Morbid obesity in total hip arthroplasty: Redefining outcomes for operative time, length of stay, and readmission

Hanly, Richard J., Marvi, Salman K., Whitehouse, Sarah L., & Crawford, Ross W. (2016) Morbid obesity in total hip arthroplasty: Redefining outcomes for operative time, length of stay, and readmission. The Journal of Arthroplasty, 31(9), pp. 1949-1953.

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The incidence of obesity amongst patients presenting for elective Total Hip Arthroplasty (THA) has increased in the last decade and the relationship between obesity and the need for joint replacement has been demonstrated. This study evaluates the effects of morbid obesity on outcomes following primary THA by comparing short-term outcomes in THA between a morbidly obese (BMI ≥40) and a normal weight (BMI 18.5 - <25) cohort at our institution between January 2003 and December 2010.


Thirty-nine patients included in the morbidly obese group were compared with 186 in the normal weight group. Operative time, length of stay, complications, readmission and length of readmission were compared.


Operative time was increased in the morbidly obese group at 122 minutes compared with 100 minutes (p=0.002). Post-operatively there was an increased 30-day readmission rate related to surgery of 12.8% associated with BMI ≥40 compared with 2.7% (p= 0.005) as well as a 5.1 fold increase in surgery related readmitted bed days - 0.32 bed days per patient for normal weight compared with 1.64 per patient for the morbidly obese (p=0.026).


Morbidly obese patients present a technical challenge and likely this and the resultant complications are underestimated. More work needs to be performed in order to enable suitable allocation of resources.

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ID Code: 95276
Item Type: Journal Article
Refereed: Yes
Keywords: total hip arthroplasty; obesity; outcome; 30-day readmission; complications
DOI: 10.1016/j.arth.2016.02.023
ISSN: 0883-5403
Subjects: Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > CLINICAL SCIENCES (110300) > Orthopaedics (110314)
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > Institutes > Institute of Health and Biomedical Innovation
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2016 Elsevier Inc.
Deposited On: 03 May 2016 01:02
Last Modified: 29 Aug 2016 00:23

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