Investigating immediate postoperative medical complication risks relative to in-hospital length of stay after total shoulder arthroplasty

BACKGROUND: The purpose of this study was to investigate the association between in-hospital length of stay (LOS) and postoperative complication rates within 30 days of total shoulder arthroplasty (TSA). METHODS: All patients who underwent either anatomic or reverse TSA between 2015 and 2019 were queried from the American College of Surgeons National Surgical Quality Improvement database. The study population was stratified into three cohorts as follows: LOS 0 (same-day discharge), LOS 1 (next-day discharge), and LOS 2–3 (LOS of 2-3 days). Patient demographics and comorbidities were compared between cohorts using bivariate analysis. Multivariate logistic regression analysis was conducted to investigate the relationship between LOS and postoperative complications. RESULTS: In comparison to the LOS 0 day cohort, LOS 2–3 day cohort had a greater likelihood of developing overall complication (OR, 2.598; P < .001), major complication (OR, 1.885; P < .001), minor complication (OR: 3.939; P < .001), respiratory complication (OR: 12.979; P = .011), postoperative anemia requiring transfusion (OR, 23.338; P < .001), non-home discharge (OR, 10.430; P < .001), and hospital readmission (OR, 1.700; P = .012). Similarly, in comparison to the LOS 1 cohort, LOS 2-3 cohort had a greater likelihood of developing overall complication (OR: 2.111; P < .001), major complication (OR, 1.423; P < .001), minor complication (OR, 3.626; P < .001), respiratory complication (OR, 2.057; P < .001), sepsis or septic shock (OR: 2.795; P = .008), urinary tract infection (OR, 1.524; P = .031), postoperative anemia requiring transfusion (OR, 10.792; P < .001), non-home discharge (OR: 10.179; P < .001), hospital readmission (OR, 1.395; P < .001), and return to the operating room (OR. 1.394; P = .014). There was no significant difference in the risk of developing postoperative complications between LOS 0 day and LOS 1 day cohort. On baseline, the LOS 1 and LOS 2-3 day cohort had a higher proportion of patients with the following demographics and comorbidities compared to LOS 0 day cohort: advanced age, higher body mass index, female gender, positive smoking status, insulin-dependent diabetes, noninsulin-dependent diabetes, dyspnea at rest and moderate exertion, partially dependent functional status, an American Society of Anesthesiologists classification of 3 or higher, a history of severe chronic obstructive pulmonary disease, a history of congestive heart failure, the use of hypertension medication, disseminated cancer, wound infection, the use of steroids, and a history of bleeding disorder. CONCLUSION: Patients who were discharged on the same and next day following TSA demonstrated a reduced probability of experiencing respiratory complications, infections, postoperative anemia requiring transfusion, non-home discharge, and readmission in comparison to those with a LOS of 2-3 days. There was no difference in postoperative complications between same and nextday discharged patients. Patients who underwent outpatient arthroplasty were healthier at baseline compared to those who underwent inpatient arthroplasty.