Photo of a hadrosaur neural spine (the part of the vertebra that sticks out and you can feel along your back) with a fracture zone crossing the shaft at the white arrow.
Cross-section (greatly enlarged) of callused bone showing a thin fringe of callus (uppermost left) over normal bone. The overlapping circles are osteons, cross-sections of blood vessel-tracks.
Cross-section (greatly enlarged) of callus in the process of being repaired (the lattice-like structure dominating the image). The open loops are precursors to the osteons that ultimately turn the repaired area into mature bone tissue.
Reconstruction of a "duck-billed" dinosaur, the type of dinosaur on which the study was based. The bones used in the study came from the ridge along the dinosaur's back.