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Study Cites Problem with Tibial Component Used with Zimmer NexGen Knee

Feb 7, 2012 | Parker Waichman LLP

This week, a study will be presented at the American Academy of Orthopaedic Surgeons meeting highlighting a possible problem with the Zimmer NexGen Knee Replacement when it is used with a specific tibial component.  According to a report from Dow Jones Newswires, the problem caused failures in some Zimmer NexGen Knee Replacement patients who received that component.

The study was performed by researchers at the Mayo Clinic.  According to an abstract obtained by Dow Jones, a total of 1,373 people who Zimmer NexGen knee with the specific type of tibial component were included in the study.  All of them had undergone total knee replacement at a single center between 2000 and 2011.  Failures occurred in 3.9% of cases for various reasons.

According to the study, half of the failures seen were the result of the implant coming loose from the surrounding bone.  Of those cases, 80% were the result of isolated debonding, where the implant comes loose from cement.  A similar debonding problem wasn't seen among other implants used at the center.

While the Dow Jones Newswires report did not specify the tibial component cited in the study, a Zimmer spokesperson said that the component represents 1.2% of Zimmer's tibial sales.

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