Abdominal wall reinforcement: biologic vs. degradable synthetic devices

Area of Science:

• Biomaterials Science
• Surgical Innovation
• Regenerative Medicine

Background:

• New biodegradable synthetic and biologic hernia implants are promoted for rapid integration and tissue reinforcement.
• Experimental data supporting these claims in challenging hernia repairs is limited.

Purpose of the Study:

• To evaluate the integration and reinforcement capabilities of synthetic (BioA®) and biologic (Strattice®, Veritas®) hernia implants in a rat model.
• To compare implant performance against native abdominal wall tissue.

Main Methods:

• Experimental onlay hernia repair in rats using synthetic (BioA®) and biologic (porcine/bovine collagen) implants.
• Observation periods of 30 and 60 days.
• Assessment via macroscopic evaluation, biomechanical analysis, and histology (H&E, collagen, van Willebrand factor staining).

Main Results:

• Synthetic BioA® showed good integration and significantly enhanced tissue deflection and burst force resistance compared to native tissue, despite fragmentation at 60 days.
• Biologic matrices (Strattice®, Veritas®) exhibited inferior tissue integration and significant shrinkage, hindering biomechanical testing.
• Histology revealed poor fibroblast ingrowth in biologic samples, while BioA® demonstrated tight connection to tissue via collagen fibers.

Conclusions:

• Synthetic BioA® facilitates scar augmentation and improves burst force resistance through collagen remodeling, outperforming biologic matrices in integration and mechanical properties.
• Biologic implants showed limited tissue integration and significant shrinkage, compromising their effectiveness in hernia repair.