Analysis of proximal bone margins in diabetic foot osteomyelitis by conventional culture, DNA sequencing and microscopy

Matthew Malone*, Blaine G. Fritz, Karen Vickery, Saskia Schwarzer, Varun Sharma, Nathan Biggs, Michael Radzieta, Thomas T. Jeffries, Hugh G. Dickson, Slade O. Jensen, Thomas Bjarnsholt

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

Multiple approaches were employed to detect pathogens from bone margins associated with Diabetic Foot Osteomyelitis (DFO). Intra-operative bone specimens of 14 consecutive subjects with suspected DFO were collected over a six-month study period from Liverpool Hospital. Infected bone and a proximal bone margins presumed to be ‘clean/non-infected’ were collected. Bone material was subjected to conventional culture, DNA sequencing and microscopy. In total, eight of 14 (57%) proximal bone margins had no growth by conventional culture but were identified in all proximal bone specimens by DNA sequencing. Proximal margins had lower median total microbial counts than infected specimens, but these differences were not statistically significant. Pathogens identified by sequencing in infected specimens were identified in proximal margins and the microbiomes were similar (ANOSIM = 0.02, p = 0.59). Using a combination of SEM and/or PNA-FISH, we visualized the presence of microorganisms in infected bone specimens and their corresponding proximal margins of seven patients (50%) with DFO. We identify that bacteria can still reside in what seems to be proximal ‘clean’ margins. The significance and implications of clinical outcomes requires further analysis from a larger sample size that incorporates differences in surgical and post-operative approaches, correlating any outcomes back to culture-sequence findings.

Original languageEnglish
Pages (from-to)660-670
Number of pages11
JournalAPMIS
Volume127
Issue number10
DOIs
Publication statusPublished - 1 Oct 2019

Keywords

  • 16S rRNA
  • diabetic foot
  • Osteomyelitis
  • surgical management

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