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Study shows increase of hip and knee replacements in the US
Date:4/14/2008

With the graying of Americas Baby Boomer generation, arthritis is a growing health concern. Traditionally associated with the elderly, this common joint disease currently afflicts over 20 million men and women in the United States. To aggravate matters, arthritis is also prevalent among the overweightwhich describes nearly 65 percent of our nations adult population. Fortunately, treating the pain and disability of arthritis has been revolutionized by surgical joint replacements of the hips and knees. Unfortunately, as hip and knee replacements have become a more popular option, the toll on Medicare, private insurers and hospitals has escalated. Despite its huge implications for the healthcare system, the projected impact of joint replacements has attracted scant study.

To assess and address this issue, Sunny Kim, PhD, a researcher with the Robert Stempel School of Public Health at Florida International University, started with one of the largest databases of hospital procedures available: the Nationwide Inpatient Sample (NIS). Using the latest revision of international procedure coding, Dr. Kim identified joint replacement cases throughout the US and analyzed increases in surgeries and costs between 1997 and 2004. The April 2008 issue of Arthritis Care & Research (www.interscience.wiley.com/journal/arthritis) presents hard-hitting numbers to back her conclusion: the burden resulting from hip/knee joint replacement is not only substantial but also increasing at a steep rate.

Among Dr. Kims significant, distressing findings:

  • In 2004, approximately 431,485 primary knee replacements were performeda 53 percent increase from the year 2000. 225,900 primary hip replacements were performed in the USmarking a 37 percent increase for the same period.

  • In 1997, about 60 of primary hip replacements and 69 percent of primary knee replacements were performed on individuals between the ages of 65 and 84 years. Although elderly patients remained the main recipients, the number of joint replacement surgeries among the middle-aged, patients between 45 and 64 years, increased excessively71 percent for hip replacements and 83 percent for knee replacementsin 2004.

  • Between 1997 and 2004, the hospital charges for joint replacements, both primary and revision surgeries, increased faster than the rate of inflation. While Medicare continued to provide the principal source of payment, compared with other sources of payment, the relative burden decreased. The burden on private insurance more than tripled in that 7-year spanfrom $1.1 billion to $3 billion for hip replacements and from $1.46 billion to $4.64 billion for knee replacements.

  • If current trends persist, nearly 600,000 hip replacements and 1.4 million knee replacements will be performed in the year 2015.

Reflecting on the rise in the numbers of joint replacements and in surgeries among younger patients, Dr. Kim raises decreased lack of tolerance for pain and increased acceptance of surgical safety, as well as the impact of obesity, as possible explanations. She also acknowledges the studys inability to track the rates and costs of a less-invasive surgery for hip and knee replacements, performed on an outpatient basis for selected patients.

Calling for the creation of a national joint replacement registry as one key step, Dr. Kim stresses the need for urgent attention to the problems that come with the territory of this popular, radical arthritis treatment. Public health education is critically important to reduce the proportion of people who are overweight as well as to manage arthritis at earlier stages, she notes. At the same time, given the steeply increasing trends of joint replacements and the expected number of joint revisions needed, the health care community should be prepared for this upcoming demand of surgical loads and its economic burden on government and private insurance systems.


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Contact: Sean Wagner
swagner@bos.blackwellpublishing.com
781-388-8550
Wiley-Blackwell
Source:Eurekalert

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