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Multiplanar reconstruction image for evaluation of bone ongrowth on a cage surface. A sagittal plane was adjusted to the plane containing the cage frame that formed the lateral wall of each cage. A rectangular ROI (green) was placed on the upper and lower surface of each cage frame with 1-mm height on the sagittal plane (upper right) for calculation of HU values. HU = Hounsfield unit, ROI = regions of interest.
