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Early aseptic loosening seen in short-keeled cemented tibial components
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German researchers have linked cemented, short-keeled tibial components to an increased rate of early aseptic loosening and recommend new indications for the component.
“We found an unacceptably high rate of tibial loosening, which did not appear to be related to patient factors such as [body mass index] BMI, sex or tibial size,” Christian Ries, MD, and colleagues wrote in the study.
Ries and colleagues compared 80 patients with short-keeled tibial components to a group of 80 patients who had standard tibial baseplates. They discovered that the mean sum of radiolucencies increased significantly in the short-keeled tibial tray group, according to the abstract.
At 1-year follow-up, the investigators found that no patients with standard tibial baseplate underwent revision compared to five patients in the short-keeled tibial tray group. Four of five failures were the result of the implant-cement interface, the researchers noted.
“Debonding of the roughened baseplate from the underlying cement mantle causes wear debris between the two surfaces,” the researchers wrote in the study. “The produced particulate metal and cement debris lead to rapid osteolysis and early failure.”
Disclosure: The authors have no relevant financial disclosures.
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