Surgical mesh is a medical device, typically a flexible sheet of synthetic or biological material, used to reinforce weakened or damaged tissue during surgery. It is most commonly implanted during hernia repairs, where it acts as a scaffold that supports the surrounding tissue while the body heals. Roughly a million hernia repairs are performed in the U.S. each year, and the majority involve some form of mesh.
How Surgical Mesh Works in the Body
Once implanted, mesh doesn’t simply sit in place like a patch on a tire. It triggers a biological process in which your body’s own cells gradually grow into and around the material. Immune cells and tissue-building cells called fibroblasts migrate through the tiny pores in the mesh, laying down collagen that binds the mesh to the surrounding tissue. Over time, the mesh becomes integrated into your body’s own structure, creating a reinforced layer that is stronger than the original tissue alone.
The size of those pores matters. They need to be large enough for cells to infiltrate and for new blood vessels to form, which helps prevent infection. If the pores are too small, the body tends to wall off the mesh with dense scar tissue rather than integrating it, which can lead to stiffness and discomfort. This balance between tissue integration and scar formation is one of the central challenges in mesh design.
Materials: Synthetic vs. Biologic
Most surgical mesh is made from synthetic polymers, with polypropylene being the most widely used. Polyester and a material called ePTFE (a form of Teflon) are also common. These synthetic meshes are durable, relatively inexpensive, and can be manufactured with precise pore sizes and weights.
Biologic mesh is made from processed animal tissue, usually derived from pig skin or cow tissue. The living cells are removed, leaving behind a collagen framework that the body can remodel over time. Biologic mesh is often chosen for situations where infection risk is higher, since synthetic materials are more prone to harboring bacteria. One commercially available biologic mesh uses porcine dermal tissue coated with antibiotics to further reduce infection risk.
There are also composite meshes that combine synthetic and biologic materials, and absorbable meshes designed to break down in the body over months as your own tissue takes over the structural role. Non-absorbable mesh stays permanently in the body. The choice between them depends on the location and size of the repair, the patient’s infection risk, and how much long-term reinforcement the tissue needs.
Lightweight vs. Heavyweight Mesh
Mesh products are broadly classified by their weight per square meter. Lightweight meshes weigh 60 grams per square meter or less, with a typical weight around 39 g/m². Heavyweight meshes weigh more than 70 g/m², with a typical weight around 88 g/m². The difference isn’t just about mass: it reflects pore size, flexibility, and how much foreign material is left in the body.
Lightweight meshes generally have larger pores (median around 1.6 mm) and are more flexible, which makes them more comfortable for the patient and may reduce the feeling of stiffness after surgery. Heavyweight meshes have smaller pores (median around 1.0 mm) and provide more rigid support. Surgeons choose between them based on the specific repair needed. A large abdominal wall defect might call for a heavier mesh, while a smaller groin hernia might do well with a lightweight option that allows more natural movement.
Where Mesh Is Used
Hernia repair is by far the most common application. Hernias occur when an organ or tissue pushes through a weak spot in the surrounding muscle or connective tissue. Because hernias have a high likelihood of recurring after surgery, mesh significantly reduces that risk by reinforcing the repair site. It can be placed during both open surgery and laparoscopic (minimally invasive) procedures.
The most frequent hernia types treated with mesh include inguinal hernias (in the groin), ventral and incisional hernias (in the abdominal wall, often at the site of a previous surgical incision), and hiatal hernias (where the stomach pushes up through the diaphragm). Mesh has also been used in reconstructive surgeries and in procedures to support pelvic organs.
Complications and Risks
Most mesh implants function without serious problems, but complications do occur. The known risks include infection at the implant site, fluid buildup (seroma or hematoma), chronic pain, and the body mounting a foreign body reaction against the mesh material.
Two complications deserve particular attention: erosion and migration. Migration happens when the mesh shifts from its original position over time. Erosion occurs when the mesh gradually wears into an adjacent organ, such as the intestine or bladder. When erosion happens, it can cause infection, abscess, fistula (an abnormal connection between organs), or bowel obstruction. One study found that about 3% of patients who received a mesh plug for hernia repair experienced complications from the plug migrating. These complications tend to develop years after the original surgery, which means they can be difficult to connect to the mesh at first.
Chronic pain is perhaps the most discussed risk. Some patients experience persistent discomfort at the mesh site that lasts months or years after surgery. This can result from nerve entrapment during the procedure, excessive scar tissue forming around the mesh, or the mesh itself contracting over time and pulling on surrounding tissue.
The FDA and Transvaginal Mesh
Surgical mesh drew significant public attention due to problems with a specific application: transvaginal mesh used to treat pelvic organ prolapse, a condition where pelvic organs drop from their normal position. Thousands of women reported serious complications including chronic pain, mesh erosion through vaginal tissue, infection, and bleeding.
In 2019, the FDA ordered manufacturers to stop selling mesh devices intended for transvaginal repair of pelvic organ prolapse in the United States. The agency concluded that the benefits did not outweigh the risks for this specific use. Mesh is still approved for abdominal approaches to pelvic organ prolapse repair, such as sacrocolpopexy (where mesh is placed through the abdomen rather than the vagina). The FDA continues to monitor outcomes for women who already have transvaginal mesh implants. This order did not affect mesh used for hernia repair, which remains standard practice.
Antimicrobial Coatings on Modern Mesh
Infection is one of the most serious mesh complications because bacteria can colonize the implant’s surface, making the infection extremely difficult to treat without removing the mesh entirely. To address this, newer mesh products incorporate antimicrobial coatings that release antibiotics or antiseptic agents directly at the implant site.
One commercially available option uses an ePTFE mesh loaded with chlorhexidine (an antiseptic) and silver carbonate, which release quickly after implantation in a burst designed to kill bacteria during the critical early healing window. Another product uses a biologic mesh coated with two antibiotics for a similar purpose. Researchers are also developing polymer coatings that release antibiotics more slowly and steadily over time, with the release rate adjustable based on the polymer’s composition. These coatings aim to prevent infection without interfering with the tissue integration process that makes the repair successful.