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Volume 2012 (2012), Article ID 185208, 6 pages
Research Article

The Influence of Obesity on Patient Reported Outcomes following Total Knee Replacement

1Rehabilitation Sciences, Queen Margaret University, Queen Margaret University Drive, Musselburgh, East Lothian, EH21 6UU, UK
2Orthopaedic Department, Royal Infirmary of Edinburgh, 51, Little France Crescent, Old Dalkeith Road, Edinburgh, Midlothian, EH16 4SA, UK

Received 31 May 2012; Accepted 12 September 2012

Academic Editor: Bruce M. Rothschild

Copyright © 2012 Vandana Ayyar et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


This study retrospectively analysed the effects of obesity as described by Body Mass Index (BMI) on patient reported outcomes following total knee replacement. Participants (105 females and 66 males) who had undergone surgery under the care of a single surgeon were included in the review and were grouped according to their preoperative BMI into nonobese (  kg/m2), ( ) obese (  kg/m2) ( ). Oxford Knee Score (OKS) and Short Form 12 scores (SF12) were taken preoperatively and 6 and 12 months after surgery to analyse differences between groups in the absolute scores as well as changes from before to after surgery. Preoperatively, the obese group had a significantly poorer OKS compared to non obese (44.7 versus 41.2, ). There were no statistically significant group effects on follow-up or change scores of the OKS and SF12. Correlations coefficients between BMI and follow-up and change scores were low ( ). There were no significant differences in the number of complications and revisions (local wound infection, 6.7% non obese, 11% obese, postoperative systemic complication, 8% non obese, 12% obese, revision, 4% nonobese, 3% obese). In conclusion, our findings indicate similar degrees of benefits from the surgery irrespective of patient BMI.