Since 2003, Zimmer Holdings has sold over 150,000 NexGen CR Flex knee implants, accounting for 2% of $1.76 billion total in 2009 sales. In terms of sales, the product has so far been very successful. On the other hand, two orthopedic surgeons who practice in Chicago at the Rush University Medical Center say the NexGen implant is dangerous and are seeking out a recall, gaining the attention of the United States Senate.
The physicians, Dr. Richard Berger and Dr. Craig Della Valle, claim that 36% of the NexGen knee implants, in their experience, loosen within two years of implantation and 9.3% require revision surgery due to mobility and pain caused by loosening. Zimmer responded that the devices were positioned incorrectly by the doctors
A report written by Barry Meier in the June 18, 2010 issue of the New York Times inspired Senator Charles E. Grassley to contact Zimmer CEO David C. Dvorak in a letter dated June 29, 2010. Grassley is a ranking member of the Senate Committee on Finance, which oversees Medicare and Medicaid, among other duties.
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