Fig. 2 A-C.

Distal femoral volume was calculated from the distal femur model. (A) The most superior aspect of the lateral cartilage was located on the 3-D GRE fat-saturated images using the triplanar view in MIPAV (NIH, Bethesda, MD, USA). (B) The point on the bone denoting the superolateral cartilage was transferred to the 3-D femoral bone model in Geomagic (Geomagic Inc, Morrisville, NC, USA). The cut plane was defined in the imaging coordinate system. An oblique-axial plane was rotated about the AP axis such that it contained the two most distal points on the femur and was 5 mm superior to the most superolateral cartilage point. This 5-mm shift ensured that the entire posterior aspect of the femoral condyles was included. (C) The model was trimmed at the cutting plane and the volume calculated in Geomagic.