Matlab 7.12.0 r2011 a

The nominal cutting planes were provided by the manufacturer, which were used to assess cutting errors. For this purpose, the nominal distal cutting planes were superimposed onto the distal face of preimplantation bone. As during surgery the distal cut is the first cutting plane, this surface was taken as the reference plane. Since the main press-fit is provided in the AP direction, deviations in the anterior and posterior regions were of main interest. Therefore, three regions of interest (ROIs) corresponding to the shape of anterior flange and posterior condyles were defined on the bone surface: anterior (ANT), the medial (PM) and lateral (PL) posterior condyle (Fig. 1C). Using a Matlab script (Matlab 7.12.0 (R2011a), Mathworks, MA, USA), the AP distance between each point from the cutting planes and the bony surfaces was calculated per ROI by finding two closest points from two surfaces and then extracting the AP distance between them. In this way, the maximum and average AP distance was obtained per ROI.