Do diabetes and older age make spinal surgery patients more likely to get a surgical site infection?
If you or a loved one is planning spinal surgery, it's natural to worry about infections. Research shows that having diabetes and being older are two key factors that raise the risk of a surgical site infection (SSI) after spine procedures. A large multicenter study found that diabetes nearly quadruples the odds of infection, and older age more than triples them 3. Other studies confirm these findings, showing that both factors are independent predictors of SSI 789.
What the research says
A 2024 multicenter cohort study of over 1,000 spinal surgery patients found that diabetes was linked to a nearly 4 times higher risk of SSI (odds ratio 3.698), and older age was linked to a more than 3 times higher risk (odds ratio 3.312) 3. These results were statistically significant, meaning they are unlikely to be due to chance.
Other studies support this. A 2020 study from the University of California, San Francisco, identified diabetes as a major risk factor for deep SSI after thoracolumbar spinal surgery 7. A 2006 study in Lebanon found that patients who developed SSI were older (average age 59 vs. 47) and had a 4 times higher odds of having diabetes 8. A 2024 retrospective study of over 1,200 patients who had open posterior lumbar fusion also found that both older age and diabetes were independent risk factors for deep SSI 9.
While these studies focus on spinal surgery, the pattern is consistent with findings in other surgical fields. For example, in hip replacement, diabetes and age are also known to increase infection risk, though specific numbers vary 1. The takeaway is clear: diabetes and older age are well-established risk factors for SSI after spinal surgery.
What to ask your doctor
- Given my age and diabetes status, what is my personal risk of surgical site infection?
- Are there any steps I can take before surgery to lower my infection risk, such as better blood sugar control?
- What signs of infection should I watch for after surgery, and when should I call you?
- Will I receive antibiotics before or after surgery to help prevent infection?
- How long is my surgery expected to last, since longer operations also increase infection risk?
This question is drawn from common patient questions about Orthopedics & Sports Medicine and answered using cited medical research. We do not provide individualized advice.