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Bland–Altman plots showing differences, by plane, between Certus system and IMU in the angular velocity change for the tibia (top row) and the femur (bottom row). The x-axis shows the angular velocities measured via the IMUs, whereas the y-axis shows the difference in angles for each plane (left, center, and right panels). The bias was negative in the transverse plane, positive in the frontal plane, and mixed in the sagittal plane for the two bones.
