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The 2D to 3D registration allowedto validate the accuracy of preoperative canal fill measurements with the actual postoperative implant seating: (A). preoperative planning of the humeral implant (purple) and segmentation of the humeral canal (orange), (B). registration of postOP X-rays, (C). correction of the implant position according to postOP position (blue) and (D). calculation of the true postOP canal fill ratio for comparison with the preOP ratio.
