The outcome of total knee arthroplasty in obese patients

Jared R.H. Foran, Michael A. Mont, Gracia Etienne, Lynne C. Jones, David S. Hungerford

Research output: Contribution to journalArticlepeer-review

202 Scopus citations


Background: Evidence linking increased body weight to osteoarthritis of the knee and the high prevalence of obesity underscore the importance of defining the outcome of total knee arthroplasty in obese patients. The purpose of this study was to compare the clinical and radiographic results of total knee arthroplasties performed in obese patients with those of total knee arthroplasties performed in nonobese patients. Methods: Clinical and radiographic data on seventy-eight total knee arthroplasties in sixty-eight obese patients were compared with data on a matched group of nonobese patients. The analysis was also performed after stratification of the obese group for the degree of obesity. All patients had the same prosthesis. The clinical data that were analyzed included the Knee Society objective and functional scores, patellofemoral symptoms, activity level, and complications. Results: The percentage of knees with a Knee Society score of ≥80 points at an average of eighty months was 88% in the obese group, which was significantly lower than the 99% rate in the nonobese group at the same time. The morbidly obese subgroup had a significantly higher revision rate than did the nonobese group (p = 0.02). Conclusions: The results of the present study suggest that any degree of obesity, defined as a body mass index of ≥30, has a negative effect on the outcome of total knee replacement. Level of Evidence: Prognostic study, Level II-1 (retrospective study).

Original languageEnglish (US)
Pages (from-to)1609-1615
Number of pages7
JournalJournal of Bone and Joint Surgery - Series A
Issue number8
StatePublished - Aug 2004

ASJC Scopus subject areas

  • Surgery
  • Orthopedics and Sports Medicine


Dive into the research topics of 'The outcome of total knee arthroplasty in obese patients'. Together they form a unique fingerprint.

Cite this