How does having diabetes affect the risk of infection after spinal surgery?
If you have diabetes and are considering spinal surgery, it is important to know that diabetes raises the risk of surgical site infection (SSI). A large study of over 1,000 patients found that diabetes was an independent risk factor, increasing the odds of SSI by about 3.7 times 4. This is because high blood sugar can impair immune function and wound healing. However, with careful planning and blood sugar control, many people with diabetes undergo spinal surgery safely.
What the research says
A multicenter study of 1,049 spinal surgery patients identified diabetes as one of the strongest independent predictors of surgical site infection, with an odds ratio of 3.698 (95% CI: 1.854–7.377) 4. This means that, after accounting for other factors, patients with diabetes had nearly 4 times the odds of developing an infection compared to those without diabetes. Other significant factors included older age, low albumin levels, longer operative time, and greater blood loss 4.
Diabetes impairs wound healing through several mechanisms. A study of 687 surgical patients found that those with diabetes had 9.4-fold higher expression of PADI4, an enzyme involved in neutrophil extracellular trap (NET) formation, which is linked to delayed healing and higher infection rates 5. Genetic variations in PADI4 further increased risk, suggesting that some people with diabetes may be especially prone to wound complications 5.
Additionally, diabetes broadly disrupts immune function. A systematic review of 81 studies concluded that diabetes impairs both innate and adaptive immune responses, alters cytokine signaling, and reduces the body's ability to control infections 6. This immune dysregulation contributes to higher infection risk not only in spinal surgery but also in other surgical contexts, such as diabetic foot ulcers, where 50-60% of ulcers become infected 9.
What to ask your doctor
- What is my current HbA1c level, and should I aim for a specific target before surgery to lower infection risk?
- Will my diabetes medications need to be adjusted around the time of surgery?
- Are there any additional steps (like preoperative antibiotics or special wound care) that can reduce my infection risk?
- How will my blood sugar be monitored and managed during and after the surgery?
- What signs of infection should I watch for after surgery, and when should I call the doctor?
This question is drawn from common patient questions about this topic and answered using cited medical research. We do not provide individualized advice.