Severity of Illness Impacts Outcomes More than Admitting Service for Isolated Hip Fracture Patients

Isolated hip fractures (IHF) are common injuries in the elderly. Controversy exists about which hospital service is best suited to manage these patients. We hypothesize that baseline patient severity of illness (SOI) score drives patient outcomes, not the hospital service managing these patients.

Retrospective review of all IHF patients from 2014 to 2018 at our Level 1 trauma center. Basic demographics were obtained. Patients were divided into service line they were admitted; surgical vs non-surgical. Primary outcomes included hospital length of stay (HLOS), time to OR, time to VTE prophylaxis, complication rate (defined by the Trauma Quality Improvement Program), 30-day mortality, and readmissions. SOI score (which is DRG-based) was controlled to see if any differences in primary outcomes occurred between cohorts. Chi-square was used for categorical variables and regression analysis for continuous variables. Significance was p < 0.05.

A total of 366 total patients were analyzed with the same ISS. A total of 102 were admitted to a surgical service and 264 to a non-surgical service. Average overall age was 80 year, 66.9% were female, and 86% were Caucasian. There was no statistical difference between outcomes when comparing admitting services. Controlling for SOI score, there was no difference between admitting service for outcomes as well. SOI score was a significant predictor for increased HLOS and complication occurrence (p < 0.001) via regression analysis, with a 6.06-fold increase in complication rate from mild to moderate SOI score (p = 0.001).

There is no difference in outcomes based on admitting service and process measures. However, the SOI score is perhaps a better predictor of outcomes for isolated hip fracture patients.