Figure 38. The main architectural features of cancellous bone in the distal tibiotarsus of basal theropods.

These are illustrated here with a 3D geometric model of the observed architecture, mapped to the tibiotarsus of Daspletosaurus torosus (TMP 2001.036.0001; note that calcaneum was digitally sculpted based on other tyrannosaurid calcanei). (A–G) Seven progressive rotations of the tibia, in 30° increments, from proximally oblique medial to lateral views. Schematic inset in D illustrates generic cross-sectional pattern at the level indicated. (H–J) Three views of the astragalus and calcaneum, corresponding to those in (C–E), respectively. The various colours are used to help visualize the various tracts of cancellous bone more clearly.