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TKR study: Rotating platform not superior to fixed bearing inserts for surface damage
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Researchers who performed damage mapping and laser scanning of rotating platform and fixed bearing inserts for total knee arthroplasty found comparable tibiofemoral damage scores and thickness with the designs.
“The increased total damage score on the rotating platform, coupled with increased surface area damaged and the propensity for third-body debris, indicates no damage advantage to this mobile-bearing design,” Kristen Stoner, Meng, and colleagues wrote in their study abstract.
Stoner and colleagues studied 25 rotating platform and 17 fixed bearing inserts. They noted that although both designs had similar tibiofemoral damage scores, third-body debris scratching evidenced through mapping and 3-D scans resulted in higher scores on the inferior surface of the rotating platform designs.
The rotating platforms also showed greater damage as a function of surface area, according to the abstract.
“Dimensional changes on the inferior surfaces of the fixed bearing followed loading areas of the knee,” the researchers wrote. “However, no differences were seen in the thickness between fixed and rotating platform bearings.”
Disclosure: The authors have no relevant financial disclosures.
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