The presence of preoperative S. aureus colonization is a critical predictor for surgical outcomes in elective posterior spine surgery. A recent retrospective analysis of international trial data from 3311 participants explored how this colonization impacts postoperative infection rates. Researchers discovered that 35% of participants carried the pathogen in their nose or throat before surgery. Consequently, this carriage led to significantly higher odds of developing specific infections.

Link Between Preoperative S. aureus Colonization and Infection

The study results demonstrated a clear association between colonization and adverse outcomes. Specifically, patients with positive preoperative cultures faced a 1.7-fold increase in the odds of superficial surgical site infections (SSI). Furthermore, these individuals were 1.8 times more likely to develop bloodstream infections. Therefore, these findings underscore the importance of identifying carriers before they enter the operating room.

Identifying High-Risk Spine Surgery Patients

In addition to preoperative S. aureus colonization, other surgical variables played a role in infection risk. For instance, nasal colonization carried slightly higher odds of infection compared to throat colonization alone. The extent of the surgery also mattered significantly. Each additional vertebra fused increased the odds of infection by 20%. Moreover, longer surgical durations increased the infection rates.

Preoperative S. aureus Colonization: Screening and Management

Clinical guidelines often suggest decolonization protocols for known carriers. However, the effectiveness of these interventions depends on timely screening and patient compliance. By targeting high-risk patients, surgeons can potentially lower the incidence of both superficial SSIs and systemic bloodstream infections.

Is throat colonization as significant as nasal colonization for spine surgery?

While both are markers of carriage, the study found that nasal colonization carried slightly higher odds of postoperative infection compared to throat colonization alone.

Does the number of vertebrae fused affect the risk of infection?

Yes, the research indicated that a higher number of vertebrae fused increases the odds of postoperative S. aureus infection by approximately 20% per vertebra.

Disclaimer: This content is for informational and educational purposes only. It does not constitute medical advice or a professional relationship. Refer to the latest local and national guidelines for clinical practice.

References

1. Joshi AS et al. Staphylococcus aureus colonization before elective posterior spine surgery: is it associated with postoperative S. aureus infections? J Neurosurg Spine. 2026 Apr 17. doi: 10.3171/2025.12.SPINE25788. PMID: 41996715.


2. Bowers K, et al. Evaluating the Risk of Postoperative Infection and Complications in Lumbar Spine Surgery Patients with Preoperative Methicillin-resistant Staphylococcus aureus (MRSA) Colonization. Cureus. 2024.


3. Bratzler DW, et al. Clinical Practice Guidelines for Antimicrobial Prophylaxis in Surgery. Am J Health-Syst Pharm. 2013.