing medium-term tissue support of 28-35 days. Complete absorption by hydrolysis occurs in 56-70 days. It is suited for general soft tissue approximation and ligation, gynecology, urology, gastrointestinal, ophthalmic, and oral surgery procedures.

The rapid version (DesmoCryl Rapid) provides shorter tissue support of 7-10 days with complete absorption in about 42 days, making it ideal for superficial closure, episiotomy repair, circumcision, and oral mucosa where suture removal should be avoided.

As a coated braided material, DesmoCryl offers smooth tissue passage combined with excellent knot security and reliable handling. This makes it one of the most versatile absorbable sutures for general soft tissue approximation across a wide range of specialties.

Polycaprolactone

Polycaprolactone (PCL) is a synthetic absorbable polyester valued for its flexibility and soft, pliable handling. As a monofilament absorbable suture it combines smooth tissue passage with minimal tissue reaction.

DesmoCapro offers high initial strength with gradual loss over time and absorption by hydrolysis. Its soft, pliable character and smooth monofilament surface make it well suited to subcuticular skin closure and procedures where atraumatic handling is a priority.

The monofilament structure ensures minimal tissue reaction and resistance to bacterial colonization. The material produces less inflammatory response than braided absorbable sutures, making it suitable for general soft tissue approximation, subcuticular skin closure, and plastic and reconstructive surgery.

Polypropylene

Polypropylene is a stereo-regular crystalline polyolefin. It is one of the most chemically inert suture materials available — it does not hydrolyze, is resistant to enzymatic degradation, and provokes minimal inflammatory tissue reaction. Its monofilament structure further reduces tissue interaction and bacterial adherence.

DesmoLen maintains its tensile strength permanently in tissue with no degradation over time. This combination of permanent strength, chemical inertness, and monofilament construction makes polypropylene the standard suture material for cardiovascular surgery, where the suture must withstand constant hemodynamic stress while minimizing thrombogenicity at the anastomotic site.

Polypropylene is also used in general soft tissue closure, hernia repair (mesh fixation), and plastic surgery. Its smooth monofilament surface allows easy removal when used for percutaneous skin closure — the suture slides out cleanly without tissue adherence.

The primary handling consideration is that polypropylene has moderate memory and requires careful knot technique. Additional throws (typically 5-6 per knot) are recommended to ensure knot security, as the smooth surface can allow knot slippage if inadequately secured.

Silk (Natural Protein Fiber)

Silk is a natural protein fiber produced by the Bombyx mori silkworm. It is classified as non-absorbable, though it gradually loses tensile strength over 6-12 months in tissue and may eventually be fully degraded by proteolytic enzymes over 1-2 years. Clinically, it is treated as non-absorbable because it is not reliably eliminated and typically requires removal in external applications.

DesmoSilk is widely regarded as the gold standard for suture handling. Its braided construction provides exceptional pliability, precise knot placement, and high knot security — silk holds knots more reliably than any other suture material with fewer throws required. These handling properties make it the preferred suture for procedures demanding fine motor control, particularly ophthalmic and microsurgical applications.

The trade-off is tissue reactivity. Silk provokes a greater inflammatory response than synthetic materials, which can lead to encapsulation of the suture by granulation tissue. This makes silk less suitable for permanent implantation in deep tissue and inappropriate for use in contaminated or infected wounds where the braided structure could harbor bacteria.

Clinical applications include general surgery (ligatures, wound closure), ophthalmic surgery (tarsorrhaphy, strabismus), oral surgery, and any application where the suture will be removed after initial healing and where handling precision outweighs concerns about tissue reactivity.

Nylon (Polyamide)

Polyamide (nylon) is a synthetic non-absorbable polymer offering high tensile strength, elasticity, and a smooth monofilament surface with minimal tissue reaction. Although classified as non-absorbable, nylon undergoes very slow hydrolysis over a period of years.

DesmoMid combines high elasticity with smooth tissue passage, making it a workhorse for skin closure and general soft tissue approximation. Its fine-gauge range (down to 11/0) makes it a standard choice for ophthalmic and microsurgical procedures requiring extremely fine, strong sutures.

Primary applications include skin closure, general soft tissue approximation, plastic and cosmetic surgery, and ophthalmic and microsurgery. The monofilament structure resists bacterial adherence and slides cleanly through tissue, allowing easy removal in percutaneous skin closure.

Polyester (Polyethylene Terephthalate)

Polyester (polyethylene terephthalate, PET) is a synthetic non-absorbable polymer offering very high, durable tensile strength. Manufactured as a braided multifilament, it combines strength with excellent knot security and minimal tissue reaction.

DesmoSter provides permanent strength retention and is completely resistant to degradation in tissue. It is available in a wide USP range (7/0 to 5), with the larger gauges used in cardiovascular and orthopedic applications requiring maximum fixation strength.

Primary applications include cardiovascular surgery, heart valve replacement, and tendon and ligament repair. Its durable strength and knot security make it well suited to high-load fixation where permanent support is essential.

As a braided material, DesmoSter offers superior handling and knot tie-down compared with monofilament non-absorbables, with consistent, reliable performance across orthopedic and cardiovascular procedures.

Complete Materials Comparison Table

Frequently Asked Questions