Polyamide mesh study suggests equine flank tolerance
Bottom line
Researchers in Brazil report that a handmade polyamide surgical mesh, placed over the external abdominal oblique muscle in the flank of six healthy horses, was well tolerated through 60 days of clinical and ultrasound follow-up and six months of histopathology. The study, published in Ciência Rural in 2025, found no hematologic or fibrinogen changes, no visible signs of wound infection or implant rejection, and evidence that the mesh became surrounded by organized fibrous tissue rather than provoking a severe adverse response. The investigators used a 5-by-5 cm mesh made from sterilized polyamide fishing line, positioning it in the subcutaneous tissue without incising the abdominal muscles, as an early biocompatibility test for possible future hernia applications. (scielo.br)
Why it matters: For equine veterinarians, the finding is less about an immediately practice-ready hernia repair and more about whether a lower-cost implant material might eventually expand options in cases where commercial mesh is expensive or difficult to use. That matters because mesh-based herniorrhaphy in horses has historically carried meaningful complication concerns, including infection, adhesions, drainage, longer recovery, and, in some reports, worse postoperative burdens than primary repair alone. This study suggests polyamide may be biocompatible in subcutaneous placement, but it was small, used only healthy horses, and did not test actual hernia repair or ventral abdominal use. (scielo.br)
What to watch: The next meaningful step will be whether researchers test this mesh in clinical hernia repairs, especially ventral abdominal defects, where complication risk and real-world surgical performance can be judged. (scielo.br)
Key facts
- Study type
- Early biocompatibility study
- Species
- Six healthy horses
- Implant
- Handmade polyamide surgical mesh
- Mesh size
- 5-by-5 cm
- Material source
- 0.30 mm polyamide fishing line
- Placement
- Subcutaneous tissue over the external abdominal oblique muscle in the flank
- Follow-up
- 60 days clinical and ultrasound, six months histopathology
- Main finding
- No hematologic or fibrinogen changes, and no visible wound infection or implant rejection
- Histology
- Organized fibrous tissue with fibroblast proliferation, neovascularization, and macrophage-predominant infiltrate
A small Brazilian study is drawing attention to a familiar equine surgery problem: how to reinforce the abdominal wall without triggering the complications that can come with implanted mesh. In the new report, investigators found that a handmade polyamide surgical mesh implanted over the flank musculature of six healthy horses caused no obvious local rejection, no systemic inflammatory signal on routine bloodwork, and no wound complications during the study period. (scielo.br)
The work speaks to a long-running tension in equine hernia surgery. Mesh can provide needed support when tissue closure is under tension or defects are large, but horses have also shown notable postoperative risks with implanted materials. Prior equine literature and commentary describe concerns including infection, drainage, adhesions, recurrent colic, prolonged hospitalization, and delayed return to activity, while some surgeons have reported better outcomes with primary repair alone in selected cases. At the same time, mesh remains part of the armamentarium for difficult defects, and surgeons continue to refine where and how they place it. (scielo.br)
In this study, the researchers created a 5-by-5 cm checkerboard mesh by hand from 0.30 mm polyamide fishing line, sterilized it in an autoclave, and implanted it in the subcutaneous tissue over the external abdominal oblique muscle in the flank region. The horses were monitored with serial blood counts, plasma fibrinogen testing, daily wound checks early on, and ultrasound through 60 days, with tissue sampling for histopathology at six months. According to the paper, the horses showed no edema, erythema, pain, increased temperature, or secretion at the implant site, and all skin wounds healed by first intention. Ultrasound showed the mesh remained in position, and later histopathology found fibrous connective tissue, fibroblast proliferation, neovascularization, and a macrophage-predominant mononuclear infiltrate consistent with healing and implant integration rather than overt rejection. (scielo.br)
The authors position cost as part of the story. They note that commercially available synthetic meshes can be expensive, while polyamide is inexpensive, broadly available, nonabsorbable, and already familiar in veterinary surgery as a suture material. Their conclusion is cautious: the mesh appeared safe in equine subcutaneous tissue and may have potential as support for future herniorrhaphy, but more work is needed before extending that claim to clinical hernia repair. They specifically propose testing on the ventral abdomen, which would be a much more clinically relevant and demanding setting. (scielo.br)
Outside commentary in the equine literature helps frame why that caution matters. Recent Equine Veterinary Education commentary notes that mesh hernioplasty in horses has been associated with more postoperative complications and longer recovery in some prior series, even as onlay techniques and material choices continue to evolve. Reporting aimed at horse clinicians has also highlighted that incisional hernias are a recognized complication after abdominal surgery, making any lower-cost, better-tolerated reinforcement option potentially relevant if it proves effective in real defects, not just tolerated in healthy tissue. (pubs.aaep.org)
Why it matters: For veterinary professionals, this is an early biocompatibility signal, not a practice-changing surgical recommendation. The study suggests polyamide mesh may be biologically quiet enough for equine use in a subcutaneous plane, which could be important in resource-sensitive settings or where access to commercial implants is limited. But the limitations are substantial: only six horses were studied, there was no comparison group, the implant was not used to repair a hernia, and the material was placed in the flank subcutis rather than in the higher-stress, contamination-prone, adhesion-sensitive environments that often define real equine abdominal wall surgery. In other words, the study answers, “Can horses tolerate this material here?” more than, “Should clinicians use this mesh for hernia repair now?” (scielo.br)
That distinction matters for case selection and client communication. Pet parents facing hernia repair decisions in horses often want durable solutions and predictable recovery, but the equine literature shows that mesh decisions are rarely simple. Surgeons weigh defect size, tissue quality, contamination risk, available materials, cost, and the consequences of implant-related complications. A low-cost polyamide option could eventually be useful, especially if it supports fibrovascular incorporation without excessive inflammation, but clinicians will likely want controlled comparisons against established meshes and real surgical outcome data before changing protocols. This is an inference based on the study’s design and the broader literature on equine mesh complications. (scielo.br)
What to watch: The next milestone will be translational follow-up, ideally controlled studies in clinical hernia cases or experimentally created abdominal wall defects, with attention to infection rates, recurrence, adhesion risk, recovery time, and performance under ventral abdominal load. Until then, this study is best read as promising groundwork rather than a new standard of care. (scielo.br)