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Aladine A. Elsamadicy, Andrew B. Koo, Adam J. Kundishora, Fouad Chouairi, Megan Lee, Astrid C. Hengartner, Joaquin Camara-Quintana, Kristopher T. Kahle and Michael L. DiLuna

OBJECTIVE

Health policy changes have led to increased emphasis on value-based care to improve resource utilization and reduce inpatient hospital length of stay (LOS). Recently, LOS has become a major determinant of quality of care and resource utilization. For adolescent idiopathic scoliosis (AIS), the determinants of extended LOS after elective posterior spinal fusion (PSF) remain relatively unknown. In the present study, the authors investigated the impact of patient and hospital-level risk factors on extended LOS following elective PSF surgery (≥ 4 levels) for AIS.

METHODS

The Kids’ Inpatient Database (KID) was queried for the year 2012. Adolescent patients (age range 10–17 years) with AIS undergoing elective PSF (≥ 4 levels) were selected using the International Classification of Diseases, Ninth Revision, Clinical Modification coding system. Extended hospital LOS was defined as greater than the 75th percentile for the entire cohort (> 6 days), and patients were dichotomized as having normal LOS or extended LOS. Patient demographics, comorbidities, complications, LOS, discharge disposition, and total cost were recorded. A multivariate logistic regression model was used to determine the odds ratio for risk-adjusted LOS. The primary outcome was the degree to which patient comorbidities or postoperative complications correlated with extended LOS.

RESULTS

Comorbidities were overall significantly higher in the extended-LOS cohort than the normal-LOS cohort. Patients with extended LOS had a significantly greater proportion of blood transfusion (p < 0.001) and ≥ 9 vertebral levels fused (p < 0.001). The overall complication rates were greater in the extended-LOS cohort (20.3% [normal-LOS group] vs 43.5% [extended-LOS group]; p < 0.001). On average, the extended-LOS cohort incurred $18,916 more in total cost than the normal-LOS group ($54,697 ± $24,217 vs $73,613 ± $38,689, respectively; p < 0.001) and had more patients discharged to locations other than home (p < 0.001) than did patients in the normal-LOS cohort. On multivariate logistic regression, several risk factors were associated with extended LOS, including female sex, obesity, hypertension, fluid electrolyte disorder, paralysis, blood transfusion, ≥ 9 vertebrae fused, dural injury, and nerve cord injury. The odds ratio for extended LOS was 1.95 (95% CI 1.50–2.52) for patients with 1 complication and 5.43 (95% CI 3.35–8.71) for patients with > 1 complication.

CONCLUSIONS

The authors’ study using the KID demonstrates that patient comorbidities and intra- and postoperative complications all contribute to extended LOS after spinal fusion for AIS. Identifying multimodality interventions focused on reducing LOS, bettering patient outcomes, and lowering healthcare costs are necessary to improve the overall value of care for patients undergoing spinal fusion for AIS.