This study assessed the collective association of sociodemographic, preoperative comorbid and intraoperative factors with longer length of stay (LOS) following elective primary total knee arthroplasty. Sociodemographic characteristics examined on 2638 adult cases included age, race/ethnicity, gender and socioeconomic status (SES). Intraoperative factors included operating time and anesthesia type. The collective associations of lower SES, female gender, advanced age, non-Caucasian race/ethnicity and certain comorbidities do present a synergistically elevated risk for longer LOS. In a value-driven healthcare environment, these findings further warrant the need for policymakers and payers to consider sociodemographic status when allocating resources to hospitals serving such patients.
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