# Bioabsorbable Hydrogel Coating for Infection Prevention in Fracture Fixation: A Retrospective Matched Case–Control Study

## TL;DR

A new bioabsorbable hydrogel coating reduced infections and wound complications in orthopedic surgery patients without using antibiotics.

## Contribution

Demonstrates the clinical effectiveness of an antibiotic-free hydrogel coating in reducing postoperative infections in fracture fixation.

## Key findings

- Infection incidence was significantly lower in the DAC® group (0.7%) compared to controls (5.3%).
- Wound complications were reduced in the DAC® group (1.3%) compared to controls (8.0%).
- Bone healing outcomes were comparable between the DAC® and control groups.

## Abstract

Background/Objectives: Hospital-acquired and fracture-related infections remain major complications in orthopedic trauma surgery, with significant clinical and socio-economic impact. Antibacterial implant surface coatings represent a promising strategy to reduce early postoperative bacterial adhesion and biofilm formation. Methods: This retrospective matched case–control study evaluated the clinical effectiveness of an antibiotic-free fast-resorbable hyaluronic acid and poly-d, l-lactide hydrogel (DAC®) applied intraoperatively to orthopedic implants. A total of 222 patients with comorbidities who underwent open reduction and internal fixation between May 2023 and April 2024 in two trauma centers were included: 99 patients received the DAC® coating and 123 served as controls with standard fixation. The primary endpoint was infection incidence within 6 months; secondary endpoints included wound complications, revision surgery, prolonged antibiotic therapy, and bone healing. Results: Postoperative infection incidence was significantly lower in the DAC® group compared with controls (0.7% vs. 5.3%; p = 0.0363). Wound complications were also reduced (1.3% vs. 8.0%; p = 0.028), and only one patient in the DAC® cohort required additional surgical interventions or prolonged antibiotic therapy. Bone healing outcomes were comparable between groups, with no delayed unions reported in the treated cohort. Conclusions: Even if larger prospective studies with longer follow-up are required to further confirm these findings and better define long-term safety and effectiveness, the routine intraoperative use of DAC® hydrogel without antibiotic loading appears to be a safe and promising strategy to reduce early postoperative infections and wound complications in orthopedic trauma patients with comorbidities.