Figure 2.

Regions of interest for microCT analyses of drill holes and PMMA screws. 4 volumes of interest were defined. A) For the drill hole: a cylinder with a diameter of 1.1 mm and 2.5 mm in length. B and C) For the bone adjacent to the drill hole: a cylinder pipe with an outer diameter of 2.5 mm and inner diameter of 1.2 mm, extending from the cortex 2.5 mm into the marrow cavity. D and E) For measuring the bone formation surrounding the screw: a cylinder pipe with an outer diameter of 2.5 mm, inner diameter of 1.4 mm, extending from the cortex 1.0 mm into the marrow cavity. F) For measuring the tissue mineral density (TMD) surrounding the screw a longer cylinder, 1.8 mm in length, was defined including the cortical bone.”