The Journal of Arthroplasty
Volume 25, Issue 8 , Pages 1250-1257.e1, December 2010

Body Mass Index and the Impact on Hospital Resource Use in Patients Undergoing Total Knee Arthroplasty

  • John A. Batsis, MD

      Affiliations

    • Section of General Internal Medicine, Department of Medicine, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire
    • Corresponding Author InformationReprint requests: John A. Batsis, MD, Section of General Internal Medicine, Department of Medicine, Dartmouth-Hitchcock Medical Center, Lebanon, NH 03756.
    • ,
  • James M. Naessens, ScD, MPH

      Affiliations

    • Division of Health Care Policy and Research, Mayo Clinic, Rochester, Minnesota
    • ,
  • Mark T. Keegan, MD

      Affiliations

    • Department of Anesthesia, Mayo Clinic, Rochester, Minnesota
    • ,
  • Paul M. Huddleston, MD

      Affiliations

    • Department of Orthopedic Surgery, Mayo Clinic, Rochester, Minnesota
    • ,
  • Amy E. Wagie, BS

      Affiliations

    • Division of Health Care Policy and Research, Mayo Clinic, Rochester, Minnesota
    • ,
  • Jeanne M. Huddleston, MD

      Affiliations

    • Division of Hospital Medicine, Department of Medicine, Mayo Clinic, Rochester, Minnesota
    • Division of Health Care Policy and Research, Mayo Clinic, Rochester, Minnesota

Received 27 March 2009; accepted 11 September 2009. published online 22 February 2010.

Abstract 

We identified all total knee arthroplasty patients between 1996 and 2004 and classified them by preoperative body mass index (BMI) as normal (BMI, 18.5-24.9 kg/m2), overweight (BMI, 25.0-29.9 kg/m2), obese (30-34.9 kg/m2), or morbidly obese (≥ 35.0 kg/m2). Of 5521 patients, 769 had a normal BMI, 1938 were overweight, 1539 were obese, and 1275 were morbidly obese. Adjusted length of stay was no different between normal (4.85 days), overweight (4.84 days), obese (4.86 days), or morbidly obese patients (4.93 days) (P = .30). Overall costs were similar among normal ($15 386), overweight ($15 430), obese ($15 646), or morbidly obese patients ($15 752) (P = .24). Postsurgical costs were no different among normal ($9860), overweight ($9889), obese ($10 063), or morbidly obese patients ($10 136) (P = .44). Our results suggest that increased BMI does not lead to increased hospital resource use for total knee arthroplasty.

Keywords: arthroplasty, body mass index, costs, length of stay, resource use

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 Supplementary material available at www.arthroplastyjournal.org.

 Funding: The study was made possible through an intramural grant from the Small Grants Program, Mayo Clinic Rochester.

PII: S0883-5403(09)00561-0

doi:10.1016/j.arth.2009.09.009

The Journal of Arthroplasty
Volume 25, Issue 8 , Pages 1250-1257.e1, December 2010

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