Resistance to infection of five different materials in a rat body wall model

Christopher J. Medberry, Stephen Tottey, Hongbin Jiang, Scott A. Johnson, Stephen F. Badylak*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

Background: Infection occurs after approximately 1% of hernia repair procedures. The resistance to infection of the repair materials is therefore an important consideration. We evaluated the infection resistance of five different materials in a rat model of body wall repair, two of which, urinary bladder matrix (UBM-ECM) and Revive, were not previously evaluated in a controlled model of infection. Materials and Methods: An inoculum of 1 × 10 8 colony forming units of Staphylococcus aureus was delivered to the wound site following implantation of an autograft, UBM-ECM, Proceed, Prolene, or Revive. Infection was monitored by white blood cell counts, body temperature, bacterial culture, and histomorphologic analysis of the implant site. Results: Infection was shown in all groups through increased white blood cell count and body temperature. Animals with UBM-ECM returned to pre-surgery body temperature before all other groups. Substantial bacterial clearance was found in the autograft, UBM-ECM, and Prolene. Histomorphologic analysis showed evidence for persistent bacterial infection in Prolene, Proceed, and Revive 28 d after implantation, whereas the autograft and UBM-ECM appeared free of infection. The autograft showed a pyogranulomatous inflammatory reaction at 28 d while UBM-ECM was similar to uninfected controls. Conclusions: Superior infection resistance was shown by UBM-ECM compared with the other materials, which were substantially equivalent. Histomorphologic analysis clearly showed an increased ability to resist persistent bacterial infection for UBM-ECM. Our results suggest UBM-ECM may be useful as a repair material in areas of high risk for infection.

Original languageEnglish
Pages (from-to)38-44
Number of pages7
JournalJournal of Surgical Research
Volume173
Issue number1
DOIs
StatePublished - Mar 2012
Externally publishedYes

Keywords

  • extracellular matrix
  • hernia repair
  • infection resistance
  • surgical mesh

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