Why Are There Concerns About the Zimmer NexGen CR-Flex Knee?

Two noted orthopedic surgeons, Richard Berger and Craig Della Valle, observed abnormally high rates of looseness in the implants after only two years of use.  Their observations showed that 36% of the Zimmer NexGen CR-flex Knee systems were loose after 2 years.  Additionally, almost 10% of those who had knee replacement surgery had to have the implants revised because of the loosenes in the knee replacement or because of unbearable pain.

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