Lower Neighborhood Socioeconomic Status May Influence Medical Complications, Emergency Department Utilization, and Costs of Care After 1- to 2-Level Lumbar Fusion.

STUDY DESIGN: Retrospective Case-Control Study. OBJECTIVES: The objectives were to determine whether patients from poor social determinants of health, undergoing primary 1- to 2-level lumbar fusion, demonstrate differences in (1) medical complications, (2) emergency department (ED) utilizations, (3) readmission rates, and (4) costs of care. SUMMARY OF BACKGROUND DATA: Measures of socioeconomic disadvantage may enable improved targeting and prevention of potentially increased health care utilization. The Area Deprivation Index (ADI) is a validated index of 17 census-based markers of material deprivation and poverty. MATERIALS AND METHODS: A retrospective query of the 2010-2020 PearlDiver database was performed for primary 1- to 2-level lumbar fusions for degenerative lumbar pathology. High ADI (scale: 0-100) is associated with a greater disadvantage. Patients with high ADI (90%+) were 1:1 propensity score matched to controls (ADI: 0-89%) by age, sex, and Elixhauser Comorbidity Index. This yielded 34,442 patients, evenly matched between cohorts. Primary outcomes were to compare 90-day complications, ED utilizations, readmissions, and costs of care. Multivariable logistic regression models computed the odds ratios (OR) of ADI on complications, ED utilizations, and readmissions. P -values <0.05 were significant. RESULTS: Patients with a high ADI incurred higher rates and odds of developing respiratory failures (1.17% vs. 0.87%; OR: 1.35, P =0.005). Acute kidney injuries (2.61% vs. 2.29%; OR: 1.14, P =0.056), deep venous thromboses (0.19% vs. 0.17%; OR: 1.14, P =0.611), cerebrovascular accidents (1.29% vs. 1.31%; OR: 0.99, P =0.886), and total medical complications (23.35% vs. 22.93%; OR: 1.02, P =0.441) were similar between groups. High ADI patients experienced higher rates and odds of ED visits within 90 days (9.67% vs. 8.91%; OR: 1.10, P =0.014) and overall 90-day expenditures ($54,459 vs. $47,044; P <0.001). CONCLUSIONS: Socioeconomically disadvantaged patients have increased rates and odds of respiratory failure within 90 days. ED utilization within 90 days of surgery was higher in socioeconomically disadvantaged patients. Social determinants of health could be used to inform health care policy and improve postdischarge care. LEVEL OF EVIDENCE: Level III.