In the era of alternative payment models, providers and healthcare systems must understand the implications of potentially-modifiable risk factors on outcomes that affect overall cost. High BMI is associated with increased rates of complications (infection, loosening) in primary total hip arthroplasty (THA), but less is known about its impact on cost. In addition, the effects of low BMI on outcomes and cost are less-understood. This study sought to evaluate the relationship between BMI and length of stay (LOS), complications, thirty-day readmissions, inpatient cost, and need for post-acute services. A retrospective database analysis was conducted of 34,679 primary THAs performed between 2013–2017 in 29 hospitals in an integrated health system. Patient BMI was compared with operative time, LOS, complication rate, thirty-day readmission rate, inpatient cost, and post discharge disposition. Logistic regression was performed treating complications and readmission as outcomes and controlling for age.Introduction
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