Clinical and Injury-Related Factors Associated with In-Hospital Complications After Traumatic Spinal Injury: A 7-Year Retrospective Cohort Study.

Background/Objectives: Traumatic spinal injury (TSI) is associated with substantial morbidity, but factors contributing to in-hospital complications remain insufficiently defined. This study evaluated factors associated with in-hospital complications after TSI. Methods: We conducted a retrospective cohort study at a tertiary center (January 2018-May 2025). Among 5380 trauma patients screened by computed tomography, 413 admitted patients with TSI were included. The primary outcome was any documented in-hospital complication. Factors were assessed using multivariable logistic regression and reported as adjusted odds ratios (ORs) with 95% confidence intervals (CIs). Results: The median age was 28.0 years, 337 were male (81.6%), and four-wheel motorized vehicle accidents were the most common injury mechanism (57.1%). In-hospital complications occurred in 99 patients (24.0%). Pulmonary infection was most common (9.9%), followed by bloodstream infection (4.4%), urinary tract infection (3.9%), and surgical site infection (3.9%). Compared with patients without complications, those with complications had longer hospital stays, higher ICU admissions, longer ICU stays, and lower discharge home. In multivariate logistic regression, complications were associated with worse AIS grade (OR 1.690, 95% CI 1.241-2.302), inpatient physical therapy requirement (OR 4.385, 95% CI 2.494-7.711), greater number of associated non-spinal injuries (OR 1.729, 95% CI 1.463-2.042), and greater cervical vertebral injury burden (OR 1.479, 95% CI 1.061-2.062). Conclusions: Neurological severity, polytrauma burden, and cervical injury were independently associated with complications, supporting early risk stratification and multidisciplinary prevention in high-risk patients. Findings should be interpreted considering the retrospective single-center design, predominantly young male cohort, low spinal cord injury proportion, and limited post-discharge data.