In total, 11 patients underwent 12 implants involving a Stryker Rejuvenate modular femoral stem design using a titanium-molybdenum-zirconium-iron alloy body (TMZF;Stryker) matched with a modular cobalt-chromium alloy neck.
The case reports show that at roughly 8 months on average, following their respective surgeries, all the patients presented with new onset pain. The results from tissue samples taken during their surgeries were quite disturbing, revealing “marked necrosis and dense lymphocytic infiltrates in the majority of cases.” The authors also reported, “Pale-green chromium phosphate particles, byproducts of corrosion, were observed in many of the samples.” And that finding is what the experts believe is possibly “the most compelling piece of evidence for the cause of failure, the presence of severe corrosion at the femoral neck-body junction and, to a lesser degree, at the articular femoral head-neck junction in all of the retrieved femoral components.”
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The phsyicians who wrote the paper are from the Departments of Orthopedic Surgery at 1) Rush University Medical Center, Chicago; 2) Northwestern University Feinberg School of Medicine, Chicago, and; 3) Indiana University School of Medicine, Indianapolis, Indiana.