Impact of Morbid Obesity on Overnight Stay and Early Complications With Outpatient Arthroplasty

J Arthroplasty. 2020 Sep;35(9):2418-2422. doi: 10.1016/j.arth.2020.04.098. Epub 2020 May 11.


Background: The shift toward outpatient joint arthroplasty is rapidly growing, but concerns still remain on whether certain patients should be excluded from same-day discharge arthroplasty. The purpose of this study is to evaluate whether morbid obesity is a risk factor for perioperative complications after outpatient joint arthroplasty.

Methods: A retrospective review was performed from 2013 to 2017 of all outpatient primary total hip, total knee, partial knee, and revision hip and knee arthroplasties, yielding a cohort of 4863 patients (5988 arthroplasty procedures). Patients were separated and analyzed based on 2 groups: nonmorbidly obese (NMO) (BMI < 40 kg/m2) and morbidly obese (MO) (BMI ≥ 40 kg/m2). The NMO group consisted of 4870 arthroplasties and the MO group consisted of 1118 arthroplasties. Overnight stays, medical complications, and early perioperative complications were assessed between groups.

Results: Overnight stays occurred in 5.4% of NMO patients and 9.1% of MO patients (P < .001), with medical reasons for the overnight stay occurring in 3.2% of NMO and 6.4% of MO patients (P < .001). Respiratory/sleep apnea was the leading medical reason leading to overnight stay occurring in 4% of MO patients and 0.8% of NMO patients (P < .001). There was no significant difference between groups in direct facility transfers, emergency room visits/admissions, or medical complications within 90 days. Wound revisions, nonrevision surgery, or revisions within 90 days were significant between groups.

Conclusion: MO patients did not have an increased risk of 90-day medical complications, readmission, or revisions after outpatient arthroplasty. However, MO patients did have a significantly higher incidence of overnight stay.

Keywords: arthroplasty; complications; obese; outpatient; same day.

MeSH terms

  • Arthroplasty, Replacement, Hip* / adverse effects
  • Arthroplasty, Replacement, Knee* / adverse effects
  • Humans
  • Knee Joint / surgery
  • Obesity, Morbid* / complications
  • Obesity, Morbid* / surgery
  • Outpatients
  • Postoperative Complications / epidemiology
  • Postoperative Complications / etiology
  • Retrospective Studies