Table of Contents
Letter to the Editor
Volume 2012, Article ID 504189, 7 pages
Clinical Study

The Effects of Bariatric Surgery Weight Loss on Knee Pain in Patients with Osteoarthritis of the Knee

1Penn State College of Medicine, Penn State Hershey Medical Center, Penn State University, 500 University Drive, Hershey, PA 17033, USA
2Department of Surgery, Penn State Hershey Medical Center, 500 University Drive, MC H149, Hershey, PA 17033, USA
3Department of Orthopaedics and Rehabilitation, Penn State Hershey Medical Center, 30 Hope Drive, P.O. Box 859, Hershey, PA 17033, USA
4Department of Family and Community Medicine, Penn State Hershey Medical Center, 500 University Drive, H154, Hershey, PA 17033, USA
5Department of Health Evaluation Sciences, Penn State College of Medicine, Penn State Hershey Medical Center, 600 Centerview Drive, Suite 2200, P.O. Box 855, Hershey, PA 17033, USA
6Department of Radiology, Penn State Hershey Medical Center, 500 University Drive, H066, Hershey, PA 17033, USA

Received 31 July 2012; Revised 26 September 2012; Accepted 18 October 2012

Academic Editor: Jiri Vencovsky

Copyright © 2012 Christopher Edwards 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.


Studies have shown that osteoarthritis (OA) is highly associated with obesity, and individuals clinically defined as obese (BMI > 30.0 kg/m2) are four times more likely to have knee OA over the general population. The purpose of this research was to examine if isolated weight loss improved knee symptoms in patients with osteoarthritis. Adult patients ( ; age 18–70; BMI > 35 kg/m2) with clinical and radiographic evidence of knee OA participated in a one-year trial in which WOMAC and KOOS surveys were administered at a presurgery baseline and six and twelve months postsurgery. Statistical analysis was performed using Student's and Wilcoxon Signed Rank tests. Weight loss six and twelve months following bariatric surgery was statistically significant compared to presurgery measurements. All variables from both KOOS and WOMAC assessments were significantly improved when compared to baseline. Isolated weight loss occurring via bariatric surgery resulted in statistically significant improvement in patient’s knee arthritis symptoms at both six and twelve months. Further research will need to be done to determine if symptom relief continues over time, and if the benefits are also applicable to individuals with symptomatic knee arthritis that are overweight but not obese.