The high failure and revision surgery rates involving the Zimmer Nexgen CR-Flex knee implants have been linked to a defective design that does not include any adhesive to keep the implant in place.  While Zimmer may have made the decision to eliminate the adhesive compound in order to facilitate greater knee movement for patients, the fact is that this defective design has translated into a higher risk of revision surgeries.

In 2010, a report by a Chicago orthopedist titled the High Failure Rate of a High-Flex Total Knee Arthroplasty Design confirmed to Zimmer knee device injury lawyers that the Nexgen CR-Flex knee implants were prone to failure because of a defective design.  More than 100 patients were involved in the study, and the researchers found that 8.3% of them underwent revision surgery after they suffered a femoral loosening of the device, leading to constant pain.  One percent of the subjects in the group were waiting for a revision surgery, and approximately 36% of the subjects in the group reported that the device was gradually becoming loose.

Ironically enough, the CR-Flex porous femoral implant was meant to be an improvement over an older implant model.  This model did not use adhesive cement to attach the device to the femur.  Some experts point to the lack of the adhesive as a possible reason for the problems with the device.

It is estimated that since surgeons began implanting the Nexgen CR-Flex knee implants, close to half a million people have required revision surgery.  The implant lasts about 15 years before a revision surgery is required.

Persons, who have been implanted with the Nexgen CR-Flex knee implants and have experienced dislocation, fracture, popping sounds, consistent joint pain, or difficulty walking or standing, must consult with a doctor immediately.