This Day On The Street
Continue to site right-arrow
ADVERTISEMENT
This account is pending registration confirmation. Please click on the link within the confirmation email previously sent you to complete registration.
Need a new registration confirmation email? Click here
TheStreet Open House

Obesity Alone May Not Affect Knee Replacement Outcome Or Increase Overall Complication Risk

Obese patients undergoing total knee replacement face longer hospital stays, higher related costs

CHICAGO, March 21, 2013 /PRNewswire-USNewswire/ -- Obesity alone may not diminish outcomes or increase the risk of complications in total knee replacement (TKR) patients, according to two research studies presented today at the 2013 Annual Meeting of the American Academy of Orthopaedic Surgeons (AAOS).  However, TKR replacement patients may face significantly longer hospital stays and related costs.

Total knee replacement in obese patients previously has been associated with increased post-operative complications and lower clinical function scores in multiple research studies.

In the study, " The Effect of Obesity on Direct Medical Costs in Total Knee Arthroplasty (TKA)" researchers reviewed the records of more than 8,000 patients who had undergone single, primary or revision TKR procedures between 2000 and 2008, collecting data on clinical and surgical characteristics, complications and hospital costs. Patients were classified into eight groups based on body mass index (BMI) and comorbidities (diabetes, hypertension, etc.).

Length of hospital stay and direct medical costs were lowest for patients with a BMI of 25-30kg/m 2.  Greater BMI was associated with significantly longer hospital stays after adjusting for age, sex, type of surgery and comorbidities. Every 5 unit increase in BMI beyond 30 kg/m 2 was associated with approximately $250-$300 in higher hospitalization costs for primary knee arthroplasty and $600-$650 higher hospitalization costs for revision procedures.

Although increasing BMI was not associated with an overall increase in complication risk during the 90-day window, there was a higher rate of infection in obese patients.

"The costs associated with obesity are believed to be largely those that come from managing comorbid medical conditions linked to obesity, such as diabetes," said lead study author Hilal Maradit-Kremers, MD, an associate professor of epidemiology at Mayo Clinic in Rochester, Minn.  In this study, "we attempted to tackle this problem by restricting the analysis to patients without comorbid conditions. Even in the absence of comorbidities, obesity was still associated with longer stays and higher hospital costs."

"The bottom line is that obesity is increasingly common among patients undergoing joint replacement and it creates a myriad of technical and medical challenges, and likely contributes to the financial burden of the surgery," said senior author David G. Lewallen, MD, an orthopaedic surgeon, also from Mayo Clinic.

In the related study, " Outcome of Total Knee Arthroplasty in Obese Patients," researchers in Singapore analyzed the outcomes of 301 TKA patients between December 2008 and April 2010 and grouped them according to BMI.

There was no difference in surgical time between obese and non-obese patients, although the obese patients had a longer hospital stay following TKR – 7.77 days versus 6.29 days for non-obese patients.

1 of 2

Select the service that is right for you!

COMPARE ALL SERVICES
Action Alerts PLUS
Try it NOW

Jim Cramer and Stephanie Link actively manage a real portfolio and reveal their money management tactics while giving advanced notice before every trade.

Product Features:
  • $2.5+ million portfolio
  • Large-cap and dividend focus
  • Intraday trade alerts from Cramer
  • Weekly roundups
TheStreet Quant Ratings
Try it NOW
Only $49.95/yr

Access the tool that DOMINATES the Russell 2000 and the S&P 500.

Product Features:
  • Buy, hold, or sell recommendations for over 4,300 stocks
  • Unlimited research reports on your favorite stocks
  • A custom stock screener
  • Upgrade/downgrade alerts
Stocks Under $10
Try it NOW

David Peltier, uncovers low dollar stocks with extraordinary upside potential that are flying under Wall Street's radar.

Product Features:
  • Model portfolio
  • Stocks trading below $10
  • Intraday trade alerts
  • Weekly roundups
Dividend Stock Advisor
Try it NOW

Jim Cramer's protege, David Peltier, identifies the best of breed dividend stocks that will pay a reliable AND significant income stream.

Product Features:
  • Diversified model portfolio of dividend stocks
  • Alerts when market news affect the portfolio
  • Bi-weekly updates with exact steps to take - BUY, HOLD, SELL
Real Money Pro
Try it NOW

All of Real Money, plus 15 more of Wall Street's sharpest minds delivering actionable trading ideas, a comprehensive look at the market, and fundamental and technical analysis.

Product Features:
  • Real Money + Doug Kass Plus 15 more Wall Street Pros
  • Intraday commentary & news
  • Ultra-actionable trading ideas
Options Profits
Try it NOW

Our options trading pros provide daily market commentary and over 100 monthly option trading ideas and strategies to help you become a well-seasoned trader.

Product Features:
  • 100+ monthly options trading ideas
  • Actionable options commentary & news
  • Real-time trading community
  • Options TV
To begin commenting right away, you can log in below using your Disqus, Facebook, Twitter, OpenID or Yahoo login credentials. Alternatively, you can post a comment as a "guest" just by entering an email address. Your use of the commenting tool is subject to multiple terms of service/use and privacy policies - see here for more details.
Submit an article to us!
DOW 16,677.90 +216.58 1.32%
S&P 500 1,950.82 +23.71 1.23%
NASDAQ 4,452.7920 +69.9450 1.60%

Brokerage Partners

Rates from Bankrate.com

  • Mortgage
  • Credit Cards
  • Auto

Free Newsletters from TheStreet

My Subscriptions:

After the Bell

Before the Bell

Booyah! Newsletter

Midday Bell

TheStreet Top 10 Stories

Winners & Losers

Register for Newsletters
Top Rated Stocks Top Rated Funds Top Rated ETFs