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  • Comparison of Short-Term Outcomes between Outpatient and Inpatient Anterior Lumbar Fusion

    Final Number:

    Yatindra H Patel BS; Nipun Sodhi BA; Hiba Anis MBBS; Assem A Sultan MD; Anton Khlopas MD; Jared M Newman MD; Michael Mont MD

    Study Design:

    Subject Category:

    Meeting: Congress of Neurological Surgeons 2018 Annual Meeting

    Introduction: Anterior lumbar interbody fusion (ALIF) has been increasingly performed as an outpatient procedure due to advances in minimally-invasive techniques. However, its safety profile in the outpatient setting has not been documented. Therefore, the purpose of this study was to compare the thirty-day rates of post-operative and post-discharge complications between outpatient and inpatient ALIF.

    Methods: Patients who underwent ALIF were identified from the 2011 – 2016 American College of Surgeons National Surgical Quality Improvement Program (ACS NSQIP) database. Outpatient status was defined as a length of stay equal to 0 days whereas inpatient status was defined as a length of stay greater than or equal to 1 day. Propensity-score matching (PSM) was used to account for patient characteristics with confounding potential, and the rates of postoperative and post-discharge complications were compared between cohorts via univariate analysis tests. Significance was assessed at p<0.05.

    Results: 85 outpatient cases (52.98 +/- 14.42 years, 40 females) and 6,587 inpatient (55.06 +/- 13.61 years, 3534 females) cases of ALIF were included in this study. Before PSM, outpatient cases had a lower rate of blood transfusions (1.2% vs 7.9%, p=0.014)) and a reduced relative risk of any complication (RR = 0.192, 95% CI: 0.049 – 0.755) postoperatively. After PSM, outpatient cases still had a lower rate of blood transfusions (1.2% vs 8.7%, p=0.012) and a reduced relative risk of any complication (RR = 0.189, 95% CI: 0.047 – 0.759) postoperatively. There were no significant differences in the rates of post-discharge complications between cohorts before or after PSM.

    Conclusions: When undertaking standalone ALIF, patients may be safely discharged on the same day of the procedure if excessive bleeding, commonly encountered as a result of vascular injury, can be avoided. Other short-term complications are similar to those of inpatient ALIF.

    Patient Care: Outpatient ALIF has the potential to save patients (and hospitals) time and money, and this study may help surgeons better understand its risk profile and determine whether it may be safe to offer their own patients.

    Learning Objectives: By way of this presentation, participants should be able to: 1) understand the short-term safety profile of outpatient ALIF compared to inpatient ALIF, 2) recognize the frequency with which different complications occur before or after discharge, and 3) appreciate the differences between patient populations and how they may affect outcomes.


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