High body mass index (BMI) is associated with increased rates of complications in primary total hip arthroplasty (THA), but less is known about its impact on cost. The effects of low BMI on outcomes and cost are less understood. This study evaluated the relationship between BMI, inpatient costs, complications, readmissions, and utilization of post-acute services. A retrospective database analysis of 40,913 primary THAs performed between January 2013 and December 2017 in 29 hospitals was conducted. Operating time, length of stay (LOS), complication rate, 30-day readmission rate, inpatient cost, and utilization of post-acute services were measured and compared in relation to patient BMI.Aims
Methods
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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