The vertical mattress suture is a skin closure technique that passes through tissue twice on each side of a wound, creating a loop that grabs both deep and superficial layers in a single stitch. Its signature advantage is wound edge eversion, the slight outward rolling of skin edges that promotes flat, less-visible healing. Surgeons choose it when a wound is under tension, when the skin tends to invert, or when they need a strong closure without placing a separate deep stitch. But the technique comes with real trade-offs in cosmetic outcome, infection risk, and patient comfort that make it a deliberate choice rather than a default one.
How the Stitch Works
A standard vertical mattress suture involves two passes through the skin. The first pass, sometimes called the “far” bite, enters the skin several millimeters from the wound edge, travels deep under the wound, and exits at the same distance on the opposite side. The needle is then reversed for the second pass, the “near” bite, which enters and exits much closer to the wound edge and travels through only the superficial dermis. When the suture is tied, the deep bite pulls the wound edges together while the shallow bite lifts them upward, producing that characteristic eversion.
The geometry matters more than you might expect. An in vitro study testing pig gingiva and mucosa found that varying the distance of insertion points from the wound margin, and adjusting the bite size, directly influenced how much pulling force a vertical mattress suture could withstand before tearing through tissue.1PubMed. The distance of insertion points from wound margins in interrupted and vertical mattress sutures influences the tensile load capacity In practical terms, taking wider bites increases holding strength, but also increases the amount of tissue being compressed under the suture, which can affect blood supply and healing.
Why Eversion Matters for Scarring
When a wound heals, skin edges that sit perfectly flat against each other tend to contract inward slightly as the scar matures. That inversion creates a depressed, more visible scar. Wound edge eversion compensates for this: the slightly raised edges gradually flatten over weeks to months, leaving a scar that sits level with the surrounding skin. The vertical mattress suture is one of the most reliable ways to achieve this eversion, which is why it remains a go-to technique despite being slower to place than simpler alternatives.2PubMed Central. The shorthand vertical mattress stitch: evaluation of a new suture technique The technique also allows wound edges to be closed under tension when they need to be brought together over a distance, a scenario where simpler sutures might pull through or leave gaps.3PubMed Central. The mattress sutures: vertical, horizontal, and corner stitch
Strength Compared to Simple and Horizontal Mattress Sutures
One of the practical reasons surgeons pick the vertical mattress is raw holding power. In a study measuring maximum pulling force across several suture patterns, the vertical mattress withstood roughly 7.25 newtons before failing, compared to about 5.7 newtons for a simple interrupted suture. The horizontal mattress was slightly stronger still, at about 8.1 newtons.4PubMed. Measuring Forces in Suture Techniques for Wound Closure So the vertical mattress sits in a middle ground: stronger than a simple stitch, not quite as strong as a horizontal mattress, but with better eversion properties than either.
That extra strength comes from the double pass through tissue. The deep bite anchors into the subcutaneous layer, distributing tension across a larger tissue volume. The superficial bite, meanwhile, keeps the skin edges properly aligned without relying entirely on the deeper loop. This two-level purchase is what makes the technique useful for wounds on the extremities, the scalp, or the back, where skin tension is high and simple sutures might cut through.
When Surgeons Reach for It
The vertical mattress suture shows up across a wide range of surgical specialties, but certain situations call for it more than others. Wounds under high tension, areas with thick skin, lax tissue that tends to invert, and situations where a surgeon wants to avoid placing a separate buried dermal suture are all common indications. In orthopedic surgery, it’s frequently used to close incisions over joints where the skin is constantly being stretched by movement.
In total knee replacement, a clinical trial compared several closure techniques and found that a modified buried vertical mattress suture produced the best scar scores and highest patient satisfaction, even outperforming subcuticular closure.5PubMed. The Effect of Three Suture Techniques for Closure of Total Knee Arthroplasty: A Clinical Trial Study A separate prospective study comparing vertical mattress nylon sutures to staples in hip and knee arthroplasty found no significant difference in wound complications or patient satisfaction between the two methods.6PubMed. Staples versus sutures wound closure in hip and knee arthroplasty: a prospective cohort study That study’s authors concluded the choice should come down to available resources rather than a clear clinical winner.
The technique also sees use in oral and maxillofacial surgery, where tissue planes are complex and the soft tissue around extraction sites can be difficult to close neatly. And in veterinary surgery, the vertical mattress has proven viable for closing the abdominal wall in horses after laparotomy, where the forces on the incision line are enormous.7PubMed. Complications associated with closure of the linea alba using a combination of interrupted vertical mattress and simple interrupted sutures in equine laparotomies
The Cosmetic Trade-Off
Here is where the vertical mattress suture’s reputation gets complicated. While the eversion it produces reduces the risk of a depressed scar, the suture itself leaves more marks on the skin than techniques that run within the dermis. Each interrupted vertical mattress stitch creates four puncture points, two on each side, and if the suture stays in too long or is tied too tightly, those puncture sites can leave permanent “railroad track” marks perpendicular to the wound.
For cosmetically sensitive areas, subcuticular and intradermal techniques consistently outperform the vertical mattress on scar-appearance scores. In a study of cesarean section closures, patients who received an intradermal buried suture reported significantly better scores for scar color, stiffness, and thickness compared to those who had a standard subcuticular closure.8PubMed Central. Cosmetic outcomes of cesarean section scar; subcuticular suture versus intradermal buried suture In inguinoscrotal surgeries, the subcuticular group had substantially better cosmetic scores than either simple interrupted or vertical mattress closures.9International Journal of Medical and Pharmaceutical Research. A Comparative Study Between Vertical Mattress and Subcuticalar Sutures In Inguinoscrotal Surgeries
A study of spinal surgery incisions found that a modified Allgöwer-Donati technique, a half-buried variant that avoids passing the suture through the epidermis on one side, reduced wound scarring compared to standard vertical mattress sutures in nearly 59% of patients.10PubMed Central. Effect of Modified Allgöwer–Donati Suture Technique on Wound Cosmetics in Spinal Surgery This suggests that the cosmetic penalty of the vertical mattress is partly about the surface puncture points, not just the technique’s tension characteristics. Modifications that reduce epidermal penetration can narrow the gap.
Infection and Wound Complications
The deep pass of the vertical mattress suture is a double-edged feature. It provides strength and eversion, but it also means more foreign material sitting deeper in the tissue, more tissue being compressed, and more potential entry points for bacteria. A prospective study tracking wound complications across suture types found the vertical mattress associated with the highest infection rate at about 14% and dehiscence (wound separation) at about 7%, attributed to the deeper dermal penetration and greater suture tension.11Journal of Contemporary Clinical Practice. Wound Related Complications of Skin Sutures – A Prospective Study
A comparative study of cesarean section closures painted an even starker picture for certain populations. In that trial, wound infection occurred in 24% of the vertical mattress group versus about 3% in the subcuticular group, a roughly sevenfold difference that reached statistical significance.12International Journal of Pharmaceutical Quality Assurance. Comparison of Interrupted Vertical Mattress versus Continuous Subcuticular Sutures for Skin Closure in Elective Caesarean Section The wound dehiscence rate also trended higher in the mattress group, though that difference didn’t reach significance in the sample size studied.
These numbers deserve context. Cesarean sections involve a skin fold area prone to moisture and bacterial colonization, and the patient population often includes risk factors like diabetes and obesity. The complication rates from that specific study shouldn’t be generalized to all uses of the vertical mattress suture. Still, the pattern is consistent across studies: techniques that keep suture material away from the skin surface tend to produce fewer infections. The vertical mattress, by design, puts material through all layers including the epidermis.
One modification that attempts to address this is the Allgöwer-Donati variant, which passes the suture through the full thickness on one side but only catches the dermal layer on the other, reducing the number of skin-surface punctures by half. A meta-analysis comparing the Allgöwer-Donati to the standard interrupted vertical mattress for calcaneal fracture surgery found no statistically significant difference in overall postoperative complication rates between the two techniques.13Joint Diseases and Related Surgery. A meta-analysis of Allgöwer-Donati versus interrupted vertical mattress suturing in preventing postoperative incisional complications of calcaneal fracture surgery So the modification may help cosmetically without clearly reducing complications in high-risk surgical sites.
Blood Flow at the Wound Edge
A concern that often goes unmentioned in basic descriptions of suture techniques is how much a stitch chokes off blood supply to the healing wound edge. A study using laser Doppler flowmetry in a pig model examined how cutaneous blood flow changed as increasing tension was applied through different suture patterns, including simple, vertical mattress, horizontal mattress, and Allgöwer-Donati sutures.14Journal of Orthopaedic Trauma. The Effect of Suture Pattern and Tension on Cutaneous Blood Flow as Assessed by Laser Doppler Flowmetry in a Pig Model The key insight from this line of research is that the relationship between suture tension and blood flow isn’t linear or identical across patterns. The vertical mattress, because it grabs deep tissue, can compress blood vessels in the subdermal plexus more aggressively than a simple suture at the same apparent skin tension. Tying vertical mattress sutures too tightly doesn’t just risk track marks; it risks ischemia at the wound edge, which slows healing and can contribute to necrosis in vulnerable tissue.
This is why experienced surgeons often emphasize tying vertical mattress sutures just tight enough to approximate the wound edges with gentle eversion, not tight enough to blanch the skin. The technique demands more judgment at the tying step than simpler patterns do.
Pain After Vertical Mattress Closure
Patients don’t always think about suture technique, but they notice the pain. Two randomized trials from different surgical contexts point in the same direction: vertical mattress sutures tend to hurt more than simpler alternatives in the early postoperative period. A split-mouth trial after impacted wisdom tooth extraction found significantly lower pain levels and swelling scores with simple interrupted sutures compared to vertical mattress sutures during the first four postoperative days.15PubMed Central. Comparison of Effects of the Interrupted and Vertical Mattress Sutures on Pain, Swelling, and Probing Depth Following Extraction of Impacted Mandibular Third Molars A separate trial comparing the two techniques for palmar hand incisions found higher mean pain in the vertical mattress group, with a statistically significant difference on postoperative day three.16PubMed Central. Simple Suture vs. Vertical Mattress: Choosing the Best Suture for Palmar Incision Based on a Randomized Clinical Trial
The likely explanation is straightforward: the vertical mattress suture grabs more tissue, applies more compression, and creates more inflammation at the suture site. In areas with dense nerve endings like the palm or the oral mucosa, patients feel that difference. The pain gap tends to narrow after the first several days, but it’s worth knowing about if you’re making a shared decision with your surgeon about closure method in a sensitive area.
Variations Worth Knowing About
The “classic” vertical mattress described above is far from the only version in use. Several modifications try to preserve its advantages while addressing its weaknesses.
- Shorthand vertical mattress: This simplified version achieves the same wound eversion in roughly half the placement time as the classic technique, making it practical for emergency departments and situations where speed matters. A study evaluating it on 20 wounds found no infectious complications, delayed healing, or cosmetic problems compared to the traditional method.17PubMed Central. The shorthand vertical mattress stitch: evaluation of a new suture technique
- Allgöwer-Donati: The half-buried variant described earlier, which passes through the full skin thickness on one side but only catches the dermis on the other. It reduces surface puncture marks and may improve cosmetic outcomes, particularly in spinal and lower-extremity surgery.
- Pulley suture: A modification using a “far-near-near-far” pattern that creates a mechanical advantage, allowing the surgeon to close wounds under very high tension without the suture cutting through tissue.18CosmoDerma. Suturing techniques The trade-off is lower absolute breaking strength compared to a standard vertical mattress; the benefit is the ability to bring edges together that would otherwise require undermining or a flap.
- Modified buried vertical mattress: A technique that keeps the knot buried beneath the skin surface, combining the eversion properties of a vertical mattress with the cosmetic profile of a buried stitch. In knee arthroplasty, this variant produced the best scar scores and satisfaction ratings among several closure methods tested.19PubMed. The Effect of Three Suture Techniques for Closure of Total Knee Arthroplasty: A Clinical Trial Study
- Continuous vertical mattress: A running version that speeds up closure of long incisions. A study of a modified continuous adaptive vertical mattress suture in knee arthroplasty found no complications over the entire follow-up period, with wound drainage characteristics comparable to standard continuous closure.20NAUKA MOLODYKH (Eruditio Juvenium). Modification of Continuous Adaptive Vertical Mattress Skin Suture in Knee Arthroplasty
Cost and Operating Time
The vertical mattress suture takes longer to place than most alternatives. Each stitch involves two separate passes through tissue, reloading the needle holder, and careful adjustment of tension before tying. A study comparing reusable skin staples to vertical mattress sutures for midline laparotomy closure found that the staple group finished in an average of about 129 minutes of total operative time, compared to roughly 158 minutes for the suture group, a difference of nearly half an hour.21PubMed Central. Comparative Study of Use of Reusable Skin Staples and Vertical Mattress Sutures in the Closure of Midline Laparotomy Wounds The material cost, however, favored sutures dramatically in that setting: the equivalent of about 26 naira per centimeter for sutures versus 184 naira per centimeter for staples.
In well-resourced settings where staples and subcuticular closure are readily available, the extra time required for vertical mattress placement can be hard to justify on purely cosmetic cases. But in settings where materials are limited or where wound tension makes faster alternatives unreliable, the vertical mattress remains a practical and cost-effective choice. The suture material itself is inexpensive, and the technique requires only a needle holder, forceps, and suture on a cutting needle.
Historical Roots
The vertical mattress suture is often called the “Donati stitch” in European surgical literature, after the Italian surgeon Mario Donati who popularized and systematized the technique in the early twentieth century. A historical review traced the origin of the Donati stitch through eyewitness accounts of his surgical practice and identified a possible precursor in medieval surgical texts, suggesting that the basic principle of a double-pass skin closure has been rediscovered more than once across centuries.22PubMed. Mario Donati and the vertical mattress suture of the skin The technique’s longevity speaks to its utility: it solves a real mechanical problem, wound edge inversion and tension, that no simpler stitch addresses as effectively.
Learning the Technique
For medical students and surgical trainees, the vertical mattress suture is typically one of the first advanced closure techniques taught after the simple interrupted stitch. It requires understanding tissue depth, accurate needle placement at consistent distances from the wound edge on both passes, and a feel for how tightly to tie the knot. Training studies have incorporated 3D-printed wound models to give trainees repeatable practice with the technique before they encounter live tissue.23Scientific Reports. A randomized cohort study on the use of 3D printed models to enhance surgical training in suturing techniques
The most common mistakes beginners make are taking asymmetric bites (entering at a different depth or distance on each side of the wound), tying too tightly and blanching the wound edge, and placing the near bites too far from the wound margin, which defeats the eversion purpose. A well-placed vertical mattress suture should produce gentle eversion without strangulating the tissue between the loops. Getting that right is less about memorizing measurements and more about developing a tactile sense for how tissue responds, which is why simulation and supervised practice are emphasized in training programs.