No effect in primary stability after increasing interference fit in cementless TKA tibial components

Cementless total knee arthroplasty (TKA) implants rely on interference fit to achieve initial stability. However, the optimal is unknown. This study investigates effect of using different stability tibial TKA implants. Experiments were performed human cadaveric tibias a low 350 μm clinically established cementless porous-coated implant and high 700 μm. The Orthoload peak loads gait squat applied specimens with custom-made load applicator. Micromotions gaps opening/closing measured at bone-implant interface Digital Image Correlation (DIC) in 6 regions interest (ROIs). Two multilevel linear mixed-effect models created micromotions as dependent variables. results revealed no significant differences for between two fits (gait p = 0.755, 0.232), nor 0.474, 0.269). In contrast, found ROIs variables (p < 0.001), where more gap closing was seen posterior than anterior during both loading configurations. showed that increasing from did not influence