Veterinary Suture Material & Needle Reference
Reference for absorbable and non-absorbable suture materials, USP sizing conventions, and needle type selection in veterinary surgery.
Absorbable materials
| Material | Structure | Profile | Common use |
|---|---|---|---|
| Poliglecaprone 25 (e.g. Monocryl) | Monofilament, synthetic | Fast-absorbing (loses tensile strength quickly), low tissue reactivity | Subcuticular/skin closure, soft tissue where fast absorption is desired |
| Polydioxanone (e.g. PDS II) | Monofilament, synthetic | The longest-lasting/slowest-absorbing common suture, retains tensile strength for weeks | Fascia, linea alba, and other tension-bearing closures |
| Polyglyconate (e.g. Maxon) | Monofilament, synthetic | Similar profile to PDS - long-lasting, good for tension-bearing tissue | Tension-bearing tissue |
| Polyglactin 910 (e.g. Vicryl) | Braided, synthetic | Moderate absorption over roughly 60-90 days, excellent handling and knot security | General soft tissue, ligatures, subcutaneous closure |
| Surgical Gut (plain or chromic) | Natural | Largely replaced by synthetics due to higher tissue reactivity; chromic gut lasts longer than plain gut | Legacy use where synthetics are unavailable |
Non-absorbable materials
| Material | Structure | Profile | Common use |
|---|---|---|---|
| Nylon (e.g. Ethilon) | Monofilament, synthetic | Low tissue reactivity | Skin closure (removed at recheck) |
| Polypropylene (e.g. Prolene) | Monofilament, synthetic | Very low tissue reactivity, slides through tissue easily | Vascular/cardiac work, continuous patterns, purse-string sutures |
| Silk | Braided, natural | Excellent handling but notably higher tissue reactivity and a "wicking" risk that can carry bacteria along the braid | Generally reserved for short-term use or ligatures |
| Braided Polyester | Braided, synthetic | Good handling and strength retention | Used where a permanent braided suture is needed |
| Stainless Steel Wire | Monofilament, metal | Maximum strength and permanence | Orthopedic closures (sternotomy, tendon repair) |
Sizing guide (USP scale)
Larger numbers with zeros (2-0, 3-0, 4-0, 5-0, 6-0) indicate progressively thinner suture - more zeros means finer. General rule of thumb by use: fine work (feline skin, ophthalmic) typically 5-0 to 6-0; routine skin and subcutaneous closure typically 3-0 to 4-0; fascia/linea alba closure typically 0 to 2-0; heavy fascia or orthopedic tension-bearing repairs typically size 0 or larger (#1, #2). Always confirm against the specific procedure's requirements - this is a general orientation guide, not a substitute for surgical training.
Needle types
| Needle | Cross-section | Best for |
|---|---|---|
| Cutting Needle | Triangular, cutting edge on the INSIDE curve | Cuts efficiently through tough tissue like skin, but can cut out/tear if used on delicate tissue |
| Reverse Cutting Needle | Triangular, cutting edge on the OUTSIDE curve | Less likely to cut out through the incision edge than a standard cutting needle - the preferred cutting-style needle for skin closure |
| Taper/Round Needle | Round, no cutting edge - pushes through tissue rather than cutting it | Soft tissue like fascia, GI tract, bladder, and subcutaneous tissue, minimizing the risk of a leak or tear along the needle track in hollow organs |
Material and needle choice ultimately depends on tissue type, tension, contamination risk, and surgeon preference - this reference is a starting orientation, not a substitute for surgical training.
Frequently asked questions
What does the "0" in suture sizing mean, and why does more zeros mean thinner?
The USP sizing scale runs from large numbers for thick sutures down through 0, then into 2-0, 3-0, 4-0 etc. for progressively finer diameters - more zeros in the "X-0" notation means a thinner suture, so 5-0 is finer than 3-0.
When would you choose a taper/round needle over a cutting needle?
For soft, easily penetrated tissue like bowel, bladder, or fascia, where a cutting edge isn't needed and could actually create an unwanted leak point along the needle track - taper needles push tissue fibers aside rather than cutting them.
Why is silk rarely used for skin closure anymore?
Its braided structure has higher tissue reactivity and can "wick" bacteria along the braid into the wound, increasing infection risk compared to modern monofilament options like nylon.
What's the difference between Monocryl and PDS in terms of how long they last?
Monocryl is a fast-absorbing suture that loses tensile strength relatively quickly, suited to subcuticular or fast-healing tissue, while PDS is one of the longest-lasting absorbable sutures, retaining strength for weeks - making it the better choice for tension-bearing closures like fascia.